NDLI: The Relative Role of Nutrients, Grazing, and Predation as Controls on Macroalgal Growth in the Waquoit Bay Estuarine System

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The Relative Role of Nutrients, Grazing, and Predation as Controls on Macroalgal Growth in the Waquoit Bay Estuarine System

Content Provider	Springer Nature Link
Author	Fox, Sophia E. Teichberg, Mirta Valiela, Ivan Heffner, Leanna
Copyright Year	2012
Abstract	Understanding whether nutrient availability and grazing by consumers can control macroalgal growth is important to mitigate blooms. To assess the effect of long-term nitrogen loading on macroalgae, we ran a field experiment in which we measured growth of green and red macroalgae in estuaries where loads and eutrophication status differed. The relative abundances of consumers differed among estuaries with more grazers in non-eutrophied estuaries, an important interaction of bottom-up and top-down controls. In the estuary with the lowest nitrogen load, grazers controlled green macroalgal growth, but in higher nitrogen-loaded estuaries, where grazing was lower, growth of green macroalgae overwhelmed potential grazer control. The red macroalga was not controlled by grazers, even in the estuary where grazing pressure was highest. In the low-loaded estuary, invertebrate predators exerted top-down control over grazers, but predation effects did not cascade to macroalgae. Bottom-up mechanisms dominated control of macroalgae through an interaction of direct stimulation of growth and indirect alteration of consumer abundances, and thus, long-term nutrient regimes are likely determining potential for bloom formation in Waquoit Bay.
Starting Page	1193
Ending Page	1204
Page Count	12
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	35
Issue Number	5
e-ISSN	15592731
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-06-06
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Eutrophication Bottom-up Top-down Herbivory Nitrogen Environment Nature Conservation Freshwater & Marine Ecology Environmental Management Coastal Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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The Relative Role of Nutrients, Grazing, and Predation as Controls on Macroalgal Growth in the Waquoit Bay Estuarine System