Relevant bibliographies by topics / Amphibian populations

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Amphibian populations'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Amphibian populations"

1

Lips, Karen R. "Overview of chytrid emergence and impacts on amphibians." Philosophical Transactions of the Royal Society B: Biological Sciences 371, no. 1709 (December 5, 2016): 20150465. http://dx.doi.org/10.1098/rstb.2015.0465.

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Chytridiomycosis is an emerging infectious disease of amphibians that affects over 700 species on all continents where amphibians occur. The amphibian–chytridiomycosis system is complex, and the response of any amphibian species to chytrid depends on many aspects of the ecology and evolutionary history of the amphibian, the genotype and phenotype of the fungus, and how the biological and physical environment can mediate that interaction. Impacts of chytridiomycosis on amphibians are varied; some species have been driven extinct, populations of others have declined severely, whereas still others have not obviously declined. Understanding patterns and mechanisms of amphibian responses to chytrids is critical for conservation and management. Robust estimates of population numbers are needed to identify species at risk, prioritize taxa for conservation actions, design management strategies for managing populations and species, and to develop effective measures to reduce impacts of chytrids on amphibians. This article is part of the themed issue ‘Tackling emerging fungal threats to animal health, food security and ecosystem resilience’.
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Crump, D. "The effects of UV-B radiation and endocrine-disrupting chemicals (EDCs) on the biology of amphibians." Environmental Reviews 9, no. 2 (June 1, 2001): 61–80. http://dx.doi.org/10.1139/a01-001.

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Statistical meta-analysis of large and diverse data sets has indicated that amphibians have been declining worldwide since the 1960s. Exposure to UV-B radiation (280–320 nm) and endocrine-disrupting chemicals (EDCs) have been considered as possible hypotheses to explain the observed declines. Equivocal conclusions have been reached with respect to the effects of UV-B on amphibian populations. Field and laboratory studies employing both ecologically relevant and enhanced UV-B levels have been conducted using a variety of amphibian species and reports differ with respect to the most sensitive developmental stage and the ultimate implications. UV-B radiation has also been shown to interact with other stressors (e.g., pesticides, polycyclic aromatic hydrocarbons, low pH) resulting in decreased survivorship for several amphibian species. Limited evidence of reproductive toxicity of xenobiotics in amphibians exist; however, early exposure to EDCs could cause abnormal development of the amphibian reproductive system, inhibit vital hormone messages that drive metamorphosis, and ultimately contribute to the decline of some amphibian populations. The available evidence suggests that more than one agent is contributing to amphibian population declines and the following review narrows the focus to address the existing data on the effects of UV-B, alone and in combination with other stressors, and EDCs on amphibian survivorship and development. Key words: amphibians, UV-B radiation, endocrine-disrupting chemicals, declines, review.
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Whitfield, SM, G. Alvarado-Barboza, JG Abarca, H. Zumbado-Ulate, RR Jimenez, and J. Kerby. "Ranavirus is widespread in Costa Rica and co-occurs with threatened amphibians." Diseases of Aquatic Organisms 144 (April 8, 2021): 89–98. http://dx.doi.org/10.3354/dao03576.

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Amphibians are globally threatened by emerging infectious diseases, and ranaviruses are among the most concerning pathogens to threaten species in the wild. We sampled for ranaviruses in wild amphibians at 8 sites in Costa Rica, spanning broad climatic zones and taxonomic associations. Seven of these sites are inhabited by highly threatened amphibian species that persist at low global population sizes after population declines due to amphibian chytridiomycosis. One of the surveyed sites is occupied by an introduced amphibian species, which is relatively rare in Central America but may be an important pathway for long-distance transport of ranaviruses. We detected ranavirus using quantitative polymerase chain reaction in 16.3% of the 243 individuals and among 5 of our 8 sites, but not at the site with the introduced species. Infection prevalence varied among species and sites, but not with mean annual temperature or mean annual precipitation. Infection intensity did not vary with species, site, temperature, or precipitation. Our results show that ranavirus infection is spatially widespread in Costa Rica, affecting a broad range of host species, and occurs across climatic zones—though we encountered no mortality or morbidity in our sampled species. Ranaviruses are known to cause intermittent mass mortality in amphibian populations, and the threatened species sampled here are likely vulnerable to population impacts from emerging ranaviruses. Therefore, we believe the potential impacts of ranaviruses on amphibian populations in tropical regions have likely been underestimated, and that they should be viewed as a potential major stressor to threatened amphibians in tropical regions.
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Garner, Trenton W. J., Benedikt R. Schmidt, An Martel, Frank Pasmans, Erin Muths, Andrew A. Cunningham, Che Weldon, Matthew C. Fisher, and Jaime Bosch. "Mitigating amphibian chytridiomycoses in nature." Philosophical Transactions of the Royal Society B: Biological Sciences 371, no. 1709 (December 5, 2016): 20160207. http://dx.doi.org/10.1098/rstb.2016.0207.

