Tesis sobre el tema "Tadpoles"
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Sontag, Charles Robert. "Social foraging in Bufo Americanus tadpoles". Diss., Online access via UMI:, 2007.
Buscar texto completoHartigan, Ashlie. "Myxosporean Parasites in Australian Frogs and Tadpoles". Thesis, The University of Sydney, 2012. http://hdl.handle.net/2123/8900.
Texto completoCivill, Nicola Dawn. "Characterisation of a bagpipe homologue in Xenopus laevis". Thesis, University College London (University of London), 2000. http://discovery.ucl.ac.uk/1348859/.
Texto completoGibson, Jennifer C. W. "The effects of methylmercury ingestion on amphibian tadpoles". Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27137.
Texto completoHopkins, Samantha. "The ecology of tadpoles in a temporary pond in the Western Cape with comparisons to other habitats". Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5710_1210838039.
Texto completoThis work centered on the tadpoles in a temporaray pond in the middle of Kenilworth racecourse, Cape Town, South Africa. Trapping was carried out over two wet seasons and five species were found. The racecourse was selected to investigate the tadpole community occupying temporary winter pools. The main focus of this study was the community of tadpoles that occur in the ephemeral ponds in the centre of Kenilworth Racecourse. This study was a very broad insight into tadpole ecology in the Western Cape.
Boone, Michelle D. "Effects of an insecticide on amphibian communities /". free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9999275.
Texto completoKraft, Peter G. "The evolution of predator-induced phenotypic plasticity in tadpoles /". [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18434.pdf.
Texto completoJames, Lisa. "Initiation of motor responses in developing Xenopus Laevis tadpoles". Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503893.
Texto completoHe, Justin. "Delayed Developmental Loss of Regeneration in Xenopus laevis tadpoles". University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1618040083764443.
Texto completoNICOLOSI, MARCO. "Issues on tadpoles and vacuum redefinitions in String Theory". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2006. http://hdl.handle.net/2108/232.
Texto completo“Issues on tadpoles and vacuum redefinitions in String Theory” M. Nicolosi This Thesis is devoted to the problem of NS-NS tadpoles, bosonic one-point functions going into the vacuum that typically emerge in String Theory after supersymmetry breaking. These theories contain bosonic fields in two sectors, commonly denoted with NS-NS and R-R. While R-R tadpoles typically signal an inconsistency, like the presence of quantum anomalies in the case of a compact internal space, and thus in general must be cancelled, NS-NS tadpoles are associated to redefinitions of the background, as first stressed by Fischler and Susskind in the eighties. In particular, in Type I String Theory NS-NS tadpoles emerge already at the disk level and, from a space-time viewpoint, correspond to configurations of D-branes and orientifold planes with a non-vanishing tension giving rise to a net gravitational attraction that curves the background space-time. Up to now one is able to perform efficient string computations only in a flat Minkowski background, a case that is allowed and protected by supersymmetry. Hence, the (closed) infrared divergences emerging after supersymmetry breaking in string amplitudes, due to the propagation of NS-NS massless states that are absorbed by tadpoles at vanishing momentum, are just the signal that the flat Minkowski background is no more a vacuum of the theory. In this context our proposal is to keep quantizing the string around the Minkowski background, recovering the proper results after suitable tadpole resummations that cancel the infrared divergences. This procedure is still very difficult to carry out in String Theory, because the higher-order tadpole corrections correspond to Riemann surfaces of increasing genus, and efficient calculations can be only carried out up to genus one (one-loop amplitudes). Moreover, in most models that realize supersymmetry breaking, tadpoles arise already at the disk level, and thus, even in a perturbative region of small string coupling, the first tadpole corrections can be large. Hence, it is interesting to search for models with “small” tadpoles. Examples of this kind seem are provided by models with suitable internal fluxes, for which reliable perturbative results can be recovered just considering the first tadpole corrections. Another line that one can pursue is to search for quantities that are protected against the infrared divergences. An example of this kind is provided by the one-loop string corrections to gauge couplings, commonly