Current温度限制了通常交易的掠食性腹足动物的潜在影响

IF 2.2 3区 环境科学与生态学 Q2 ECOLOGY
James W. E. Dickey, J. Jeschke, G. Steffen, E. Kazanavičiūtė, R. Brennan, Elizabeta Briski
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引用次数: 1

摘要

宠物贸易促进了外来入侵物种(IAS)在全球的传播,对生物多样性产生了负面影响。对入侵生态学家来说,预测影响是一个主要目标,在一个往往缺乏交易物种知识的行业中,这一点尤为重要。我们的研究重点是腹足类掠食性动物海伦娜(Anentome helena),该物种起源于东南亚,在世界各地交易,但分类上存在不确定性。我们首先着手确定我们的研究生物在A.“helena”物种复群中的位置,已知包括至少四个隐物种,然后通过两种温度下的功能反应实验来评估温度对猎物数量的影响,即肺螺(pulmonate snail Physella acuta),每个捕食者杀死的数量。我们使用22°C作为圈养物种的推荐温度,18°C作为欧洲温带气候中代表性的夏季湖泊温度。我们还评估了在固定猎物密度的实验温度下,捕食者群体规模(1倍、2倍、3倍)对捕食(总食用量和人均食用量)的作用,以及这些温度对猎物活动的影响。我们的生物属于一种来自泰国的神秘物种(Anentome sp. a),与其他大陆水族馆贸易样本的发现相匹配。在功能响应实验中,我们发现在较低的温度下,最大进料速率明显降低。在群体饲养中也出现了类似的结果,在较低的温度下,总消费量显著减少,人均消费量下降接近显著。在组试验中,组大小对平均人均消费量没有显著影响,表明中性的同种相互作用。温度对被捕食物种的活动没有显著影响,表明消耗减少主要是由捕食者驱动的,而不是猎物。这些结果表明,海苔藻短期内的影响有限,但随着气候变化,气温升高可能会导致更大的后果。我们建议未来的研究评估其他潜在的掠食性影响和相关非生物条件下的生存,并鼓励使用类似的方法来评估其他常见交易物种的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Current temperatures limit the potential impact of a commonly traded predatory gastropod
The pet trade has facilitated the spread of invasive alien species (IAS) globally, with negative consequences for biodiversity. The prediction of impacts is a major goal for invasion ecologists, and is especially crucial in an industry often lacking knowledge about traded species. We focused on the predatory gastropod Anentome helena, a species originating in south-east Asia and traded around the world, but with taxonomic uncertainty. We first set out to determine where our study organism fell within the A. “helena” species complex, known to comprise at least four cryptic species, before assessing the effect of temperature on the number of prey, the pulmonate snail Physella acuta, killed per predator via functional response experiments at two temperatures. We used 22 °C as a recommended temperature for housing the species in captivity, and 18 °C as a representative summer lake temperature in temperate climates of Europe. We also assessed the role of predator group size (1×, 2×, 3×) on predation (total consumption and average per capita consumption) at the experimental temperatures with fixed densities of prey, as well as the effect of these temperatures on prey activity. Our organisms belonged to a cryptic species originating from Thailand (Anentome sp. A), matching the findings of aquarium trade samples in other continents. In the functional response experiments, we found maximum feeding rate to be significantly reduced at the lower temperature. A similar result ensued from group feeding, with total consumption significantly reduced and the reduction in average per capita consumption approaching significance at the lower temperature. There was no significant effect of group size on the average per capita consumption in the group trial, indicating neutral conspecific interactions. No significant effect of temperature on the activity of the prey species was found, suggesting decreased consumption was mainly driven by predator, rather than prey. These results suggest limited A. helena impacts in the short-term, but increasing temperatures with climate change may facilitate greater consequences from releases. We suggest future studies assess other potential predatory impacts and survival across relevant abiotic conditions, and encourage the use of similar methods to assess the impacts of other commonly traded species.
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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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