《Wetland》杂志刊登“受资源和扰动梯度影响的沼泽湿地集合群落结构研究”

作者：Eric R.Sokol, J.Matthew Hoch, Evelyn Gaiser, Joel C.Trexler

刊物：《Wetland》2013年4月

关键词：基于小生境模型；分散；集合群落；群落结构；群落富集；方差分解

摘要：本研究以南部沼泽地的无脊椎动物和鱼类群落为例，评估了景观布局（反映扩散限制）和环境梯度（水文周期和营养）的集合群落学说。我们从南部沼泽地的东部边界和鲨鱼河沼泽选择样点收集样本，评估这些因素在集合群落结构中的作用。我们采用特征函数空间分析来模拟群落结构，并采用基于距离的冗余分析方法来区分空间与环境要素之间群落的可变性。对于大多数动物群落，水文参数和营养物质都对群落结构有很大的影响，然而水文参数对群落结构的影响更大。扩散限制的空间效应较弱，似乎只有底栖动物的扩散受区域限制。在景观尺度上，群落充分混合，但是受水文影响较强烈。本地物种的优势受耐水性和营养物富集的影响。营养物的丰度与水源密切相关，这也可以解释了其对这些数据的影响。水文周期和营养物丰度是由水管理者控制，我们的分析表明水管理者的决策对沼泽地食物网中的生物群落有很大的影响。

Metacommunity Structure Along Resource and Disturbance Gradients in Everglades Wetlands

Authors: Eric R.Sokol, J.Matthew Hoch, Evelyn Gaiser, Joel C.Trexler

Journal:Wetlands,April 2013

Key words:Niche-based model; Dispersal; Metacommunity; Community structure; Communtiy assembly; Variation partitioning

Abstract: We evaluated metacommunity hypotheses of landscape arrangement (indicative of dispersal limitation) and environmental gradients (hydroperiod and nutrients) in structuring macroinvertebrate and fish communities in the southern Everglades. We used samples collected at sites from the eastern boundary of the southern Everglades and from Shark River Slough, to evaluate the role of these factors in metacommunity structure. We used eigenfunction spatial analysis to model community structure among sites and distance-based redundancy analysis to partition the variability in communities between spatial and environmental filters. For most animal communities, hydrological parameters had a greater influence on structure than nutrient enrichment, however both had large effects. The influence of spatial effects indicative of dispersal limitation was weak and only periphyton infauna appeared to be limited by regional dispersal. At the landscape scale, communities were well-mixed, but strongly influenced by hydrology. Local-scale species dominance was influenced by water-permanence and nutrient enrichment. Nutrient enrichment is limited to water inflow points associated with canals, which may explain its impact in this data set. Hydroperiod and nutrient enrichment are controlled by water managers; our analysis indicates that the decisions they make have strong effects on the communities at the base of the Everglades food web.

原文链接：http://link.springer.com/article/10.1007/s13157-013-0413-1