期刊
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
卷 66, 期 3, 页码 439-448出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/F09-008
关键词
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资金
- Connecticut Institute of Water Resources
- QLF/Atlantic Center
- US Environmental Protection Agency STAR Graduate Fellowship Award
- National Science Foundation [0717265]
- Direct For Biological Sciences
- Division Of Environmental Biology [0717265] Funding Source: National Science Foundation
Diadromous fish are an important link between marine and freshwater food webs. Pacific salmon (Oncorhynchus spp.) strongly impact nutrient dynamics in inland waters and anadromous alewife (Alosa pseudoharengus) may play a similar ecological role along the Atlantic coast. The annual spawning migration of anadromous alewife contributes, on average, 1050 g of nitrogen and 120 g of phosphorus to Bride Brood, Connecticut, USA, through excretion and mortality each year. Natural abundance stable isotope analyses indicate that this influx of marine-derived nitrogen is rapidly incorporated into the stream food web. An enriched delta N-15 signal, indicative of a marine origin, is present at all stream trophic levels with the greatest level of enrichment coincident with the timing of the anadromous alewife spawning migration. There was no significant effect of this nutrient influx on water chemistry, leaf decomposition, or periphyton accrual. Dam removal and fish ladder construction will allow anadromous alewife to regain access to historical freshwater spawning habitats, potentially impacting food web dynamics and nutrient cycling in coastal freshwater systems.
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