Species turnover drives functional turnover with balanced functional nestedness in a Patagonian demersal assemblage

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY
Josefina Cuesta Núñez , María Alejandra Romero , Matías Ocampo Reinaldo , Raúl González , Anne Magurran , Guillermo Martín Svendsen
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引用次数: 0

Abstract

Marine communities are changing at an accelerated rate because of anthropogenic stressors such as global warming and overfishing. Community compositional change over time (temporal β diversity) is mainly driven by the replacement of species. The consequence of this change on community functioning is still unclear. In this study, we assessed the magnitude and direction of both taxonomic and functional compositional change in a demersal community subject to fishing and incipient sea warming over a recent 12-year period. We also evaluated the relative roles of turnover and nestedness components on both dimensions of temporal β diversity and identified which species are driving compositional change. Compositional data was collected during five surveys that took place between 2006 and 2018. We used linear mixed models to test for temporal change in species richness and taxonomic and functional dissimilarity and its components. While species richness remained constant, taxonomic and functional dissimilarity increased through time, with turnover contributing most to total dissimilarity in both cases. Taxonomic turnover of around 15% of species per decade produced a functional replacement of 13% per decade. The main functional change is probably due to the spatial expansion of three species of crustaceans which are bringing functional novelty to certain areas of the gulf. We found that local extinctions and colonization were balanced, which suggests that species richness is being regulated at the local scale within the gulf. We also found a balance in functional nestedness, which leads us to infer that this variable is also being regulated at the community level.

在巴塔哥尼亚海底群落中,物种更替以平衡的功能巢性驱动功能更替
由于全球变暖和过度捕捞等人为压力因素,海洋群落正在加速变化。群落组成随时间的变化(时间β多样性)主要由物种更替驱动。这种变化对社区功能的影响尚不清楚。在这项研究中,我们评估了近12年来受捕捞和海洋初变暖影响的海底群落的分类和功能组成变化的幅度和方向。我们还评估了周转和筑巢成分在时间β多样性两个维度上的相对作用,并确定了哪些物种驱动了成分变化。成分数据是在2006年至2018年期间进行的五次调查中收集的。我们使用线性混合模型来测试物种丰富度、分类和功能差异及其组成部分的时间变化。在物种丰富度保持不变的情况下,分类和功能差异随着时间的推移而增加,其中物种更替对总差异的贡献最大。每十年约15%的物种分类更替产生13%的功能替代。主要的功能变化可能是由于三种甲壳类动物的空间扩张,它们给海湾的某些地区带来了新的功能。我们发现,当地的灭绝和殖民是平衡的,这表明物种丰富度在海湾内的当地尺度上受到调节。我们还发现了功能嵌套性的平衡,这使我们推断这个变量也在社区层面受到调节。
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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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