Feeding ecology of a detritivorous fish in controlled flood pulse area in the Amazon revealed by stomach content and stable isotopes analyses

IF 2 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
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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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.

通过胃内容物和稳定同位素分析揭示了亚马逊河控制洪水脉冲区一种营养鱼类的摄食生态
本研究旨在评估新古河大伏特河(Volta Grande)流量减少段不同水文时期一种营养物种的营养动态。在2020年12月至2021年11月期间使用刺网收集标本。解剖胃,检测胃内容物,采集肌肉组织样品,进行δ13C和δ15N同位素分析。采用多变量方差分析对不同水文时期的饮食进行了分析。利用食物重要值的排列分散分析评价了营养生态位宽度的变化。采食强度采用饱食指数评价,采食强度在不同时期的变化采用Kruskal-Wallis法测定。通过方差分析评估了各水文时期的同位素结构。采用校正后的标准椭圆面积度量法计算了同位素生态位重叠。采用混合效应模型估算了不同时期各树种吸收的基础资源的贡献。我们的研究结果揭示了该物种在不同水文时期的饮食和能量来源的稳定模式。鉴于人类活动对河流自然季节变化的影响不断升级,进行详细的营养研究并采用精确的方法在改变的水生生态系统中重建食物网和能量流至关重要。这些信息对于指导旨在保护和保存这些环境和依赖这些环境的鱼系动物的措施至关重要。
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来源期刊
Aquatic Sciences
Aquatic Sciences 环境科学-海洋与淡水生物学
CiteScore
3.90
自引率
4.20%
发文量
60
审稿时长
1 months
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.
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