nerc.ac.uk

Community recovery following catastrophic iceberg impacts in a soft-sediment shallow-water site at Signy Island, Antarctica

Peck, Lloyd S.; Brockington, Simon; Vanhove, Sandra; Beghyn, Myriam. 1999 Community recovery following catastrophic iceberg impacts in a soft-sediment shallow-water site at Signy Island, Antarctica. Marine Ecology Progress Series, 186. 1-8. 10.3354/meps186001

Full text not available from this repository. (Request a copy)

Abstract/Summary

Ice disturbance is possibly the major structuring element of polar nearshore biological communities. Effects range from encapsulation by ice forming on rock substrata to gouging and trampling by bergs. Some 15 to 20% of the world's oceans are affected by this phenomenon, yet measurements of the extent of biological destruction from iceberg impacts and subsequent community recovery are very rare. Communities can be held at early successional stages, or even completely destroyed by scouring, and these effects occur from the intertidal to depths around 500 m in Antarctica. The wide scales of disturbance intensity are thought to add to the overall high levels of Antarctic benthic biological diversity, which has recently been shown to be similar to tropical areas. Data here indicate >99.5 % removal of all macrofauna and >90 % removal of most meiofauna by iceberg impact on a soft-sediment habitat at Signy Island, Antarctica. Species return was via locomotion, advection or larval recolonisation, and all 3 mechanisms worked on different timescales. Locomotion caused groups to return within 10 d of an impact. Storms with wind speeds around 100 km h(-1) induced water movements intense enough to advect meiofauna to the 9 m depth site. However, it was only during the strongest storm which occurred during the study (maximum wind speed 148 km h(-1)) that water movements were powerful enough to redistribute small macrofauna such as the bivalve Mysella charcoti.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.3354/meps186001
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 0171-8630
Additional Keywords: Antarctica, iceberg, community, benthos, macrofauna, meiofauna, diversity
Date made live: 23 Oct 2013 10:26 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/503618

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...