Conservation Biology of Caecilian Amphibians

Abstract:  Most of the available data on declining populations of amphibians pertain to frogs and, to a lesser extent, salamanders. In keeping with their generally less understood biology, the population trends and conservation status of caecilian amphibians (Gymnophiona) are also much less known. We reviewed reports of threats to and declines of populations of caecilians. Despite a lack of field-study details (e.g., localities, dates, and sampling methods) and quantitative data, there are several recent reports of threats to and declines and extinctions of caecilians. A range of causal explanations (habitat loss, pollution, chytridiomycosis, and scientific collecting) for these perceived declines have been proposed but little or no associated evidence has been given. Although caecilians are often considered rare and thought to require pristine habitat, published, quantitative data demonstrate that at least some species can occur in high abundance in disturbed, synanthropic environments. Few estimates of caecilian population parameters have been made and very few field methods have been tested, so the assumed rarity of any taxa remains inadequately demonstrated. Distribution and taxonomic data are also inadequate. Because they are generally poorly known and often cryptic, caecilians can be overlooked in standard faunal surveys, meaning that lack of opportunistic collection over several years might not represent evidence of decline. The conservation status of most species must be considered data deficient. More precise assessments will require a substantial increase in all areas of caecilian research, especially those involving new fieldwork. Future reports of caecilian conservation biology need to be explicit and more quantitative.     

Conservation Biology in Historical Perspective

Book reviewed in this article:
The American Conservation Movement: John Muir and His Legacy . Fox, S.
Aldo Leopold: His Life and Work. Meine, C.
An Overview of Biodiversity
Biodiversity. Wilson, E. O., editor.
Value of Biodiversity
Why Preserve Natural Variety? Norton, B.G.
Management of Common Property Resources
Proceedings of the Conference on Common Property Resource Management. Panel on Common Property Resource Management (Bromley, D. W., chair).
Conservation and Management of Bird Populations
The Pheasant: Ecology, Management and Conservation. Hill, D., and Robertson, P.
Ecology and Conservation of Grassland Birds. Goriup, P. D., editor.
Mammal Populations
Mammal Populations Mammal Population Studies. Harris, S., editor.
Taking a Stand for Forests
Last Stand of the Red Spruce . Mello, R. A.