دورية أكاديمية
Modelling the extinction risk of isolated populations of natterjack toad Bufo calamita
العنوان: | Modelling the extinction risk of isolated populations of natterjack toad Bufo calamita |
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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 |
تدمد: | 21933081 13991183 |
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DOI: | 10.5194/we-2-47-2001 |