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  • 1
    Publication Date: 2024-03-29
    Description: Foreword by Richard J. Stevenson, Macquarie University (Australia): It was long thought that the human nose might be able to discriminate somewhere in the order of 10,000 different odourants. The recent finding that the human nose can discriminate something like a trillion different smells serves as yet another reminder that we have again underestimated the capacity of our sense of smell (Bushdid, Magnasco, Vosshall & Keller, 2014). This volume serves as a further corrective for anyone who should hold the view that olfaction is unimportant in human affairs. The papers presented in this ebook, carefully collated and overseen by Aldo Zucco, Benoist Schaal, Mats Olsson and Ilona Croy, showcase a large number of quite different reasons for studying the applied side of olfaction, and indeed human olfaction in general. The 23 contributions presented here cover a broad range of topics, which illustrate contemporary interests in our field. Although with a strong applied focus, a noteworthy feature of this ebook is the richness of the theoretical perspectives that are developed. These range from considerations of olfactory perception, memory, expertise, and priming right the way through to receptor genetics. These contributions, from many leading experts in the field, will surely shape much of the applied work linking olfaction to disease, which is a further focus of this ebook. In respect to health and disease, the chapters on aging, pregnancy, depression, alcohol dependency and environmental odours, present overviews and rich new data on many contemporary problems, to which the study of olfaction is now contributing. A particularly notable aspect of olfactory experience is the affective impact that odours can have on people and their lives. The ebook covers some particularly intriguing aspects of work in this area, with empirical studies investigating dissociations between wanting and liking, stress reduction in the elderly, mother-infant bonding, and the emotions that different odourants can evoke. This affective line of work is nicely complemented by empirical studies on expertise, the effect of odours on visual attention, and the relationship between particular personality traits and interest in olfaction. The gradual appropriation of methods from cognitive neuroscience into olfaction is also nicely represented in this ebook, with at least three of the chapters reporting data using neuroimaging, including a particular intriguing study looking at recognition of odours in mixtures. Finally, the close links between olfactory perception and sensory evaluation are also reflected in a chapter on wine. I hope that readers of this e-book will be struck, as I have been in reading its various chapters, how much olfaction affects our lives, and how the study of this sense can enrich it.
    Keywords: BF1-990 ; Q1-390 ; Disease ; Health ; Everyday Life ; Cognition ; Applied olfaction ; Expertise ; bic Book Industry Communication::J Society & social sciences::JM Psychology ; thema EDItEUR::J Society and Social Sciences::JM Psychology
    Language: English
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  • 2
    Publication Date: 2015-10-27
    Description: During the expedition with the Swedish ice-breaker HMS Ymer to the Arctic in 1980 samples of a number of vertebrate species were collected for determination of persistent organic pollutants (POPs). Specimens of Arctic char ( Salvelinus alpinus ), glaucous gull ( Larus hyperboreus ), common eider ( Somateria mollissima ), Brünnich's guillemot ( Uria lomvia ), ringed seal ( Phoca hispida ), and polar bear ( Ursus maritimu During the 1980 expedition to the Arctic with the icebreaker Ymer , a number of vertebrate species were sampled for determination of persistent organic pollutants. Samples of Arctic char ( Salvelinus alpinus , n =34), glaucous gull ( Larus hyperboreus , n =8), common eider ( Somateria mollissima , n =10), Brünnich’s guillemot ( Uria lomvia , n =9), ringed seal ( Pusa hispida , n =2) and polar bear ( Ursus maritimus , n =2) were collected. With the exception of Brünnich’s guillemot, there was a marked contamination difference of birds from western as compared to eastern/northern Svalbard. Samples in the west contained a larger number of polychlorinated biphenyl (PCB) congeners and also polychlorinated terphenyls, indicating local sources. Brünnich’s guillemots had similar pollutant concentrations in the west and east/north; possibly younger birds were sampled in the west. In Arctic char, pollutant profiles from lake Linnévatn ( n =5), the lake closest to the main economic activities in Svalbard, were similar to profiles in Arctic char from the Shetland Islands ( n =5), but differed from lakes to the north and east in Svalbard ( n =30). Arctic char samples had higher concentrations of hexachlorocyclohexanes (HCHs) than the marine species of birds and mammals, possibly due to accumulation via snowmelt. Compared to the Baltic Sea, comparable species collected in Svalbard had lower concentrations of PCB and dichlorodiphenyltrichloroethane (DDT), but similar concentrations indicating long-range transport of hexachlorobenzene, HCHs and cyclodiene pesticides. In samples collected in Svalbard in 1971, the concentrations of PCB and DDT in Brünnich’s guillemot ( n =7), glaucous gull ( n =2) and polar bear ( n =2) were similar to the concentrations found in 1980. Keywords: Polar bear; ringed seal; glaucous gull; Brünnich’s guillemot; common eider; Arctic char. (Published: 26 October 2015) To access the supplementary material for this article, please see supplementary files in the column to the right (under Article Tools). Citation: Polar Research 2015, 34 , 21129, http://dx.doi.org/10.3402/polar.v34.21129
    Print ISSN: 0800-0395
    Electronic ISSN: 1751-8369
    Topics: Geography , Geosciences
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  • 3
    Publication Date: 2015-09-18
