Can non-native perch (Perca fluviatilis) support native eel populations in a wetland complex?

IF 1.6 3区 农林科学 Q3 FISHERIES
Cohen Stewart, Blake Harper, Jayde Couper, Sarah J. Bury, Amandine Sabadel
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Abstract

It is well established that non-native fish can become invasive and outcompete and displace native fish populations. However, little research has explored the potential benefits that non-native fish may provide to native fish populations. To address this information gap, we examined how the availability of non-native perch (Perca fluviatilis) as prey could benefit populations of the endemic longfin eel (Anguilla dieffenbachii) and the native shortfin eel (Anguilla australis) in two neighbouring open-water wetlands in the Rakatu-Redcliff wetland complex in the Southland region of Aotearoa New Zealand. The Redcliff wetland fish community comprised native fish only, while the Rakatu wetland comprised native fish and non-native perch. We compared the size, condition, population density, population size structure and diet of eels in these wetlands. While eels were not necessarily larger or better conditioned in Rakatu wetland, their population density was three times higher than the Redcliff wetland, with young-of-the-year perch comprising ca. 40% of their diet. Furthermore, juvenile eel density was four times lower in Redcliff wetland, suggesting that cannibalism may occur at this site to support the existing eel population. Based on our findings, we suggest that freshwater managers consider the predator–prey dynamics of both native and non-native fish before removing non-native species, to avoid unintended negative consequences for native predatory fish species.

非本地鲈鱼(Perca fluviatilis)能否支持湿地群中的本地鳗鱼种群?
众所周知,非本地鱼类会成为入侵物种,并取代本地鱼类种群。然而,很少有研究探讨非本地鱼类可能为本地鱼类种群带来的潜在益处。为了填补这一信息空白,我们研究了非本地鲈鱼(Perca fluviatilis)作为猎物如何使新西兰奥特亚罗瓦南兰地区拉卡图-雷德克利夫湿地综合体中两个相邻的开阔水域中特有的长鳍鳗(Anguilla dieffenbachii)和本地短鳍鳗(Anguilla australis)种群受益。Redcliff 湿地的鱼类群落只包括本地鱼类,而 Rakatu 湿地则包括本地鱼类和非本地鲈鱼。我们比较了这些湿地中鳗鱼的大小、状态、种群密度、种群大小结构和食性。虽然拉卡图湿地的鳗鱼并不一定更大或体质更好,但其种群密度是红崖湿地的三倍,其中幼年鲈鱼约占其食物的 40%。此外,红崖湿地的鳗鱼幼体密度比这里低四倍,这表明这里可能会发生食人现象,以支持现有的鳗鱼种群。根据我们的研究结果,我们建议淡水管理者在移除非本地物种之前考虑本地鱼类和非本地鱼类的捕食者-猎物动态,以避免对本地捕食性鱼类造成意想不到的负面影响。
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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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