Izabella Cristina da Silva Penha, Antonio Augusto Jardim Jr., Erival Gonçalves Prata, Lidia Brasil Seabra, Rafael Rodrigues Gusmão, Giovanna Teixeira Ferreira, Ana Flavia do Vale Neves Machado Costa, Tiago Magalhães da Silva Freitas, Luciano Fogaça de Assis Montag
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引用次数: 0
Abstract
This study aimed to assess the trophic dynamics of a detritivorous species throughout various hydrological periods in a reduced flow section, Volta Grande, of the Xingu River. Specimens were collected between December 2020 and November 2021 using gill nets. Stomachs were dissected to examine their contents, and muscle tissue samples were collected for isotopic analyses of δ13C and δ15N. The diet across hydrological periods was analysed using permutational multivariate analysis of variance. Variation in trophic niche breadth was evaluated using permutational dispersion analysis with food importance values. Feeding intensity was evaluated using the repletion index, and its variation across periods was tested using Kruskal-Wallis. Isotopic structure across hydrological periods was evaluated through analysis of variance. Isotopic niche overlap was calculated using the corrected standard ellipse area metric. Mixed effect models were employed to estimate the contributions of basal resources assimilated by the species across periods. Our results revealed stable patterns in the diet and energy sources of the species across different hydrological periods. Given the escalating impact of human activities on natural seasonal variations in rivers, conducting detailed trophic studies and employing precise methods to reconstruct food webs and energy flow in altered aquatic ecosystems are essential. This information is crucial for guiding measures aimed at protecting and conserving these environments and the ichthyofauna reliant on them.
期刊介绍:
Aquatic Sciences – Research Across Boundaries publishes original research, overviews, and reviews dealing with aquatic systems (both freshwater and marine systems) and their boundaries, including the impact of human activities on these systems. The coverage ranges from molecular-level mechanistic studies to investigations at the whole ecosystem scale. Aquatic Sciences publishes articles presenting research across disciplinary and environmental boundaries, including studies examining interactions among geological, microbial, biological, chemical, physical, hydrological, and societal processes, as well as studies assessing land-water, air-water, benthic-pelagic, river-ocean, lentic-lotic, and groundwater-surface water interactions.