    Description: The genetic benefits individuals receive from mate choice have been the focus of numerous studies, with several showing support for both intrinsic genetic benefits and compatibility effects on fertilization success and offspring viability. However, the robustness of these effects have rarely been tested across an ecologically relevant environmental gradient. In particular, sperm environment is a crucial factor determining fertilization success in many species, especially those with external fertilization. Here, we test the importance of sperm environment in mediating compatibility-based selection on fertilization using a factorial breeding design. We detected a significant intrinsic male effect on fertilization success at only one of four sperm concentrations. Compatibility effects were significant at the two highest sperm concentrations and, interestingly, the magnitude of the compatibility effect consistently increased with sperm concentration. This suggests that females are able to modify the probability of sperm–egg fusion as the amount of sperm available increases. Our study shows for the first time that estimates of compatibility and intrinsic parental effects on fertilization vary across sperm environment. Interestingly, compatibility effects consistently increased with sperm concentration suggesting that females are able to modify the probability of sperm-egg fusion as the amount of sperm increases. Our study highlights that the processes modulating fertilization success are more complex than previous appreciated.
    Electronic ISSN: 2045-7758
    Topics: Biology
    Published by Wiley
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  • 4
    Publication Date: 2015-10-09
    Description: Background: Present-day climate change has altered the phenology (the timing of periodic life cycle events) of many plant and animal populations worldwide. Some of these changes have been adaptive, leading to an increase in population fitness, whereas others have been associated with fitness decline. Representing short-term responses to an altered weather regime, hitherto observed changes are largely explained by phenotypic plasticity. However, to track climatically induced shifts in optimal phenotype as climate change proceeds, evolutionary capacity in key limiting climate- and fitness-related traits is likely to be crucial. In order to produce realistic predictions about the effects of climate change on species and populations, a main target for conservation biologists is thus to assess the potential of natural populations to respond by these two mechanisms. In this study we use a large 15-year dataset on an ectotherm model, the Swedish sand lizard (Lacerta agilis), to investigate how higher spring temperature is likely to affect oviposition timing in a high latitude population, a trait strongly linked to offspring fitness and survival. Results: With an interest in both the short- and potential long-term effect of rising temperatures, we applied a random regression model, which yields estimates of population-level plasticity and among-individual variation in the average, as well as the plastic, response to temperature. Population plasticity represents capacity for short-term adjustments whereas variation among individuals in a fitness-related trait indicates an opportunity for natural selection and hence for evolutionary adaptation. The analysis revealed both population-level plasticity and individual-level variation in average laying date. In contrast, we found no evidence for variation among females in their plastic responses to spring temperature, which could demonstrate a similarity in responses amongst females, but may also be due to a lack of statistical power to detect such an effect. Conclusion: Our findings indicate that climate warming may have positive fitness effects in this lizard population through an advancement of oviposition date. This prediction is consistent over shorter and potentially also longer time scales as the analysis revealed both population-level plasticity and individual-level variation in average laying date. However, the genetic basis for this variation would have to be examined in order to predict an evolutionary response.
    Electronic ISSN: 1471-2148
    Topics: Biology
    Published by BioMed Central
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  • 5
    Publication Date: 2017-06-09
    Description: Telomeres in human fibroblasts shorten progressively during in vitro culturing and trigger replicative senescence. Furthermore, shortened telomeres can be used as biomarkers of disease. These observations have led to the suggestion that telomere dynamics may also be associated with viability and selection for life history variation in non-human taxa. Model systems to examine this suggestion would particularly benefit from the coexistence of multiple phenotypes within the same species with different life history trade-offs, since those could be compared in terms of telomere characteristics. This scenario also provokes the classic question of why one morph does not have marginally higher fitness and replaces the others. One explanation is that different morphs have different reproductive tactics with equal relative fitness. In Australian painted dragons ( Ctenophorus pictus ), males differ in head color, the presence or absence of a gular bib, and reproductive expenditure. Red males out-compete yellow males in dominance contests, while yellow males copulate quickly and have higher success in sperm competition than red males. Males with bibs better defend partners against rival matings, at the cost of loss of body condition. We show that yellow-headed and bib-less males have longer telomeres than red, blue and bibbed males, suggesting that telomere length is positively associated with higher investment into self-maintenance and less reproductive expenditure. We have studied a polymorphic lizard with different reproductive tactics and investments and test the hypothesis that morphs differ in telomere dynamics in relation to those morph tactics.
