Food-web structure of seagrass communities across different spatial scales and human impacts.
Food-web structure of seagrass communities across different spatial scales and human impacts.
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DOI：
10.1371/journal.pone.0022591
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Lotze HK
中科院分区：
文献类型：
--
作者：
Coll M;Schmidt A;Romanuk T;Lotze HK
海草床为各种海洋物种提供了重要的栖息地，但在沿海沃茨受到多种人类影响的威胁。虽然海草群落在该领域得到了很好的研究，但缺乏对其食物网结构和功能的量化，以及这些结构和功能如何在空间和人类影响中发生变化。出于广泛的实地调查和文献信息，我们分析了在加拿大大西洋3个省的16个研究地点与大叶藻marina相关的食物网的结构特征。我们的目标是：（一）量化食物网结构的差异，在当地和区域尺度和人类的影响，（二）评估的鲁棒性海草网模拟物种的损失，和（三）比较食物网结构在温带大西洋海草床与其他水生生态系统。我们为每个研究地点构建了单独的食物网，并根据物种的存在/不存在为每个省和整个地区构建了累积食物网，并计算了每个食物网的16个结构特性。我们的研究结果表明，食物网结构是相似的低影响网站跨地区。然而，随着人类对富营养化的影响越来越大，食物网结构显示出退化的迹象，表现为营养类群减少，最高捕食者的最高营养水平降低，连接顶部和基底物种的营养链减少，食草动物和中间消费者的比例增加，以及每个物种的猎物数量增加。这些结构变化转化为功能变化，受影响的网站对模拟物种损失的鲁棒性较低。温带大西洋海草网与热带海草网相似，但与其他水生网不同，这表明不同区域海草生态系统的食物网特征一致。我们的研究表明，海草栖息地的食物网结构和功能会随着人类影响而变化，并且食物网分析的空间尺度对于确定结果至关重要。
Seagrass beds provide important habitat for a wide range of marine species but are threatened by multiple human impacts in coastal waters. Although seagrass communities have been well-studied in the field, a quantification of their food-web structure and functioning, and how these change across space and human impacts has been lacking. Motivated by extensive field surveys and literature information, we analyzed the structural features of food webs associated with Zostera marina across 16 study sites in 3 provinces in Atlantic Canada. Our goals were to (i) quantify differences in food-web structure across local and regional scales and human impacts, (ii) assess the robustness of seagrass webs to simulated species loss, and (iii) compare food-web structure in temperate Atlantic seagrass beds with those of other aquatic ecosystems. We constructed individual food webs for each study site and cumulative webs for each province and the entire region based on presence/absence of species, and calculated 16 structural properties for each web. Our results indicate that food-web structure was similar among low impact sites across regions. With increasing human impacts associated with eutrophication, however, food-web structure show evidence of degradation as indicated by fewer trophic groups, lower maximum trophic level of the highest top predator, fewer trophic links connecting top to basal species, higher fractions of herbivores and intermediate consumers, and higher number of prey per species. These structural changes translate into functional changes with impacted sites being less robust to simulated species loss. Temperate Atlantic seagrass webs are similar to a tropical seagrass web, yet differed from other aquatic webs, suggesting consistent food-web characteristics across seagrass ecosystems in different regions. Our study illustrates that food-web structure and functioning of seagrass habitats change with human impacts and that the spatial scale of food-web analysis is critical for determining results.
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DOI：
10.1073/pnas.0501562102
发表时间：
2005-04-12
影响因子：
11.1
作者：
Bascompte, J;Melián, CJ;Sala, E
通讯作者：
Sala, E
影响因子：
4.5
作者：
Breitburg, DL;Sanders, JG;Sellner, KG
通讯作者：
Sellner, KG
影响因子：
64.8
作者：
Costanza, R;dArge, R;vandenBelt, M
通讯作者：
vandenBelt, M
影响因子：
3.1
作者：
CHRISTENSEN, V
通讯作者：
CHRISTENSEN, V
影响因子：
56.9
作者：
Lotze, Heike K.;Lenihan, Hunter S.;Jackson, Jeremy B. C.
通讯作者：
Jackson, Jeremy B. C.