Effect of Vallisneria americana (L.) on community structure and ecosystem function in lake mesocosms

被引:39
作者
Wigand, C
Wehr, J
Limburg, K
Gorham, B
Longergan, S
Findlay, S
机构
[1] Inst Ecosyst Studies, Millbrook, NY 12545 USA
[2] Fordham Univ, Louis Calder Ctr, Biol Stn, Armonk, NY 10504 USA
基金
美国国家科学基金会;
关键词
community structure; ecosystem function; Vallisneria; mesocosms; net primary production; nutrients;
D O I
10.1023/A:1003808220424
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Submerged aquatic vegetation is known as a key structural component and regulator in ecosystems. In this mesocosm study, we examine community- and system-level responses to the presence of Vallisneria americana (L), a deep-rooted macrophyte. Phytoplankton, bacteria and filamentous algal biomasses were significantly lowered in the presence of V. americana. In addition, mesocosms with macrophytes had significantly reduced porewater phosphate and iron, water column dissolved organic carbon and total suspended solids, but elevated sediment redox. All mesocosms were net autotrophic (gross primary production/respiration > 1). Compared to the macrophyte treatments, the control mesocosms had lower diel net primary production (NPP) midway through the experiment (d 16), but at the end of the experiment (d 36), the controls had the higher values, presumably due to increased filamentous algae. NPP and NPP/R were constant in the macrophyte treatments, whereas NPP/R increased significantly from middle to end of the experiment in the controls. We show that community and system-level responses to the presence of V. americana have significant consequences on system structure and function.
引用
收藏
页码:137 / 146
页数:10
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