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Amphibians across the planet face the threat of population decline and extirpation caused by the disease chytridiomycosis. Despite consensus that the fungal pathogens responsible for the disease are conservation issues, strategies to mitigate their impacts in the natural world are, at best, nascent. Reducing risk associated with the movement of amphibians, non-amphibian vectors and other sources of infection remains the first line of defence and a primary objective when mitigating the threat of disease in wildlife. Amphibian-associated chytridiomycete fungi and chytridiomycosis are already widespread, though, and we therefore focus on discussing options for mitigating the threats once disease emergence has occurred in wild amphibian populations. All strategies have shortcomings that need to be overcome before implementation, including stronger efforts towards understanding and addressing ethical and legal considerations. Even if these issues can be dealt with, all currently available approaches, or those under discussion, are unlikely to yield the desired conservation outcome of disease mitigation. The decision process for establishing mitigation strategies requires integrated thinking that assesses disease mitigation options critically and embeds them within more comprehensive strategies for the conservation of amphibian populations, communities and ecosystems. This article is part of the themed issue ‘Tackling emerging fungal threats to animal health, food security and ecosystem resilience’.
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Eijkelkamp, Michaël A., Mirjam J. Borger, Ruben Kluit, and Jan Komdeur. "Extremely low amphibian roadkill probability on busy bicycle paths." Herpetological Journal 33, no. 1 (January 1, 2023): 1–5. http://dx.doi.org/10.33256/33.1.115.

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Road mortality can have a significant negative impact on amphibian population survival. Amphibian roadkill and how to avoid it are therefore widely studied, mostly on car roads but limitedly on bicycle paths. We investigated whether amphibian mortality on bicycle paths in Bargerveen, a Dutch Natura 2000 site, was affected by the number of passing cyclists and crossing amphibians. We investigated four transects on a daily basis during most of the amphibian spring migration in 2021. We counted and identified (to species level) all killed amphibians; further, we used cyclist counters and toad fences to assess the number of passing bicycles and crossing amphibians, respectively. We found 11 killed smooth newts Lissotriton vulgaris, out of 5,037 that crossed the bicycle paths. Although 11,453 anurans crossed, we found no killed anurans. The occurrence of killed smooth newts was not affected by the number of passing bicycles or crossing newts. The probability of being killed was extremely low for crossing smooth newts (0.22 %) and anurans (0 %), possibly because cyclists successfully avoid cycling over amphibians. Future monitoring should occur from early February to late November to include the complete active period of amphibians including juvenile dispersal, and across multiple successive years because amphibian numbers can vary largely between years. During our study period, however, amphibian mortality on bicycle paths in Bargerveen seems no threat to populations, despite the high numbers of cyclists. Keywords: road ecology, animal-cyclist collisions, smooth newts, anurans, conservation
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Wynne, Felicity J. "Detection of ranavirus in endemic and threatened amphibian populations of the Australian Wet Tropics Region." Pacific Conservation Biology 26, no. 1 (2020): 93. http://dx.doi.org/10.1071/pc19009.

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The amphibian chytrid fungus (Batrachochytrium dendrobatidis) has driven severe amphibian declines in the Australian tropics. These declines have resulted in species extirpations and extinctions, with many surviving in small, highly threatened populations. Despite the fragility of remaining populations, another group of lethal pathogens, ranaviruses, have rarely been investigated among native amphibians. Ranaviruses have previously been associated with fish, reptile and amphibian mortality events in Australia, yet remain poorly understood here, especially among amphibian hosts. Here, quantitative polymerase chain reaction assays were used to detect ranavirus presence from eight of 17 tested sites containing populations of endangered and critically endangered Australian frog species. Although present in these populations, ranavirus seems to be at the lower bounds of detectability of the assay, which makes firm diagnosis at the individual level unreliable. Repeated (n=14) detections of this pathogen, however, are highly indicative of its presence at each area where it was detected. Therefore, these populations are likely often exposed to ranavirus. The results of this study are not characteristic of populations experiencing rapid disease-associated die-offs or declines, but further investigations should be undertaken to examine the potential drivers of these pathogens to predict future emergence and potential threats to endangered Australian amphibians.
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Velo-Antón, Guillermo, David Alvarez, and Lucía Alarcón-Ríos. "Monsters in the city: multiple deformities increase in terrestrial-breeding urban salamanders." Amphibia-Reptilia 42, no. 3 (April 20, 2021): 391–98. http://dx.doi.org/10.1163/15685381-bja10057.

