Temporal and Ontogenetic Changes in Feeding Ecology of a Characid From Karst Dolines of the Neotropics

IF 1.6 3区 农林科学 Q3 FISHERIES
Amanda Menegante Caldatto, Rosa Maria Dias, Fernando César Paiva Dagosta, Anderson Ferreira
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Abstract

Environmental and biological factors strongly shape fish diets, yet little is known about such influences in flooded Karst Dolines of the Neotropical region. This study examined the diet of Deuterodon luetkenii and assessed its temporal and ontogenetic variation in Lagoa Misteriosa, a karstic lagoon. Fish were sampled bimonthly over 1 year and categorised into two hydrological periods: with algal blooms (WAB) and without algal blooms (AAB). A total of 540 stomachs from four body size classes were analysed, identifying 33 food items. Diet composition varied significantly between periods and among size classes. Filamentous algae and macrophytes were more consumed during the AAB period, while aquatic invertebrates predominated during the WAB period. Niche breadth remained consistent across periods but differed among size classes, indicating ontogenetic dietary shifts. Our findings underscore the ecological role of autochthonous resources and macrophytes in shaping feeding strategies and habitat use in karst ecosystems. Understanding these dynamics is crucial for conservation efforts and for anticipating the potential impacts of environmental changes on trophic interactions within karst environments.

Abstract Image

新热带喀斯特山地一种特征取食生态的时间和个体发生变化
环境和生物因素在很大程度上影响了鱼类的饮食,但人们对新热带地区喀斯特水淹线的影响知之甚少。本研究研究了喀斯特潟湖(Lagoa Misteriosa)中luetkendeuterodon的饮食,并评估了其时间和个体发生的变化。鱼在一年的时间里每两个月取样一次,并分为两个水文时期:有藻华(WAB)和没有藻华(AAB)。研究人员分析了四种体型的540个胃,确定了33种食物。不同时期和不同体型的日粮组成差异显著。AAB期以丝状藻类和大型植物为主,WAB期以水生无脊椎动物为主。生态位宽度在不同时期保持一致,但在不同大小类别之间存在差异,表明个体发生的饮食变化。我们的研究结果强调了原生资源和大型植物在喀斯特生态系统中塑造摄食策略和栖息地利用方面的生态作用。了解这些动态对于保护工作和预测喀斯特环境中环境变化对营养相互作用的潜在影响至关重要。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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