bluuebunny/crossref_metadata_2025 huggingface dataset:
Spatial distribution by Canistropsis microps (E. Morren ex Mez) Leme (Bromeliaceae: Bromelioideae) in the Atlantic rain forest in Ilha Grande, Southeastern Brazil
Authors: Nunes-Freitas AF. , Rocha CFD.
Published: December 2007

Canistropsis microps (Bromeliaceae: Bromelioideae) is an endemic species of Atlantic rain forest areas in Rio de Janeiro State, which are very abundant in not very disturbed forests in Ilha Grande, on the southern coast of the State. In this study, we analyzed the vertical and horizontal distribution patterns of the species in an area of rain forest with little evidence of disturbance at Vila Dois Rios, Ilha Grande, relating the patterns to sunlight in the microhabitat. We also identified the types of substrate used by the species and the rate of asexual reproduction. Canistropsis microps had high densities (estimated at 84,425 rosettes/ha), and has an aggregated distribution (Id = 2.86). About 80% of the rosettes were generated by clonal growth, whereas less than 20% were produced from seedlings. Most of the rosettes were found on straight tree trunks (DBH > 50 cm). There was a significant inverse correlation between the incidence of sunlight in the habitat and the abundance of individuals. Rosettes were found up to a maximum height of 9.5 m, but most occured between 1.5 and 5.5 m, where light varied from 25 to 50 µmol.s-1.m-2. We conclude that vertical and horizontal distribution patterns in C. microps may be partially explained by the occurrence of appropriate substrate, an intensity of sunlight favorable to the development of the species and to a high rate of vegetative reproduction.
Total-Hg and organic-Hg in Cephalopholis fulva (Linnaeus, 1758) from inshore and offshore waters of NE Brazil
Authors: Lacerda LD. , Santos JA. , Campos RC. , Gonçalves RA. , Salles R.
Published: December 2007

To investigate whether source proximity or bioavailability is the major factor controlling both Hg concentration and Hg speciation in marine fishes, total- and organic-Hg content in muscle and liver tissues from different populations of Cephalopholis fulva (piraúna) from inshore and offshore waters of the Brazilian northeastern coast were analyzed. Average total-Hg in muscle (104 ng.g-1 w.w.) and liver (2,865 ng.g-1 w.w.) tissues, as well as organic-Hg concentrations in muscle (169 ng.g-1 w.w.) and liver (1,038 ng.g-1 w.w.), were much higher in the offshore population of C. fulva than in the inshore ones. In the inshore population total-Hg and organic-Hg average concentrations in muscle tissue were similar and reached only 49 ng.g-1 w.w., while in liver they reached 412 ng.g-1 w.w. for total-Hg and 180 ng.g-1 w.w., for organic-Hg. Concentrations of both Hg species in the two populations were higher in liver than in muscle. The average percentage contribution of organic-Hg to the total Hg content was higher in muscle (98-100%) than in liver (42-53%), but similar between the two populations. Total-Hg and organic-Hg concentrations in muscle and liver from the offshore population showed significant (P < 0.05) positive correlation with fish length. However, in the inshore population only the total-Hg and organic-Hg in muscle tissues correlate significantly with fish size. Although the coastal environments are enriched in total Hg relative to open waters, the significant higher Hg concentrations in the offshore population of C. fulva and the significant correlation found between organic-Hg in liver with fish size suggest higher bioavailability of Hg in offshore waters relative to inshore ones.
Macroinvertebrate fauna associated with Pistia stratiotes and Nymphoides indica in subtropical lakes (south Brazil)
Authors: Albertoni EF. , Prellvitz LJ. , Palma-Silva C.
Published: December 2007

This study was carried out at the Biguás and Polegar lakes, both small environments but at different successional stages. The main objective was to characterize the macroinvertebrate community associated to the aquatic macrophyte stand in each lake in order for this community, the environmental conditions and their water quality to interact. The samples were taken in 2003. The abiotic variables of N and P totals, the temperature, electrical conductivity, pH and dissolved oxygen, as well as the determined clorophyll a concentration were measured. Macroinvertebrates were sampled with a 500 µ mesh size net, separated under a stereomicroscope and identified at the lowest possible taxonomic level, and their densities were shown as the number of individuals per 100 g of macrophyte dry weight. The Shannon-Wiener Diversity Index (H'), Pielou evenness (J), frequency of occurrence, abundance and taxa richness were calculated for each invertebrate community. The Lago dos Biguás is undergoing a process of eutrophication and during the study presented a large Pistia stratiotes stand. The Lago Polegar is oligotrophic and had only a small Nymphoides indica bankwe. The macrophyte associated invertebrate communities in each lake were considered significantly different (p < 0.05). Sixty seven taxa were found for the Lago dos Biguás and 32 for the Lago Polegar. For both lakes, most of the taxa were considered rare, with a low dominance in a few months. The taxa with highest densities at Lago dos Biguás were Chironomidae, Daphniidae and Cyclopidae, and Oligochaeta, Chironomidae and Coenagrionidae for Lago Polegar.
Blood parasites, total plasma protein and packed cell volume of small wild mammals trapped in three mountain ranges of the Atlantic Forest in Southeastern Brazil
Authors: Silva MAML. , Ronconi A. , Cordeiro N. , Bossi DEP. , Bergallo HG. , Costa MCC. , Balieiro JCC. , Varzim FLSB.
Published: December 2007