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Abstract Amphibians are subjected to an assortment of environmental stressors responsible for their population declines and malformations. Deciphering the underlying causes of amphibian deformities is challenging due to the complex nature and interplay among factors. We evaluated morphological deformities in 9 urban and 9 woodland populations of terrestrial-breeding fire salamanders. We report several types of malformations and higher incidences among urban populations. This model system allowed us to tease apart some of the common factors responsible for amphibian deformations, suggesting airborne/terrestrial pollutants, predation, and/or inbreeding as potential environmental stressors. Yet, the putative underlying factors of fire salamander deformities need to be properly addressed in thorough studies linking habitat quality and the prevalence of morphological abnormalities, as well as predator-prey interactions. Reporting deformation rates among amphibians is key to identify warning signals of population declines and preventing local extinctions.
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Burrow, Angela K., and Stacey Lance. "Restoration of Geographically Isolated Wetlands: An Amphibian-Centric Review of Methods and Effectiveness." Diversity 14, no. 10 (October 18, 2022): 879. http://dx.doi.org/10.3390/d14100879.

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Geographically isolated wetlands provide a critical habitat for pond-breeding amphibians, a taxa of broad conservation concern. Global wetland loss and degradation has made restoration essential for amphibian conservation. Restoration goals typically include recovering the wetlands’ physiochemical, hydrological, and ecological functions. However, for pond-breeding amphibians, successful restoration should also result in sustained populations, which is difficult to assess and infrequently reported. In this paper, we review the available evidence that restoration of geographically isolated wetlands promotes pond-breeding amphibian occupancy and population persistence. We provide an overview of restoration practices addressing hydrology, vegetation, and ecological processes within these unique environments and across spatial scales. We then summarize the evidence, and discuss the limitations, for evaluating successful restoration within the context of amphibian conservation across these categories. Finally, we provide recommendations for researchers and practitioners to leverage prior successes and establish systematic data collection and dissemination. Moving restoration of wetlands for amphibian conservation forward will require more robust data collection and reporting.
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deMaynadier, Phillip G., and Malcolm L. Hunter Jr. "The relationship between forest management and amphibian ecology: a review of the North American literature." Environmental Reviews 3, no. 3-4 (July 1, 1995): 230–61. http://dx.doi.org/10.1139/a95-012.

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Questions about the compatibility of forest harvesting practices and conservation of biological diversity are largely driven by concerns that habitat quality for many species may be degraded in intensively managed forest landscapes. We review the literature on relationships between common forest harvesting practices and the distribution and abundance of amphibians, a group that has attracted considerable attention in recent years because of their potential ecological importance in forest ecosystems and because of reports of widespread population declines. Clear-cut harvesting generally has negative short-term impacts on local amphibian populations, especially salamanders. An analysis of the results of 18 studies that examined the effects of clear-cutting on amphibians yielded a 3.5-fold median difference in abundance of amphibians on controls over clear-cuts. However, research on the influence of forest age suggests that the long-term effects of forest harvesting on amphibians are variable, and for many species these effects can be mitigated if regeneration practices leave adequate microhabitat structure intact. In contrast, long-term effects can be significant in forest plantations, which are often associated with intensive site preparations and stand management practices that modify levels of coarse woody debris and other microhabitats. Other forest practices reviewed for their effect on amphibians include prescribed fire, logging roads, and streamside harvesting. We discuss problems commonly encountered in the experimental design and measurement of forest amphibian populations, including a notable lack of pretreatment data, and outline several aspects of amphibian–forestry relationships in need of further research. Management recommendations relevant to conserving upland and riparian zone amphibian habitat during forest harvesting are offered.Key words: amphibians, clear-cutting, coarse woody debris, forest management, logging roads, plantations, prescribed fire, riparian, succession.
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Peterson, Charles, Edward Koch, and Paul Corn. "Monitoring Amphibian Populations in Yellowstone and Grand Teton National Parks." UW National Parks Service Research Station Annual Reports 15 (January 1, 1991): 39–47. http://dx.doi.org/10.13001/uwnpsrc.1991.2961.