known as threshold corrections, for supersymmetry breaking models with parallel branes, a case that we have widely discussed in this Thesis. The Thesis is organized in the following way. There is a general Introduction to String Theory, where we summarize the main ideas of the Theory, trying to underline its successes and its open problems. Then in the first Chapter we recall the basic properties of string spectra and discuss some simple examples of toroidal and orbifold compactifications. The second Chapter is devoted to reviewing a number of different mechanisms to break supersymmetry. In the third Chapter we begin to analyze our resummation program in a number of field theory toy models, trying to recover the right results, at least at the classical level, starting from a “wrong vacuum”. The cases of cubic and quartic potentials are simple and interesting, and display some general features concerning tadpole resummations and convergence domains around inflection points of the potential, where the tadpole expansion breaks down. Our analysis shows that, starting from an arbitrary initial value of the field, classical tadpole resummations typically drive the quantities we are computing towards an extremum of the potential, not necessary a minimum. In addition, for the case of a quartic potential we find some very special “non-renormalization” points for which all higher order tadpole corrections cancel. We then analyze our procedure for a sting-inspired toy model with tadpoles localized on lower dimensional D-branes, performing explicitly the resummations. We also consider the introduction of gravity, that should give further complications related to the graviton mass terms, but seems to not affect substantially our program, and indeed tadpole resummations prove still to work in this case. Finally, in Chapter four we begin to face the tadpole problem in String Theory itself. In the first Section, we describe an example where the vacuum redefinition can be understood not only at the level of the low energy effective field theory, but also at the full string theory level. In particular, we show that the vacuum of a Type II orientifold with a compact dimension and local tadpoles is a Type 0 orientifold without compact dimensions. These results are contained in a paper to appear in Nuclear Physics B. Finally, in the last Section we begin the analysis of one-loop threshold corrections in a number of models with supersymmetry breaking with parallel branes and no closed tachyons propagating in the bulk. The result is that the one-loop threshold corrections in all these cases are always (closed) infrared finite, in spite of the presence of NS-NS tadpoles. These computations will be included in a paper that is currently in preparation.
Hull, Michael James. "Initiation and maintenance of swimming in hatchling Xenopus laevis tadpoles". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8046.
Texto completoAsquith, Christopher. "Size-structured competition and predation in red-eyed treefrog tadpoles". VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/58.
Texto completoAdams, Michael J. "Experimental analysis of tadpole mortality factors : effects of bullfrogs and exotic fish in the Puget Lowlands, Washington /". Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/5507.
Texto completoWilliams, Bethany K. Semlitsch Raymond D. "A multi-scale investigation of ecologically relevant effects of agricultural runoff on amphibians". Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/6641.
Texto completoLarson, Peter M. "Chondrocranial evolution in Rana tadpoles integrating form, function, ontogeny, and phylogeny /". Ohio : Ohio University, 2003. http://www.ohiolink.edu/etd/view.cgi?ohiou1070556342.
Texto completoHero, Jean-Marc y n/a. "Predation, Palatability and the Distribution of Tadpoles in the Amazon Rainforest". Griffith University. Division of Australian Environmental Studies, 1991. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050902.155749.
Texto completoBarribeau, Seth. "Environmental, social, and genetic factors predisposing Xenopus laevis tadpoles to infection". Thesis, University of Canterbury. Biological Sciences, 2007. http://hdl.handle.net/10092/1868.
Texto completoHowson, Paddy. "Excitation, and the maintenance of swimming in hatchling Xenopus laevis tadpoles". Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313079.
Texto completoLarson, Peter. "Chondrocranial Evolution in Rana Tadpoles: Integrating Form, Function, Ontogeny, and Phylogeny". Ohio University / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1070556342.
Texto completoMills, Nathan E. "Direct and indirect effects of an insecticide on Rana sphenocephala tadpoles /". free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3052201.
