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Long-term colonization of a subarctic pre-planned artificial reef system in Whittier, Alaska

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https://ir.library.oregonstate.edu/concern/defaults/ws859g98t

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  • ABSTRACT: In 2006 Alaska’s first artificial reef (AR) was deployed as mitigation for habitat lost due to coastal development. Surveys conducted the following year suggested AR assemblages resembled those of adjacent natural reefs (NR). However, there is little known about the ecological succession of AR’s long-term in high latitude locations. Therefore, long-term surveying of community composition is necessary to know if AR’s will display ecological succession similar to natural reefs over longer temporal scales. Dive based surveys were conducted June-December 2016 to document the community composition of demersal fish, macroalgal and invertebrate assemblages. Assemblages were pairwise tested for differences in year, reef type and season, and between two methods commonly applied in quadrat sampling. Sebastes spp. Was the dominant family present, There was a shift in dominant macroalgae from Laminaria saccharina to Agarum clathratum, and richness increased significantly from 2 species in 2007 to 12 species in 2016 indicating macroalgae in Alaska are particularly sensitive to ecological succession. Although fish and invertebrate densities were higher at fish havens, there were few other discernable differences between reef type and seasonality was not significant.The AR in Whittier appeared to follow a successional pattern characteristic of Alaska rocky reefs, and has surpassed the AR in 2007 in terms of diversity for fish and macroalgae.
  • KEYWORDS: Succession, temporal, high latitude, kelp
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file details Whittier_Manuscript_4.28.pdf 2017-07-21 Público Descargar