Programa DTI/CNPq, Instituto Nacional de Ciência e Tecnologia em Ecologia, Evolução e Conservação da Biodiversidade (EECBio), Universidade Federal de Goiás, Goiânia, Goiás, Brazil.
Department of Ecology, Graduate Program in Ecology and Evolution, Federal University of Goiás, Goiânia, Goiás, Brazil.
J Anim Ecol. 2024 Nov;93(11):1771-1784. doi: 10.1111/1365-2656.14190. Epub 2024 Oct 1.
Diversity and interspecific synchrony are among the main drivers behind the temporal stability of community abundance. Diversity can increase stability through the portfolio effect, while higher synchrony generally decreases stability. In turn, species interactions and similar responses to environmental variation are considered the main factors underlying the strength of interspecific synchrony, despite the challenges in determining their relative roles. The analysis of the relationship between interspecific synchrony and the trait (or phylogenetic) distance between species can increase the robustness of inferences about these factors. Here, we used pairwise interspecific and community-wide analyses to investigate, respectively, the drivers of interspecific synchrony and the influence of trait and phylogenetic diversity on the stability of fish communities. For that, we used 18 years of fish abundance data from the Upper Paraná River floodplain. At the interspecific level, we used quantile regressions to test within-guild relationships between interspecific synchrony and trait and phylogenetic distance between species. At the community level, we tested the relationships between community-wide synchrony, stability, and (trait and phylogenetic) diversity. We found that interspecific synchrony decreased with trait and phylogenetic distances. In the community-level analysis, we found that more synchronous fish communities were less stable, but the relationship between diversity and stability was in general weak. At the interspecific level, our study highlights the role of similar responses to environmental variation in driving species' temporal dynamics. At the community level, the strength of the relationships between trait or phylogenetic diversity and community stability depended on the feeding guild. On the other hand, we found strong relationships between synchrony and stability. These results suggest that increased synchrony levels in response to regional environmental changes could decrease the stability of fish communities in this floodplain.
多样性和种间同步性是群落丰度时间稳定性的主要驱动因素之一。多样性可以通过投资组合效应增加稳定性，而较高的同步性通常会降低稳定性。反过来，物种相互作用和对环境变化的相似响应被认为是种间同步性强度的主要因素，尽管确定它们相对作用具有挑战性。分析种间同步性与物种之间的特征（或系统发育）距离之间的关系，可以提高关于这些因素的推断的稳健性。在这里，我们使用成对的种间和群落范围分析，分别研究种间同步性的驱动因素以及特征和系统发育多样性对鱼类群落稳定性的影响。为此，我们使用了来自上巴拉那河洪泛区的 18 年鱼类丰度数据。在种间水平上，我们使用分位数回归来检验种间同步性与物种之间特征和系统发育距离之间的种内关系。在群落水平上，我们检验了群落范围同步性、稳定性和（特征和系统发育）多样性之间的关系。我们发现种间同步性随特征和系统发育距离的增加而降低。在群落水平分析中，我们发现更同步的鱼类群落稳定性较低，但多样性和稳定性之间的关系总体较弱。在种间水平上，我们的研究强调了对环境变化的相似响应在驱动物种时间动态方面的作用。在群落水平上，特征或系统发育多样性与群落稳定性之间的关系强度取决于摄食群。另一方面，我们发现同步性和稳定性之间存在很强的关系。这些结果表明，由于区域环境变化而导致的同步性水平的提高可能会降低该洪泛区鱼类群落的稳定性。
