Trait sensitivities to seagrass fragmentation across spatial scales shape benthic community structure
Trait sensitivities to seagrass fragmentation across spatial scales shape benthic community structure
复制标题
跨空间尺度对海草破碎的性状敏感性塑造底栖群落结构
DOI：
10.1111/1365-2656.13067
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发表时间：
2019
影响因子：
4.8
通讯作者：
Rueda, ed., Marta
中科院分区：
文献类型：
--
作者：
Yeager, Lauren A.;Geyer, Julie K.;Fodrie, Fredrick Joel;Rueda, ed., Marta
当地生态群落的结构被认为是由一系列层次化的非生物和生物过滤器决定的，这些过滤器根据物种的特征选择支持或反对物种。许多人类的影响，比如碎片化，有助于改变一系列空间尺度上的环境条件，并可能影响性状-环境的相互作用。我们研究了与海草生境从微生境到景观尺度的生境破碎化相关的环境变化对控制底栖动物分类和基于特征的群落结构的影响。我们测量了海草表栖动物和底栖动物的物种丰度和生物量模式。使用沉积物岩心从86个地点（横跨21个草地）在美国北卡罗来纳州的巴克桑德采样。我们与当地动物群落结构的环境变化测量在三个空间尺度（微生境，补丁和景观）。此外，我们还测试了物种特征在预测物种对不同尺度生境破碎化的响应方面的价值。（即总密度，生物量和物种丰富度）仅与微生境尺度的海草生物量呈正相关，整体群落结构由微生境，斑块的环境变化预测（即斑块大小）和景观（即斑块数量、景观海草面积）尺度。此外，第四角分析表明，物种特征解释了生物密度的变化与物种身份一样多。例如，物种的浮游分散幼虫和存款喂养营养模式更丰富的连续，高海草覆盖landscapes. We悬浮馈线青睐更破碎的landscapes.We提出的定量证据支持层次模型的社区组装，预测物种性状和环境变化之间的相互作用跨尺度最终驱动当地社区组成。个体性状对多个环境变量的响应表明，在生境破碎化下，通过与扩散、流动和营养模式相关的性状作用于物种的群落组装过程将被改变。此外，随着全球气温的升高，热带海草Haloelasticwrightiii预计将取代温带大叶藻作为我们研究区域的主导海草，因此可能有利于具有浮游分散幼虫的物种，并削弱环境对群落聚集的控制力度。
The structure of local ecological communities is thought to be determined by a series of hierarchical abiotic and biotic filters which select for or against species based on their traits. Many human impacts, like fragmentation, serve to alter environmental conditions across a range of spatial scales and may impact trait–environment interactions.We examined the effects of environmental variation associated with habitat fragmentation of seagrass habitat measured from microhabitat to landscape scales in controlling the taxonomic and trait‐based community structure of benthic fauna.We measured patterns in species abundance and biomass of seagrass epifauna and infauna sampled using sediment cores from 86 sites (across 21 meadows) in Back Sound, North Carolina, USA. We related local faunal community structure to environmental variation measured at three spatial scales (microhabitat, patch and landscape). Additionally, we tested the value of species traits in predicting species‐specific responses to habitat fragmentation across scales.While univariate measures of faunal communities (i.e. total density, biomass and species richness) were positively related to microhabitat‐scale seagrass biomass only, overall community structure was predicted by environmental variation at the microhabitat, patch (i.e. patch size) and landscape (i.e. number of patches, landscape seagrass area) scales. Furthermore, fourth‐corner analysis revealed that species traits explained as much variation in organismal densities as species identity. For example, species with planktonic‐dispersing larvae and deposit‐feeding trophic modes were more abundant in contiguous, high seagrass cover landscapes while suspension feeders favoured more fragmented landscapes.We present quantitative evidence supporting hierarchal models of community assembly which predict that interactions between species traits and environmental variation across scales ultimately drive local community composition. Variable responses of individual traits to multiple environmental variables suggest that community assembly processes that act on species via traits related to dispersal, mobility and trophic mode will be altered under habitat fragmentation. Additionally, with increasing global temperatures, the tropical seagrassHalodule wrightiiis predicted to replace the temperateZostera marinaas the dominate seagrass in our study region, therefore potentially favouring species with planktonic‐dispersing larva and weakening the strength of environmental control on community assembly.