Texto completoHero, Jean-Marc. "Predation, Palatability and the Distribution of Tadpoles in the Amazon Rainforest". Thesis, Griffith University, 1991. http://hdl.handle.net/10072/366814.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Division of Australian Environmental Studies
Science, Environment, Engineering and Technology
Full Text
Griggs, Jennifer Lynn. "Effects of Atrazine and Metolachlor on Snails, Tadpoles, and Their Trematode Parasites". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/36122.
Texto completoMaster of Science
Villinger, Jandouwe. "Kin recognition and MHC discrimination in African clawed frog (Xenopus laevis) tadpoles". Thesis, University of Canterbury. School of Biological Sciences, 2007. http://hdl.handle.net/10092/2149.
Texto completoNicolle, Philip David. "The environmental physiology of Bufo bufo L. and Bufo calamita Laur. tadpoles". Thesis, Liverpool John Moores University, 1989. http://researchonline.ljmu.ac.uk/4987/.
Texto completoSchneider, Katelin A. "Molecular Characterization and Endocrine Regulation of Development in Tadpoles of Xenopus Tropicalis". University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511858507180701.
Texto completoHernandez, P. Chalcraft David. "Priority effects of overwintered Rana tadpoles on larval Southern toad (Bufo terrestris Bonnaterre)". [Greenville, N.C.] : East Carolina University, 2010. http://hdl.handle.net/10342/2726.
Texto completoDavidson, Melissa Anne. "Fate and developmental effects of dietary uptake of methylmercury in Xenopus tropicalis tadpoles". Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27676.
Texto completoLambert, Thomas. "A role for inhibition in controlling long term responsiveness in young frog tadpoles". Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251552.
Texto completoKitson, Sarah R. "Upland forest leaf litter: Effects on growth and development of Lithobates sylvaticus tadpoles". Kent State University Honors College / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1367944142.
Texto completoEmery, David. "ASSESSING THE GENOTOXICITY OF TRICLOSAN IN TADPOLES OF THE AMERICAN BULLFROG, LITHOBATES CATESBEIANUS". VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/345.
Texto completoRybitski, Mary J. "Effects of polychlorinated biphenyl exposure on development and sexual differentiation in ranid tadpoles". W&M ScholarWorks, 2000. https://scholarworks.wm.edu/etd/1539616835.
Texto completoRedick, Melinda. "Effects of Sublethal Copper Exposure on Escape Behavior and Growth of Rana pipiens Tadpoles". Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3119/.
Texto completoRyerson, William G. "The role of abiotic and biotic factors in suspension feeding mechanics of Xenopus tadpoles". [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002790.
Texto completoRugenski, Amanda T. "INFLUENCES OF DISEASE-DRIVEN AMPHIBIAN DECLINES ON ECOSYSTEM STRUCTURE AND FUNCTION IN PANAMANIAN HEADWATER STREAMS". OpenSIUC, 2013. https://opensiuc.lib.siu.edu/dissertations/789.
Texto completoWarren, Alice Gabrielle. "Environmental effects on the growth and development of Xenopus Laevis tadpoles: towards improved laboratory welfare". Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492448.
Texto completoCurrie, Stephen Paul. "The development and neuromodulation of motor control systems in pro-metamorphic Xenopus laevis frog tadpoles". Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/10199.
Texto completoCurtis, Amanda N. "Non-target Impacts of Chemical Management for Invasive Plants on Lithobates Pipiens Tadpoles". Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1416525356.
Texto completoVasconcelos, Ana Maria. "Avaliação dos efeitos do agrotóxico Vertimec® 18CE sobre girinos de Lithobates catesbeianus (Amphibia, Anura, Ranidae)". Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-27062014-120117/.
