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Modelling the extinction risk of isolated populations of natterjack toad Bufo calamita

التفاصيل البيبلوغرافية
العنوان: Modelling the extinction risk of isolated populations of natterjack toad Bufo calamita
المؤلفون: F. Meyer, W.-R. Grosse, K. Ulbrich, T. Stephan
المصدر: Web Ecology, Vol 2, Iss 1, Pp 47-56 (2001)
بيانات النشر: Copernicus Publications, 2001.
سنة النشر: 2001
المجموعة: LCC:Human ecology. Anthropogeography
LCC:Environmental sciences
LCC:Oceanography
LCC:Science
LCC:Biology (General)
LCC:Ecology
LCC:Microbiology
LCC:Physiology
LCC:Natural history (General)
LCC:General. Including nature conservation, geographical distribution
LCC:Zoology
LCC:Botany
مصطلحات موضوعية: Human ecology. Anthropogeography, GF1-900, Environmental sciences, GE1-350, Oceanography, GC1-1581, Science, Biology (General), QH301-705.5, Ecology, QH540-549.5, Microbiology, QR1-502, Physiology, QP1-981, Natural history (General), QH1-278.5, General. Including nature conservation, geographical distribution, QH1-199.5, Zoology, QL1-991, Botany, QK1-989
الوصف: Many local populations of the natterjack toad Bufo calamita in Germany are endangered. Due to the fragmentation and destruction of natural habitats by man, toads have often been forced to switch to secondary habitats. The permanent existence of these habitats is uncertain. Habitat and area requirements have been investigated in various parts of Germany in recent years. Our study uses field observations from sites in Halle (Saxony-Anhalt) and List (Schleswig-Holstein) as a basis for analyses of the population dynamics under different environmental conditions. Deterministic trends of these populations are calculated with the help of a Leslie matrix consisting of average parameters for mortality and reproduction. For a more thorough analysis we use a stochastic simulation model in order to assess survival probabilities of local toad populations. This model also takes into account environmental fluctuations affecting mortality and reproduction. Using scenarios from different locations, a sensitivity analysis of the parameters indicates which management options are the most promising to preserve a population. Our results indicate that the mortality rates of juveniles and the availability of spawning ground have the greatest influence on a population’s survival. Consequently, habitat management should focus on these aspects. In addition, we investigate the risk of extinction for different reproductive strategies. Natterjack toad populations observed in the field actually follow a strategy with three breeding periods. We find that this strategy supports the survival of the population better than strategies with less periods, which are more likely to result in a complete breeding failure during one season.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2193-3081
1399-1183
Relation: http://www.web-ecol.net/2/47/2001/we-2-47-2001.pdf; https://doaj.org/toc/2193-3081; https://doaj.org/toc/1399-1183
DOI: 10.5194/we-2-47-2001
URL الوصول: https://doaj.org/article/bcd962d73b79453cac176cf31e224fe9
رقم الأكسشن: edsdoj.bcd962d73b79453cac176cf31e224fe9
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:21933081
13991183
DOI:10.5194/we-2-47-2001