Trophic Fish Structure Along the Beaches of The Brazilian Amazon River

Purpose: This study analyzes fish communities' diet and trophic structure on beaches along the Amazon River.   Methods: 41 beaches were studied, and fish were collected with 12x3m trawl nets and 5mm mesh between nodes. The stomachs were analyzed using the frequency of occurrence and points meth...

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Bibliographic Details
Published in:RGSA : Revista de Gestão Social e Ambiental 2024-05, Vol.18 (2), p.e04993-17
Main Authors: Claro Júnior, Luiz Henrique, Zuanon, Jansen, Ferreira, Efrem, Moreira, Elizany Monteiro, Nascimento-e-Silva, Daniel
Format: Article
Language:English
Subjects:
Abundance
Algae
Beaches
Diet
Ecological studies
Fish
Floodplains
Food
Herbivores
Invertebrates
Regression analysis
Rivers
Species richness
Stomach
Water quality
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Summary:Purpose: This study analyzes fish communities' diet and trophic structure on beaches along the Amazon River.   Methods: 41 beaches were studied, and fish were collected with 12x3m trawl nets and 5mm mesh between nodes. The stomachs were analyzed using the frequency of occurrence and points method. The dietary index was calculated using the preponderance index (PI). Using IP values, the following trophic categories were established: detritivore, hematophagous, herbivorous, benthic invertivore, pelagic invertivore, terrestrial invertivore, scavenger, and piscivore. Species richness and abundance of fish in trophic categories were related to the longitudinal variation of the sampled sites through linear regression 1,166 stomachs from 119 species were analyzed.   Results and discussion: The abundance and richness of detritivore species and the richness of scavengers showed a negative relationship throughout the floodplain, while the number of aquatic invertivore species showed a positive relationship.   Implications of the research: The existing differences in beach water quality create a longitudinal conductivity gradient, transparency, and suspended material, gradually altering the environment and composition of the ichthyofauna and the trophic structure along the Amazon River.   Originality/value: Ecological studies relating the trophic structure of fish to a large-scale longitudinal gradient are scarce in the Amazon River floodplain, which makes this article an essential piece for better understanding Amazonian systems by characterizing the trophic structure of fish from beaches in a longitudinal gradient of the Amazon River in Brazilian territory.
ISSN:1981-982X
1981-982X
DOI:10.24857/rgsa.v18n2-053