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Many amphibian populations appear to be declining throughout much of the world (Corn and Fogleman 1984, Beiswenger 1986, McAllister and Leonard 1990, Wake and Morowitz 1990, Wake 1991). Declines appear to be particularly noticeable in the western United States in the true frogs and toads (families Ranidae and Bufonidae, respectively). For example, leopard frogs (Rana pipiens) and western toads (Bufo boreas) have disappeared from the majority of their historic ranges in Colorado (Corn et al. 1989) and populations of spotted frogs (Rana pretiosa) have gone extinct or declined on the periphery of their range in Washington, Oregon, California, Nevada, and Utah (McAllister and Leonard 1990). Monitoring amphibian populations is important for several reasons. First and most obvious, we need to know if and why amphibian populations are fluctuating so we can effectively manage and preserve them. Second, amphibians are important components of many ecosystems, both as predators and prey, often making up a significant amount of a system's biomass (Pough 1983). Finally, amphibians are potentially sensitive indicators of environmental change because of a unique combination of biological characteristics such as their permeable skins, biphasic life cycles, and aquatic reproduction and development (Wake and Morowitz 1990). For these reasons, the monitoring of amphibians populations has been recommended as an "early warning system" of environmental change (Beiswenger 1986, 1988, Wake 1991).
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Dissertations / Theses on the topic "Amphibian populations"

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Patrick, David A. "The Effects of Forest Practices on a Maine Amphibian Community." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/PatrickDA2007.pdf.

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Hopkins, Samantha. "Chytridiomycosis in amphibian populations in the Western Cape, South Africa." Thesis, University of the Western Cape, 2002. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_7137_1359702947.

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There have been many cases reported of amphibian populations declining. These are often due to anthropogenic factors such as habitat destruction and pollution. However, some eclines have not had an obvious cause and many of these have been investigated and found to be due to pathogenic disease. Batrachochytrium dendrobatidis is a recently described pathogen of frogs. The population declines that have been associated with chytridiomycosis have occurred in relatively undisturbed areas such as national parks. The declines tend to occur at higher altitudes or in colder climates. This is thought to be because of the frog immune system being slower at lower temperatures. This project gives an overview of chytrid infection in the Western Cape and at a small number of sites in the Northern Cape and Eastern Cape.

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Schneider, Amy Elizabeth. "Continued study of the use of created ponds for amphibian breeding in fragmented forested areas." [Huntington, WV : Marshall University Libraries], 2008. http://www.marshall.edu/etd/descript.asp?ref=876.

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Nowakowski, Aaron J. "Connectivity of fragmented amphibian populations in a Neotropical landscape." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1515.

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A high proportion of amphibian species are threatened with extinction globally, and habitat loss and degradation are the most frequently implicated causes. Rapid deforestation for the establishment of agricultural production is a primary driver of habitat loss in tropical zones where amphibian diversity is highest. Land-cover change affects native assemblages, in part, through the reduction of habitat area and the reduction of movement among remnant populations. Decreased gene flow contributes to loss of genetic diversity, which limits the ability of local populations to respond to further environmental changes. The focus of this dissertation is on the degree to which common land uses in Sarapiquí, Costa Rica impede the movement of two common amphibian species. First, I used field experiments, including displacement trials, and a behavioral landscape ecology framework to investigate the resistance of pastures to movement of Oophaga pumilio. Results from experiments demonstrate that pastures do impede movement of O. pumilio relative to forest. Microclimatic effects on movement performance as well as limited perceptual ranges likely contribute to reduced return rates through pastures. Next, I linked local processes to landscape scale estimates of resistance. I conducted experiments to measure habitat-specific costs to movement for O. pumilio and Craugastor bransfodrii, and then used experimental results to parameterize connectivity models. Model validation indicated highest support for resistance estimates generated from responses to land-use specific microclimates for both species and to predator encounters for O. pumilio. Finally, I used abundance and experiment-derived resistance estimates to analyze the effects of prevalent land uses on population genetic structure of the two focal species. While O. pumilio did not exhibit a strong response to landscape heterogeneity and was primarily structured by distances among sites, C. bransfordii genetic variation was explained by resistance estimates from abundance and experiment data. Collectivity, this work demonstrates that common land uses can offer different levels of resistance to amphibian movements in Sarapiquí and illustrates the value of investigating local scales processes to inform interpretation of landscape-scale patterns.
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Bol, Leslie D. "Amphibian recruitment success at a landscape scale." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=78250.

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Size fluctuations in amphibian populations at single breeding sites are related to variations in recruitment from the larval stage. However, overall patterns of abundance should be related to the pattern of recruitment success at the many sites where breeding occurs over a landscape. Recruitment patterns for six amphibian species, Ambystoma laterale, A. maculatum, Bufo americanus, Hyla versicolor, Pseudacris crucifer and Rana sylvatica, were investigated at multiple sites within the 10 km 2 Mont St. Hilaire nature reserve during 2001 and 2002. Amphibians bred at eighteen sites but recruitment occurred at only 8 and 11 sites in each year, respectively. Hydroperiod and predation were the most important determinants of recruitment. Four species suffered multiple recruitment failures both years. However, when sites were considered collectively, recruitment was successful for all species because of asynchronous recruitment patterns across heterogeneous sites. Amphibian population dynamics may be stochastic at any single site but recruitment success at multiple sites is a plausible predictor of abundance and trends in regional population persistence.
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Meyer, Shavonne. "Landscape history, dispersal, and the genetic structure of amphibian populations." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101625.