A study of blood parasites in small wild non-flying mammals was undertaken in three areas of the Atlantic Forest in Southeastern Brazil: Serra de Itatiaia, RJ, Serra da Bocaina, SP and Serra da Fartura, SP, from June 1999 to May 2001. A total of 450 animals (15 species) were captured in traps and it was observed in 15.5% of the blood smears the presence of Haemobartonella sp. and Babesia sp. in red blood cells. There was no statistically significant difference between parasited and non-parasited specimens regarding total plasma protein, packed cell volume and body weight, which strongly suggests that these specimens might be parasite reservoirs.
Clinic feature of the mesial temporal sclerosis in children
Authors: Brandão Eliana Maria Domingues , Manreza Maria Luiza Giraldes de
Published: December 2007

INTRODUCTION: Mesial temporal sclerosis is not a frequent cause of refractory epilepsy in children, and the its start age is uncertain. OBJECTIVE: To understand the clinic feature of children with mesial temporal sclerosis diagnosis. MATERIAL AND METHODS: It was done a literature review about this pathology in children, and it has been found a group of 4 articles that allow a general view about mesial temporal sclerosis in children and other group of 7 articles (case reports or small series) in which mesial temporal sclerosis was diagnosed until five years old. RESULTS: It was evaluated in the first group, febrile seizure that was the most frequent antecedent followed by a status epilepticus and the semiology of the seizures was characterized by oroalimentary automatism, gestural automatism, stunted movement and motor phenomenon.The group of children with mesial temporal sclerosis until five years old stood out due to the high incidence of status epilepticus (84,6%), by the number of children with altered neuropsycomotor development (46%), and by lesion in most of bilateral cases (53,8%) , suggesting that the bilateral form of the mesial temporal sclerosis might be a distinct pathology, and not necessarily the progression of a unilateral beginning picture. Another important thing to stand out in this group is the documentation by MR in edema in hippocampus after a status epilepticus and posterior atrophy of this structure. CONCLUSION: mesial temporal sclerosis can to appear still in early life and in any cases can to present an evolutional character and dependent from a previous aggression to the hippocampus.
Neurogênese no cérebro adulto e na condição epiléptica
Authors: Kandratavicius Ludmyla , Monteiro Mariana Raquel , Romcy-Pereira Rodrigo N. , Arisi Gabriel Maisonave , Cairasco Norberto Garcia , Leite João Pereira
Published: December 2007

INTRODUÇÃO: Relatos sobre a possibilidade de neurogênese no cérebro de mamíferos adultos existem desde o início do século XX. A dificuldade na verificação de tal evento, somada à firme convicção da maioria dos pesquisadores da época sobre a impossibilidade do nascimento de neurônios no sistema nervoso adulto, resultou em expressiva demora no avanço do conhecimento nesta área. O desenvolvimento de técnicas refinadas de estudo celular e a observação comprovada de neurogênese no cérebro de vertebrados adultos como o de pássaros canoros e roedores, serviu como importante alavanca para a desmistificação da impossibilidade de nascimento de neurônios no cérebro adulto. RESULTADOS: A descoberta da neurogênese em áreas específicas do cérebro adulto tem fomentado avanços em diversas áreas da pesquisa médica. No contexto de alterações neurológicas temos a constatação de neurogênese reativa no hipocampo de modelos animais de epilepsia do lobo temporal, logo após um episódio de estado de mal epiléptico. Diferenças filogenéticas entre roedores e humanos provavelmente existem, visto que há evidências de diminuição da neurogênese em crianças com epilepsia grave. A neurogênese pode estar também alterada frente ao uso de drogas, como parece ocorrer no tratamento com antidepressivos. CONCLUSÃO: O entendimento cada vez maior da neurogênese no cérebro adulto pode significar uma revolução no conceito da plasticidade do cérebro de um mamífero adulto, além de ter grande importância para o desenvolvimento de estratégias terapêuticas no tratamento de doenças neurodegenerativas e na possibilidade de promover a recuperação funcional de áreas lesadas do sistema nervoso central.
Efeitos benéficos do exercício físico nas epilepsias: o judô faz parte deste contexto?
Authors: Vieira Douglas E. , Scorza Fulvio A. , Silva Antonio C. da , Andrade Marília S. , Cavalheiro Esper A. , Albuquerque Marly de , Arida Ricardo M.
Published: December 2007

INTRODUÇÃO: Pessoas com epilepsia tem sido constantemente desaconselhadas a participarem de atividades físicas ou esportivas por receio do exercício provocar crises epilépticas. Apesar da atitude médica atual recomendando a participação em atividades esportivas, o estigma ainda persiste e as pessoas com epilepsia continuam menos ativas que a população em geral. OBJETIVOS: Neste sentido, vários estudos clínicos e experimentais têm demonstrado um efeito benéfico do exercício físico na epilepsia. O judô é um esporte tradicional e popular e pessoas com epilepsia freqüentemente perguntam aos médicos se podem participar deste tipo de esporte. CONCLUSÃO: Baseado nestas questões, este artigo de revisão propõe avaliar os riscos e benefícios da atividade física em pessoas com epilepsia e discutir o papel do judô neste contexto.
A poorly known case of watershed transposition between the São Francisco and upper Paraná river basins
Authors: Moreira Filho Orlando , Buckup Paulo Andreas
Published: December 2007

