Journal
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
Volume 70, Issue 7, Pages 941-952Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfas-2012-0391
Keywords
-
Categories
Funding
- US Environmental Protection Agency [R830669]
- National Science Foundation's North Temperate Lakes Long-Term Ecological Research Program [DEB-0217533]
- EPA [1099965, R830669] Funding Source: Federal RePORTER
- Direct For Biological Sciences
- Division Of Environmental Biology [822700] Funding Source: National Science Foundation
Ask authors/readers for more resources
Internal regulatory controls of phosphorus (P) via iron (Fe) scavenging were quantified in four contrasting dimictic Wisconsin lakes: Mendota (eutrophic, calcareous), Fish (mesotrophic, calcareous), Devil's (mesotrophic, noncalcareous), and Sparkling (oligotrophic, noncalcareous). Hypolimnetic enrichment of P was highest in Mendota and Devil's and least in Fish and Sparkling. This enrichment was attributed mainly to internal loading in the noncalcareous lakes and regeneration of sedimenting epilimnetic P in the calcareous lakes. Differences in Fe scavenging efficiencies at fall turnover were related to hypolimnetic Fe: P molar ratios as well as Fe availability and its control by sulfate-sulfide chemistries. In the noncalcareous lakes with high hypolimnetic Fe enrichment (Fe:P > 2), 45% of whole-lake total P was removed. P removal was low (<20%) in the two calcareous lakes with minimal Fe enrichment (Fe:P < 2). These differences in hypolimnetic P enrichment and subsequent Fe scavenging at fall turnover help to explain the differences in the amount of P available for subsequent spring and summer primary production as well as the differences in trophic state of the four lakes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available