Boundary Effects on Benthic Microbial Phosphorus Concentrations and Diatom Beta Diversity in a Hydrologically-modified, Nutrient-limited Wetland

被引:9
作者
Gaiser, Evelyn E. [1 ,2 ]
Sullivan, Pamela [1 ,2 ]
Tobias, Franco A. C. [1 ,2 ]
Bramburger, Andrew J. [3 ]
Trexler, Joel C. [1 ,2 ]
机构
[1] Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA
[2] Florida Int Univ, Southeast Environm Res Ctr, Miami, FL 33199 USA
[3] St Lawrence River Inst Environm Sci, Cornwall, ON K6H4Z1, Canada
基金
美国国家科学基金会;
关键词
Periphyton; Diatoms; Hydrology; Everglades; Wetlands; Beta diversity; EVERGLADES NATIONAL-PARK; FLORIDA EVERGLADES; PERIPHYTON; LANDSCAPE; ASSEMBLAGES; RESPONSES; USA; BIODIVERSITY; ENRICHMENT; VEGETATION;
D O I
10.1007/s13157-013-0379-z
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Water flow and flooding duration in wetlands influence the structure and productivity of microbial communities partly through their influence on nutrient loading. The effect of flow-regulated nutrient loads is especially relevant for microbial communities in nutrient-poor settings, where delivery controls nutrient uptake rates and the intensity of microbial interactions. We examined the effect of hydrologic history and proximity to water sources on nutrient enrichment of benthic microbial assemblages (periphyton) and on their diatom species composition, along the artificial boundaries of Taylor Slough, a historically phosphorus-depleted drainage of the Florida Everglades. Concentrations of phosphorus in periphyton declined from the wetland boundary near inflow structures to 100-m interior, with spatial and temporal variability in rates dependent on proximity to and magnitude of water flow. Phosphorus availability influenced the beta diversity of diatom assemblages, with higher values near inflow structures where resources were greatest, while interior sites and reference transects contained assemblages with constant composition of taxa considered endemic to the Everglades. This research shows how hydrologic restoration may have unintended consequences when incoming water quality is not regulated, including a replacement of distinctive microbial assemblages by ubiquitous, cosmopolitan ones.
引用
收藏
页码:S55 / S64
页数:10
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