During construction of the Furnas hydroelectric power dam in the upper rio Paraná basin in the early 1960s, the rio Piumhi drainage outflow was diverted into the headwaters of the São Francisco river basin. The rio Piumhi was a right bank tributary of the rio Grande, which unites with the rio Paranaíba to form the rio Paraná. The transposition allowed the entire fish fauna of the rio Piumhi and associated swamps, lakes, and tributaries to intermingle with the fish fauna of the São Francisco basin via the ribeirão Sujo, a right bank tributary of the São Francisco. The transposition of the watershed may have had a major impact on the current composition of the fish fauna of the upper rio São Francisco watershed.
Revision of the South American freshwater fish genus Laemolyta Cope, 1872 (Ostariophysi: Characiformes: Anostomidae)
Authors: Mautari Kelly Cristina , Menezes Naércio Aquino
Published: December 2007

The anostomid genus Laemolyta Cope, 1872, is redefined.Various morphological, especially osteological characters in addition to the commonly utilized features of dentition proved useful for its characterization. A taxonomic revision of all species was made using meristics, morphometrics and color pattern. Five species are recognized: Laemolyta fernandezi Myers, 1950, from the río Orinoco (Venezuela) and the sub-basins Tocantins/Araguaia and Xingu, L. orinocensis (Steindachner, 1879), restricted to the río Orinoco, L. garmani (Borodin, 1931) and L. proxima (Garman, 1890), from the Amazon basin with the latter also occurring in the Essequibo River (Guiana), and L. taeniata (Kner, 1859), from the Amazon and Orinoco basins. Laemolyta garmani macra is considered a synonym of L. garmani, L. petiti a synonym of L. fernandezi, and L. nitens and L. varia synonyms of L. proxima. Lectotypes are designated herein for L. orinocencis and L. taeniata.
Abundance, feeding and reproduction of Salminus sp. (Pisces: Characidae) from mountain streams of the Andean piedmont in Venezuela
Authors: Rodríguez-Olarte Douglas , Taphorn B. Donald C.
Published: December 2007

To obtain basic information for management, aspects of the ecology of Salminus sp. (Pisces: Characidae), were studied in piedmont rivers of the southwestern flank of the Andes in Venezuela. Collections were made with seines of various lengths and mesh sizes, and both underwater and terrestrial observations were recorded to estimate abundance and feeding events. Interviews with local fishermen and inhabitants were made to obtain data on use. The species is present along the entire length of the Andean piedmont in Venezuela, although in some rivers it is now scarce. Small individuals form mixed schools with Brycon whitei, but larger Salminus sp. usually only school with others of the same species. Average abundance was greater in larger rivers, and didn't vary appreciably with season for any of the rivers studied. Size and weight ranged from 15.1 to 40.5 cm SL and 47.7 to 1,210 g, respectively. Females had maximum ovary maturity at the beginning of the rainy season, with an average fecundity of 35,834 eggs, and spawning occurred during spates of high water. Feeding was crepuscular, with most events recorded during the first and last hours of sunlight. In smaller fish up to 20 cm SL, the diet was varied, but above that size fish were the principal food item. Salminus sp. has little commercial importance in this region but forms an important part of the local subsistence fishery, and occasionally it is targeted for sport fishing. The minimum legal size of capture for the species should be raised, since the current limit permits the capture of many sexually immature individuals.
Microglanis pataxo, a new catfish from southern Bahia coastal rivers, northeastern Brazil (Siluriformes: Pseudopimelodidae)
Authors: Sarmento-Soares Luisa M. , Martins-Pinheiro Ronaldo F. , Aranda Arion T. , Chamon Carine C.
Published: December 2007

A new pseudopimelodid catfish of the genus Microglanis, collected in small rivers at the lower and middle Peruípe, middle Jucuruçu and Cahy basins, in the southeastern coast of the Bahia state, is described. The new species has a comparatively high number of anal fin proximal radials, 12, shaped as thin tubes, the last one bearing a laminar extension; a pectoral fin spine with a bony point and with a smaller number of serrations on its posterior border; seven pleural ribs and a narrow head width. We provide information on the external morphology and also on some osteological features for the new species. A key to species is presented for the coastal drainages between Rio de Janeiro and Bahia states.
Astyanax aff. fasciatus Cuvier, 1819 (Teleostei; Characidae): evidences of a species complex in the upper rio Tibagi basin (Paraná, Brazil)
Authors: Artoni Roberto Ferreira , Shibatta Oscar Akio , Gross Maria Claudia , Schneider Carlos Henrique , Almeida Mara Cristina de , Vicari Marcelo Ricardo , Bertollo Luiz Antonio Carlos
Published: December 2007

