Download or read book The Genetic Structure of Natterjack Toad Bufo Calamita Populations and the Role of the River written by Petra Ramseier and published by . This book was released on 2000 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Approaches in Natural Resource Conservation and Management written by J. Andrew DeWoody and published by Cambridge University Press. This book was released on 2010-06-14 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended for undergraduate and graduate students in conservation biology, natural resource management, and ecology, this book compiles compelling case histories in molecular ecology.
Download or read book Population Dynamics of the Natterjack Toad Bufo Calamita in a Fragmented Pond Complex South West Ireland written by Aurélie Emily Aubry and published by . This book was released on 2009 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis documented and explored empirical data on populations of natterjack toads (Bufo calamita Laurenti), a pond-breeding amphibian particularly vulnerable to climate change, habitat degradation and fragmentation. The research used data collected in the field (census and environmental data, mark-recapture study) to assess the spatiotemporal dynamics of toad populations at local (2-5km) and regional (>10km) scales, to identify the local environmental determinants of toad breeding activity and success and to assess the movement patterns of juvenile and adult toads within and between breeding sites. There was no synchrony in the toad breeding activity and success at the local level, suggesting that populations function as individual clusters independent of each other, with little or irregular dispersal among populations. Regional synchrony in both rainfall and temperature probably explain the observed regional synchrony in the number of egg strings (used as a surrogate for adult breeding female population size). Using a model selection approach, results indicated that the abundance and diversity of predators of tadpoles were the most influential factors on toad reproductive success. A 46-day mesocosm experiment indicated that the presence of B. calamita tadpoles and their predators (here the dragonfly Sympetrum striolatum larvae) could enhance the functioning of pond ecosystems through both direct and indirect effects, in particular through increases in decomposition rates and enhanced secondary production. Several aspects of the research suggested that some of the toad populations were structured as source-sink populations, where the viability of local populations in sink habitats relies on immigration from source areas. The maintenance of a network of ponds within the dispersal range of species is therefore essential to ensure the long-term viability of amphibian populations, especially for those species (e.g. B. calamita) breeding in temporary ponds.
Download or read book The Natterjack Toad written by Trevor John Clark Beebee and published by . This book was released on 1983 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Density related features of natterjack toad Bufo calamita populations in Britain written by J. S. Denton and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Genetic Structure of Boreal Toad Bufo Boreas Boreas in Utah written by Todd C. Hogrefe and published by . This book was released on 2001 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Structure and Disease Prevalence of Boreal Toads Bufo Boreas in Glacier National Park written by Brett Rebekah Addis and published by . This book was released on 2013 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amphibians are more threatened than any other vertebrate group, with 41% of species experiencing declines. The causes of most declines are not well understood, though many declines have been linked to the emerging infectious disease chytridiomycosis. Additionally, amphibians are physiologically constrained to moist habitats and considered poor dispersers; thus, they may suffer genetic consequences of population isolation. To address threats to the persistence of boreal toads (Bufo boreas) in Glacier National Park, USA, I genotyped 551 individuals at 11 microsatellite loci and used spatially independent (STRUCTURE) and spatially explicit (GENELAND) Bayesian methods to describe population genetic structure and identify barriers to gene flow. I found evidence of hierarchical population structure: individuals were splint into high and low elevation groups, and 2 secondary groups were detected within the high elevation group. These results indicate that elevation strongly influences genetic structure. Genetic variation was high, but allelic richness declined with increasing elevation. I tested a subset of the samples for Batrachochytrium dendrobatidis (Bd), the fungal pathogen which causes chytridiomycosis. Thirty-seven of 109 toads tested positive for Bd. Infection prevalence was not correlated with elevation, but -surprisingly- increased with individual heterozygosity. This finding suggests that dispersal may be facilitating the spread of disease because heterozygosity is highest where dispersal and gene flow are greatest.
Download or read book Latitudinal and altitudinal variation of life history traits in natterjack toads Bufo calamita written by Neus Oromí Farrús and published by . This book was released on 2011 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2003 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics Abstracts written by and published by . This book was released on 2001 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of the Use and Effectiveness of Wildlife Crossings written by John A. Bissonette and published by Transportation Research Board. This book was released on 2008 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB¿s National Cooperative Highway Research Program (NCHRP) Report 615: Evaluation of the Use and Effectiveness of Wildlife Crossings explores development of an interactive, web-based decision guide protocol for the selection, configuration, and location of wildlife crossings.
Download or read book Ecology Abstracts written by and published by . This book was released on 1986 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indexes journal articles in ecology and environmental science. Nearly 700 journals are indexed in full or in part, and the database indexes literature published from 1982 to the present. Coverage includes habitats, food chains, erosion, land reclamation, resource and ecosystems management, modeling, climate, water resources, soil, and pollution.
Download or read book Current Advances in Ecological Environmental Sciences written by and published by . This book was released on 1992-07 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by and published by . This book was released on 2008 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2000 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions of the North American Wildlife and Natural Resources Conference written by and published by . This book was released on 1999 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes another issue of 1936 ed. without illus.
Download or read book Reintroduction of a Declining Amphibian written by Amy Jo Lind and published by . This book was released on 2005 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