Texto completoThe intervention of anthropogenic activities to the environment has reflected in the structure and functions of ecosystems and the use of chemical additives, such as pesticides and fertilizers, has contributed for the disequilibrium. The Vertimec® 18EC, whose toxicity is described to different taxa, is widely used in agricultural crops, and it has been known about the intense handling practices, often irregular, which can reach higher concentrations than those expected in the aquatic environment. One group that has been highlighted in recent years by the increasing decline associated with the use of these products is the amphibians. Amphibians plays a central role in the food chain and several studies have related the ecological disequilibrium caused by the decline of this group due to the addition of contaminants, including pesticides. In this study, laboratory bioassays were developed to determine the more susceptible stage and the LC50,96h of Lithobates catesbeianus to Vertimec® 18EC. From these results, in situ experiments (mesocosms) were conducted with tadpoles in more advanced stage (25 of Gosner table) in order to compare the differences in toxicity of Vertimec® 18EC when manipulated both in field and in laboratory. Also, the effects caused by a single and multiple application of the pesticides were evaluated. The laboratorial results showed that earlier stages (21G) were more sensitive than more developing tadpoles (25G), and the effects of the pesticide were more aggressive under natural conditions (mesocoms), with 100% of mortality before 24 hours, at the same developmental stage. The results of laboratorial and in situ bioassays indicated that the lower concentration (0.002 ml Vertimec.L-1) didn\'t cause mortality, but alterations on development stage and larval period time were observed, indicating indirect effects (available resources) on the success of this species. On the other hand, no difference was found between the single and multiple applications of Vertimec® 18EC because all organisms died in the unique dosage treatment, but it was possible to verify limnological alterations after the second application of the pesticide. Considering the results obtained we conclude that Vertimec® 18EC can affect directly (mortality, development stages and behavior) and indirectly (food reduction) the population of Lithobates catesbeianus, contributing to the decline of amphibians in the natural systems.
Souza, Franciele Cristina de [UNESP]. "Parasitas de larvas e adultos de três espécies de anuros associados a poças temporárias e permanentes na Reserva Florestal Ducke, Amazônia Central". Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150450.
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Fundação de Amparo à Pesquisa do Estado do Amazonas (FAPEAM)
O presente estudo analisou a fauna parasitária de três espécies de anuros desde a fase larval até a adulta, Hypsiboas cinerascens, Hypsiboas geographicus e Rhinella marina da Reserva Florestal Ducke, Amazônia Central. A fauna de parasitas de anuros da região é pouco conhecida, sendo a fase larval a menos estudada. Os dados analisados durante os dois anos de coleta demonstraram que espécies parasitas diferem nas duas fases de vida dos anfíbios anuros. Foram analisados um total de 224 girinos, e 38 indivíduos adultos, em três áreas de amostragem diferentes: poças temporárias, poça permanente, e uma lagoa da reserva. Um total de 827 parasitas foi encontradonosgirinos, e 3.534 nos adultos. Nas fases larvais foram encontrados nematoidespertencentes à espécie Gyrinicola chabaudi, metacercárias de trematódeos de Diplostomídeos e protozoários do gênero Nyctotherus. Nos adultos, a riqueza parasitária foi maior: nestes foram encontrados nematoides, trematódeos, acantocéfalos, carrapatos e larvas de Diptera. As fases larvais das espécies de anuros aqui estudados, representam novos registros de hospedeiros para o nematoide Gyrinicola chabaudi, ampliando o conhecimento de sua distribuição geográfica. Com os dados obtidos, podemos compreender que a riqueza entre as duas fases de desenvolvimento dos anuros são bem distintas. Durante o processo de metamorfose até a fase adulta o animal transporta grupos de parasitas, conectando-os entre o ambiente aquático e o ambiente terrestre. Este trabalho é o primeiro, até o momento, que descreve este tipo de interação na região, contribuindo assim com o aumento de registro de novas informações sobre estudos parasitológicos na Amazônia.