Four populations of Astyanax aff. fasciatus of the upper rio Tibagi (municipal district of Ponta Grossa, Paraná State, Brazil), had their karyotypes and morphometry analyzed. The cytogenetic data show the occurrence of distinct karyotypes (cytotypes), here named cytotype A, with 2n=48 chromosomes (6m+18sm+14st+10a), cytotype B, with 2n=50 chromosomes (8m+18sm+14st+10a) and cytotype C, with 2n=50 chromosomes (8m+18sm+14st+10a). The distribution pattern of the constitutive heterochromatin was very similar between cytotypes A and B, but diverged in relation to cytotype C. Distinct cytotypes may occur in sympatry in the upper rio Tibagi region, with the exception of the Furna 2 sample, which presents cytotype A exclusively. In addition, a specimen with 2n=49 chromosomes (7m+18sm+14st+10a) was also found and, by the characteristics presented, may be a consequence of a rare hybridization event between cytotypes A and B. The morphometric analyses of canonical variates indicate a consistent isolation of the Furna 2 sample, while the other samples seem to be superimposed, indicating a possible gene flow or even a recent isolation event. This model points to a probable complex of cryptic species in the studied region.
Tectonic history and the biogeography of the freshwater fishes from the coastal drainages of eastern Brazil: an example of faunal evolution associated with a divergent continental margin
Authors: Ribeiro Alexandre Cunha
Published: December 2007

The eastern Brazilian coastal drainages are of great biogeographical significance, because of their highly endemic fish faunas. Phylogenetic patterns suggest a close biotic relationship between the rivers that flow into the Atlantic and those on the adjacent upland crystalline shield. However, little has been said on the dynamics of the geological processes causally related to the cladogenetic events between these areas. Distributional and phylogenetic patterns suggest a close association with the geological history of the passive continental margin of South America, from the Cretaceous to the present day. In this area megadome uplifts, rifting, vertical movements between rifted blocks and the erosive retreat of the South American eastern continental margin are hypothesized as the main geological forces controlling the distribution of freshwater fishes. The tectonic activity associated with the break-up of Gondwana and separation of South America and Africa formed six megadomes that control most of the current courses of the main crystalline shield river basins. Except for basins located at the edges of such megadomes, these river systems developed long, circuitous routes over the ancient Brazilian crystalline shield before emptying into the recently opened Atlantic Ocean. Initial cladogenetic events between upland crystalline drainages and Atlantic tributaries were probably associated with vicariant processes, and some ancient basal sister-groups of widespread inclusive taxa are found in these coastal hydrographic systems. Later, generalized erosive denudation resulted in an isostatic adjustment of the eastern margin of the platform. These, along with reactivations of ancient rifts led to vertical movements between rifted blocks and gave rise, in southeastern Brazil, to taphrogenic (rift related) basins. These basins, such as the Taubaté, São Paulo, Curitiba and Volta Redonda basins, among others, captured adjacent upland drainages and fauna. The fossil fishes from the Tremembé Formation (Eocene-Oligocene of Taubaté Basin) exemplify this process. Other taphrogenic systems of Tertiary age were also identified in other segments of the Atlantic continental margin, such as in Borborema province, in NE Brazil, with marked influence over drainage patterns. At the same time, erosive retreat of the eastern margin of the platform successively captured upland rivers, which became Atlantic tributaries evolving associated to main rift systems. The continued nature of these processes explains the mixed phylogenetic and distributional patterns between Atlantic tributaries and the upland crystalline shield areas, especially in the southeastern continental margin, represented by successively, less inclusive sister-groups associated with cladogenetic events from the Late Cretaceous to the present.
Checklist comparison and dominance patterns of the fish fauna at Taim Wetland, South Brazil
Authors: Garcia Alexandre M. , Bemvenuti Marlise A. , Vieira João P. , Marques David M. L. Motta , Burns Marcelo D. M. , Moresco Alex , Condini Mario Vinicius L.
Published: December 2007

Taim Hydrological System is a unique subtropical wetland in southern Brazil harboring an exceptional biological diversity. In 1978, an ecological reserve was established to protect part of this area from increasing anthropogenic impacts in its surroundings. Fishes have been poorly investigated in this system. Based on a multi-gear sampling study encompassing several years (2001-2005), and on comparisons with previous fish inventories, we provide an up-to-date species list of fishes occurring in the Taim Wetland. In addition, we made the first preliminary description of fish dominance patterns found in the main lakes of the system (Flores, Nicola, Jacaré and Mangueira). Checklist comparison resulted in 62 fish species distributed in 24 families, with Characidae (19 species) and Cichlidae (7) showing the highest species richness. Six species are cited for the first time in the reserve: Trachelyopterus lucenai (Auchenipteridae), Hoplosternum littorale (Callichthyidae), Rineloricaria cadeae (Loricariidae), Eigenmannia trilineata (Sternopygidae), Odontesthes mirinensis and O. perugiae (Atherinopsidae). Apparently, the black catfish T. lucenai invaded the system in the last decade and became one of the dominant species in the pelagic waters. Although differences in gears hindered direct comparisons, differences in species composition and dominance patterns between shallow margins and pelagic waters of lakes seem to occur in the lakes. A more diverse assemblage dominated by small fishes (< 5cm) occurred in the protected, vegetated lakes margins. In contrast, an assemblage with lower species richness comprised of larger fishes (> 15 cm) seemed to dominate in pelagic waters.
TEMPERATE MARINE RESERVES ENHANCE TARGETED BUT NOT UNTARGETED FISHES IN MULTIPLE NO‐TAKE MPAS
Authors: Tetreault Irene , Ambrose Richard F.
Published: December 2007

