bluuebunny/crossref_metadata_2025 huggingface dataset:
Visible and invisible effects of hurricanes on forest ecosystems: an international review
Authors: LUGO A. E.
Published: May 2008

Abstract  Hurricanes have visible and invisible effects on forests. The visible effects are dramatic, noticeable over the short‐term and relatively well documented in the literature. Invisible effects are less understood as they require well‐focused research both in the short‐ and long‐term time scales. This review of the literature on hurricane effects focuses on the Neotropics and the temperate zone of North America. The material is organized according to a heuristic model that distinguishes between immediate effects (0 to 3 years), immediate responses (0 to 20 years), trajectories of responses (0 to 100 years) and long‐term legacies (>100 years). It is suggested that the ecological role of hurricanes involves six principal effects: 1. they change the ecological space available to organisms; 2. they set organisms in motion; 3. they increase the heterogeneity of the landscape and the variability in ecosystem processes; 4. they rejuvenate the landscape and its ecosystems and redirect succession; 5. they shape forest structure, influence their species composition and diversity and regulate their function; and 6. they induce evolutionary change through natural selection and ecological creativity through self‐organization. A new approach to hurricane research will study hurricanes at the same scale at which they operate (i.e., across latitudes and longitudes and over disturbed and undisturbed landscapes). This research will require networks of observation platforms located along expected hurricane paths to facilitate forest structure and functioning observations across gradients of hurricane frequency and intensity. This research will also require use of remote sensing and automated wireless technology, hardened to survive hurricane‐strength winds and floods to assure real time measurements of the characteristics of hurricanes and ecosystem responses. No progress will be forthcoming in the understanding of hurricane effects if we do not learn to quantify objectively the energy dissipation of hurricanes on the full grid of affected forests as the hurricane passes over a landscape.
Landscape‐scale impacts of Cyclone Larry on the forests of northeast Australia, including comparisons with previous cyclones impacting the region between 1858 and 2006
Authors: TURTON STEPHEN M.
Published: May 2008

Abstract  Cyclone Larry (category 4) was the most severe cyclone to impact on the Wet Tropics bioregion since the devastating 1918 Innisfail cyclone. Based on an analysis of earlier cyclones impacting on this region over the period 1856–2006, it was determined that Larry was a ‘1 in 50 year’ event. This paper provides an overview of the landscape‐scale impacts of Larry on the forest ecosystems of the Wet Tropics region, based on low‐level helicopter surveys 2 weeks after the event. Cyclone Larry has been described as a ‘midget’ cyclone. Severe forest damage only extended about 30 km from the central track of the cyclone while moderate to severe damage extended some 50 km. Moderate to slight canopy disturbance was rarely identified more than 75 km from the centre of the cyclone's track. Beyond 75 km, forest damage was restricted to exposed areas of elevated terrain and in places exposed to strong lee (gravity) waves from the west. The ecological role of cyclones as important disturbance agents affecting the structure and function of forest ecosystems in the region is discussed, followed by an evaluation of likely effects of climate change on cyclone frequency and intensity.
Using field survey and remote sensing to assess rainforest canopy damage following Cyclone Larry
Authors: MOORE NICOLE J. , GILLIESON DAVID S.
Published: May 2008

Abstract  We surveyed canopy damage in upland and lowland rainforests following Cyclone Larry, which severely impacted the Innisfail and Atherton Tableland regions in March 2006. An existing damage‐classification was used as a basis for field assessment of rainforest canopy damage. Our field measurements showed that the damage categories were not clearly separated. Upland and lowland sites significantly differed in tree fall variables and measures of forest structure. There was a difference in recruitment of disturbance indicator species owing to varying levels of coarse woody debris at sites. Aspect was not found to be a significant variable in predicting damage owing to complexity of topography and the cyclone wind field. Analysis of remotely sensed imagery indicated that only high damage levels could be reliably discerned. Areas of very rapid vegetation growth in severely damaged sites are most easily detected with vegetation indices based on both near infrared and short wave infrared data. Numbers of fallen trees and their trunk orientations can be reliably quantified using high resolution (sub‐metre) colour aerial photography. This permits some estimation of whether the wind field was unidirectional or locally vortical.
Wood density predicts plant damage and vegetative recovery rates caused by cyclone disturbance in tropical rainforest tree species of North Queensland, Australia
Authors: CURRAN TIMOTHY J. , GERSBACH LAUREN N. , EDWARDS WILL , KROCKENBERGER ANDREW K.
Published: May 2008

