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• W2120908097 abstract "AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AB 16:17-30 (2012) - DOI: https://doi.org/10.3354/ab00419 Relative importance of kelps and fucoids as substrata of the invasive epiphytic bryozoan Membranipora membranacea in Nova Scotia, Canada Alana F. Yorke1, Anna Metaxas2,* 1Department of Biology, and 2Department of Oceanography, Dalhousie University, Halifax, Nova Scotia B3H R2, Canada *Email: metaxas@dal.ca ABSTRACT: The successful establishment of invasive species is partly dependent upon their ability to utilize effectively local resources available in the invaded ecosystem. In the rocky subtidal habitats of Nova Scotia, Canada, the invasive epifaunal bryozoan Membranipora membranacea occurs in high abundance on kelps, which offer high space availability but are highly dynamic. However, this bryozoan also occurs on algae other than kelps, including Fucus species, which provide low space availability but higher stability than kelp. Previous research has focussed on population dynamics of the bryozoan on kelps, and the role of fucoids remains unknown. We quantified settlers and colony cover of M. membranacea on the kelps Saccharina latissima and Laminaria digitata (both native), and on Fucus evanescens (native) and F. serratus (introduced), at 4 sites in Nova Scotia, at various stages critical to the population dynamics of the bryozoan. The relative importance of kelp and fucoid substrata varied both intra- and interannually, as well as spatially. Settlement was higher on kelps than on Fucus spp. at sites where kelps were abundant; however, the abundance of settlers on Fucus spp. was similar to or greater than that on kelps at sites where kelps were sparse or spatially separated from Fucus spp. During the period of high colony cover in late autumn, cover was highest on L. digitata and lowest on Fucus spp. across all sites. After the winter, M. membranacea cover decreased by an order of magnitude on kelps, but remained stable on Fucus spp., suggesting high overwinter survival on fucoid algae. While kelps provide spatial resources for seasonal peaks in abundance of the invasive bryozoan, refuges can preserve local populations at certain times. For example, Fucus spp. provides an important refuge for overwintering colonies, particularly where defoliation of kelps has been extensive, and characteristics of this substratum probably facilitate early reproduction and local spread. Understanding the role of different components of an invaded ecosystem in the population dynamics of the introduced species can invoke possible mechanisms of successful establishment, spread and persistence. KEY WORDS: Invasive species · Population dynamics · Benthic colonial organisms · Rocky subtidal habitats · Membranipora membranacea · Fucoids · Kelp · Refuge Full text in pdf format PreviousNextCite this article as: Yorke AF, Metaxas A (2012) Relative importance of kelps and fucoids as substrata of the invasive epiphytic bryozoan Membranipora membranacea in Nova Scotia, Canada. Aquat Biol 16:17-30. https://doi.org/10.3354/ab00419 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AB Vol. 16, No. 1. Online publication date: June 26, 2012 Print ISSN: 1864-7782; Online ISSN: 1864-7790 Copyright © 2012 Inter-Research." @default.
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• W2120908097 title "Relative importance of kelps and fucoids as substrata of the invasive epiphytic bryozoan Membranipora membranacea in Nova Scotia, Canada" @default.
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