bluuebunny/crossref_metadata_2025_split huggingface dataset:
Insects in a warmer world: ecological, physiological and life‐history responses of true bugs (Heteroptera) to climate change
Authors: MUSOLIN DMITRY L. 
Published: July 2007

AbstractFocusing on the southern green stink bug, Nezara viridula (Pentatomidae), in central Japan the effects of climate change on true bugs (Insecta: Heteroptera) are reviewed. In the early 1960s, the northern edge of the species's distribution was in Wakayama Prefecture (34.1°N) and distribution was limited by the +5°C coldest month (January) mean temperature isothermal line. By 2000, N. viridula was recorded 70 km further north (in Osaka, 34.7°N). Historical climate data were used to reveal possible causes of the northward range expansion. The increase of mean and lowest winter month temperatures by 1–2°C in Osaka from the 1950s to the 1990s improved potential overwintering conditions for N. viridula. This promoted northward range expansion of the species. In Osaka, adult diapause in N. viridula is induced after mid‐September, much later than in other local seed‐feeding heteropterans. This late diapause induction results in late‐season ineffective reproduction: some females start oviposition in autumn when the progeny have no chance of attaining adulthood and surviving winter. Both reproductive adults and the progeny die. A period from mid‐September to early November represents a phenological mismatch: diapause is not yet induced in all adults, but it is already too late to start reproduction. Females that do not start reproduction but enter diapause in September have reduced postdiapause reproductive performance: they live for a shorter period, have a shorter period of oviposition and produce fewer eggs in smaller egg masses compared with females that emerge and enter diapause later in autumn. To some extent, N. viridula remains maladapted to Osaka environmental conditions. Ecological perspectives on establishment in recently colonized areas are discussed. A review of available data suggests that terrestrial and aquatic Heteroptera species respond to climate change by shifting their distribution ranges, changing abundance, phenology, voltinism, physiology, behaviour, and community structure. Expected responses of Heteroptera to further climate warming are discussed under scenarios of slight (<2°C) and substantial (>2°C) temperature increase.
Using functional groups to investigate community response to environmental changes: two grassland case studies
Authors: VOIGT WINFRIED , PERNER JÖRG , HEFIN JONES T. 
Published: July 2007

AbstractFunctional groups (FG) are an useful generalization to investigate environmental change effects on biotic communities. Assigning species to FGs is a contextual task and carries an arbitrary element, regardless of whether the grouping is obtained a priori or by sophisticated numerical methods. Using two grassland community case studies, we show that even simple FG allocation based on growth form, architecture and longevity (plants and mosses), or foraging characteristics (above‐ground invertebrates) can be useful to increase our understanding of community processes. For example, the sensitivity of organisms to climate change increases with trophic rank and is higher in disturbed than in undisturbed communities. Complexity of interaction webs (in terms of web connectance), however, is larger in undisturbed than in disturbed communities. A significant and important relationship is likely to exist between anthropogenic disturbances, community complexity and the ecosystem effects of climate change. Trophic interactions may be disrupted much easier by climate changes in disturbed than in undisturbed communities where complexity may be buffering these effects.
Predicting adaptation of phenology in response to climate change, an insect herbivore example
Authors: Van ASCH MARGRIET , Van TIENDEREN PETER H. , HOLLEMAN LEONARD J. M. , VISSER MARCEL E. 
Published: July 2007