Abstract  The ability to withstand disturbance (resistance) and the ability to recover biomass following disturbance (resilience) were investigated in Australian wet tropical rainforest tree species. These two attributes are expected to be negatively correlated, because investment of biomass in structural support (conferring resistance) results in trees exhibiting high wood densities and slow growth rates, and vice versa. We examined species’ responses to disturbance caused by a severe tropical cyclone to test this hypothesized trade‐off. We assessed cyclone damage in six species in three Mabi rainforest fragments on the Atherton Tablelands. Species differed in the proportion of individuals within four damage categories (minor damage, severe branch damage, snapped, uprooted). Resistance was positively related to wood density. We found a positive correlation between the proportion of trees experiencing minor damage only and wood density, supporting the hypothesized association between resistance and mechanical strength. Among the subset of trees in which stems snapped, rates of resprouting differed between species and were highest in low wood density species and lowest in species with highest wood density. Resilience, characterized as the ability to recover biomass following disturbance and estimated as growth rate standardized for stem diameter at breast height (g day−1 · mm−1), was negatively related to wood density. Thus, species with low wood densities were more likely to suffer stem and branch damage owing to cyclonic winds, but also demonstrated highest resprouting and fastest responses in terms of redeveloping biomass in the 8 months following disturbance. This suggests that a species’ position along the resistance–resilience spectrum can be predicted by mean wood density, which may allow managers to predict species’ responses to future cyclones. Our findings also provide mechanistic evidence for the ‘direct regeneration’ model of post‐cyclone succession, where response is characterized by resprouting and species composition is unchanged.
Plant functional traits explain interspecific differences in immediate cyclone damage to trees of an endangered rainforest community in north Queensland
Authors: CURRAN TIMOTHY J. , BROWN ROBYN L. , EDWARDS EMILEE , HOPKINS KRISTINA , KELLEY CATHERINE , MCCARTHY ELIZABETH , POUNDS ERIN , SOLAN RENATA , WOLF JAMI
Published: May 2008

Abstract  Cyclones cause profound immediate impacts on tropical rainforest trees, including defoliation, limb loss, snapping of stems and uprooting. Some studies have shown that plant functional traits such as tree size, buttress roots and wood density are correlated with these forms of cyclone damage. On 20 March 2006, Severe Tropical Cyclone Larry crossed the north Queensland coast and proceeded inland across the Atherton Tablelands, impacting the critically endangered Mabi Type 5b rainforest. We investigated the effects of Cyclone Larry on common tree species by categorizing damage to trees as uprooted, snapped, limbs damaged (light, moderate, severe) or upright and estimating levels of defoliation. Damage was then related to functional traits including tree size, presence of buttress roots, wood density, and leaf size and strength. Levels of damage differed between species. Tree size (diameter at breast height) and the presence of buttress roots were not related to damage levels. Wood density was significantly negatively correlated to proportion of trees with snapped stems and significantly positively correlated with the proportion of trees upright with no or light limb damage. Levels of defoliation were significantly related to leaf strength (specific leaf area – SLA) and to leaf width, but not other components of leaf size (area or length) or petiole length. Species with high wood density and low SLA (e.g. Argyrodendron spp.) were found to have high cyclone resistance, the ability to resist damage, while species with low wood density and high SLA (e.g. Dendrocnide photinophylla) exhibited low resistance. However, traits related to low resistance are also those linked to rapid growth and high cyclone resilience, the ability to recover from damage, so it is unlikely that the Mabi forest will experience long‐term changes in floristic composition following Cyclone Larry.
Do cyclones and forest fragmentation have synergistic effects? A before–after study of rainforest vegetation structure at multiple sites
Authors: CATTERALL CARLA P. , MCKENNA STEPHEN , KANOWSKI JOHN , PIPER SCOTT D.
Published: May 2008

Abstract  Ecological degradation within areas of remnant forest may be amplified if the effects of fragmentation interact with the effects of other environmental disturbances such as wind storms. We used before–after comparisons to assess the effects of Tropical Cyclone Larry on remnant and continuous rainforest in the Wet Tropics uplands of north‐eastern Australia. Vegetation structure was measured 3 years before the cyclone and 6 months afterwards, at eight continuous forest sites and eight remnants (6–37 ha), within 20 km of the cyclone's track. The cyclone caused extensive defoliation, felling and breakage of stems and branches (greatest among the trees >100 cm diameter which had around 50% stem loss), and increased litter and woody debris. Cyclone effects were strongly influenced by a site's spatial position (P = 0.005, 0.001 in multivariate analyses of overall damage). Maximum damage occurred 10–15 km south of the cyclone track, perhaps because of the additive effects of the west‐moving air at the southern eyewall combined with the cyclone's own rapid westward movement. Most fragments were south of the cyclone track, as a consequence of spatially selective deforestation practices, and therefore, showed greatest damage. However, once the effects of spatial position were considered, the independent differences in cyclone effects between fragments and continuous forest were lost (P = 0.23, 0.41 when north‐south distance was included as a covariate in analyses). The expected protection afforded by a continuous forest canopy seems to have disappeared in the face of extremely strong cyclonic winds and down‐draughts. Nevertheless, an interaction between fragmentation and disturbance may yet occur, during the period of post‐cyclone recovery, owing to the effects of landscape context on plant recruitment. For example, there was a higher diversity of exotic seedling germination in fragments, independent of the extent of cyclone damage.
Recruitment dynamics of invasive species in rainforest habitats following Cyclone Larry
Authors: MURPHY H. T. , METCALFE D. J. , BRADFORD M. G. , FORD A. F. , GALWAY K. E. , SYDES T. A. , WESTCOTT D. J.
Published: May 2008