The present study analyzed the parasitic fauna of three species of anurans from the larval to adult phase, Hypsiboas cinerascens, Hypsiboas geographicus, and Rhinella marina of the Ducke Forest Reserve, Central Amazonia. The anurans parasitic’ fauna of the region is little known, being the larval stage less studied. The data analyzed during two years of collection showed that parasite species differ in two life stages of anuran amphibians.A total of 224 tadpoles, and 38 adult individuals, were analyzed in three different sampling areas, temporary pools, permanent pond, and one reserve pond. A total of 827 parasites were found in tadpoles, and 3,534 in adults. In the larval stages nematodes belonging to the species Gyrinicola chabaudi, metacercariae of trematodes of the family Diplostomidae, and protozoa of the genus Nyctotherus sp. In adults, parasite diversity was higher: in these were found nematodes, trematodes, acantocephalus, ticks, and larvae of Diptera. Larval phases of the anuran species studied here represent new host register for the Gyrinicola chabaudi nematode, increasing the knowledge of its geographical distribution.With obtained data we can understand that diversity and richness between the two stages of anuran development are very different. During the process of metamorphosis to adulthood the animal carries groups of parasites, connecting them between the aquatic environment and terrestrial environment. This work is the first, to date, which describes this type of interaction in the region, thus contributing to the increase in the registration of new information on parasitological studies in the Amazon.
Souza, Franciele Cristina de. "Parasitas de larvas e adultos de três espécies de anuros associados a poças temporárias e permanentes na Reserva Florestal Ducke, Amazônia Central". Botucatu, 2017. http://hdl.handle.net/11449/150450.
Texto completoResumo: O presente estudo analisou a fauna parasitária de três espécies de anuros desde a fase larval até a adulta, Hypsiboas cinerascens, Hypsiboas geographicus e Rhinella marina da Reserva Florestal Ducke, Amazônia Central. A fauna de parasitas de anuros da região é pouco conhecida, sendo a fase larval a menos estudada. Os dados analisados durante os dois anos de coleta demonstraram que espécies parasitas diferem nas duas fases de vida dos anfíbios anuros. Foram analisados um total de 224 girinos, e 38 indivíduos adultos, em três áreas de amostragem diferentes: poças temporárias, poça permanente, e uma lagoa da reserva. Um total de 827 parasitas foi encontradonosgirinos, e 3.534 nos adultos. Nas fases larvais foram encontrados nematoidespertencentes à espécie Gyrinicola chabaudi, metacercárias de trematódeos de Diplostomídeos e protozoários do gênero Nyctotherus. Nos adultos, a riqueza parasitária foi maior: nestes foram encontrados nematoides, trematódeos, acantocéfalos, carrapatos e larvas de Diptera. As fases larvais das espécies de anuros aqui estudados, representam novos registros de hospedeiros para o nematoide Gyrinicola chabaudi, ampliando o conhecimento de sua distribuição geográfica. Com os dados obtidos, podemos compreender que a riqueza entre as duas fases de desenvolvimento dos anuros são bem distintas. Durante o processo de metamorfose até a fase adulta o animal transporta grupos de parasitas, conectando-os entre o ambiente aquático e o ambiente terrestre. Este traba... (Resumo completo, clicar acesso eletrônico abaixo)
Mestre
Kruger, David Johannes Donnavan. "Tadpole morphology of high altitude frogs from the Drakensberg mountains / D.J.D. Kruger". Thesis, North-West University, 2010. http://hdl.handle.net/10394/4464.
Texto completoThesis (M.Sc. (Environmental Science))--North-West University, Potchefstroom Campus, 2011.
Gomes, Felipe Bittioli Rodrigues. "Uso de habitats e ecomorfologia de girinos na Serra da Mantiqueira, SP /". São José do Rio Preto : [s.n.], 2009. http://hdl.handle.net/11449/87638.