    Electronic ISSN: 2045-7758
    Topics: Biology
    Published by Wiley
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  • 6
    Publication Date: 2016-09-30
    Description: The mechanisms underlying honest signal expression remain elusive and may involve the integration of social and physiological costs. Corticosterone is a socially modulated metabolic hormone that mediates energy investment and behavior and may therefore function to deter dishonest signal expression. We examined the relationship between corticosterone and green badge coloration in male sand lizards ( Lacerta agilis ), hypothesizing that physiological and behavioral costs resulting from elevated baseline glucocorticoids function in maintenance of honest signal expression. We found that large-badged males had higher corticosterone titer, with this relationship apparent at the end of the season and absent early in the season. Large-badged males also suffered higher ectoparasite load (number of tick nymphs), despite being in better condition than small-badged males. Ectoparasite load was positively related to corticosterone titer early in the season at the time of badge formation. High-condition individuals had lower corticosterone and lower numbers of ectoparasites than low-condition individuals, suggestive of conditional variation in ability to withstand costs of corticosterone. We found an opposing negative relationship between corticosterone titer and endoparasite load. Corticosterone titer was also negatively associated with male mobility, a fitness-determining behavior in this species. Because badge size is involved in mediating agonistic social interactions in this species, our results suggest that badge-dependent variation in corticosterone is likely reflective of variation in social conditions experienced over the course of the season. Our results implicate corticosterone in maintenance of signal honesty, both early in the season through enforcement of physiological costs (ectoparasite load) and during the season through behavioral costs (male mobility). We propose that socially modulated variation in corticosterone critically functions in mediation of signal honesty without requiring a direct role for corticosterone in trait expression. We examined the relationship between corticosterone stress hormone and green badge coloration in male sand lizards ( Lacerta agilis ), hypothesizing that physiological and behavioral costs resulting from elevated baseline glucocorticoids function in maintenance of honest signal expression in this species. We found that both badge size and ectoparasite load were positively related to corticosterone titer and male mobility, a fitness-determining trait in this species, was negatively related to corticosterone titer. Because badge size is involved in mediating agonistic social interactions in this species, our results indicate that badge-dependent variation in corticosterone (only detectable at the end of the season) is likely related to variation in social conditions experienced over the course of the season and implicate corticosterone in maintenance of signal honesty, without necessitating a direct role in trait expression.
    Electronic ISSN: 2045-7758
    Topics: Biology
    Published by Wiley
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  • 7
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Melbourne, Australia : Blackwell Science Pty
    Austral ecology 30 (2005), S. 0 
    ISSN: 1442-9993
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract  We report on the effects of almost a decade of 1080-fox baiting on a lizard community in a mosaic Australian habitat. Replicated comparisons of baited versus non-baited control areas with near-identical histories of bush fires, grazing and climate showed a higher density of red fox tracks (Canis vulpes) in the non-baited areas. Furthermore, the fox-baited areas showed a more than five times higher density of sand goannas (Varanus gouldii), a species that strongly overlaps the red fox in food niche breadth and is itself a direct target of fox predation, in particular its eggs and young. Exclusion of predators from a natural habitat led to significant increases in the density of small lizards, suggesting that predation can drive lizard population dynamics in this ecosystem. Replicated pitfall-trapping in three habitats in the control areas (with high fox and low goanna density) versus the baited areas (with low fox and high goanna density) showed that fox baiting had positive effects on the density of diurnal scincid lizards in open grassland, whereas the control areas showed higher density of nocturnal gecko lizards. Our interpretation is that fox removal may result in a shift in the top predator towards the sand goanna. Historically, this indigenous, endemic species was the natural top predator. It has co-evolved with its prey and that may have moulded it into a more efficient lizard predator per encounter than the introduced fox.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 44 (1997), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 599-600 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] About one half of the r-protein genes map in the str-spc region at 72 min on the E. coli chromosome and the genes are arranged in four separate transcriptional units2. All the r-protein genes in the str-spc region are present on the F' factor KLF41 and most of the experiments were carried out with ...
    Type of Medium: Electronic Resource
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