Abstract  In tropical forests, natural disturbance creates opportunities for species to claim previously utilized space and resources and is considered an important mechanism in the maintenance of species diversity. However, ecologists have long recognized that disturbance also promotes exotic plant invasions. Cyclones cause extensive defoliation, loss of major branches and multiple tree falls, resulting in a significantly more open canopy and increased light and heat levels in the understorey. The widespread and massive disturbance caused by cyclones provides ideal conditions for rapid recruitment and spread of invasive species. The ecological roles of invasive species in rainforest habitats following such a severe disturbance are poorly understood. Severe category 4 Cyclone Larry crossed the North Queensland coast in March 2006 causing massive disturbance to rainforest habitats from Tully to Cairns and west to the Atherton Tablelands. We established 10 plots in an area extensively damaged by this cyclone near El Arish in North Queensland. On each plot nine 2 × 2 m quadrats were established with three quadrats per plot in each of the following treatments: (i) complete debris removal down to the soil layer, (ii) removal of coarse woody debris only, and (iii) uncleared. We monitored recruitment, growth and mortality of all native and invasive species in the 90 quadrats every 3 months since the cyclone. Here we present the recruitment dynamics of invasive species across the study area in relation to the level of disturbance, the type of quadrat treatment, and the diversity and abundance of the native recruiting flora over the first 12 months post‐cyclone. Our results suggest that invasive species will mostly comprise a transient component of the flora in the early stages of the successional response. However, some species may have longer‐term effects on the successional trajectory of the rainforest and future forest composition and structure.
Effects of Severe Tropical Cyclone Larry on rainforest vegetation and understorey microclimate near a road, powerline and stream
Authors: POHLMAN CATHERINE L. , GOOSEM MIRIAM , TURTON STEPHEN M.
Published: May 2008

Abstract  Severe Tropical Cyclone Larry damaged a large swathe of rainforest to the west of Innisfail in north‐eastern Queensland on 20 March 2006. Within the path of the most destructive core of the cyclone were sites previously established along human‐made (powerlines and highways) and natural (streams) linear canopy openings for a study of edge effects on adjacent rainforest plant communities and associated microclimates. Vegetation damage and understorey microclimate parameters were measured 6 months after the passage of Cyclone Larry and compared with results before the cyclone. We examined the spatial patterns of vegetation damage in relation to natural and artificial linear clearing edges and the vegetation structural factors influencing these patterns as well as resulting alterations to microclimate regimes experienced in the rainforest understorey. Vegetation damage was spatially patchy and not elevated near linear clearing edges relative to the forest interior and did not differ between edge types. Vegetation damage was influenced, albeit relatively weakly, by structural traits of individual trees and saplings, especially size (diameter at breast height, d.b.h.) and successional status: tree damage was greater in pioneer species and in larger trees, while sapling damage was greater in canopy tree species than in understorey tree or shrub species. Changes in the understorey microclimate mirrored the degree of damage to vegetation. Where vegetation damage appeared greater, the understorey microclimate was brighter, warmer, drier and windier than below less‐damaged areas of the forest canopy. Overall, understorey light availability, wind speed and the diurnal ranges of air temperature and vapour pressure deficit increased dramatically after Cyclone Larry, while pre‐cyclone edge gradients in light availability were lost and temperature and vapour pressure deficit gradients were reversed.
Cyclone damage sustained by riparian revegetation sites in the Tully‐Murray floodplain, Queensland, Australia
Authors: BRUCE CAROLINE , KROON FREDERIEKE , SYDES DAMON , FORD ANDREW
Published: May 2008

Abstract  Cyclones have been instrumental in shaping the structural and floristic composition of tropical forests, including tropical rainforests of north Queensland, Australia. The response of tropical riparian rehabilitation sites to cyclonic wind damage, however, is currently unknown. This lack of knowledge may severely hamper long‐term success of riparian restoration efforts, particularly in light of predictions that cyclones in north Queensland may become less frequent but more severe. In this study, we examined the extent, type and magnitude of damage inflicted on revegetation works in the Tully‐Murray floodplain of north Queensland by Severe Tropical Cyclone Larry. We compared wind damaged in 20 paired revegetated and associated rainforest remnant sites, using (i) gross community damage scores, (ii) mean weighted damage scores, and (iii) type of damage sustained by individual plants. Overall, wind damage due to Severe Tropical Cyclone Larry was surprisingly similar in revegetated and remnant sites. Both gross community damage scores and mean weighted damage scores did not differ between paired revegetated and remnant sites. In contrast, the type of damage sustained by individual plants was not independent of site, with a larger proportion in revegetated sites sustaining severe damage compared with remnant sites. This larger proportion of severely damaged individuals in revegetated sites was at least in part due to the significantly higher proportion of pioneers at these sites. The pioneer species Homalanthus novoguineensis was particularly susceptible to wind damage. The potential effects of spatial differences, such as consistent bias due to size, shape or exposure between the remnants and revegetated sites, on our results are discussed. In light of our results, we recommend that future revegetation sites include fewer pioneer species that are highly susceptible to wind damage, more pioneer species that are resistant to wind damage, and alteration of pioneer species distribution within planting matrices.
Landscape‐scale redistribution of a highly mobile threatened species, Pteropus conspicillatus (Chiroptera, Pteropodidae), in response to Tropical Cyclone Larry
Authors: SHILTON LOUISE A. , LATCH PETER J. , MCKEOWN ADAM , PERT PETINA , WESTCOTT DAVID A.
Published: May 2008

