The introduced Arapaima gigas in the Bolivian Amazon: Trophic position and isotopic niche overlap with native species

IF 1.6 3区 农林科学 Q3 FISHERIES Ecology of Freshwater Fish Pub Date : 2023-06-15 DOI:10.1111/eff.12734
Danny Rejas, Thierry Oberdorff, Steven A. J. Declerck, Monika Winder
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Abstract

Non-native fish species may generate major ecological impacts on native assemblages. This study aims to assess the potential impact of the introduced Arapaima gigas on native fish assemblages in two oxbow lakes of the Bolivian Amazon. Stable isotope data were used to determine trophic position (TP) and isotopic niche overlap, to evaluate potential predation and competition interactions, respectively. Results suggest that A. gigas is more an omnivore than a top predator, as often claimed. Arapaima gigas occupied an intermediate TP between detritivore/herbivore and piscivore fish species and showed broader isotopic niche compared to most native species analysed. The isotopic niche of A. gigas significantly overlapped with most native fish species in one lake (i.e. Lake Mentiroso), while there was low niche overlap in the second (i.e. Lake Miraflores). Given its omnivorous tendencies, the predation impact of A. gigas on other fish species is likely less than currently claimed and likely varies with the food web structure of the ecosystem. More precise data on resource availability and use are necessary to infer whether niche overlap will have negative impacts on native fish species through potential competitive interactions. Increasing our understanding on the processes generating impact of these introductions on resident communities through food web ecology will pave the way for better resource management and conservation efforts.

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玻利维亚亚马逊引入的Arapaima gigas:营养位置和同位素生态位与本地物种重叠
非本地鱼类可能对本地鱼群造成重大的生态影响。本研究旨在评估引进巨骨舌鱼对玻利维亚亚马逊河两个牛轭湖本地鱼类群落的潜在影响。稳定同位素数据用于确定营养位置(TP)和同位素生态位重叠,分别评估潜在的捕食和竞争相互作用。研究结果表明,gigas更像是一种杂食动物,而不是像人们常说的那样是顶级捕食者。巨骨舌鱼的同位素生态位介于食腐/草食鱼类和食鱼鱼类之间,与大多数本地物种相比,巨骨舌鱼的同位素生态位更宽。其中一个湖(如门蒂罗索湖)的双鱼同位素生态位与大多数本地鱼类存在显著的重叠,而另一个湖(如米拉弗洛雷斯湖)的同位素生态位重叠程度较低。鉴于其杂食性倾向,巨虾对其他鱼类的捕食影响可能比目前声称的要小,并且可能随着生态系统的食物网结构而变化。为了推断生态位重叠是否会通过潜在的竞争相互作用对本地鱼类产生负面影响,需要更精确的资源可用性和利用数据。通过食物网生态学增加我们对这些引进对居民社区产生影响的过程的理解,将为更好的资源管理和保护工作铺平道路。
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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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