Eelgrass (Zostera marina) Food Web Structure in Different Environmental Settings
Eelgrass (Zostera marina) Food Web Structure in Different Environmental Settings
复制标题
不同环境条件下的鳗草（Zostera marina）食物网结构
作者：
Jonas Thormar;H. Hasler;S. Baden;C. Boström;K. Clausen;D. Krause‐Jensen;B. Olesen;J. Rasmussen;C. Svensson;M. Holmer
本研究比较了丹麦两个鳗草栖息地的鳗草 (Zostera marina L.) 草甸和相关食物网的结构，这些栖息地在暴露程度、与公海的连接、营养富集和水透明度方面存在差异。草甸结构强烈地反映了每个栖息地的环境条件。与营养较少且暴露程度较高的地点相比，富营养化的受保护地点具有较高的丝状藻生物量、较低的鳗草生物量和芽密度、较长且较窄的叶子以及较高的地上与地下生物量比率。富营养化、封闭的地点具有较高的消费者生物量和较不复杂的食物网，动物群落组成和食物网结构也存在显着差异。这些关系导致富营养化地点的消费者呈柱状生物量分布，而营养不太丰富的地点则呈现出消费者的金字塔形生物量分布以及更多样化的消费者社区。两个海草栖息地的草地和食物网结构的差异表明物理环境如何影响生态系统对人为压力的反应和恢复力。我们鼓励进行更大规模的重复研究，以进一步理清不同环境变量对海草食物网结构的影响。
This study compares the structure of eelgrass (Zostera marina L.) meadows and associated food webs in two eelgrass habitats in Denmark, differing in exposure, connection to the open sea, nutrient enrichment and water transparency. Meadow structure strongly reflected the environmental conditions in each habitat. The eutrophicated, protected site had higher biomass of filamentous algae, lower eelgrass biomass and shoot density, longer and narrower leaves, and higher above to below ground biomass ratio compared to the less nutrient-enriched and more exposed site. The faunal community composition and food web structure also differed markedly between sites with the eutrophicated, enclosed site having higher biomass of consumers and less complex food web. These relationships resulted in a column shaped biomass distribution of the consumers at the eutrophicated site whereas the less nutrient-rich site showed a pyramidal biomass distribution of consumers coupled with a more diverse consumer community. The differences in meadow and food web structure of the two seagrass habitats, suggest how physical setting may shape ecosystem response and resilience to anthropogenic pressure. We encourage larger, replicated studies to further disentangle the effects of different environmental variables on seagrass food web structure.
影响因子：
2.5
作者：
Agnes Mittermayr;T. F. Hansen;U. Sommer
通讯作者：
Agnes Mittermayr;T. F. Hansen;U. Sommer