Epibiota communities of the introduced and indigenous macroalgal relatives Sargassum muticum and Halidrys siliquosa in Limfjorden (Denmark)
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- 作者：Thomas Wernberg (1) (2)
Mads S. Thomsen (1) (3)
Peter A. Staehr (1) (4)
Morten F. Pedersen (1) - 关键词：Sargassum muticum ; Halidrys siliquosa ; Epibiota ; Canopy habitat ; Community structure
- 刊名：Helgoland Marine Research
- 出版年：2004
- 出版时间：October 2004
- 年：2004
- 卷：58
- 期：3
- 页码：154-161
- 全文大小：202KB
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Mads S. Thomsen (1) (3)
Peter A. Staehr (1) (4)
Morten F. Pedersen (1)
1. Department of Life Sciences and Chemistry 17.2, Roskilde University, P.O. Box 260, 4000, Roskilde, Denmark
2. Southern Seas Ecology Laboratories, DP 418, School of Earth & Environmental Sciences, University of Adelaide, 5005, Adelaide, SA, Australia
3. Department of Environmental Science, University of Virginia, Clark Hall, Charlottesville, VA, 22903, USA
4. Freshwater Biological Laboratory, University of Copenhagen, Helsing酶rgade 51, 3400, Hiller酶d, Denmark
文摘
Sargassum muticum (Phaeophyceae, Fucales) has recently been introduced to Limfjorden (Denmark) where its closest relative is the indigenous Halidrys siliquosa. Previous studies have demonstrated large quantitative (canopy biomass) and qualitative (canopy persistence) differences in the habitat available to epibiota within the canopies of these two macroalgae. We therefore hypothesised that these algae would support different epibiota communities and tested this by sampling the epibiota of S. muticum and H. siliquosa on seven occasions throughout 1997 by enclosing entire thalli in mesh bags. We found 53 epibiota taxa and, with only one exception, they were all recorded on both host species. Species richness and abundance of epibiota exhibited clear seasonal variation on both host species, although epibiota biomass was seasonally constant on H. siliquosa but not on S. muticum. These patterns were consistent with the different life histories of the host species. There was a weakly negative correlation between thallus size and epibiota biomass for both host species. When taking species-specific seasonal variation in thallus size into consideration, S. muticum and H. siliquosa were found to support significantly different epibiota biomasses. Multivariate analyses showed that epibiota community structure was different, although highly overlapping, between the two species, whereas there was an almost parallel temporal development in epibiota community structure. We conclude that it is unlikely that the introduction of S. muticum to Limfjorden has caused major changes in local epibiota community structure. However, the standing stock of epibiota is likely to have increased.