Abstract  Severe category 4 Tropical Cyclone Larry, which crossed north‐east Queensland on 20 March 2006, provided a unique opportunity to examine the short‐term impacts of a major disturbance event on the population of a highly mobile threatened species, Pteropus conspicillatus. As we had recorded, the species’ population distribution in colonial roosts (camps) across the region each month for almost 2 years prior to Cyclone Larry, we continued monthly surveying of P. conspicillatus camp‐sites for a year post‐cyclone. Here we report on how P. conspicillatus responded and redistributed immediately after the cyclone, and over the subsequent year. Post‐cyclone, P. conspicillatus typically roosted in smaller camps than pre‐cyclone, suggesting that these animals had largely dispersed to locate available blossoms and fruit. For 6 months after Cyclone Larry, up to 90% of the pre‐cyclone P. conspicillatus population (ca. 250 000) was unaccounted for across the region. Information provided by the general public assisted us in locating six small camps of P. conspicillatus at ‘new’ locations, but contributed little to increase our overall population estimate for the species at this time. After November 2006, the number of P. conspicillatus built up at located camp‐sites until a post‐cyclone peak of 209 000 at the end of the study in March 2007, comparable with the population estimates in March 2005 and 2006. There is no evidence that the cyclone caused significant direct mortality among P. conspicillatus, although there may yet be longer‐term and indirect effects on population size. We suggest that redistribution by P. conspicillatus makes sense ecologically in the face of major habitat disturbance and short‐ to long‐term food resource limitation, and is not unlike the response of other Australian mainland Pteropus species to seasonal changes in food availability.
The effect of Tropical Cyclone Larry on tooth‐billed bowerbird Scenopoeetes dentirostris court attendance and decoration
Authors: FREEMAN AMANDA N. D. , VINSON MAGDALENA F.
Published: May 2008

Abstract  The effect of Severe Tropical Cyclone Larry on tooth‐billed bowerbird court attendance and decoration was assessed for 32 courts located on the southern Atherton Tablelands. Numbers of active courts and the number of leaves on courts were compared with the two previous court attendance seasons. Compared with the 2004/2005 and 2005/2006 seasons, when court attendance was well established by mid‐September, tooth‐billed bowerbirds commenced court attendance late in the 2006/2007 season that followed Cyclone Larry. There were no courts active in mid‐September, and few were active in the first week of October. Twenty‐five percent fewer courts were active over the course of the 2006/2007 season than in the 2005/2006 season. For most of the 2006/2007 season, the average number of leaves on courts was significantly lower than in the previous two seasons. The 2006/2007 tooth‐billed bowerbird court attendance season appears to have been affected by direct disturbance to court sites and by the fruit shortage that followed the cyclone.
Response of soil bacterial community structure to successive perturbations of different types and intensities
Authors: Bressan Mélanie , Mougel Christophe , Dequiedt Samuel , Maron Pierre‐Alain , Lemanceau P , Ranjard Lionel
Published: May 2008

In soil, genetic structure modifications of indigenous bacterial community consecutively to a severe stress (mercury contamination) were delayed when the community was pre‐exposed to various minor perturbations (heat, copper and atrazine). Such minor perturbations induced transitory community structure modifications leading to an increase of community stability towards a severe mercury stress. These results illustrated well the short‐term pre‐adaptation process for bacterial community hypothesizing that community submitted to perturbations become more resistant to withstand another stress.
Enrichment and characterization of marine anammox bacteria associated with global nitrogen gas production
Authors: Van De Vossenberg Jack , Rattray Jayne E. , Geerts Wim , Kartal Boran , Van Niftrik Laura , Van Donselaar Elly G. , Sinninghe Damsté Jaap S. , Strous Marc , Jetten Mike S. M.
Published: May 2008

Microbiological investigation of anaerobic ammonium oxidizing (anammox) bacteria has until now been restricted to wastewater species. The present study describes the enrichment and characterization of two marine Scalindua species, the anammox genus that dominates almost all natural habitats investigated so far. The species were enriched from a marine sediment in the Gullmar Fjord (Sweden) using a medium based on Red Sea salt. Anammox cells comprised about 90% of the enrichment culture after 10 months. The enriched Scalindua bacteria displayed all typical features known for anammox bacteria, including turnover of hydrazine, the presence of ladderane lipids, and a compartmentalized cellular ultrastructure. The Scalindua species also showed a nitrate‐dependent use of formate, acetate and propionate, and performed a formate‐dependent reduction of nitrate, Fe(III) and Mn(IV). This versatile metabolism may be the basis for the global distribution and substantial contribution of the marine Scalindua anammox bacteria to the nitrogen loss from oxygen‐limited marine ecosystems.
Corporate governance and disclosures on the transition to International Financial Reporting Standards
Authors: Kent Pamela , Stewart Jenny
Published: May 2008

