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Species identity drives ecosystem function in a subsidy-dependent coastal ecosystem
Oecologia ( IF 2.7 ) Pub Date : 2021-07-29 , DOI: 10.1007/s00442-021-05002-w
Kyle A Emery 1 , Jenifer E Dugan 1 , R A Bailey 2 , Robert J Miller 1
Affiliation  

Declines in species diversity carry profound implications for ecosystem functioning. Communities of primary producers and consumers interact on evolutionary as well as ecological time scales, shaping complex relationships between biodiversity and ecosystem functioning. In subsidized ecosystems, resource inputs are independent of consumer actions, offering a simplified view of the relationship between species diversity and function for higher trophic levels. With food webs supported by substantial but variable inputs of detritus from adjacent marine ecosystems, sandy beaches are classic examples of subsidized ecosystems. We investigated effects of consumer species diversity and identity on a key ecological function, consumption of kelp wrack from nearshore giant kelp (Macrocystis pyrifera) forests. We assessed effects of species richness on kelp consumption by experimentally manipulating richness of six common species of invertebrate detritivores in laboratory mesocosms and conducting field assays of kelp consumption on beaches. Consumer richness had no effect on kelp consumption in the field and a slight negative effect in laboratory experiments. Kelp consumption was most strongly affected by the species composition of the detritivore community. Species identity and body size of intertidal detritivores drove variation in kelp consumption rates in both experiments and field assays. Our results provide further evidence that species traits, rather than richness per se, influence ecosystem function most, particularly in detrital-based food webs with high functional redundancy across species. On sandy beaches, where biodiversity is threatened by rising sea levels and expanding development, our findings suggest that loss of large-bodied consumer species could disproportionally impact ecosystem function.



中文翻译:

物种身份在依赖补贴的沿海生态系统中驱动生态系统功能

物种多样性的下降对生态系统功能产生了深远的影响。初级生产者和消费者的社区在进化和生态时间尺度上相互作用,形成生物多样性和生态系统功能之间的复杂关系。在受补贴的生态系统中,资源投入与消费者行为无关,从而简化了物种多样性与更高营养级功能之间关系的视图。由于食物网由来自相邻海洋生态系统的大量但可变的碎屑输入支持,沙滩是补贴生态系统的典型例子。我们调查了消费者物种多样性和身份对关键生态功能的影响,即食用近岸巨型海带(Macrocystis pyrifera) 森林。我们通过在实验室中观世界中实验性地操纵六种常见无脊椎动物食腐动物物种的丰富度并在海滩上进行海带消耗量的实地分析,评估了物种丰富度对海带消耗量的影响。消费者丰富度对田间海带消费没有影响,在实验室实验中略有负面影响。海带消费受碎屑动物群落物种组成的影响最大。在实验和田间测定中,潮间带碎屑动物的物种身份和体型驱动了海带消耗率的变化。我们的研究结果提供了进一步的证据,即物种特征而非丰富度本身对生态系统功能的影响最大,特别是在基于碎屑的食物网中,物种间具有高度的功能冗余。在沙滩上,

更新日期:2021-07-29
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