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Habitat fragmentation can influence the genetics of a population through the direct loss of genetic diversity, and by the genetic processes that occur as a result of small remnant populations or the geographic isolation of populations. I examined the population genetics of two woodland amphibian species in localities with different land-use histories. The wood frog (Rana sylvatica) and the red-backed salamander (Plethodon cinereus) use the same general habitat but differ with respect to a few key life-history characteristics relating to dispersal. I then compared between species the relative influence each land-use scenario had on the population genetic structure. I found that habitat fragmentation affected the population genetics of the two amphibians and did so differently for each species. The differential population genetic response of these two amphibians to habitat fragmentation reinforces the important role of life-history characteristics in how the genetic structure of a population is shaped over time.
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Strong, Becky. "Investigating the effects of organic pollutants on amphibian populations in the UK." Thesis, Lancaster University, 2016. http://eprints.lancs.ac.uk/82811/.

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Amphibians are undergoing dramatic population declines, with environmental pollution reported as a significant factor in such declines. Technologies are required that are able to monitor populations at risk of deteriorating environmental quality in a rapid, high-throughput and low-cost manner. The application of biospectroscopy in environmental monitoring represents such a scenario. Biospectroscopy is based on the vibrations of functional groups within biological samples and may be used to signature effects induced by chemicals in cells and tissues. Here, attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy in conjunction with multivariate analysis was implemented in order to distinguish between embryos, whole tadpoles at an early stage of development and individual tissues of late-stage tadpoles of the common frog collected from ponds in the UK with varying levels of water quality, due to contamination from both urban and agricultural sources. In addition, a Xenopus laevis cell line was exposed to low-levels of fungicides used in agriculture and assessed with ATR-FTIR spectroscopy. Embryos, in general did not represent a sensitive life stage for discriminating between ponds based on their infrared spectra. In contrast, tadpoles exposed to agricultural and urban pollutants, both at early and late stages of development were readily distinguished on the basis of their infrared spectra. ATR-FTIR spectroscopy also readily detected fungicideinduced changes in X.laevis cells, both as single-agent and binary mixture effects. Data reported in this study confirm the use of ATR-FTIR spectroscopy as a sensitive technique capable of detecting small changes in cellular groups, and as such represents a valuable starting point for its use in the monitoring of amphibian populations. However further research is needed in order to overcome confounding factors existent in natural populations of complex organisms.
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Harpole, Douglas N. "Terrestrial Salamanders in southern Appalachain Harwood Forests: Relative Abundance, Nutritional Condition, and Response to Silvicultural Practices." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/42710.

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We compared techniques for assessing nutritional condition in 3 groups of terrestrial salamanders. We measured variability in species richness and relative abundance before harvest at 5 sites in the Jefferson National Forest of southwest Virginia and compared the effects of 7 silvicultural treatments on terrestrial salamander richness and relative abundance at 1 site.
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Ma, Chui-ying, and 馬翠盈. "Assessment of the effects of agricultural practices on amphibian populations in Long Valley wetlands, Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48199461.

