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The Biology and Ecology of Giant Kelp Forests$
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David R. Schiel and Michael S. Foster

Print publication date: 2015

Print ISBN-13: 9780520278868

Published to California Scholarship Online: January 2016

DOI: 10.1525/california/9780520278868.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2019. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 22 September 2019

Human Usage of Giant Kelp and Kelp Forest Organisms

Human Usage of Giant Kelp and Kelp Forest Organisms

Chapter:
(p.235) 11 Human Usage of Giant Kelp and Kelp Forest Organisms
Source:
The Biology and Ecology of Giant Kelp Forests
Author(s):

David R. Schiel

Michael S. Foster

Publisher:
University of California Press
DOI:10.1525/california/9780520278868.003.0011

This chapter discusses the anthropogenic effects on water quality and benthic habitats that negatively affect giant kelp growth and reproduction. These include activities that increase sedimentation, reduce light, and increase turbidity and temperature, causing the decline of Macrocystis. The most important effects of sewer effluent are on microscopic stages and small juvenile sporophytes whose survival and reproduction is inhibited by light reduction, scour, and burial as well as by toxic materials sorbed to particulate organic matter. Excess nutrients that reduce benthic light by stimulating phytoplankton growth may also encourage the growth of algal turfs that directly and indirectly inhibit recruitment of kelp and various large fucoids. Turf-sediment matrices have also been implicated in preventing recolonization of native algal species in Tasmania kelp communities. Ammonia can be toxic, and domestic sewage can contain toxic metals and organic compounds that may be increased if the discharge also contains industrial wastes.

Keywords:   anthropogenic effects, water quality, benthic habitats, giant kelp communities, Macrocystis, sewer effluent, algal turfs, turf-sediment matrices, ammonia

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