Translator Disclaimer
1 December 2006 HYDROLOGY AND NUTRIENT EFFECTS ON FOOD-WEB STRUCTURE IN TEN LAKE SUPERIOR COASTAL WETLANDS
Author Affiliations +
Abstract

We examined the effects of hydrology and nutrients on the food webs of ten coastal wetlands on Lake Superior, using published stable isotope food web data for three wetlands and original data from seven additional systems in order to span regional hydrologic and nutrient enrichment gradients. We used a dual-source isotope mixing model to estimate the proportion of carbon in fish that originated from planktonic versus periphytic invertebrates, and we related carbon source to 1) nutrient enrichment, 2) hydraulic residence time, and 3) an index of nutrient loading that incorporates residence time and nutrient concentrations. There was no relationship between nutrient enrichment and the proportion of planktonic versus periphytic C in fish. Proportion of planktonic C in fish increased significantly with hydraulic residence time (F  =  5.68, R2  =  0.42, p  =  0.044). Riverine wetlands generally had lowest proportions of planktonic C in fish, dendritic wetlands were intermediate, and lagoon wetlands had highest proportions. A regression between the loading index and planktonic C in fish was an improvement over the residence time regression (F  =  11.7, R2  =  0.59, p  =  0.009). We conclude that coastal wetland food webs are strongly affected by hydrology and further by nutrient enrichment. This work has implications for the development of food web-based ecological indicators of nutrient enrichment and the use of hydrology as a classification factor in the prediction of nutrient effects on food webs.

Michael E. Sierszen, Gregory S. Peterson, Anett S. Trebitz, John C. Brazner, and Corlis W. West "HYDROLOGY AND NUTRIENT EFFECTS ON FOOD-WEB STRUCTURE IN TEN LAKE SUPERIOR COASTAL WETLANDS," Wetlands 26(4), 951-964, (1 December 2006). https://doi.org/10.1672/0277-5212(2006)26[951:HANEOF]2.0.CO;2
Received: 15 October 2004; Accepted: 1 August 2006; Published: 1 December 2006
JOURNAL ARTICLE
14 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top