Direct and indirect effects of the introduced alga Sargassum muticum on benthic, subtidal communities of Washington State, USA
2004; Inter-Research; Volume: 277; Linguagem: Inglês
10.3354/meps277061
ISSN1616-1599
Autores Tópico(s)Cephalopods and Marine Biology
ResumoMEPS Marine Ecology Progress Series Contact the journal Facebook (Twitter) RSS Mailing List Receive regular lists of newly published MEPS articles via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 277:61-78 (2004) - doi:10.3354/meps277061 Direct and indirect effects of the introduced alga Sargassum muticum on benthic, subtidal communities of Washington State, USA Kevin H. Britton-Simmons1,* Department of Ecology and Evolution, The University of Chicago, 1101 East 57th Street, Chicago, Illinois 60637, USA 1Present address: University of Washington, Friday Harbor Laboratories, 620 University Road, Friday Harbor, Washington 98250, USA *Email: aquaman@kevinbs.net ABSTRACT: Introduced algae have become a prominent component of the marine flora in many regions worldwide. In the NE Pacific, the introduced Japanese alga Sargassum muticum (Yendo) Fensholt is common and abundant in shallow, subtidal, rocky habitats, but its effects on subtidal, benthic communities in this region have not previously been studied. I measured the response of native species to experimental manipulation of S. muticum in field experiments in the San Juan Islands of Washington State. Native canopy (brown) and understory (red) algae were more abundant in plots from which S. muticum had been removed, and the native kelp Laminaria bongardiana (the most abundant species of brown alga in the absence of S. muticum) grew more than twice as fast in plots where S. muticum was absent. The negative effects of S. muticum on native algae appear to be a result of shading, rather than changes in water flow, sedimentation, or nutrient availability. S. muticum also had a strongly negative indirect effect on the native sea urchin Stronglyocentrotus droebachiensis by reducing abundances of the native kelp species on which it prefers to feed. My results indicate that S. muticum has a substantial impact on native communities in this region, including effects at multiple trophic levels. Because of their worldwide distribution and capacity to alter native communities, non-indigenous algae are potentially important agents of global ecological change. KEY WORDS: Sargassum muticum · Introduced algae · Competition · Indirect effects · Stronglylocentrotus droebachiensis · Shading Full text in pdf format Export citation Share: Facebook - - linkedIn Cited by Published in MEPS Vol. 277. Online publication date: August 16, 2004 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2004 Inter-Research. Previous article Next article
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