Functionally新的入侵掠食者消灭了沿海社区的食草动物

IF 2.2 3区 环境科学与生态学 Q2 ECOLOGY
Veijo Jormalainen, Essi Kiiskinen, Veera Hauhia, Sami Merilaita
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引用次数: 1

摘要

在群岛海和波罗的海的大多数其他地方一样,膀胱残骸(Fucus vesiculosus)是岩石海岸沿岸群落的基础物种。它维持着附生藻类、食草甲壳类动物、软体动物和各种鱼类的群落。近年来,我们注意到在群岛海的许多地点,食草甲壳类动物和软体动物的数量急剧下降。我们假设导致这种下降的一个关键因素是最近引进的哈里斯泥蟹(哈里斯泥蟹),它于2009年首次在该地区被发现。重要的是,由于波罗的海北部没有本地螃蟹,泥蟹在生态系统中是一种全新的捕食者,食草甲壳类动物和软体动物可能特别容易受到泥蟹的影响。在这里,我们记录了发生在膀胱残骸上的典型食草动物的急剧减少,可能表明正在进行的政权转变,通过比较我们最近从群岛海收集的样本与发现泥蟹之前10年收集的数据。此外,我们还证明了泥蟹种群数量的减少,特别是关键的草食类等足类的减少,与泥蟹种群的建立之间存在时空关联。我们还提供了实验证据,证明泥蟹和等足类动物之间存在强烈的捕食者-猎物联系。最后,我们讨论了社区变化的可能后果,并仔细研究了我们观察到的其他解释。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Functionally novel invasive predator eradicates herbivores of a littoral community
In the Archipelago Sea as in most other parts of the Baltic Sea, the bladder wrack ( Fucus vesiculosus ) is a foundation species of the littoral communities of the rocky shores. It sustains a community of epiphytic algae, herbivorous crustaceans and molluscs and various fish. Recently we have noticed a steep decline in the occurrence of the herbivorous crustaceans and molluscs in many sites in the Archipelago Sea. We hypothesise that a key factor contributing to this decline is the recent introduction of the Harris mud crab ( Rhithropanopeus harrisii ), which was first sighted in 2009 in this region. Importantly, because there are no native crabs in the northern parts of the Baltic Sea, the mud crab is a completely novel kind of predator in the ecosystem and the herbivorous crustaceans and molluscs may be particularly susceptible to it. Here, we document a dramatic decline of the typical herbivores occurring on the bladder wrack, possibly indicating an ongoing regime shift, by comparing our recent samples from across the Archipelago Sea with data collected a decade before the sighting of the mud crab. Moreover, we demonstrate a spatio-temporal association between the decline, particularly of the key herbivore species, the isopod Idotea balthica , and the establishment of the mud crab. We also present experimental evidence for a strong predator-prey -link between the mud crab and the isopod I. balthica . Finally, we discuss the possible consequences of the community change and scrutinise alternative explanations for our observations.
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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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