River dolphins can act as population trend indicators in degraded freshwater systems
| العنوان: | River dolphins can act as population trend indicators in degraded freshwater systems |
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| المؤلفون: | Samuel T. Turvey, Wang Ding, Hao Yujiang, Leigh A. Barrett, Claire Risley |
| المصدر: | PLoS ONE, Vol 7, Iss 5, p e37902 (2012) PLoS ONE |
| بيانات النشر: | Public Library of Science (PLoS), 2012. |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | Population Dynamics, Biodiversity, Marine and Aquatic Sciences, lcsh:Medicine, Fresh Water, Social and Behavioral Sciences, Marine Conservation, Sociology, Paddlefish, lcsh:Science, Conservation Science, Apex predator, Freshwater Ecology, education.field_of_study, Ecosystem health, Social Research, Multidisciplinary, Ecology, Mammalogy, Research Article, China, Conservation of Natural Resources, Food Chain, Dolphins, Population, Ecological and Environmental Phenomena, Marine Biology, Biology, Ecosystems, Rivers, Animals, Ecosystem, education, Species Extinction, Population Biology, lcsh:R, biology.organism_classification, Threatened species, Linear Models, Bioindicators, Earth Sciences, lcsh:Q, Population Ecology, Species richness, Zoology, Environmental Protection |
| الوصف: | Conservation attention on charismatic large vertebrates such as dolphins is often supported by the suggestion that these species represent surrogates for wider biodiversity, or act as indicators of ecosystem health. However, their capacity to act as indicators of patterns or trends in regional biodiversity has rarely been tested. An extensive new dataset of >300 last-sighting records for the Yangtze River dolphin or baiji and two formerly economically important fishes, the Yangtze paddlefish and Reeves’ shad, all of which are probably now extinct in the Yangtze, was collected during an interview survey of fishing communities across the middle-lower Yangtze drainage. Untransformed last-sighting date frequency distributions for these species show similar decline curves over time, and the linear gradients of transformed last-sighting date series are not significantly different from each other, demonstrating that these species experienced correlated population declines in both timing and rate of decline. Whereas species may be expected to respond differently at the population level even in highly degraded ecosystems, highly vulnerable (e.g. migratory) species can therefore display very similar responses to extrinsic threats, even if they represent otherwise very different taxonomic, biological and ecological groupings. Monitoring the status of river dolphins or other megafauna therefore has the potential to provide wider information on the status of other threatened components of sympatric freshwater biotas, and so represents a potentially important monitoring tool for conservation management. We also show that interview surveys can provide robust quantitative data on relative population dynamics of different species. |
| اللغة: | English |
| تدمد: | 1932-6203 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c7981c6acc35fa0503c9db4132756dc http://europepmc.org/articles/PMC3362568?pdf=render |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....4c7981c6acc35fa0503c9db4132756dc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19326203 |
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