AbstractClimate change has led to an advance in phenology in many species. Synchrony in phenology between different species within a food chain may be disrupted if an increase in temperature affects the phenology of the different species differently, as is the case in the winter moth egg hatch–oak bud burst system. Operophtera brumata (winter moth) egg hatch date has advanced more than Quercus robur (pedunculate oak) bud burst date over the past two decades. Disrupted synchrony will lead to selection, and a response in phenology to this selection may lead to species genetically adapting to their changing environment. However, a prerequisite for such genetic change is that there is sufficient genetic variation and severe enough fitness consequences. So far, examples of observed genetic change have been few. Using a half‐sib design, we demonstrate here that O. brumata egg‐hatching reaction norm is heritable, and that genetic variation exists. Fitness consequences of even a few days difference between egg hatch and tree bud opening are severe, as we experimentally determined. Estimates of genetic variation and of fitness were then combined with a climate scenario to predict the rate and the amount of change in the eggs' response to temperature. We predict a rapid response to selection, leading to a restoration of synchrony of egg hatch with Q. robur bud opening. This study shows that in this case there is a clear potential to adapt – rapidly – to environmental change. The current observed asynchrony is therefore not due to a lack of genetic variation and at present it is unclear what is constraining O. brumata to adapt. This kind of model may be particularly useful in gaining insight in the predicted amount and rate of change due to environmental changes, given a certain genetic variation and selection pressure.
Dissecting the evolutionary impacts of plant invasions: bugs and beetles as native guides
Authors: CARROLL SCOTT P. , FOX CHARLES W. 
Published: July 2007

AbstractThe introduction of plants into new biogeographical realms is a main repercussion of human trade. The responses of native insects to alien plants may provide insight into how invaders influence ecological processes in their new communities. We illustrate this point with results from our field and lab studies of seed‐feeding insects on alien plants. Soapberry bugs (Jadera,Leptocoris) have colonized several species of weedy invasive plants (sapindaceous trees and vines) in the United States and Australia. After initial reduction in physiological performance, they evolved behavioral, morphological, physiological and life history adaptations permitting more efficient exploitation of those hosts. Those changes occurred quickly, in fewer than 100 generations (ca. 30–50 years). The underlying genetic changes are surprisingly complex, and also involve loss of function on native hosts. Contrasting with this is the bruchine beetle (Stator limbatus) on seeds of leguminous trees. Large numbers ofS. limbatusoviposit on an alien tree in Arizona, but few offspring survive. The main influence on larval survival is a maternal effect determined by the host the mother experiences as her eggs mature. Adaptive plasticity in egg size and composition may ultimately permit successful exploitation of novel resources. Together, these studies show that both complex genetic and developmental factors influence the integration of ecological and evolutionary processes in environments altered by anthropogenically initiated plant invasions. Tractable insect study systems may be valuable guides to understanding biotic dynamics in a changing world.
Management of obesity in primary care: nurses’ practices, beliefs and attitudes
Authors: Brown Ian , Stride Chris , Psarou Aikaterini , Brewins Louise , Thompson Joanne 
Published: July 2007

AbstractAim.  This paper is a report of a study to investigate patterns of clinical practice, beliefs and attitudes of primary care nurses with respect to obesity management.Background.  Nurses in primary care potentially play a key role in managing obesity, which has become a priority issue. There have been few studies of either the extent of clinical practice of nurses, or their attitudes and beliefs in this setting.Methods.  A correlational survey design was employed. Structured questionnaires were posted to 564 nurses and health visitors in primary care organizations in England. The response rate was 72·3%. The survey was conducted in April and May 2006.Findings.  Very few respondents reported training in obesity management, and most did not believe that organizational support was in place. Only practice nurses reported substantial clinical activity in obesity management, accounting for almost 5% of their contracted hours. This activity, comprised of assessment, lifestyle change support and referral, occurred in one‐to‐one consultations. Other nurses and health visitors reported much less activity, although they believed obesity to be an important health issue and its management an appropriate part of their role. Whilst outright negative stereotypes were rare, there were nevertheless a range of potentially negative beliefs and attitudes relating to obesity and obese patients. These views were related to the respondent's own body mass index but not to gender, age, experience and occupation.Conclusion.  Training and organizational support for obesity management are required by primary care nurses. Training should also address beliefs and attitudes about obesity and obese persons.
Association between complementary feeding practice and mothers education status in Islamabad
Authors: Liaqat P. , Rizvi M. A. , Qayyum A. , Ahmed H. 
Published: July 2007

