Simplified food webs lead to energetic bottlenecks in polluted lakes
| العنوان: | Simplified food webs lead to energetic bottlenecks in polluted lakes |
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| المؤلفون: | Jennifer Kovecses, Joseph B. Rasmussen, Alice Hontela, Graham D Sherwood |
| المصدر: | Canadian Journal of Fisheries and Aquatic Sciences. 59:1-5 |
| بيانات النشر: | Canadian Science Publishing, 2002. |
| سنة النشر: | 2002 |
| مصطلحات موضوعية: | Lead (geology), Ecology, Energy flow, Animal activity, L-Lactate dehydrogenase, Natural ecosystem, Aquatic Science, Biology, Water pollution, Ecology, Evolution, Behavior and Systematics, Trophic level |
| الوصف: | Very little is known about the consequence of human activities on the flow of energy through natural ecosystems. Here, we present a trophic-based approach to describing energy relationships in pollutant-disturbed lakes, emphasizing the importance of prey diversity in maintaining energy transfer to growing fish. Both diet and community analysis indicated that the food web leading to yellow perch (Perca flavescens) in metal-polluted lakes was extremely simplified compared with reference lakes. Through the application of an in situ marker for fish activity costs (muscle lactate dehydrogenase activity) and through bioenergetic modelling, we show how this has severe consequences on the efficiency of energy transfer to perch from their prey; premature energetic bottlenecks (zero conversion efficiency) occur when successively larger prey types are not available to growing perch. These observations provide a much needed ecological and physiological framework for assessing how energy transfer can be affected in polluted systems. Our approach need not be limited therein but should be applicable to any aquatic system where food web structure is variable and (or) disrupted. |
| تدمد: | 1205-7533 0706-652X |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::471da9acde2c491a4acc082470e4c4ecTest https://doi.org/10.1139/f01-213Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi...........471da9acde2c491a4acc082470e4c4ec |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 12057533 0706652X |
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