For reporting periods ending on or after 30 June 2004, Australian companies were required to disclose the expected impact of applying Australian equivalents of International Financial Reporting Standards effective from 1 January 2005. The objective of this paper is to examine the association between the level of disclosure and corporate governance quality. Using a sample of listed companies with 30 June balance dates, we find that the quantity of disclosure was positively related to some aspects of superior corporate governance, such as the frequency of board and audit committee meetings and the choice of auditor.
Why size counts: children's spatial reorientation in large and small enclosures
Authors: Learmonth Amy E. , Newcombe Nora S. , Sheridan Natalie , Jones Meredith
Published: May 2008

When mobile organisms are spatially disoriented, for instance by rapid repetitive movement, they must re‐establish orientation. Past research has shown that the geometry of enclosing spaces is consistently used for reorientation by a wide variety of species, but that non‐geometric features are not always used. Based on these findings, some investigators have postulated a species‐universal ‘geometric module’ that is transcended by the acquisition of spatial language at 6 years. This conclusion has been challenged, however, by findings that children as young as 18 months actually do use features to reorient in larger enclosures than those used in the original experiments. The reason for the room size effect is explored here in five experiments. Collectively, the data on age at which features are first used point to the importance of both restriction of movement in the small space and the fact that features are closer in the small space. In addition, success is seen at younger ages when the target object is adjacent to the feature. These results favor an adaptive combination model of spatial reorientation over a ‘module‐plus‐language’ view.
Cohesion as a constraint on object persistence in infancy
Authors: Cheries Erik W. , Mitroff Stephen R. , Wynn Karen , Scholl Brian J.
Published: May 2008

A critical challenge for visual perception is to represent objects as the same persisting individuals over time and motion. Across several areas of cognitive science, researchers have identified cohesion as among the most important theoretical principles of object persistence: An object must maintain a single bounded contour over time. Drawing inspiration from recent work in adult visual cognition, the present study tested the power of cohesion as a constraint as it operates early in development. In particular, we tested whether the most minimal cohesion violation – a single object splitting into two – would destroy infants’ ability to represent a quantity of objects over occlusion. In a forced‐choice crawling paradigm, 10‐ and 12‐month‐old infants witnessed crackers being sequentially placed into containers, and typically crawled toward the container with the greater cracker quantity. When one of the crackers was visibly split in half, however, infants failed to represent the relative quantities, despite controls for the overall quantities and the motions involved. This result helps to characterize the fidelity and specificity of cohesion as a fundamental principle of object persistence, suggesting that even the simplest possible cohesion violation can dramatically impair infants’ object representations and influence their overt behavior.
APPROXIMATING CARRIER‐BORNE EPIDEMICS
Authors: Gani J. , Swift R. J.
Published: May 2008

This paper considers approximations to carrier‐borne epidemic processes, including when the immigration of carriers or susceptibles is allowed. The partial differential equations for the probability generating functions of the approximating processes are derived, and their solutions are obtained.
Monetary Policy and Exchange Rate Interactions in a Small Open Economy
Authors: Bjørnland Hilde C.
Published: May 2008

The transmission mechanisms of monetary policy in a small open economy like Norway are analysed through structural VARs, with special emphasis on the interdependence between monetary policy and exchange rate movements. By imposing a long‐run neutrality restriction on the real exchange rate, thereby allowing the interest rate and the exchange rate to react simultaneously to news, I find considerable interdependence between monetary policy and the exchange rate. In particular, following a contractionary monetary policy shock, the real exchange rate immediately appreciates, after which it gradually depreciates back to the baseline. The results are found to be consistent with findings from an “event study”.
POLICY COMPROMISES: CORRUPTION AND REGULATION IN A DEMOCRACY
Authors: AIDT TOKE S. , DUTTA JAYASRI
Published: May 2008

This paper evaluates the extent of regulation in a democracy with corruption. Elected politicians can restrict entry of firms in exchange for bribes from entrepreneurs. Full liberalization implies free entry and allocative efficiency. Voters re‐elect politicians based on observed performance. We demonstrate that voters agree to tolerate corruption and inefficient regulation; that efficient policies can be promoted by productivity growth; that productivity growth reduces the cost of providing wage incentives; and that corruption is procyclical and economic policy is countercyclical in a corrupt democracy.
THE NON‐TRADED SECTOR, LOBBYING, AND THE CHOICE BETWEEN THE CUSTOMS UNION AND THE COMMON MARKET
Authors: SCHWELLNUS CYRILLE
Published: May 2008

This paper models immigration policy as the outcome of political competition between interest groups representing individuals employed in different sectors. In standard positive theory, restrictive immigration policy results from a low‐skilled median voter voting against predominantly low‐skilled immigration. In the present paper, in contrast, once trade policies are liberalized, restrictive immigration policy results from anti‐immigration lobbying by interest groups representing the non‐traded sectors. It is shown that this is in line with empirical regularities from recent episodes of restrictive immigration legislation in the European Union. It is further shown that if governments negotiate bilaterally over trade and migration policy regimes, the equilibrium regime depends (i) on the sequencing of the international negotiation process and (ii) on the set of available trade and migration policy regimes. In particular, the most comprehensive and most welfare‐beneficial type of liberalization may be rejected only because a less comprehensive type of liberalization is available.
Modeling population viability of captive elephants in Myanmar (Burma): implications for wild populations
Authors: Leimgruber P. , Senior B. , Uga  , Aung Myint , Songer M. A. , Mueller T. , Wemmer C. , Ballou J. D.
Published: May 2008