AbstractObjectives  To examine the association between mothers education, complementary feeding practices and malnutrition amongst mothers attending outpatient clinics in Islamabad.Methods  Mothers of 500 Pakistani infants attending the Paediatric Outpatient department at the Federal Government Services Hospital, Islamabad completed pretested questionnaires on mother's educational status and complementary feeding practices.Results  A positive relationship was found between the nutritional status of infants and educational status of mothers (P < 0.001). The study revealed that the majority of infants with evidence of malnutrition belonged to the mothers with virtually no school education. A similar relationship was observed between the educational status of respondents and the introduction of complementary foods at an appropriate age (6 months) of infants (P < 0.001).Conclusion  Mother's education plays a vital role in increased receptivity to knowledge and awareness related to nutritional requirements of their infants.
The Mental Capacity Act 2005: implications for dietetic practice
Authors: Lyons C. , Brotherton A. , Stanley N. , Carrahar M. , Manthorpe J. 
Published: July 2007

AbstractThe Mental Capacity Act (MCA) 2005 will be implemented in England and Wales in 2007 and have consequences for dietitians who work with people who may lack capacity to make specific decisions. This paper will explore issues arising from the introduction of the Act and considers the implications for dietitians involved in the delivery of clinical care, using enteral feeding as an illustrative example.If patients lack capacity to make specific decisions, dietitians will be required to record if, how and why they reached a decision, how they are involved in the decision making process and need to be able to justify their actions in relation to those decisions. This paper discusses the importance of dietitians’ involvement in best interests decision making and considers the implications of decision making where people have drawn up a Lasting Power of Attorney. The role of such advance decisions is discussed and consideration is given to the potential compatibility of perspectives between the patient and family that may give rise to disputes.Dietitians may be well placed within multidisciplinary team working to ensure patients and their carers are part of the decision making process through effective communication and support for patients. Dietitians in England and Wales must consider the implications of the MCA upon their clinical practice and others outside these jurisdictions may like to reflect on the relevance of such developments in their own contexts.
Introduction history of Drosophila subobscura in the New World: a microsatellite‐based survey using ABC methods
Authors: PASCUAL M. , CHAPUIS M. P. , MESTRES F. , BALANYÀ J. , HUEY R. B. , GILCHRIST G. W. , SERRA L. , ESTOUP A. 
Published: July 2007

Abstract Drosophila subobscura is a Palearctic species that was first observed in South and North America in the early 1980s, and that rapidly invaded broad latitudinal ranges on both continents. To trace the source and history of this invasion, we obtained genotypic data on nine microsatellite loci from two South American, two North American and five European populations of D. subobscura. We analysed these data with traditional statistics as well as with an approximate Bayesian computation (ABC) framework. ABC methods yielded the strongest support for the scenario involving a serial introduction with founder events from Europe into South America, and then from South America into North America. Stable effective population size of the source population was very large (around one million individuals), and the propagule size was notably smaller for the introduction into South America (i.e. high bottleneck severity index with only a few effective founders) but considerably larger for the subsequent introduction into North America (i.e. low bottleneck severity index with around 100–150 effective founders). Finally, the Mediterranean region of Europe (and most likely Barcelona from the localities so far analysed) is proposed as the source of the New World flies, based on mean individual assignment statistics.
Historical and ecological determinants of genetic structure in arctic canids
Authors: CARMICHAEL L. E. , KRIZAN J. , NAGY J. A. , FUGLEI E. , DUMOND M. , JOHNSON D. , VEITCH A. , BERTEAUX D. , STROBECK C. 
Published: July 2007