Although many papers report the effects of no‐take marine protected areas (MPAs or reserves), scientifically rigorous empirical studies are rare, particularly for temperate reef fishes. We evaluated the responses of fish populations to protection from fishing in reserves by comparing densities and sizes inside and outside of five no‐take reserves in southern California, USA. Our results are robust because we compared responses across multiple rocky‐reef reserves in two different years and controlled for possible site differences by (a) ensuring that habitat characteristics were the same inside and outside reserves, and (b) sampling species that are not targeted, which would not be expected to have a direct response to fishing. We compared fish density and size and calculated biomass and egg production across all five sites. Fishes targeted by recreational and/or commercial fisheries consistently exhibited increases in mean density (150%), size (30%), biomass (440%), and egg production (730%) inside reserves. Reserve effects were greatest for legal‐sized targeted fishes: significantly greater densities were found exclusively inside reserves for targeted species (580%), the largest size classes existed only inside reserves, and mean biomass was 1000% higher. These responses were unlikely to have been caused by habitat differences because there were no significant differences in habitat characteristics between reserve and control locations. Densities of non‐targeted species did not differ between reserve and non‐reserve locations, further supporting the conclusions that differences in targeted species between reserve and control locations were due to harvesting rather than site‐specific effects. Although MPAs cannot replace traditional fisheries management, the concentration of increased biomass and egg production is a unique MPA benefit that serves both reserves and fisheries. Scientifically rigorous studies that include multiple reserves, such as this study, are needed to inform management and policy decisions.
A MODEL FOR ENERGETICS AND BIOACCUMULATION IN MARINE MAMMALS WITH APPLICATIONS TO THE RIGHT WHALE
Authors: Klanjscek Tin , Nisbet Roger M. , Caswell Hal , Neubert Michael G.
Published: December 2007

We present a dynamic energy budget (DEB) model for marine mammals, coupled with a pharmacokinetic model of a lipophilic persistent toxicant. Inputs to the model are energy availability and lipid‐normalized toxicant concentration in the environment. The model predicts individual growth, reproduction, bioaccumulation, and transfer of energy and toxicant from mothers to their young. We estimated all model parameters for the right whale; with these parameters, reduction in energy availability increases the age at first parturition, increases intervals between reproductive events, reduces the organisms' ability to buffer seasonal fluctuations, and increases its susceptibility to temporal shifts in the seasonal peak of energy availability. Reduction in energy intake increases bioaccumulation and the amount of toxicant transferred from mother to each offspring. With high energy availability, the toxicant load of offspring decreases with birth order. Contrary to expectations, this ordering may be reversed with lower energy availability. Although demonstrated with parameters for the right whale, these relationships between energy intake and energetics and pharmacokinetics of organisms are likely to be much more general. Results specific to right whales include energy assimilation estimates for the North Atlantic and southern right whale, influences of history of energy availability on reproduction, and a relationship between ages at first parturition and calving intervals. Our model provides a platform for further analyses of both individual and population responses of marine mammals to pollution, and to changes in energy availability, including those likely to arise through climate change.
PLANT‐TRAIT‐BASED MODELING ASSESSMENT OF ECOSYSTEM‐SERVICE SENSITIVITY TO LAND‐USE CHANGE
Authors: Quétier Fabien , Lavorel Sandra , Thuiller Wilfried , Davies Ian
Published: December 2007

Evidence is accumulating that the continued provision of essential ecosystem services is vulnerable to land‐use change. Yet, we lack a strong scientific basis for this vulnerability as the processes that drive ecosystem‐service delivery often remain unclear. In this paper, we use plant traits to assess ecosystem‐service sensitivity to land‐use change in subalpine grasslands. We use a trait‐based plant classification (plant functional types, PFTs) in a landscape modeling platform to model community dynamics under contrasting but internally consistent land‐use change scenarios. We then use predictive models of relevant ecosystem attributes, based on quantitative plant traits, to make projections of ecosystem‐service delivery. We show that plant traits and PFTs are effective predictors of relevant ecosystem attributes for a range of ecosystem services including provisioning (fodder), cultural (land stewardship), regulating (landslide and avalanche risk), and supporting services (plant diversity). By analyzing the relative effects of the physical environment and land use on relevant ecosystem attributes, we also show that these ecosystem services are most sensitive to changes in grassland management, supporting current agri‐environmental policies aimed at maintaining mowing of subalpine grasslands in Europe.
MANIPULATING DECAY TIME FOR EFFICIENT LARGE‐MAMMAL DENSITY ESTIMATION: GORILLAS AND DUNG HEIGHT
Authors: Kuehl Hjalmar S. , Todd Angelique , Boesch Christophe , Walsh Peter D.
Published: December 2007

