Constraints on the functional trait space of aquatic invertebrates in bromeliads
Constraints on the functional trait space of aquatic invertebrates in bromeliads
复制标题
DOI：
10.1111/1365-2435.13141
复制
发表时间：
2018-10-01
影响因子：
5.2
通讯作者：
Montero, Guillermo
中科院分区：
文献类型：
--
作者：
Cereghino, Regis;Pillar, Valerio D.;Montero, Guillermo
1.功能特征通常用于将环境驱动因素和群落结构与生态系统功能联系起来的预测模型中。一个先决条件是确定强大的连续轴的性状变异，并了解生态和进化的限制，导致相互作用的物种所占据的功能性状空间。尽管它们在生态系统功能中的多样性和作用，但对整个地理区域的无脊椎生物的功能特征空间的限制知之甚少。我们研究了生态策略和限制的基础上实现的特征空间的水生无脊椎动物，使用12个功能性状的852个类群收集在坦克凤梨从墨西哥到阿根廷的数据。主成分分析被用来减少性状变异的显着轴的性状维度，和实际上被所有类群占据的潜在性状空间的比例相比，空模型的期望。利用排列方差分析检验性状组合是否具有分支依赖性。性状变异的主轴代表生活史策略优化资源利用和抗捕食适应。有营养，栖息地，国防和生活史生态位轴的证据。凤梨科无脊椎动物只占据了16%-23%的潜在空间内这些尺寸，由于更大的浓度比均匀或正态分布下的预测。因此，尽管高度分类多样性，无脊椎动物只利用了少数成功的生态策略。性状空间中的空白区域代表了生物创新产生的主要门与凤梨生态系统中不可行的性状组合之间的差距。只有少数亲缘关系远的属在性状空间上是相邻的。性状组合聚集类群的家庭，然后顺序，表明生态位保守性是一个普遍的机制，在多样化的生态策略。
1. Functional traits are commonly used in predictive models that link environmental drivers and community structure to ecosystem functioning. A prerequisite is to identify robust sets of continuous axes of trait variation, and to understand the ecological and evolutionary constraints that result in the functional trait space occupied by interacting species. Despite their diversity and role in ecosystem functioning, little is known of the constraints on the functional trait space of invertebrate biotas of entire biogeographic regions.2. We examined the ecological strategies and constraints underlying the realized trait space of aquatic invertebrates, using data on 12 functional traits of 852 taxa collected in tank bromeliads from Mexico to Argentina. Principal Component Analysis was used to reduce trait dimensionality to significant axes of trait variation, and the proportion of potential trait space that is actually occupied by all taxa was compared to null model expectations. Permutational Analyses of Variance were used to test whether trait combinations were clade-dependent.3. The major axes of trait variation represented life-history strategies optimizing resource use and antipredator adaptations. There was evidence for trophic, habitat, defence and life-history niche axes. Bromeliad invertebrates only occupied 16%-23% of the potential space within these dimensions, due to greater concentrations than predicted under uniform or normal distributions. Thus, despite high taxonomic diversity, invertebrates only utilized a small number of successful ecological strategies.4. Empty areas in trait space represented gaps between major phyla that arose from biological innovations, and trait combinations that are unviable in the bromeliad ecosystem. Only a few phylogenetically distant genera were neighbouring in trait space. Trait combinations aggregated taxa by family and then by order, suggesting that niche conservatism was a widespread mechanism in the diversification of ecological strategies.