AbstractWolves (Canis lupus) and arctic foxes (Alopex lagopus) are the only canid species found throughout the mainland tundra and arctic islands of North America. Contrasting evolutionary histories, and the contemporary ecology of each species, have combined to produce their divergent population genetic characteristics. Arctic foxes are more variable than wolves, and both island and mainland fox populations possess similarly high microsatellite variation. These differences result from larger effective population sizes in arctic foxes, and the fact that, unlike wolves, foxes were not isolated in discrete refugia during the Pleistocene. Despite the large physical distances and distinct ecotypes represented, a single, panmictic population of arctic foxes was found which spans the Svalbard Archipelago and the North American range of the species. This pattern likely reflects both the absence of historical population bottlenecks and current, high levels of gene flow following frequent long‐distance foraging movements. In contrast, genetic structure in wolves correlates strongly to transitions in habitat type, and is probably determined by natal habitat‐biased dispersal. Nonrandom dispersal may be cued by relative levels of vegetation cover between tundra and forest habitats, but especially by wolf prey specialization on ungulate species of familiar type and behaviour (sedentary or migratory). Results presented here suggest that, through its influence on sea ice, vegetation, prey dynamics and distribution, continued arctic climate change may have effects as dramatic as those of the Pleistocene on the genetic structure of arctic canid species.
High quantitative and no molecular differentiation of a freshwater snail (Galba truncatula) between temporary and permanent water habitats
Authors: CHAPUIS ELODIE , TROUVE SANDRINE , FACON BENOIT , DEGEN LOÏC , GOUDET JEROME 
Published: July 2007

AbstractWe investigate the variation in quantitative and molecular traits in the freshwater snail Galba truncatula, from permanent and temporary water habitats. Using a common garden experiment, we measured 20 quantitative traits and molecular variation using seven microsatellites in 17 populations belonging to these two habitats. We estimated trait means in each habitat. We also estimated the distributions of overall genetic quantitative variation (QST), and of molecular variation (FST), within and between habitats. Overall, we observed a lack of association between molecular and quantitative variance. Among habitats, we found QST > FST, an indication of selection for different optima. Individuals from temporary water habitat matured older, at a larger size and were less fecund than individuals from permanent water habitat. We discuss these findings in the light of several theories for life‐history traits evolution.
Phylogeography of a northeast Asian spruce, Picea jezoensis, inferred from genetic variation observed in organelle DNA markers
Authors: AIZAWA M. , YOSHIMARU H. , SAITO H. , KATSUKI T. , KAWAHARA T. , KITAMURA K. , SHI F. , KAJI M. 
Published: July 2007

AbstractRange‐wide genetic variation of the widespread cold‐temperate spruce Picea jezoensis was studied throughout northeast Asia using maternally inherited mitochondrial DNA and paternally inherited chloroplast DNA markers. This study assessed 33 natural populations including three varieties of the species in Japan, Russia, China, and South Korea. We depicted sharp suture zones in straits around Japan in the geographical distribution pattern of mitochondrial haplotypes (GST = 0.901; NST = 0.934). In contrast, we detected possible extensive pollen flow without seed flow across the straits around Japan during the past population history in the distribution pattern of chloroplast haplotypes (GST = 0.233; NST = 0.333). The analysis of isolation by distance of the species implied that by acting as a barrier for the movement of seeds and pollen, the sharp suture zones contributed considerably to the level of genetic differentiation between populations. Constructed networks of mitochondrial haplotypes allowed inference of the phylogeographical history of the species. We deduced that the disjunction with Kamchatka populations reflects range expansion and contraction to the north of the current distribution. Within Japan, we detected phylogeographically different types of P. jezoensis between Hokkaido and Honshu islands; P. jezoensis in Honshu Island may have colonized this region from the Asian continent via the Korean peninsula and the species in Hokkaido Island is likely to have spread from the Asian continent via Sakhalin through land bridges. Japanese endemism of mitochondrial haplotypes in Hokkaido and Honshu islands might have been promoted by separation of these islands from each other and from the Asian continent by the straits during the late Quaternary.
Phylogeographical structure in the subterranean tuco‐tuco Ctenomys talarum (Rodentia: Ctenomyidae): contrasting the demographic consequences of regional and habitat‐specific histories
Authors: MORA MATÍAS S. , LESSA ENRIQUE P. , CUTRERA ANA P. , KITTLEIN MARCELO J. , VASSALLO ALDO I. 
Published: July 2007

