Antarctic sessile marine benthos: colonisation and growth on artificial substrata over three years

Bowden, David A.; Clarke, Andrew ORCID:; Peck, Lloyd S. ORCID:; Barnes, David K.A. ORCID: 2006 Antarctic sessile marine benthos: colonisation and growth on artificial substrata over three years. Marine Ecology Progress Series, 316. 1-16.

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The development of sessile invertebrate assemblages on hard substrata has been studied extensively in temperate and tropical latitudes. Such studies provide insights into a range of ecological processes, and the global similarity of taxa recruiting to these assemblages affords the potential for regional-scale comparisons. However, few data exist for high latitude assemblages. This paper presents the first regularly resurveyed study of benthic colonisation from within the Antarctic Circle. Acrylic panels were deployed horizontally on the seabed at 8 and 20 m depths at each of 3 locations in Ryder Bay, Adelaide Island, SW Antarctic Peninsula (67° 35’ S, 68° 10’ W). Assemblages colonising upward- and downward-facing panel surfaces were photographed in situ from February 2001 to March 2004. Assemblages were dominated by bryozoans and spirorbid polychaetes. Total coverage after 3 yr ranged from 6 to 100% on downward-facing surfaces but was <10% on all upward-facing surfaces. Overall colonisation rates were up to 3 times slower than comparable temperate latitude assemblages but showed unexpected similarities with a tropical assemblage. Growth in most taxa was highly seasonal and maximum growth rates of encrusting bryozoans were 5 to 10 times slower than literature values for temperate species, suggesting rate limitation by cold rather than food availability. Assemblage development was controlled predominantly by post-settlement disturbances, and there was considerable variability between locations associated with differences in disturbance history. Ice impact was significant only at 8 m but biotic disturbances exerted a stronger and more consistent influence on assemblage development at all sites. It is suggested that the combination of slow growth rates and strong environmental seasonality results in succession being more predictable than in comparable temperate or tropical assemblages.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Biodiversity, Functions, Limits and Adaptation from Molecules to Ecosystems
ISSN: 0171-8630
Additional Information. Not used in RCUK Gateway to Research.: Full text not available from this repository
Additional Keywords: Fauna ; Benthic
NORA Subject Terms: Zoology
Ecology and Environment
Date made live: 22 Aug 2007 14:28 +0 (UTC)

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