Captive Asian elephantsElephas maximus, used as work animals, constitute up to 22–30% of remaining Asian elephants. Myanmar has the largest captive population worldwide (∼6000), maintained at this level for over a century. We used published demographic data to assess the viability of this captive population. We tested how this population can be self‐sustained, how many elephants must be supplemented from the wild to maintain it, and what consequences live capture may have for Myanmar's wild population. Our results demonstrate that the current captive population is not self‐sustaining because mortality is too high and birth rates are too low. Our models also suggest ∼100 elephants year−1have been captured in the wild to supplement the captive population. Such supplementation cannot be supported by a wild population of fewer than 4000 elephants. Given the most recent expert estimate of ∼2000 wild elephants remaining in Myanmar, a harvest of 100 elephants year−1could result in extinction of the wild population in 31 years. Continued live capture threatens the survival of wild and captive populations and must stop. In addition, captive breeding should be increased. These measures are essential to slow the decline and extinction of all of Myanmar's elephants.
Fecal glucocorticoid metabolite analysis as an indicator of stress during translocation and acclimation in an endangered large mammal, the Grevy's zebra
Authors: Franceschini M. D. , Rubenstein D. I. , Low B. , Romero L. M.
Published: May 2008

Fecal glucocorticoid metabolite (FGM) analysis provides a non‐invasive method for studying the physiological response of wildlife to a variety of stressors and is a ground‐breaking monitoring technique in wildlife management and conservation. The conservation benefits of successful wildlife translocation restocking efforts are significant but understandably stressful for the animals being captured, removed from familiar habitat, held in captivity in many cases and subsequently released into an unfamiliar environment. It is imperative that we identify non‐invasive methods for evaluating stress in translocated animals, especially in endangered species. Twenty Grevy's zebra Equus grevyi were translocated to Meru National Park as part of a Kenya Wildlife Service re‐population initiative. FGMs were monitored from the time of capture, during captivity and post‐release as an indicator of the stress of translocation and acclimation to the new environment. FGMs from representative non‐translocated zebra were used as a further control. When held in pens at Meru Park 3–4 and 5–6 weeks after capture, the zebra had higher FGMs (25.1±1.2 and 23.4±1.3 ng g−1) than either at the time of capture (14.6±2.1 ng g−1) or non‐translocated controls (16.2±1.2 ng g−1). This suggests that the stress of captivity elevated FGMs. FGM concentrations returned to pre‐capture concentrations c. 11–18 weeks after the zebra were released into Meru Park. The return of FGM concentrations to baseline suggests successful acclimation to the new environment. This study supports the use of FGM analysis as an assessment technique in wildlife management projects involving the movement of endangered large mammals with application for monitoring stress in a wide array of conservation projects involving translocation, reintroduction and rehabilitation.
Assessing the mechanisms behind successful surrogates for biodiversity in conservation planning
Authors: Lawler J. J. , White D.
Published: May 2008

Limited by the availability of data, conservation planners must use surrogates for biodiversity when selecting conservation areas. Although several methods have been proposed for selecting surrogates, no clear set of species attributes have been described that allow for the efficienta prioriselection of surrogate groups. We used a database of 1449 species in two regions of the United States to (1) examine the consistency in the performance of simple taxonomic‐based surrogates of biodiversity and (2) test five hypotheses proposed to explain surrogate performance. First, we compared the ability of sites selected to protect members of seven surrogate groups to protect non‐surrogate species in the north‐western United States and in the Middle‐Atlantic region of the eastern United States. Then, in a separate analysis, we tested whether surrogate performance could be explained by (1) taxonomic diversity; (2) nested species distributions; (3) hotspots of biodiversity; (4) species range sizes; (5) environmental diversity. Our first analysis revealed little consistency in the performance of surrogates in the two different study regions. For example, butterflies provided protection for 76% of all other species in the north‐western United States but only 56% of all other species in the eastern United States. Our second analysis revealed only weak associations between species characteristics and surrogate performance. Furthermore, these associations proved inadequate for selecting successful surrogates across study regions. Overall, our results suggest that in lieu of searching for optimal surrogate groups, research efforts will be better spent by developing alternative methods for assessing conservation value in areas where data on species distributions are limited.
Microclimate of daytime den sites in a tropical possum: implications for the conservation of tropical arboreal marsupials
Authors: Isaac J. L. , De Gabriel J. L. , Goodman B. A.
Published: May 2008

