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Grazing effects of the sea urchin, Centrostephanus rodgersii,in two contrasting rocky reef habitats: effects of urchins density and implications for the fishery

Citation

Hill, Nicole and Blount, C and Poore, AG and Worthington, D and Steinberg, PD, Grazing effects of the sea urchin, Centrostephanus rodgersii,in two contrasting rocky reef habitats: effects of urchins density and implications for the fishery, Marine & Freshwater Research, 54, (6) pp. 691-700. ISSN 1323-1650 (2003) [Refereed Article]

DOI: doi:10.1071/MF03052

Abstract

The sea urchin Centrostephanus rodgersii plays an important role in determining the abundance and composition of benthic macroalgae in New South Wales. Centrostephanus rodgersii is commonly found in areas devoid of foliose algae (termed 'barrens habitat'), which abruptly change into areas rich in foliose algae (termed 'fringe habitat'). Complementary experiments were used to investigate the impact of C. rodgersii grazing on algal assemblages at a range of densities in the barrens and fringe habitats. Although 33% of the natural density of C. rodgersii maintained barrens areas relatively free of foliose algae, only densities exceeding natural densities within barrens habitat cleared areas dominated by macroalgae. The impact of grazing was not linearly related to density in either habitat, which suggests that both the barrens and fringe habitats are stable and will persist unless there is a dramatic decrease in urchin densities in barrens areas or a large influx into fringe areas. These findings have significant implications for the commercial harvesting of C. rodgersii. They imply that reducing urchin densities in barrens habitats, or translocating urchins from barrens to fringe habitats in order to improve roe quality, will not significantly alter the algal assemblage of either habitat in the short term (less than 3 months).

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Fisheries - Wild Caught not elsewhere classified
Author:Hill, Nicole (Dr Nicole Hill)
ID Code:58232
Year Published:2003
Web of Science® Times Cited:29
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2009-09-22
Last Modified:2009-09-22
Downloads:0

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