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Agricultural practices have altered natural wetland habitats for thousands of years in lowland areas of Southeast Asia, and currently these highly modified wetlands constitute some of the most important remaining habitats for amphibians. However, decreasing area of arable land and increased use of chemicals may affect the persistence of lowland amphibian populations that are now dependent on these habitats. I investigated how amphibians responded to different kinds of farming treatments in a large agricultural wetland in Hong Kong. In the first part of the study, I assessed the occurrence of breeding amphibians in 53 farming plots in 2010 and 2011. Anuran call surveys were conducted at night at the plots once a week from March to August for two years. Environmental variables were measured and used to develop models to examine species presence, occupancy, and detection probabilities. Wet agricultural plots supported 10 species of amphibians and all had detection probabilities of < 1 that varied seasonally and yearly. Organically managed plots and shallow water plots yielded high species richness and particularly attracted the ornate pygmy frog (Microhyla fissipes) and the paddy frog (Fejervarya limnocharis). Air temperature and humidity were the relatively consistent predictors that influenced calling activity of the four most commonly detected species (M. fissipes; F. limnocharis; brown tree frog Polypedates megacephalus; and G?nther’s frog Hylarana guentheri). For the second part of the study, I assessed the impacts of fertilizers on amphibians. Using mesocosm experiments in the field, I compared the effects of a chemical fertilizer (granular urea) and an organic fertilizer (peanut cake) on the survival and growth of hatchlings of Polypedates megacephalus, the marbled pygmy frog (Microhyla pulchra), Asian common toad (Duttaphrynus melanostictus) and Chinese bullfrog (Hoplobatrachus rugulosus). Fertilizers were applied at low, manufacturer-recommended, and high levels, and survival and snout-vent-length were measured after 21 days. No individuals survived in the chemical fertilizer treatment at the recommended application level. Conversely, survival was high for P. megacephalus (96%), M. pulchra (54%) and D. melanostictus (90%), but relatively low for H. rugulosus (18%), at the recommended level of the organic fertilizer. P. megacephalus and M. pulchra tadpoles showed increased growth in elevated concentrations of organic fertilizer. Polypedates megacephalus tadpoles were 1.6 times longer in the low concentration and almost double in length in the high concentration treatments. Similarly, increased growth in M. pulchra in all organic treatments resulted in abbreviated time to metamorphosis. Chemical fertilizers are clearly detrimental to early life stages of these amphibians, but organic fertilizers may confer benefits including a shorter time to, and larger size at, metamorphosis. These results suggest that where amphibian conservation is a priority, shifts in the management of wet agricultural crops and limiting the use of chemical fertilizers may increase the suitability of breeding habitats and survival at early life stages.
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Biological Sciences
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Master of Philosophy
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Walker, Susan Frances. "Geographical patterns in the distribution of Batrachochytrium dendrobatidis and outbreaks of fatal chytridiomycosis in European amphibian populations." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.478915.

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Books on the topic "Amphibian populations"

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Mazerolle, Marc J. Night driving surveys as an amphibian monitoring technique in Kouchibouguac National Park, 1995-2002. Halifax, N.S: Parks Canada, 2003.

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United States. Bureau of Land Management. Lower Snake River District, United States. Bureau of Land Management. Upper Snake River District, Idaho. Department of Fish and Game. Magic Valley Region, and United States. Bureau of Land Management. Idaho State Office, eds. Amphibian inventory of the Jarbidge and Snake River Resource Areas: Final report. Boise, Idaho: Bureau of Land Management, Idaho State Office, 1996.

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Beck, Jonathan M. Amphibians of the Coeur d'Alene basin: A survey of Bureau of Land Management lands. Boise, Idaho: Bureau of Land Management, Idaho State Office, 1998.

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Conservancy, The Nature, and California. Department of Fish and Game, eds. Checklist of amphibians and reptiles: Carrizo Plain Natural Area. Bakersfield, Calif.?]: [U.S. Dept. of the Interior, Bureau of Land Management], 1996.

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Wilson, Kristine W. Amphibian surveys, central region 1999-2003. Salt Lake City, Utah: Utah Division of Wildlife Resources, 2004.

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Hallock, Lisa A. Herpetofauna inventory of Bureau of Land Management sites in Douglas, Franklin, Grant, Lincoln, Klickitat, Washington, 1998: Summary of work completed in 1998. Spokane, Wash: Bureau of Land Management, Spokane District Office, 1999.

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Blais, Simon. Suivi des populations d'anoures du Québec méridional selon les inventaires de chants réalisés par des bénévoles de 1993 à 1996: Travail réalisé dans le cadre du cours, Stage en aménagement de la faune terrestre. [Rimouski]: Université du Québec à Rimouski, 1998.

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Hébert, Jean-Sébastien. Abondance des anoures dans le Québec méridional selon l'inventaire des chants réalisés par les bénévoles à l'été 1994: Travail réalisé dans le cadre du cours Stage en faune terrestre pour le Ministère de l'environnement et de la faune. Québec: Gouvernement du Québec, Ministère de l'environnement et de la faune, Direction de la faune et des habitats, 1995.

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Linder, G., S. Krest, D. Sparling, and E. Little, eds. Multiple Stressor Effects in Relation to Declining Amphibian Populations. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2003. http://dx.doi.org/10.1520/stp1443-eb.

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Sredl, Michael J. Understanding and mitigating effects of chytrid fungus to amphibian populations in Arizona. Phoenix, Ariz: Arizona Game and Fish Dept., 2003.

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Book chapters on the topic "Amphibian populations"

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Oldham, R. S., and M. J. S. Swan. "Conservation of Amphibian Populations in Britain." In Species Conservation: A Population-Biological Approach, 141–57. Basel: Birkhäuser Basel, 1991. http://dx.doi.org/10.1007/978-3-0348-6426-8_10.

