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Role of food partitioning in structuring the zooplankton community in mountain lakes.
|Autor:||Guisande, C.; Bartumeus, Frederic ; Ventura, Marc ; Catalán, Jordi|
|Fecha de publicación:||2003|
|Citación:||Oecologia 136 : 627-634 (2003)|
|Resumen:||Trophic-niche differentiation is often cited as a main factor in structuring zooplankton assemblages, although field evidence for this is rarely presented. The study was based on a survey of 29 Pyrenean lakes with altitudes ranging between 1,875 and 2,990 m carried out during July and August 2000. Because of the oligotrophic nature of these lakes, we aimed to confirm that food partitioning is a major factor in shaping zooplankton assemblages. We analysed the amino acid composition of six cladocera and seven copepod species. A discriminant analysis showed that each species could be distinguished according to its amino acid composition. A negative relationship between amino acid differentiation and cooccurrence among the cladocera and cyclopoid copepod was observed. In contrast, calanoids did not show any relationship and were characterised by a high amino acid differentiation between species. As the differences in the amino acid composition among zooplankton species indicate distinct food sources, the relationship found indicates that trophic-niche differentiation plays a key role in determining the assemblage of these zooplankton communities. Therefore exploitative competition, either at present or in the past by driving co-evolutionary histories, has been a significant factor in structuring the cladocera and cyclopoid communities in these oligotrophic lakes.|
|Descripción:||8 páginas, 4 figuras, 4 tablas.|
|Versión del editor:||http://dx.doi.org/10.1007/s00442-003-1306-4|
|Aparece en las colecciones:||(CEAB) Artículos|
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