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• W2102000411 abstract "AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AB 8:83-94 (2009) - DOI: https://doi.org/10.3354/ab00208 Population dynamics of a nonindigenous epiphytic bryozoan Membranipora membranacea in the western North Atlantic: effects of kelp substrate Megan I. Saunders*, Anna Metaxas Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, B3H 4J1, Canada *Email: msaunders@dal.ca ABSTRACT: In rocky subtidal ecosystems of the western North Atlantic, the nonindigenous epiphytic bryozoan Membranipora membranacea facilitates the introduction of other nonindigenous benthic species by defoliating kelps. Susceptibility to infestation by the bryozoan varies among kelp species, although the causes of this variability are not known. We monitored the percent cover of the bryozoan on Saccharina longicruris, Laminaria digitata, and Agarum clathratum, at 2 to 3 depths within 3 sites over 15 mo in 2005 to 2006. To infer mechanisms of observed differences in cover, we examined patterns of colony settlement and abundance, size-frequency distributions, and the proportion of plants with overwintering bryozoans on the respective kelp species. We also quantified the distributions and abundances of kelps before and after a major defoliation event in the fall of 2006. During the peak in abundance in fall, the highest percent cover of the bryozoan was consistently observed on L. digitata, which was achieved by colonies attaining larger sizes. The lowest cover and abundance were observed on A. clathratum, a pattern that we attributed to lower recruitment. Following an outbreak of the bryozoan in the fall of 2006, defoliation of the kelp bed was due to losses of individuals of S. longicruris, and to a lesser extent, A. clathratum, but not to losses of L. digitata, which increased in abundance at 1 location. Our results suggest that differences in the abundance of this introduced species among its algal hosts arise as a result of both differential settlement and survival. In turn, differential susceptibility among hosts to infestation may result in alteration of the algal community structure. KEY WORDS: Invasive species · Kelp beds · Rocky subtidal ecosystems · Epibiota · Bryozoa · Membranipora membranacea · Western North Atlantic Full text in pdf format PreviousNextCite this article as: Saunders MI, Metaxas A (2009) Population dynamics of a nonindigenous epiphytic bryozoan Membranipora membranacea in the western North Atlantic: effects of kelp substrate. Aquat Biol 8:83-94. https://doi.org/10.3354/ab00208 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AB Vol. 8, No. 1. Online publication date: December 28, 2009 Print ISSN: 1864-7782; Online ISSN: 1864-7790 Copyright © 2009 Inter-Research." @default.
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• W2102000411 title "Population dynamics of a nonindigenous epiphytic bryozoan Membranipora membranacea in the western North Atlantic: effects of kelp substrate" @default.
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