Modelling population dynamics of great crested newts (Triturus cristatus): A population viability analysis)

Griffiths, Richard A. and Williams, Clair (2000) Modelling population dynamics of great crested newts (Triturus cristatus): A population viability analysis). Herpetological Journal, 10 (4). pp. 157-163. ISSN 0268-0130. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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The effects of pond isolation, drought, habitat fragmentation and dispersal on populations of crested newts (Triturus cristatus) were investigated using stochastic models constructed from existing life history data. The models predict that small isolated populations have a higher risk of extinction than large isolated populations. However, even large populations had a relatively high extinction risk over a fifty year period if they remained isolated. Pond desiccation affects metamorphic success and recruitment, and the risk of extinction decreased with decreasing frequency of regional droughts. In a subdivided population, increasing dispersal between subpopulations decreased the extinction risk of the metapopulation as a whole. However, even in the absence of dispersal, a subdivided population had a lower overall extinction risk than a single isolated population of the same size. Environmental stochasticity may therefore result in asynchronous dynamics within subpopulations, which leads to the risk of extinction being spread across the subpopulations. Although population viability analysis has the potential to provide an objective assessment of population management decisions, it has not yet been a component of conservation planning for the crested newt in Britain.

Item Type: Article
Additional information: Conference Information: Symposium of the British-Herpetological-Society LONDON, ENGLAND, DEC 05, 1998 British Herpetol Soc
Uncontrolled keywords: Triturus cristatus; population viability analysis; metapopulation; modelling
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
G Geography. Anthropology. Recreation > GN Anthropology
Divisions: Faculties > Social Sciences > School of Anthropology and Conservation > DICE (Durrell Institute of Conservation and Ecology)
Depositing User: C.G.W.G. van-de-Benderskum
Date Deposited: 13 Nov 2008 15:48
Last Modified: 25 Jun 2014 13:11
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