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Márque, Rafael, and Pere Alberch. "Monitoring Environmental Change Through Amphibian Populations." In Global Change and Mediterranean-Type Ecosystems, 471–81. New York, NY: Springer New York, 1995. http://dx.doi.org/10.1007/978-1-4612-4186-7_23.

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Grant, Bruce W., Anton D. Tucker, Jeffrey E. Lovich, Anthony M. Mills, Philip M. Dixon, and J. Whitfield Gibbons. "The Use of Coverboards in Estimating Patterns of Reptile and Amphibian Biodiversity." In Wildlife 2001: Populations, 379–403. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2868-1_31.

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Bell, Rayna C., Luis M. P. Ceríaco, Lauren A. Scheinberg, and Robert C. Drewes. "The Amphibians of the Gulf of Guinea Oceanic Islands." In Biodiversity of the Gulf of Guinea Oceanic Islands, 479–504. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06153-0_18.

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AbstractThis chapter reviews the diversity, evolutionary relationships, ecology, and conservation of the Gulf of Guinea oceanic islands’ endemic caecilian and anuran fauna. A total of nine amphibian species (representing five families) are known from São Tomé and Príncipe islands, all of which are endemic. No amphibians have been reported from Annobón. Taxonomic research on this group of animals began in the second half of the nineteenth century with subsequent refinement following the advent of molecular techniques. The presence of several amphibians from distinct evolutionary lineages is unexpected for oceanic islands and has motivated several biogeographic studies to reconstruct the evolutionary histories of these enigmatic species. Yet, the continental source for many of the islands’ amphibians remains unknown. The amphibians of São Tomé and Príncipe also exhibit intriguing phenotypic diversity for addressing long-standing hypotheses in evolutionary biology, including body size evolution and gigantism on islands, intraspecific variation and interspecific divergence in coloration, and reproductive and dietary niche partitioning. Recent studies have confirmed the presence of the fungal pathogen Batrachochytrium dendrobatidis in amphibian communities on both São Tomé and Príncipe, but it is unclear whether this pathogen is negatively impacting local populations. Most of the Gulf of Guinea oceanic island endemic amphibians are incredibly abundant and widespread, occurring in primary forest, secondary forest, and agricultural habitats across the islands. Three anuran species (Hyperolius thomensis, Leptopelis palmatus, Ptychadena newtoni) have more limited distributions and/or more specialized ecologies; consequently, additional land-use change poses a threat to the long-term persistence of these taxa.
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Peterson, Charles R., and Michael E. Dorcas. "The Use of Automated Data-Acquisition Techniques in Monitoring Amphibian and Reptile Populations." In Wildlife 2001: Populations, 369–78. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2868-1_30.

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Scott, Norman J., and Richard A. Seigel. "The Management of Amphibian and Reptile Populations: Species Priorities and Methodological and Theoretical Constraints." In Wildlife 2001: Populations, 343–68. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2868-1_29.

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Funk, W. Chris, Kelly R. Zamudio, and Andrew J. Crawford. "Advancing Understanding of Amphibian Evolution, Ecology, Behavior, and Conservation with Massively Parallel Sequencing." In Population Genomics, 211–54. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/13836_2018_61.

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Heyer, W. Ronald, and James B. Murphy. "Declining Amphibian Populations Task Force." In Amphibian Declines, 17–21. University of California Press, 2005. http://dx.doi.org/10.1525/california/9780520235922.003.0005.

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Patla, Debra. "Protecting Amphibians While Restoring Fish Populations." In Amphibian Declines, 275–76. University of California Press, 2005. http://dx.doi.org/10.1525/california/9780520235922.003.0039.

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"5. Declining Amphibian Populations Task Force." In Amphibian Declines, 17–21. University of California Press, 2019. http://dx.doi.org/10.1525/9780520929432-009.

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Conference papers on the topic "Amphibian populations"

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Cozari, Tudor. "Etologia ecologico-evolutiva a amfibienilor: sinteza conceptuala a rezultatelor investigatiilor la nivel regional si european." In Impactul antropic asupra calitatii mediului. Institute of Ecology and Geography, Republic of Moldova, 2019. http://dx.doi.org/10.53380/9789975330800.17.

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Following from long investigations of more than 50 populations of amphibians from the Republic of Moldova and Italy were elucidated ecological particularities and evolutionary reproductive behavior of some species of Caudata and Anura Orders. For the first time, on Autecological & Sinecological level, has been made assessment of nuptial systems of amphibians – of parental contribution, reproductive success, „r” & „K” reproductive strategies and their role in sexual selection and evolution the attainment of reproductive potential as a fundamental mechanism of survival of amphibian populations in various ambient conditions.
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Cozari, Tudor. "Ecological-evolutionary ethology of the amphibians: conceptual synthesis of research results at regional and European level." In Xth International Conference of Zoologists. Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/icz10.2021.51.

