Marine Biology

, Volume 156, Issue 11, pp 2247–2254

Biodiversity and rockfish recruitment in sponge gardens and bioherms of southern British Columbia, Canada

Authors

    • Vancouver Aquarium
  • Kim W. Conway
    • Geological Survey of Canada
  • Donna M. Gibbs
    • Vancouver Aquarium
    • Pacific Marine Life Surveys
  • Andy Lamb
    • Pacific Marine Life Surveys
  • Charles Gibbs
    • Pacific Marine Life Surveys
Original Paper

DOI: 10.1007/s00227-009-1252-8

Cite this article as:
Marliave, J.B., Conway, K.W., Gibbs, D.M. et al. Mar Biol (2009) 156: 2247. doi:10.1007/s00227-009-1252-8

Abstract

In the Strait of Georgia and Howe Sound, British Columbia, colonies of individual cloud sponges, growing on rock (known as sponge gardens) receive resource subsidies from the high biodiversity of epifauna on adjacent rock habitats. Bioherms are reefs of glass sponges living on layers of dead sponges. In the same area as the sponge gardens, newly discovered bioherms in Howe Sound, BC (49.34.67 N, 123.16.26 W) at depths of 28- to 35-m are constructed exclusively by Aphrocallistes vastus, the cloud sponge. The sponge gardens had much higher taxon richness than the bioherms. The sponge garden had 106 species from 10 phyla, whereas the bioherm had only 15 species from 5 phyla. For recruiting juvenile rockfish (quillback, Sebastes maliger), the food subsidy of sponge gardens appears to be missing on bioherms of cloud sponge, where biodiversity is relatively low. While adult and subadult rockfishes (S. maliger, S. ruberrimus, S. proriger, and S. elongatus) were present on bioherms, no evidence for nursery recruitment of inshore rockfishes to bioherms was observed, whereas the sponge gardens supported high densities of newly recruited S. maliger, perhaps owing to the combination of both refuge and feeding opportunities. These results indicate that sponge gardens form a habitat for early stages of inshore S. maliger, whereas A. vastus bioherms are associated only with older juvenile and adult rockfishes.

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Copyright information

© Springer-Verlag 2009