Tree cavities are an important shelter site for a variety of vertebrate species, including birds, reptiles and mammals. Studies indicate that in most taxa favoured tree hollows are those in larger trees and higher from the ground, generally thought to be related to decreased predation risk and a more optimal thermal environment. However, neither of these ideas has been tested definitively. Here, we investigate the microclimate of daytime den sites in tree hollows of common brushtail possums in tropical northern Australia. We compare tree and hollow characteristics of dens known to be used by possums, and those not known to be used, to determine whether possums choose trees with microhabitats with a more favourable daytime microclimate. Possums chose to den in tree hollows which were on average 1.6 °C cooler during the day, and were more buffered from temperature extremes, than other potential den locations. Important factors explaining daytime temperatures between hollows included height of the hollow, entrance width and tree diameter. Tropical arboreal marsupials have been identified as being particularly vulnerable to climate change and there are calls to identify and preserve natural refuges, such as tree hollows, which could buffer them from extreme temperatures. Our results highlight the value of older, larger hollow‐bearing trees as refuges from extreme temperature, the importance of which may become critical for some temperature‐sensitive species under the combined effects of continuing habitat loss and climate change.
Setal morphology and cirral setation of thoracican barnacle cirri: adaptations and implications for thoracican evolution
Authors: Chan B. K. K. , Garm A. , Høeg J. T.
Published: May 2008

Thoracic cirripedes are sessile crustaceans that use six pairs of thoracic appendages (the cirri) to catch and handle food. We used scanning electron microscopy to examine the cirri, which include one to three pairs of maxillipeds in six species of thoracican barnacles, in search of correlations between cirral setation and feeding mode. The species studied comprise both pedunculate and sessile forms and represent a wide range of marine habitats as well as morphologies, viz., Ibla cumingi, Octolasmis warwickii, Capitulum mitella, Pollicipes polymerus, Tetraclita japonica japonica and Megabalanus volcano. Of the pedunculates, I. cumingi has the least complex setation pattern consisting of only serrulate types. This is consistent with its very simplified feeding mode and an apparent inability to discriminate between food items. Octolasmis warwickii is slightly more modified, while both P. polymerus and C. mitella have a more diversified setation. The balanomorphan species exhibit by far the most complex cirral setation. This is consistent with the several types of suspension feeding seen in these species, their ability to identify and sort captured food items and even to perform microfiltration in the mantle cavity using the setae on their three pairs of maxillipeds. Our results indicate that in thoracican barnacles, adaptations in feeding behaviour are associated with changes in the setation pattern of the cirri. In addition, the setal types and their distribution on the cirri are potential new characters in future morphology‐based analyses of the phylogeny of the Cirripedia Thoracica.
‘What's so special about family business?’ An exploratory study of UK and Irish consumer experiences of family businesses
Authors: Carrigan Marylyn , Buckley Joan
Published: May 2008

While family‐owned businesses are considered to have specific advantages in customer relationships, limited research has been conducted into how these abilities are developed or understood by the public. Consumers may indeed perceive family businesses differently from non‐family businesses, but this aspect has received scant attention within the literature. This paper sets out exploratory work designed to gain an understanding of Irish and UK consumer perceptions of family‐owned businesses, within both urban and rural communities. The study provides insight into the meaning of ‘familiness’ in consumers' minds when linked to family businesses, and explores the relationships and experiences that respondents have of family firms. Emerging issues include family business heritage, community bonds and social stewardship, consumer loyalty and generational transfer, distinction, choice and retail heterogeneity. The findings of this exploratory study suggest that researchers should be paying more attention to the positive aspects of family businesses within communities, and concludes with suggestions for future research to further extend this area of study.
Pedagogy for interprofessional education – what do we know and how can we evaluate it?
Authors: Payler Jane , Meyer Edgar , Humphris Debra
Published: May 2008

Locating this paper in the wider context of evaluations of interprofessional education (IPE), this review explores the knowledge base of the pedagogic processes for interprofessional education. The article concentrates on evidence for professionals in health, social care and education, the challenges involved in IPE and the challenges involved in evaluating IPE. Although IPE is widely discussed, detailed descriptions of the underlying pedagogy are scarce. The paper aims to provide a more detailed account of the approaches to learning and teaching in IPE. A literature review was undertaken to collate information on approaches to IPE, concentrating primarily on identifying descriptions of pedagogical features for pre‐ and post‐registration training and continuing professional development. The review identifies a number of pedagogical models and educational processes underpinning IPE. Although the findings indicate that social‐constructivist approaches, small group working and problem‐based learning are often referred to, evidence of pedagogical models used in IPE and ways of developing evidence of their effectiveness and usefulness are still limited. Based on the discussion of some challenges that face IPE in general and the evaluation of IPE in particular, the authors propose the need for a theoretical framework that conceptualizes learning by taking into account the wider context of learning and the pedagogy that is employed during IPE. Reference is made to a framework which would respond to evidence in the literature that evaluations of IPE need to take into consideration different, complimentary sources of data that go beyond traditional, often positivist evaluations.
Cytosine arabinoside in addition to VCAA‐based protocols for the treatment of canine lymphoma with bone marrow involvement: does it make the difference?
Authors: Marconato L. , Bonfanti U. , Stefanello D. , Lorenzo M. R. , Romanelli G. , Comazzi S. , Zini E.
Published: May 2008

