文章基本信息

标题：Comparison of Two Populations of Silverside (Odontesthes bonariensis) in Eutrophic Lakes of Central Chile
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作者：F. Scasso ; H. Campos
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：1999
卷号：14
期号：1
页码：61-70
DOI：10.1080/02705060.1999.9663655
出版社：Taylor & Francis
摘要：The silverside (Odontesthes bonariensis), an introduced species, was studied in Laguna Grande of San Pedro (Laguna Grande) and Laguna Chica of San Pedro (Laguna Chica), both eutrophic lakes of the Biob o River basin in central Chile. The parameters analyzed were: biomass, production, length frequency, weight-length relationship, condition factor, age, and growth O. bonariensis, the most abundant fish species in the lakes, had high values of biomass and production, showing its adaptation to lakes of medium (Laguna Chica) and high (Laguna Grande) eutrophic status. Laguna Chica had greater biomass and production of silverside than Laguna Grande, confirming the hypothesis that the mesotrophic condition is more favorable than the highly eutrophic condition for certain species. In addition, the population of Laguna Chica reached an asymptotic length and a longevity that were greater than those of Laguna Grande. However, individuals of Laguna Grande were stoutter (better condition index), reflecting a higher availability of food in the eutrophic lake.