Effects of productivity, consumers, competitors, and El Niño events on food chain patterns in a rocky intertidal community.

Effects of productivity, consumers, competitors, and El Niño events on food chain patterns in a rocky intertidal community. Research Abstract Details 

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Effects of productivity, consumers, competitors, and El Niño events on food chain patterns in a rocky intertidal community. Abstract Text:

J T Wootton,M E Power,R T Paine,C A Pfister,

We experimentally manipulated nutrient input to a rocky intertidal community, using nutrient-diffusing flowerpots, to determine (i) whether nutrients limited intertidal productivity, (ii) how a large-scale oceanographic disturbance (an El Niño event) affected patterns of nutrient limitation, (iii) the relative impacts of molluscan grazers and nutrient limitation, and (iv) if responses to experimental nutrient addition among trophic levels were more consistent with prey-dependent or ratio-dependent food chain models. Nutrients measurably increased the abundance of micrograzers (amphipods and chironomid larvae), but not algal biomass, during the summer of an El Niño year. Nutrients had no effects in two non-El Niño years and during the autumn of an El Niño year. Adding nutrients did not affect food chain stability as assessed by temporal variation in algal biomass and micrograzer abundance. Large molluscan grazers caused large reductions in micrograzers and smaller reductions in algae, indicating consistent consumer effects. The results demonstrate that in this intertidal community, nutrient limitation can occur under conditions of nutrient stress, that top-down grazing effects are typically stronger than bottom-up nutrient effects, and that prey-dependent models are more appropriate than ratio-dependent models.

Effects of productivity, consumers, competitors, and El Niño events on food chain patterns in a rocky intertidal community. Publishing Authors By Initials

JT Wootton,ME Power,RT Paine,CA Pfister,

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Effects of productivity, consumers, competitors, and El Niño events on food chain patterns in a rocky intertidal community. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Proceedings of the National Academy of Sciences of

VOLUME: 93

Page Numbers: 13855-8

Journal Abbreviation: Proc. Natl. Acad. Sci. U.S.A.

ISSN: 0027-8424

DAY: 26

MONTH: Nov

YEAR: 1996

Effects of productivity, consumers, competitors, and El Niño events on food chain patterns in a rocky intertidal community. Information

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LANGUAGE: eng

NlmUniqueID: 7505876

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Grant and Affiliation Information for Effects of productivity, consumers, competitors, and El Niño events on food chain patterns in a rocky intertidal community.

AFFILIATION: Department of Ecology and Evolution, University of Chicago, 1101 East 57th Street, Chicago, IL 60637.

Country: United States

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MEDLINETA: Proc Natl Acad Sci U S A

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