AbstractIn this work we examined the phylogeography of the South American subterranean herbivorous rodent Ctenomys talarum (Talas tuco‐tuco) using mitochondrial DNA (mtDNA) control region (D‐loop) sequences, and we assessed the geographical genetic structure of this species in comparison with that of subterranean Ctenomys australis, which we have shown previously to be parapatric to C. talarum and to also live in a coastal sand dune habitat. A significant apportionment of the genetic variance among regional groups indicated that putative geographical barriers, such as rivers, substantially affected the pattern of genetic structure in C. talarum. Furthermore, genetic differentiation is consistent with a simple model of isolation by distance, possibly evidencing equilibrium between gene flow and local genetic drift. In contrast, C. australis showed limited hierarchical partitioning of genetic variation and departed from an isolation‐by‐distance pattern. Mismatch distributions and tests of neutrality suggest contrasting histories of these two species: C. talarum appears to be characterized by demographic stability and no significant departures from neutrality, whereas C. australis has undergone a recent demographic expansion and/or departures from strict neutrality in its mtDNA.
Genetic diversity in diploid vs. tetraploid Rorippa amphibia (Brassicaceae)
Authors: LUTTIKHUIZEN PIETERNELLA C. , STIFT MARC , KUPERUS PETER , VAN TIENDEREN PETER H. 
Published: July 2007

AbstractThe frequency of polyploidy increases with latitude in the Northern Hemisphere, especially in deglaciated, recently colonized areas. The cause or causes of this pattern are largely unknown, but a greater genetic diversity of individual polyploid plants due to a doubled genome and/or a hybrid origin is seen as a likely factor underlying selective advantages related to life in extreme climates and/or colonization ability. A history of colonization in itself, as well as a recent origin, and possibly a limited number of polyploidization events would all predict less genetic diversity in polyploids than in diploids. The null hypothesis of higher gene diversity in polyploids has to date hardly been quantified and is here tested in self‐incompatible Rorippa amphibia (Brassicaceae). The species occurs in diploid and tetraploid forms and displays clear geographical polyploidy in Europe. On the basis of eight microsatellite loci it can be concluded that the level of gene diversity is higher in tetraploids than in diploids, to an extent that is expected under neutral evolution when taking into account the larger effective population size in the doubled cytotype. There is thus no evidence for reduced genetic diversity in the tetraploids. The evidence presented here may mean that the tetraploids’ origin is not recent, has not been affected by bottlenecks and/or that tetraploids were formed multiple times while an effect of introgression may also play a role.
Climate change and evolution: disentangling environmental and genetic responses
Authors: GIENAPP P. , TEPLITSKY C. , ALHO J. S. , MILLS J. A. , MERILÄ J. 
Published: July 2007

AbstractRapid climate change is likely to impose strong selection pressures on traits important for fitness, and therefore, microevolution in response to climate‐mediated selection is potentially an important mechanism mitigating negative consequences of climate change. We reviewed the empirical evidence for recent microevolutionary responses to climate change in longitudinal studies emphasizing the following three perspectives emerging from the published data. First, although signatures of climate change are clearly visible in many ecological processes, similar examples of microevolutionary responses in literature are in fact very rare. Second, the quality of evidence for microevolutionary responses to climate change is far from satisfactory as the documented responses are often — if not typically — based on nongenetic data. We reinforce the view that it is as important to make the distinction between genetic (evolutionary) and phenotypic (includes a nongenetic, plastic component) responses clear, as it is to understand the relative roles of plasticity and genetics in adaptation to climate change. Third, in order to illustrate the difficulties and their potential ubiquity in detection of microevolution in response to natural selection, we reviewed the quantitative genetic studies on microevolutionary responses to natural selection in the context of long‐term studies of vertebrates. The available evidence points to the overall conclusion that many responses perceived as adaptations to changing environmental conditions could be environmentally induced plastic responses rather than microevolutionary adaptations. Hence, clear‐cut evidence indicating a significant role for evolutionary adaptation to ongoing climate warming is conspicuously scarce.