Detection of multiple fish species in the diet of the invasive round goby reveals new trophic interactions in the Baltic Sea

IF 2.2 3区 环境科学与生态学 Q2 ECOLOGY
Isa Wallin Kihlberg, Ann-Britt Florin, K. Lundström, Ö. Östman
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引用次数: 3

Abstract

The mesopredatory round goby (Neogobius melanostomus) is an important fish invader in fresh and brackish waters of the northern hemisphere. Trophic interactions of invasive species can generate ecological impacts across the food web in invaded ecosystems. Here we investigated major diet components, spatiotemporal variation in diet and the effect of round goby densities on diet composition in two geographically distinct round goby populations in the Baltic Sea. The round goby is a generalist feeder but previous diet studies, based on visual prey identification, have likely over-emphasized the importance of hard-shelled, invertebrate prey in round goby diet, as shells degrade and evacuate slowly relative to soft-bodied prey that break down rapidly in the stomach. We therefore, in addition to visual stomach content analysis, used DNA metabarcoding, which is less biased towards hard body structures of prey and can be used for species assignment of highly degraded prey. The results demonstrated that round goby diet composition varied between areas and years. Visual stomach content analysis indicated that blue mussel was the main prey in the southern area, whereas hydrobiid gastropods were the major diet component in the northern area. Metabarcoding revealed that several fish species, likely the egg or larval stages of e.g. stickleback, cod and herring, were also part of the round goby diet. Analyses suggested that round goby feeding on fishes was positively associated with round goby densities. Our study shows that round goby, in addition to benthic invertebrates, preys on several fish species of ecological and commercial importance. Thus, there is potential for predator-prey reversal and negative effects of the invasive round goby on large, predatory fishes.
在入侵的圆虾虎鱼的饮食中多种鱼类的Detection揭示了波罗的海新的营养相互作用
中游圆虾虎鱼(Neogobius melanostomus)是北半球淡水和咸淡水中重要的鱼类入侵者。入侵物种的营养相互作用可以在入侵生态系统的整个食物网中产生生态影响。本文研究了波罗的海两个地理位置不同的圆虾虎鱼种群的主要饮食成分、饮食的时空变化以及圆虾虎鱼密度对饮食组成的影响。圆虾虎鱼是一种多面手的捕食者,但之前的饮食研究,基于视觉猎物识别,可能过分强调了硬壳、无脊椎猎物在圆虾虎鱼饮食中的重要性,因为相对于在胃中迅速分解的软体猎物,壳的降解和排泄速度较慢。因此,除了视觉胃内容物分析外,我们还使用DNA元条形码,这种方法对猎物的硬体结构偏差较小,可用于高度退化猎物的物种分配。结果表明,虾虎鱼的日粮组成在不同地区和年份之间存在差异。视觉胃内容物分析表明,南部地区以蓝贻贝为主要猎物,北部地区以腹足类水生动物为主要食物。元条形码显示,几种鱼类,如棘鱼、鳕鱼和鲱鱼的卵或幼虫阶段,也属于圆虾虎鱼的食物。分析表明,圆虾虎鱼以鱼类为食与圆虾虎鱼密度呈正相关。我们的研究表明,除了底栖无脊椎动物外,圆虾虎鱼还捕食几种具有生态和商业重要性的鱼类。因此,有潜在的捕食者-猎物逆转和入侵圆虾虎鱼对大型掠食性鱼类的负面影响。
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来源期刊
Aquatic Invasions
Aquatic Invasions ECOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
4.30
自引率
0.00%
发文量
20
审稿时长
6-12 weeks
期刊介绍: Aquatic Invasions is an open access, peer-reviewed international journal focusing on academic research of biological invasions in both inland and coastal water ecosystems from around the world. It was established in 2006 as initiative of the International Society of Limnology (SIL) Working Group on Aquatic Invasive Species (WGAIS) with start-up funding from the European Commission Sixth Framework Programme for Research and Technological Development Integrated Project ALARM. Aquatic Invasions is an official journal of International Association for Open Knowledge on Invasive Alien Species (INVASIVESNET). Aquatic Invasions provides a forum for professionals involved in research of aquatic non-native species, including a focus on the following: • Patterns of non-native species dispersal, including range extensions with global change • Trends in new introductions and establishment of non-native species • Population dynamics of non-native species • Ecological and evolutionary impacts of non-native species • Behaviour of invasive and associated native species in invaded areas • Prediction of new invasions • Advances in non-native species identification and taxonomy
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