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Following long-term investigations of over 50 amphibian populations in the Republic of Moldova and Italy, the ecological and evolutionary peculiarities of reproductive behavior in some species of the orders Caudata and Anura were elucidated. For the first time, at the autecological and synecological level, the evaluation of amphibian nuptial systems - parental input, reproductive success, “r” and “K” reproductive strategies and their role in the evolution of sexual selection and the realization of the reproduction potential as a fundamental mechanism for the survival of amphibian populations in various environmental conditions was emphasized.
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Cozari, Tudor, and Elena Gherasim. "Comportamentul de reproducere al ranidelor verzi: analiză sintetică." In International symposium ”Functional ecology of animals” dedicated to the 70th anniversary from the birth of academician Ion Toderas. Institute of Zoology, Republic of Moldova, 2019. http://dx.doi.org/10.53937/9789975315975.06.

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Amphibians, represents a special study object for researchers because this are the first vertebrate animals that have conquered the dry land. Internationally, this study being analyzed from the most diverse points of view: morphological, physiological, systematic, phylogenetic, ecological, and so on, but nationally the research is incomplete. For this purpose, the authors carried out a complex study and deciphered the most complicated aspects of reproductive behavior of these vertebrate animals. The reproduction behavior of green frogs is one that evolved during their evolution and is one of the important components of the process of adaptation of amphibian populations to the conditions of the temperate environment of the Earth.
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Rinehart, Larry F., and Spencer G. Lucas. "Late Triassic Metoposaurid Amphibian Skull Allometry: Comparison of the Lamy, New Mexico, Population to Four Other Populations." In 2017 New Mexico Geological Society Annual Spring Meeting. Socorro, NM: New Mexico Geological Society, 2017. http://dx.doi.org/10.56577/sm-2017.501.

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Zhu, L., L. He, and A. Collier. "MAPIS: a mobile amphibian population information system." In International Conference on Information Technology: Coding and Computing (ITCC'05) - Volume II. IEEE, 2005. http://dx.doi.org/10.1109/itcc.2005.188.

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Adrović, Avdul, Edina Hajdarević, Alen Bajrić, and Ernad Kucalović. "BIODIVERZITET VODOZEMACA (KLASA: AMPHIBIA) SJEVEROISTOČNE BOSNE." In XXVII savetovanje o biotehnologiji. University of Kragujevac, Faculty of Agronomy, 2022. http://dx.doi.org/10.46793/sbt27.333a.

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The inventory of amphibians was conducted during 2020 and 2021 in the area of northeastern Bosnia. The conducted research determined 11 species of amphibians, of which three species belong to the tailed amphibians and the other eight to the tailless amphibians. Based on IUCN data, it can be concluded that these are the species with the least concern (LC) status. However, it is evident that the number of natural habitats of amphibians in the investigated area has been significantly reduced, and constant monitoring of the condition of their populations is necessary.
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Reports on the topic "Amphibian populations"

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Wolff, Patrick, Brett DeGregorio, and Aaron Rice. Demonstration of subsurface passive acoustic monitoring (SPAM) to survey for and estimate populations of imperiled underwater-calling frogs. Engineer Research and Development Center (U.S.), November 2021. http://dx.doi.org/10.21079/11681/42386.

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The management and recovery of threatened and endangered amphibians on Department of Defense (DoD) lands relies on an understanding of their distribution and abundance. Fortunately, most anuran species can be surveyed acoustically using vocalizations during the breeding season. This work demonstrated the use of subsurface passive acoustic monitoring (SPAM) to survey for rare underwater-calling, at-risk anuran species on DoD installations. We evaluated the performance of SPAM relative to traditional passive acoustic monitoring (PAM) (microphone) and human manual calling survey (MCS) methods. Results showed that SPAM outperformed PAM and MCS in validation experiments where calls were generated underwater; SPAM was less successful than PAM and MCS in the field demonstration. Most leopard frog calls were apparently produced in air despite previous reports of extensive underwater-calling behavior. This project highlights how acoustic information can help address a data gap in the ecology of at-risk species, which can help refine future survey methodology and management efforts. Ultimately, the utility of SPAM for underwater-calling species will depend on the focal species, the landscape where it occurs, and technological considerations available to the surveyor. SPAM is more expensive than traditional methods but, in some situations, may be the only way to effectively detect species.
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