Dietary-morphological relationships in a fish assemblage of the Bolivian Amazonian floodplain

作者：Pouilly M^*; Lino F; Bretenoux JG; Rosales C

来源：Journal of Fish Biology, 2003, 62(5): 1137-1158.

DOI：10.1046/j.1095-8649.2003.00108.x

• Bolivia
• diet
• ecomorphology
• river floodplain
• tropical freshwater fishes

Morphological correlates of diet were examined in 48 species of freshwater fishes front floodplain lakes in the central part of the Mamore River (Bolivian Amazon). The species were classified, according to the percentage occurrence of seven food items, into eight broad trophic categories: mud feeders, algivores, herbivores. terrestrial invertivores and omnivores, carnivores. zooplanktivores. aquatic invertivores and piscivores. There were significant relationships between the diet and morphology of the fishes even when the effect of taxonomical relatedness between species was eliminated. Relative gut length was the main morphological variable used to order species oil a carnivore to Mud feeder gradient. Standard length and head and mouth size were the morphological variables most closely associated with prey size. Mud feeder, algivore and piscivore species appeared as the most dietary and morphologically 9 specialized. These results support both the hypotheses that species morphology influences the diet and that morphological similarity is conserved even in comparison with taxonomically unrelated species.

• 出版日期2003-5