Cytosine arabinoside (ara‐C) is a component of many protocols for the treatment of acute leukaemia and non‐Hodgkin lymphomas in humans. The aim of the study was to prospectively evaluate the efficacy of ara‐C in a myeloablative regimen in a cohort of canine lymphomas with bone marrow involvement. Seventeen dogs were enrolled. Eight were treated with a VCAA‐based protocol (Group 1) and nine with the same regimen added with ara‐C (Group 2). Ara‐C was administered on a 5‐day schedule as an i.v. continuous infusion at the dose of 150 mg m−2per day for five consecutive days. During treatment complete remission (CR) was achieved in two dogs in Group 1 and in eight dogs in Group 2. CR rate was significantly higher in Group 2 (P < 0.01). Median survival was 72.5 days (range 6–174) in Group 1 and 243 days (range 73–635) in Group 2. Survival was significantly longer in Group 2 (P < 0.001). Both protocols were well tolerated, with a low incidence of adverse events. Ara‐C added to a VCAA‐based protocol appears to be safe and beneficial in dogs with stage V lymphoma. Incorporation of the nucleoside analogue might be crucial for the development of future therapeutic strategies in dogs.
Adjuvant gemcitabine after surgical removal of aggressive malignant mammary tumours in dogs
Authors: Marconato L. , Lorenzo R. M. , Abramo F. , Ratto A. , Zini E.
Published: May 2008

Canine mammary tumours are generally treated with surgery alone, despite the fact that 50% of them are malignant and many will eventually lead to recurrence or metastases. A prospective clinical trial in which dogs with aggressive mammary carcinoma of clinical stages IV and V were treated with surgical excision (n = 9) or with surgery and adjuvant weekly gemcitabine (n = 10) for at least four cycles was conducted. Gemcitabine was given as an intravenous infusion at the dose of 800 mg m−2. Aim of the study was to explore potential beneficial effects of gemcitabine on time to local recurrence (TTR), time to distant metastases (TTM) and overall survival (OS) in canine patients with operated mammary tumours bearing high risk for locoregional failure and distant metastases. Also, factors associated with OS, including neutering status, body weight, age, clinical stage at presentation, tumour size, histological grade and, in dogs receiving chemotherapy, the number of gemcitabine treatments, were investigated. Finally, acute toxicities related to chemotherapy and quality of life were assessed in dogs receiving gemcitabine. Dogs treated with surgery alone or surgery followed by gemcitabine had no difference in TTR, TTM or OS (P > 0.05). In the group of dogs receiving adjuvant chemotherapy, the number of gemcitabine treatments was positively correlated with OS (P = 0.017). Gemcitabine treatment was well tolerated, with no dogs experiencing clinically relevant haematological or gastrointestinal toxicity. Despite being safe at the present dose, gemcitabine chemotherapy as an adjunct treatment to surgical excision may not be recommended in dogs with aggressive mammary carcinoma.
Description of clinical and pathological findings, treatment and outcome of feline large granular lymphocyte lymphoma (1996–2004)*
Authors: Krick E. L. , Little L. , Patel R. , Shofer F. S. , Sorenmo K. , Clifford C. A. , Baez J. L.
Published: May 2008

Feline large granular lymphocyte (LGL) lymphoma is an uncommon, morphologically distinct variant of feline lymphoma. Limited information exists in the literature regarding pathological and immunohistochemical descriptions, clinical findings, treatment and survival times. The purpose of this study was to describe clinical features, treatment and outcome in feline LGL lymphoma. Medical records of 45 cats with LGL lymphoma were retrospectively evaluated. Decreased appetite/anorexia, weight loss, lethargy and vomiting were the most commonly reported clinical signs. All cats tested for feline leukaemia virus and feline immunodeficiency virus infection were negative. The mesenteric lymph nodes and small intestine were the most commonly affected organs. One complete response and six partial responses were noted in the 23 cats that received chemotherapy as their initial treatment. Median survival time for cats that were treated was 57 days. Based on these results, feline LGL lymphoma appears to be minimally responsive to chemotherapy and is associated with a grave prognosis.
Dose‐escalating vinblastine for the treatment of canine mast cell tumour
Authors: Vickery K. R. , Wilson H. , Vail D. M. , Thamm D. H.
Published: May 2008

The purpose of this study was to evaluate the short‐term adverse events (AEs) in dogs with mast cell tumours (MCT) receiving prednisone and dose‐escalating vinblastine (VBL). Twenty‐four dogs were treated with intravenous VBL starting at 2 mg m−2 and then escalating in weekly increments to 2.33, 2.67 and 3 mg m−2. AEs were graded using a standardized scoring system. No dogs receiving 2 or 2.33 mg m−2 experienced grade 3 or 4 AEs. Among the dogs, 9.5 and 5.9% had grade 3 or 4 AEs at dosages of 2.67 and 3 mg m−2, respectively. Serious AEs included neutropaenia (n = 3) and vomiting (n = 1), only one of which required hospitalization. These data indicate that VBL chemotherapy may be safe to administer at higher than the traditional 2 mg m−2 dosage for dogs with MCT. Randomized prospective trials are necessary to establish whether dose escalation will translate into improved response rates when compared with the standard 2 mg m−2 dosage.