Unravelling a specialised diet of an Amazonian catfish in a controlled flood-pulse area by combining stomach-content and stable-isotope analyses

IF 1.8 4区环境科学与生态学 Q2 FISHERIES

Marine and Freshwater Research Pub Date : 2024-04-12 DOI:10.1071/mf23039

Izabella Cristina da Silva Penha, Lidia Brasil Seabra, Erival Gonçalves Prata, Tiago Magalhães da Silva Freitas, Luciano Fogaça de Assis Montag

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引用次数: 0

Abstract

Context

Hydrological dynamics are crucial in fish ecology.

Aims

To evaluate the effect of the flood pulse on the feeding ecology of Doras higuchii in the reduced-flow section of the Belo Monte dam, Xingu River, Brazil.

Methods

Collections were conducted between December 2020 and November 2021. The fish were measured and had their stomachs removed. Muscle tissue was also extracted for stable-isotope analysis. Stomach contents were inspected to assess diet, testing the influence of hydrological periods by using GLM. In addition, we evaluated the effect of the flood pulse on the δ¹³C and isotopic ratios of individuals

Results

In total, 362 specimens of D. higuchii were analysed, highlighting a diet mainly on the basis of sediment (74.9%) and aquatic insects (24.8%), not varying between periods characterising the species as a specialist for having detritivorous habit, as well as the extension of the trophic niche. There was variation in food intensity, with higher average food consumption in the flood period. The isotopic composition (δ¹³C and δ¹⁵N) also did not differ between periods. Finally, δ¹⁵N did not vary by length class.

Conclusions

This information helps understand the interface between environmental and biological factors in an environment affected by a hydroelectric dam.

Implications

Our results may help fill gaps in knowledge about the diet of doradid fishes.

查看原文本刊更多论文

通过结合胃内容和稳定同位素分析，揭示受控洪峰区亚马逊鲶鱼的特殊食性

背景水文动态对鱼类生态至关重要。目的评估洪水脉冲对巴西新古河贝洛蒙特大坝减流河段 Doras higuchii 摄食生态的影响。方法在 2020 年 12 月至 2021 年 11 月期间进行采集。对鱼类进行了测量，并切除了它们的胃。还提取了肌肉组织用于稳定同位素分析。检查胃内容物以评估饮食情况，并使用 GLM 检验水文时期的影响。此外，我们还评估了洪水脉冲对个体的 δ13C 和同位素比率的影响结果共分析了 362 个 D. higuchii 标本，结果表明该物种的食物主要以沉积物（74.9%）和水生昆虫（24.8%）为主，不同时期的食性并无差异。食物强度存在差异，洪水期的平均食物消耗量较高。不同时期的同位素组成（δ13C 和 δ15N）也没有差异。最后，δ15N 在长度等级上也没有变化。结论这些信息有助于了解受水电站大坝影响的环境中环境因素与生物因素之间的关系。意义我们的研究结果可能有助于填补有关鲯鳅食性的知识空白。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine and Freshwater Research 环境科学-海洋学

CiteScore

4.60

自引率

5.60%

发文量

审稿时长

3.8 months

期刊介绍： Marine and Freshwater Research is an international and interdisciplinary journal publishing contributions on all aquatic environments. The journal’s content addresses broad conceptual questions and investigations about the ecology and management of aquatic environments. Environments range from groundwaters, wetlands and streams to estuaries, rocky shores, reefs and the open ocean. Subject areas include, but are not limited to: aquatic ecosystem processes, such as nutrient cycling; biology; ecology; biogeochemistry; biogeography and phylogeography; hydrology; limnology; oceanography; toxicology; conservation and management; and ecosystem services. Contributions that are interdisciplinary and of wide interest and consider the social-ecological and institutional issues associated with managing marine and freshwater ecosystems are welcomed. Marine and Freshwater Research is a valuable resource for researchers in industry and academia, resource managers, environmental consultants, students and amateurs who are interested in any aspect of the aquatic sciences. Marine and Freshwater Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.