Large‐mammal surveys often rely on indirect signs such as dung or nests. Sign density is usually translated into animal density using sign production and decay rates. In principle, such auxiliary variable estimates should be made in a spatially unbiased manner. However, traditional decay rate estimation methods entail following many signs from production to disappearance, which, in large study areas, requires extensive travel effort. Consequently, decay rate estimates have tended to be made instead at some convenient but unrepresentative location. In this study we evaluated how much bias might be induced by extrapolating decay rates from unrepresentative locations, how much effort would be required to implement current methods in a spatially unbiased manner, and what alternate approaches might be used to improve precision. To evaluate the extent of bias induced by unrepresentative sampling, we collected data on gorilla dung at several central African sites. Variation in gorilla dung decay rate was enormous, varying by up to an order of magnitude within and between survey zones. We then estimated what the effort–precision relationship would be for a previously suggested “retrospective” decay rate (RDR) method, if it were implemented in a spatially unbiased manner. We also evaluated precision for a marked sign count (MSC) approach that does not use a decay rate. Because they require repeat visits to remote locations, both RDR and MSC require enormous effort levels in order to gain precise density estimates. Finally, we examined an objective criterion for decay (i.e., dung height). This showed great potential for improving RDR efficiency because choosing a high threshold height for decay reduces decay time and, consequently, the number of visits that need to be made to remote areas. The ability to adjust decay time using an objective decay criterion also opens up the potential for a “prospective” decay rate (PDR) approach. Further research is necessary to evaluate whether the temporal bias inherent in such an approach is small enough to ignore, given the 10–20‐fold increases in precision promised by a PDR approach.
CLIMATE CHANGE AND FORESTS OF THE FUTURE: MANAGING IN THE FACE OF UNCERTAINTY
Authors: Millar Constance I. , Stephenson Nathan L. , Stephens Scott L.
Published: December 2007

We offer a conceptual framework for managing forested ecosystems under an assumption that future environments will be different from present but that we cannot be certain about the specifics of change. We encourage flexible approaches that promote reversible and incremental steps, and that favor ongoing learning and capacity to modify direction as situations change. We suggest that no single solution fits all future challenges, especially in the context of changing climates, and that the best strategy is to mix different approaches for different situations. Resources managers will be challenged to integrate adaptation strategies (actions that help ecosystems accommodate changes adaptively) and mitigation strategies (actions that enable ecosystems to reduce anthropogenic influences on global climate) into overall plans. Adaptive strategies includeresistanceoptions (forestall impacts and protect highly valued resources),resilienceoptions (improve the capacity of ecosystems to return to desired conditions after disturbance), andresponseoptions (facilitate transition of ecosystems from current to new conditions). Mitigation strategies include options to sequester carbon and reduce overall greenhouse gas emissions. Priority‐setting approaches (e.g., triage), appropriate for rapidly changing conditions and for situations where needs are greater than available capacity to respond, will become increasingly important in the future.
TERRESTRIAL LIMING BENEFITS BIRDS IN AN ACIDIFIED FOREST IN THE NORTHEAST
Authors: Pabian Sarah E. , Brittingham Margaret C.
Published: December 2007

Studies in Europe have reported negative effects of acid deposition on forest birds, and research in North America has identified links between forest bird abundance and rates of acid deposition. We examined the bird community in an acidified forest in central Pennsylvania (USA) and evaluated the effects of terrestrial lime application on birds. We used a before–after control–impact (BACI) study design, with one year of observation before (2003) and three years after lime application (2004, 2005, and 2006). Between the 2003 and 2004 field seasons, 4500 kg/ha of dolomitic lime were applied to two of four 100‐ha watersheds. Each year, we monitored bird abundance and Ovenbird (Seiurus aurocapilla) eggshell thickness and territory size. Soil and snail abundance data were also collected. The bird community and territory size results indicated that the study area may be providing low‐quality habitat for forest birds, perhaps as a result of acid deposition. We found lower forest bird abundances than have been found in less acidified areas of Pennsylvania, and larger Ovenbird territory sizes than have been found in other studies. We found a significant positive relationship between soil calcium and bird abundance, indicating that soil calcium may affect bird abundance. Liming increased soil calcium and pH and led to increased snail and bird abundances. After liming, bird abundance was positively related to snail abundance. No significant changes occurred in Ovenbird territory size or eggshell thickness. Our results suggest that acid deposition could be responsible for reduced bird abundance, and that liming is a potential mitigation technique.
EFFECTS OF THE HERBICIDE ROUNDUP ON FRESHWATER MICROBIAL COMMUNITIES: A MESOCOSM STUDY
Authors: Pérez G. L. , Torremorell A. , Mugni H. , Rodríguez P. , Vera M. Solange , Nascimento M. do , Allende L. , Bustingorry J. , Escaray R. , Ferraro M. , Izaguirre I. , Pizarro H. , Bonetto C. , Morris Donald P. , Zagarese H.
Published: December 2007

