an ordination technique for fish diet comparisons
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2000
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Abstract
The frequency of nine food types in the guts of 58 fish species from the Paraná River and its floodplain was compared using similarity definition. A synthetic table ordered on the basis of this definition, with fish species on axis y, and food types on axis x, enabled easy reading numerous kinds of information on feeding ecology of fish in the catchment. For example: 1) which fish species were generalists, specialists or opportunists, 2) those classified as herbivorous species consumed small amounts of animal food, 3) that fish consumed any food type that contained transformed solar energy and matter, 4) what are food preferences dependent on fish taxonomic affinity. The possibility of employing synthetic tables for investigating spatial and temporal variation in fish diet has also been indicated.As freqĂĽĂŞncia de ocorrĂŞncia de nove tipos de itens alimentares em estĂ´magos de 58 espĂ©cies de peixes do rio Paraná e sua planĂcie alagável sĂŁo comparadas com base nas definições de similaridade. É proposta uma tabela sintĂ©tica baseada nessas definições, com as espĂ©cies de peixes no eixo y e os tipos de alimento no eixo x, permitindo uma visualização mais clara de diversos tipos de informações sobre a ecologia alimentar de peixes na bacia. Entre as informações, destacam-se (i) quais espĂ©cies sĂŁo generalistas, especialistas ou oportunistas; (ii) que espĂ©cies classificadas como herbĂvoras consomem tambĂ©m itens de origem animal; (iii) que os peixes consomem qualquer tipo de alimento que contenha energia; (iv) que a preferĂŞncia alimentar depende das afinidades taxonĂ´micas. A possibilidade de empregar tabelas sintĂ©ticas na investigação de variações espaciais e temporais na dieta de peixe Ă© tambĂ©m indicada.
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Authors | ;Tadeusz Penczak;Angelo A. Agostinho;Norma S. Hahn |
Journal | current drug delivery |
Year | 2000 |
DOI | 10.1590/S1516-89132000000100013 |
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