Dietary habits change of Lessepsian migrants’ fish from the Red Sea to the Eastern Mediterranean Sea

IF 2.2 3区 环境科学与生态学 Q2 ECOLOGY
Rami Tsadok, Ziv Zemah-Shamir, Eli Shemesh, Stephane Martinez, Debra Ramon, Itai Kolski, Anat Tsemel, Dan Tchernov
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Abstract

As impacts on the Mediterranean Sea are expected to grow in the future, especially with climate change, habitat degradation, and displacement of native species by non-indigenous species (NIS), the investigation of significant alterations to trophic levels in this diverse marine habitat is important. Analysis of stable isotopes from targeted consumers has previously been shown to reliably reflect that of primary producers, thus enabling us to describe and highlight potential shifts in the food web of a particular ecosystem. In this study, we used δ 13 C values of essential amino acids (AA) in order to examine the dietary composition of established non-native, Lessepsian fish migrants in the Eastern Mediterranean Sea compared to that of the same fish species from their original population in the Gulf of Aqaba, Red Sea. Our data show that a clear variance in carbon isotopic signatures exists in food sources consumed by the same species between the different environments, with the exception of the classic herbivore, Siganus rivulatus (Forsskål & Niebuhr, 1775), whose very similar isotopic patterns reflect the algal source they predominantly consume in both locations. With the results of this research, we propose that Lessepsian fishes with the ability to maintain their nutritional patterns, though not necessarily that of their original food source, will acclimatize better in their new habitat. Consequences of flourishing Lessepsian fish populations include a further tropicalization of the Eastern Mediterranean Sea and the likely restructuring of local food webs.
Dietary从红海到东地中海的利塞普西亚洄游鱼类的习性变化
随着气候变化、栖息地退化和非本地物种(NIS)取代本地物种对地中海的影响预计将在未来增加,对这一多样化海洋栖息地营养水平的重大变化进行调查具有重要意义。对目标消费者的稳定同位素的分析已被证明能够可靠地反映初级生产者的稳定同位素,从而使我们能够描述和突出特定生态系统食物网的潜在变化。在这项研究中,我们使用必需氨基酸(AA)的δ 13 C值来研究地中海东部已建立的非本地迁徙鱼类的膳食组成,并将其与红海亚喀巴湾原始种群的相同鱼类进行比较。我们的数据表明,在不同的环境中,同一物种消耗的食物来源的碳同位素特征存在明显的差异,除了经典的食草动物Siganus rivulatus (forsskatl &Niebuhr, 1775),它们非常相似的同位素模式反映了它们在两个地点主要消耗的藻类来源。根据这项研究的结果,我们提出,有能力维持其营养模式的小塞浦西鱼,尽管不一定是他们原来的食物来源,将更好地适应他们的新栖息地。莱塞普西亚鱼类数量激增的后果包括地中海东部进一步的热带化,以及当地食物网可能的重组。
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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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