The impact of the widely used herbicide glyphosate has been mainly studied in terrestrial weed control, laboratory bioassays, and field studies focusing on invertebrates, amphibians, and fishes. Despite the importance of phytoplankton and periphyton communities at the base of the aquatic food webs, fewer studies have investigated the effects of glyphosate on freshwater microbial assemblages. We assessed the effect of the commercial formulation Roundup using artificial earthen mesocosms. The herbicide was added at three doses: a control (without Roundup) and two treatments of 6 and 12 mg/L of the active ingredient (glyphosate). Estimates of the dissipation rate (k) were similar in the two treatments (half‐lives of 5.77 and 7.37 d, respectively). The only two physicochemical parameters showing statistically significant differences between treatments and controls were the downward vertical spectral attenuation coefficient kd(λ), where λ is wavelength, and total phosphorus concentration (TP). At the end of the experiment, the treated mesocosms showed a significant increase in the ratio kd(490 nm)/kd(550 nm) and an eightfold increase in TP. Roundup affected the structure of phytoplankton and periphyton assemblages. Total micro‐ and nanophytoplankton decreased in abundance in treated mesocosms. In contrast, the abundance of picocyanobacteria increased by a factor of about 40. Primary production also increased in treated mesocosms (roughly by a factor of two). Similar patterns were observed in the periphytic assemblages, which showed an increased proportion of dead : live individuals and increased abundances of cyanobacteria (about 4.5‐fold). Interestingly, the observed changes in the microbial assemblages were captured by the analysis of the pigment composition of the phytoplankton, the phytoplankton absorption spectra, and the analysis of the optical properties of the water. The observed changes in the structure of the microbial assemblages are more consistent with a direct toxicological effect of glyphosate rather than an indirect effect mediated by phosphorus enrichment.
A General Agreement on Higher Education: GATS, Globalization, and Imperialism
Authors: Collins Christopher S.
Published: December 2007

Through successive rounds of negotiations, the World Trade Organization (WTO) encourages countries to commit their higher education system to the mandates of the General Agreement on Trade in Services (GATS). The WTO is an organization committed to the aggressive trade liberalization of services like higher education. This ideology, known as neoliberalism (Apple, 2005) is redefining the role of higher education. Through critical discourse analysis (Fairclough, 2003), three genres of documents have been analyzed in search of the ideology and power relations imbedded in the texts. These genres include informational documents, the legal text of GATS, and proposals from the USA, Australia, New Zealand, and Japan calling for the reduction of trade barriers in higher education. The relationship between the developed countries who are calling for a reduction in trade barriers and developing countries who are struggling to provide public education could be further strained through an international set of trade rules like GATS. Language and text can create, shift, or maintain ideologies. In the case of GATS, the ideology reflects a new imperialism where more powerful countries retain developing countries as markets in which they continue to rule intellectually.
Malaysian Educators and Their Perspectives on the Iraq War: A Case Study
Authors: Cashman Timothy G.
Published: December 2007

This case study provides perspectives on the War in Iraq with information collected from Sabah, Malaysia, educators. The author has analyzed input from Sabahan teachers regarding their discussions of United States-led war efforts in Iraq. The implications for discourse in Sabahan classrooms are described. The author then argues that Sabahan perspectives can impact discussions of the war's overall effects in American classrooms and, in turn, broaden the curriculum in American schools.
The Rebirth of Educational Exchange: Anglo-German University Level Youth Exchange Programmes after the Second World War
Authors: Naumann Cindy
Published: December 2007

In the early years of the Second World War the British had already begun post-war planning for education in Germany. They expressed a need to re-educate Germans and re-establish personal contacts with German people. One tool conceived to achieve these policy objectives was educational exchange. This paper will examine British educational exchange policy in post-war Germany, including how educational exchange came to be a part of post-war educational policy in Germany, what types of exchange programmes were established and how exchange programmes addressed educational policy objectives. It will focus on programmes for university level youth, utilising documentary evidence from archival sources and an historical approach to analysis. The aim of the paper is to provide a clearer conception of how educational exchange programmes between the British and Germans developed in the immediate post-war period.
Beyond Competition: Institutional Isomorphism in U.S. Accounting Research
Authors: Tuttle Brad , Dillard Jesse
Published: December 2007

We propose remedies to the dramatic reduction in the diversity of research topics within the academic accounting literature. As a basis for our recommendations, we apply institutional theory in the field of academic accounting research and propose that responses to identifiable institutional influences rather than competitive forces account for the current exclusion of nonfinancial accounting topics. All three processes of institutional isomorphism (mimetic, coercive, and normative) appear to shape the organizational field of accounting research. However, the field has reached a stage where it is primarily, but not exclusively, motivated by the normative isomorphism. As such, institutional pressures often eclipse theoretical relevance, individual research preferences, and practical applicability. These effects pervade aspects of the accounting academy beyond publishing. We outline programs and propose actions for enhancing diversity as prescriptions for countering the institutional forces acting within the field of academic accounting research.
Legal Systems and Earnings Quality: The Role of Auditor Industry Specialization
Authors: Kwon Soo Young , Lim Chee Yeow , Tan Patricia Mui-Siang
Published: December 2007

This paper extends prior studies in auditor industry specialization to an international setting and examines if the impact of industry specialist auditors on earnings quality is dependent on the legal environments. Using data for 28 countries over 20 industries from 1993 to 2003, we find that clients of industry specialist auditors have lower discretionary current accruals and higher earnings response coefficients than clients of nonspecialist auditors. In addition, we find that the impact of auditor industry specialization on earnings quality increases as the legal environment weakens. Collectively, the results suggest that the benefits from engaging the services of industry specialist auditors increase as a country's legal environment shifts from a strong to a weak environment. Our results are robust to the inclusion of additional control variables.
Does Industry Expertise Improve the Efficiency of Audit Judgment?
Authors: Moroney Robyn
Published: December 2007

