No description available.

No description available.

No description available.

No description available.

No description available.

Vol. [2] comprises 6 reprints of published monographs in box folder; but numbered within the publications submitted listing (90 items), and within the 3 categories identified; at the beginning of vol. 1. Includes bibliographical references. [1]. Publications: The biology of frogs ; Systematics and nomenclature ; The fossil record of frogs -- [2]. Monographs Comprises 90 contributions to the biology and systematics of frogs, with particular emphasis upon those concerning the fauna of Australia and New Guinea. Provides an understanding of the state of knowledge when the author commenced his studies; permitting the extent of his work, an the nature of its significance, to be evaluated.

Vol. [2] comprises 6 reprints of published monographs in box folder; but numbered within the publications submitted listing (90 items), and within the 3 categories identified; at the beginning of vol. 1. / Includes bibliographical references. / 2 v. (various pagings) : / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Comprises 90 contributions to the biology and systematics of frogs, with particular emphasis upon those concerning the fauna of Australia and New Guinea. Provides an understanding of the state of knowledge when the author commenced his studies; permitting the extent of his work, an the nature of its significance, to be evaluated. / Thesis (D.Sc.)--University of Adelaide, Dept. of Environmental Biology, 2002

The most urgent amphibian conservation issue in the Upper Midwest has been Blanchard's cricket frog (Acris crepitans blanchardi) declines over much of their northern range. Several causes have been proposed to explain these declines, including pesticide applications, disease, habitat loss, and habitat modification. My goal was to explore these proposed causes. Using a combination of field and laboratory analyses, including population analyses, gross inspections for malformations, and a histopathological analysis for indicators of fungus, disease and parasites, I found evidence for disease (a viral infection) and stress (fluctuating asymmetry, malformations and parasitism). Interestingly, the population most affected by these factors was also the one that contained the most animals and was located south of the presumed decline front (i.e., was assumed to be healthy). / Department of Biology

Previously, amphibian malformations had only been studied at the site, state and regional levels, limiting our understanding of the types of malformations most commonly occurring in wild populations across the country. This study presents the results of radiographic analyses performed on morphologically abnormal amphibians collected from National Wildlife Refuges in 27 states and 6 of 7 US Fish and Wildlife Service regions. Despite considerable differences in species composition and ecological factors (e.g., habitat type, climate and land use), it was observed that abnormalities were remarkably similar across regions of the country. One regional difference that was noted was that higher proportions of forelimb and craniofacial abnormalities were observed in the western regions (regions 1 and 7) compared to the eastern ones. However, the uneven distribution of these abnormalities across sites, suggest that these elevated proportions may not be characteristic of region 1. Differences in species composition as well as in ecological factors such as habitat type and climate are potential explanations for this pattern in region 7. Given the known differences in regional causes, the results of this study suggest that these stressors may be affecting amphibian development in the same manner to produce primarily hindlimb reductions. Continued research comparing the types of abnormalities produced in different areas of the country as well as what stressors are present is essential to identify cause and affect relationships at sites hosting abnormal amphibians. / Department of Biology

Thesis (PhD.) -- University of Western Sydney, 2002. / "A thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy at the University of Western Sydney, Centre for Integrated Catchment Management". References : leaves 133 - 162.