Habitat decoupling via saltmarsh creek geomorphology alters connection between spatially- coupled food webs
Habitat decoupling via saltmarsh creek geomorphology alters connection between spatially- coupled food webs
复制标题
通过盐沼溪地貌的栖息地脱钩改变了空间耦合食物网之间的联系
DOI：
10.1016/j.ecss.2020.106825
复制
发表时间：
2021
期刊：
影响因子：
1.7
通讯作者：
Nelson, J. A.
中科院分区：
文献类型：
--
作者：
Lesser, J. S.;Floyd O.;Fedors K.;Deegan L. A.;Johnson, D. S.;Nelson, J. A.
消费者介导的运动可以耦合不同栖息地的食物网，并促进它们之间的能量流动。在新英格兰的盐沼，mummichog（底栖动物heteroclitus）使用洪水大潮访问高沼泽平台和吃无脊椎动物的猎物，耦合高沼泽和水生小溪食物网通过收集高沼泽产生的能量，使其提供给水生食物网。盐沼小溪边缘的地貌变化极大地影响了mummichog种群的生存，生物量和资源利用。在这里，我们使用肠道内容物分析和实地调查，以量化的影响改变溪边缘地貌的mummichog捕食陆地无脊椎动物猎物上发现的高沼泽表面。鱼类种群的小溪，更大的连通性有较高的总生物量的陆生无脊椎动物在他们的肠道。然而，炸弹量热法显示，不同的小溪边缘地貌的mummichog个人的平均热量含量没有差异。此外，我们没有观察到这些小溪的mummichog的生物量和长度分布之间的差异。虽然改变小溪边缘地貌没有影响的条件下，个别mummichog，它确实减少了mummichog的总数支持的沼泽小溪，因此减少了高沼泽生产通量的mummichog的水生栖息地的总量，减少陆地和水生食物网之间的耦合。
Consumer-mediated movement can couple food webs in distinct habitats and facilitate energy flow between them. In New England saltmarshes, mummichog (Fundulus heteroclitus) use the flooding spring tides to access the high marsh platform and eat invertebrate prey, coupling the high marsh and aquatic creek food webs by gathering energy produced on the high marsh and making it available to the aquatic food web. Changes in the geomorphology of saltmarsh creek edges greatly influence the survival, biomass, and resource use of mummichog populations. Here, we use gut content analysis and field surveys to quantify the effect of altered creek edge geomorphology of mummichog predation on terrestrial invertebrate prey found on the high marsh surface. Fish populations in creeks with greater connectivity had a higher total biomass of terrestrial invertebrates in their guts. However, bomb calorimetry showed no difference in the average caloric content of mummichog individuals from creeks with different creek edge geomorphology. Additionally, we did not observe differences between the biomass and length distributions of mummichog in those creeks. While altered creek edge geomorphology has no effect the condition of the individual mummichog, it does decrease the total number of mummichog supported by a marsh creek and therefore decreases the total amount of high marsh production fluxed by mummichog to the aquatic habitat, decreasing coupling between the terrestrial and aquatic food webs.