Effects of physical ecosystem engineering and herbivory on intertidal community structure
Effects of physical ecosystem engineering and herbivory on intertidal community structure
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物理生态系统工程和食草对潮间带群落结构的影响
DOI：
10.3354/meps317029
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发表时间：
2006
影响因子：
2.5
通讯作者：
C. Harley
中科院分区：
文献类型：
--
作者：
C. Harley
物理生态系统工程师在各种社区中发挥着主导作用。虽然生态系统工程师的许多直接、积极的影响是显而易见的，但工程师的作用往往是通过促进一个或几个关键物种产生的间接相互作用来调节的。尽管直接和间接影响都是群落动态的关键驱动因素，但在生态系统工程中很少将它们一起考虑。在本研究中，通过实验控制藤壶和草食性腹足动物的密度，以研究藤壶提供栖息地的直接积极影响以及软体动物食草动物介导的间接影响。软体动物食草动物（Littorina spp.）和食草节肢动物受到藤壶的存在的积极影响。当 Littorina spp. 节肢动物丰度和物种丰富度较低时。在场。这种模式不受藤壶覆盖的影响，表明食草动物功能群之间的竞争很激烈，但与生物栖息地的复杂性无关。此外，Littorina spp。对丝状藻 Urospora penicilliformis 有强烈的负面影响，但这种影响只有在没有藤壶的情况下才会出现。最后，Littorina spp。减少了主要栖息地形成藤壶 Balanus 腺体的招募，表明 Littorina spp。可能介导腺杆菌种群动态的负反馈循环。鉴于生态系统工程师无处不在，直接和间接影响的类似组合可能会对各种系统中的群落动态和物种丰富度产生深远的影响。
Physical ecosystem engineers play dominant roles in a wide variety of communities. While many of the direct, positive effects of ecosystem engineers are readily apparent, the roles of engineers are often mediated by indirect interactions stemming from the facilitation of one or a few key species. Although direct and indirect effects are both critical drivers of community dynamics, they are rarely considered together with regards to ecosystem engineering. In the present study barnacle and herbivorous gastropod densities are experimentally manipulated to investigate the direct positive effects of habitat provision by barnacles as well as indirect effects mediated by mollus- can grazers. Molluscan grazers (Littorina spp.) and herbivorous arthropods were positively influ- enced by the presence of barnacles. Arthropod abundance and species richness were lower when Littorina spp. were present. This pattern was not influenced by barnacle cover, suggesting that competition among herbivore functional groups was strong but independent of biogenic habitat complexity. In addition, Littorina spp. had strong negative effects on the filamentous alga Urospora penicilliformis, but this effect was only seen in the absence of barnacles. Finally, Littorina spp. reduced the recruitment of the principal habitat-forming barnacle Balanus glandula, suggesting that Littorina spp. may mediate a negative feedback loop in B. glandula population dynamics. Given the ubiquity of ecosystem engineers, similar combinations of direct and indirect influences may have far-reaching consequences for community dynamics and species richness in a wide range of systems.