Spatial factors overcome seasonality regulating the consumption of allochthonous food resources by fishes from tropical lotic ecosystems

IF 2.8 2区生物学 Q2 ECOLOGY

Freshwater Biology Pub Date : 2024-03-23 DOI:10.1111/fwb.14245

Vitor Manuel Barros Ferreira, Bruno Eleres Soares, Juliana S. Leal, Míriam Pilz Albrecht

引用次数: 0

Abstract

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热带地块生态系统鱼类消耗异源食物资源的空间因素克服了季节性调节作用

在荷叶生态系统中，洪水和降雨事件期间预计会有更多的同源食物资源，消费者对这些资源的消耗量也会更大。然而，异源输入和环境条件的季节性都取决于当地情况。因此，淡水消费者对季节性的膳食反应也应因地制宜。在此，我们采用元分析方法确定了热带地层生态系统鱼类在不同季节相对消耗异源食物资源的相关空间和季节环境变量。我们从热带地区 70 个地方的 38 项研究中收集了 566 项关于鱼类种群在洪水期和干旱期（以下分别称为高水位期和低水位期）饮食情况的观测数据（即仅限于同一采样事件）。我们检索了每个地点的纬度、季节性河道宽度、海拔和两个异源输入代用指标：陆地生物量（不考虑季节性）和归一化差异植被指数（NDVI，考虑季节性）。然后，我们用这些环境变量作为预测变量，用每个消费者食物中的异源食物资源比例（%Allo）作为响应变量，建立了元回归模型。我们的模型显示，热带地层生态系统鱼类的食物大多以自生食物为主，不受水文时期（丰水期或枯水期）的影响，水生无脊椎动物是消耗最多的食物。陆地植被生物量和海拔高度预示着热带鱼在丰水期的食物中的异食性增加，但只有陆地生物量预示着在枯水期的异食性增加。我们没有发现纬度、河道宽度或 NDVI 与异食性之间的关系。我们的研究强调了考虑生物组织的层次和鱼类营养行会对理解鱼类相对消耗同源和自源食物资源的季节性模式的重要性。我们还认为，热带地区季节性的变化很可能削弱了其对鱼类食物异源性的影响。河道宽度与异食性之间不存在关系，这证明河流连续性概念更适合温带地段生态系统。我们的研究结果提供了新的见解和热带鱼类膳食季节性模式的全貌，可用于未来的地方实证研究，改善对异源和自源食物资源可用性因素与淡水鱼类膳食之间关系的预测。

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

Freshwater Biology 生物-海洋与淡水生物学

CiteScore

5.90

自引率

3.70%

发文量

162

审稿时长

2 months

期刊介绍： Freshwater Biology publishes papers on all aspects of the ecology of inland waters, including rivers and lakes, ground waters, flood plains and other freshwater wetlands. We include studies of micro-organisms, algae, macrophytes, invertebrates, fish and other vertebrates, as well as those concerning whole systems and related physical and chemical aspects of the environment, provided that they have clear biological relevance. Studies may focus at any level in the ecological hierarchy from physiological ecology and animal behaviour, through population dynamics and evolutionary genetics, to community interactions, biogeography and ecosystem functioning. They may also be at any scale: from microhabitat to landscape, and continental to global. Preference is given to research, whether meta-analytical, experimental, theoretical or descriptive, highlighting causal (ecological) mechanisms from which clearly stated hypotheses are derived. Manuscripts with an experimental or conceptual flavour are particularly welcome, as are those or which integrate laboratory and field work, and studies from less well researched areas of the world. Priority is given to submissions that are likely to interest a wide range of readers. We encourage submission of papers well grounded in ecological theory that deal with issues related to the conservation and management of inland waters. Papers interpreting fundamental research in a way that makes clear its applied, strategic or socio-economic relevance are also welcome. Review articles (FRESHWATER BIOLOGY REVIEWS) and discussion papers (OPINION) are also invited: these enable authors to publish high-quality material outside the constraints of standard research papers.