Prior studies have found that industry specialists are more effective when working in specialization. It has been argued that they should also be more efficient, but this has not been tested to date. The purpose of this study is to determine whether industry specialists are more efficient at each stage of the decision-making process when working in specialization. By breaking down and measuring efficiency at each stage of the decision-making process, the opportunity is afforded to measure and compare the relative efficiencies of two groups of specialists in very different industries, the manufacturing, and superannuation (pension fund) industries. A controlled experiment was conducted in the offices of each of the Big 4 accounting firms. The two groups of specialists are found to vary in the decision processes they use, bringing into question the assumption that all specialists behave the same when working in specialization. It is the differences that are found between the industry groups that have interesting implications for future research.
The Association between Audit-Firm Tenure and Audit Fees Paid to Successor Auditors: Evidence from Arthur Andersen
Authors: Kealey Burch T. , Lee Ho Young , Stein Michael T.
Published: December 2007

This study tests whether prior auditor-client tenure is associated with the audit fees paid to the successor auditor. In the past, studying the association between tenure with the prior auditor and fees charged by the successor was problematic because of the difficulty in controlling for the causes of the auditor change. However, the collapse of Andersen in late 2002 led to a significant number of exogenous auditor switches. Using a sample of former Andersen clients, our major finding is that audit fees charged by the successor auditor varied positively with the length of the prior auditor's tenure. Given that the audit market is efficient, the observed positive association between current fees and prior auditor tenure suggests to us that successor auditors perceived higher risk from new clients having longer tenure with their previous auditor.
Differences in the Role of Job-Relevant Information in the Budget Participation-Performance Relationship among U.S. and Mexican Managers: A Question of Culture or Communication
Authors: Leach-López Maria A. , Stammerjohan William W. , McNair Frances M.
Published: December 2007

This study extends the stream of participative budgeting literature and, specifically, the work of Frucot and Shearon (1991). This study employs an expanded version of the path model introduced to this literature by Kren (1992) to examine and compare the budget participation-performance relationship for U.S. and Mexican mid-level managers. The expanded path model allows the examination of both the direct effects of budget participation on performance and the indirect effects of budget participation on performance that run through job satisfaction and job-relevant information.

The primary findings of this study are that while there are strong associations between budget participation and performance for both U.S. managers working in the U.S. and Mexican managers working for U.S.-controlled maquiladoras in Mexico, the causal mechanisms connecting budget participation to performance are quite different between these two groups. The information-communication aspect of the budget participation-performance relationship is much stronger among our Mexican managers and strongest among our Mexican managers who may face the greatest psychic distance from their U.S. parent companies: those who are not bilingual, and/or those who are supervised by U.S. nationals.
The Role of Financial Incentives and Social Incentives in Multi-Task Settings
Authors: Brüggen Alexander , Moers Frank
Published: December 2007

In this paper, we investigate the role of financial incentives and social incentives in multi-task settings where the agent makes an effort-level choice and an effort-allocation choice. We focus on a setting where these choices are not independent and an active trade-off between effort level and effort allocation exists. Social incentives play a crucial role in this trade-off. While financial incentives increase the effort level, social incentives congruent with the principal's interest mitigate the distortions in effort allocation associated with financial incentives, which improves the effectiveness of financial incentives. In a 2×2 experiment, we find that participants who receive distorting financial incentives provide significantly more total effort than participants who receive a fixed wage, but they allocate effort significantly less congruently. However, the effort-allocation distortion caused by distorting financial incentives is significantly reduced by congruent social incentives. We further find that the level of effort on the unmeasured task is not significantly different between fixed wages and financial incentives, which implies that distortions in effort allocation are driven by doing more of the measured task instead of doing less of the unmeasured task. Our findings have important implications for both theory building and organizational practices.
Product Costing for Decision Making in Certain Variable-Proportion Technologies
Authors: Dhavale Dileep G.
Published: December 2007

Most methods and techniques in management accounting assume that a production technology consumes inputs in a fixed proportion. This paper develops product-costing measures for pricing and decision-making purposes for homogeneous variable-proportion technologies using first-order conditions and Euler's theorem. The results developed in this paper show that relevant costs under these circumstances are conventional full costs adjusted by a factor that is a function of returns to scale of a variable-proportion technology.

In the development of the above results, it is shown that, for any technology, the price of a product is a linear function of its full cost only for a certain type of demand function. For all other demand functions, the relationship between the price and the full cost is nonlinear.

The fixed- and the variable-proportion technologies are compared using a Monte Carlo simulation to determine the relative magnitudes of errors in product costs and prices, and differences in profit resulting from inappropriate use of a fixed-proportion model in a variable-proportion technology environment. The simulation results indicate that the costs are about 3 percent higher for fixed-proportion technology over a range of returns to scale values. The pricing error, on the other hand, is significant and varies from 70 percent lower to 50 percent higher compared to the correct prices. Variance analyses of difference in profits under the two technologies indicate that the errors in costing and pricing under fixed-proportion technology result in significantly lower profits.