Macroinvertebrate food web structure in a floodplain lake of the Bolivian Amazon |
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Authors: | Carlos I Molina François-Marie Gibon Thierry Oberdorff Eduardo Dominguez Julio Pinto Rubén Marín Marc Roulet |
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Institution: | 1.Instituto de Ecología, Unidad de Limnología, UMSA,La Paz,Bolivia;2.Institut de Recherche pour le Développement IRD,La Paz,Bolivia;3.CONICET—Instituto de Biología Neotropical (IBN), Facultad de Ciencias Naturales, Universidad Nacional de Tucumán,Tucumán,Argentina;4.UMR BOREA (IRD 207/CNRS 7208/MNHN/UPMC),Paris cedex 05,France |
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Abstract: | Two stable isotopes δ13C and δ15N were used to identify the energy sources and trophic relationships of the main freshwater macroinvertebrates in a floodplain
lake of the Beni River (Bolivian Amazonia). Four energy sources (seston, bottom sediment, periphyton, and aquatic macrophytes)
and macroinvertebrate communities were collected during three periods of the river hydrological cycle. Macroinvertebrates
showed greater temporal variation in isotope values than their food sources. Six trophic chains were identified: four were
based on seston, periphyton, C3 macrophytes, and bottom sediments, and the last two chains on a combination of two carbon sources. One mixed seston and periphyton
sources during the wet season while the other mixed periphyton and macrophytes sources during the wet and dry seasons. Periphyton
was the most important energy source supporting the highest number of trophic levels and consumers. The macrophytic contribution
was only significant during the dry season. Bottom sediments constituted a marginal energy source. As each season is associated
with different physical and chemical conditions, processes organizing macroinvertebrate food web structure in the Beni floodplain
seem strongly linked to hydrological seasonality. |
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