Texto completoAbstract: Tadpoles are considered a good model to understand community structure because they use several types of habitats and are relatively abundant. The body shape of tadpoles varies greatly according to the habitat type, and studies in ecomorphology can link body features to the habitat occupation. In this study we selected nine water bodies - three permanent ponds, three permanent streams and three temporary puddles - in the Parque Estadual de Campos de Jordão (PECJ), São Paulo State, southeast Brazil. The PECJ is situated in the Atlantic Rain Forest, and it is characterized by Floresta de Araucária (Araucaria angustifolia), Floresta Latifoliada de Encosta Atlântica and Campos de Altitude. The richness, abundance, diversity and spatial and seasonal occurrences of the species were determined in each habitat, through the samplings, accomplished with deep nets. The structure of the water bodies was determined using 12 environmental descriptors. Tadpoles of 17 species, belonging to eight families, were recorded, being Hylidae the most representative in richness and total abundance. The great species richness was recorded in permanent ponds. Temporary puddles and streams showed the same richness (5 species). Most of the species were specialist to water body type (streams, temporary puddles and permanent ponds) and to habitat use (each water body), did not preventing/avoiding the high overlap in the habitat use for 88% of the 17 recorded species. However, the high overlap occurred among the species belonging to the same guild of specialists for each type of water body. The species of different guilds showed low overlap in habitat use and, corresponding to that, the species composition reflected the three types of sampled water bodies. The flow and duration of the water, the size and the depth of water bodies influenced greatly the tadpoles' spatial distribution. From the 16...(Complete abstract click electronic access below)
Orientador: Denise de Cerqueira Rossa Feres
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Banca: Arif Cais
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Mestre
Moeun, Brian. "Toxicokinetics and Bioaccumulation of Metals in Wood Frog Tadpoles (Lithobates sylvaticus) Exposed to Sediment Near Oil Sands Mining in Northern Alberta". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38156.
Texto completoWeir, Scott. "Mercury concentrations in wetlands associated with coal-fired power plants in Illinois". OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/540.
Texto completoGarcia, Jessica. "The Effects of Microcystin from Harmful Algal Blooms on the Immune Functioning of Aquatic Turtles and Tadpoles". University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo154720353177829.
Texto completoLangan, Esther M. "Sublethal effects of sodium nitrate on developmental rate and body length in Southern Toad (Bufo terrestris) tadpoles". [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000863.
Texto completoRubio, Andrew Otto. "EFFECTS OF THE FUNGAL PATHOGEN BATRACHOCHYTRIUM DENDROBATIDIS ON THE TROPHIC ECOLOGY OF TADPOLES OF ANDEAN WATER FROGS". OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2599.
Texto completoManzini, Ivan. "Diversity of transduction mechanisms in receptor neurons of the main olfactory epithelium in Xenopus laevis tadpoles". Doctoral thesis, [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=975110926.
Texto completoLiu, Xuefeng. "Role of PKMz in morphological and synaptic development of optic tectal neurons in Xenopus laevis tadpoles in vivo". Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/28820.
Texto completoLybarger, Hollie R. "Detection of Heavy Metals in Rocky Mountain Tailed Frog (Ascaphus montanus) Tadpoles near Abandoned Mines in Northern Idaho". Thesis, Southern Illinois University at Edwardsville, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1557838.
Texto completoAmphibians are important bioindicators in environmental assessment. This highly diverse group of vertebrates is experiencing unprecedented declines worldwide due to a complex array of factors, including disease, habitat loss, invasive species, and environmental pollution. Heavy metals are especially problematic due to their persistence and ability to present a localized hazard even at sublethal levels. Northern Idaho has a long history of mining activity, and many watersheds have experienced heavy metal contamination. These streams contain many sensitive species, including the Rocky Mountain Tailed Frog, (Ascaphus montanus). While tailed frog populations are known to be especially vulnerable to logging and road building, the effects of local mining have not been documented. In order to assess the vulnerability of this species to heavy metal contamination, tadpoles were collected from three distinct populations across the Idaho Panhandle National Forest. Two sampling sites (Gold Creek and Beauty Creek) were characterized by abandoned mines in the headwaters of the streams, while a stream absent of any local historic mining (Bumblebee Creek) served as a reference site. Whole tadpoles were pooled and treated using EPA Method 3050B and analyzed for dissolved metal concentration (ug/g) using ICP-MS. We found the average metal concentrations in tadpoles (ug/g) at mining sites were generally higher than the reference site. Cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn) were significantly higher in tadpoles at Gold Creek when compared with the reference site. These results are consistent with other studies indicating metals from historic mining activity are still evident in these stream communities.