Biologically induced alternative states in two rocky subtidal benthic communities
This thesis is concerned with the contrasting communities that occur in the subtidal zones of two closely situated islands in Saldanha Bay on the west coast of South Africa: Both are guano islands, supporting substantial populations of seabirds. They have a similar bottom topography and experience s...
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Format: | Doctoral Thesis |
Language: | English |
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University of Cape Town
2016
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Online Access: | http://hdl.handle.net/11427/21935 |
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ndltd-netd.ac.za-oai-union.ndltd.org-uct-oai-localhost-11427-219352020-07-22T05:07:52Z Biologically induced alternative states in two rocky subtidal benthic communities Barkai, Amos Branch, George M Zoology This thesis is concerned with the contrasting communities that occur in the subtidal zones of two closely situated islands in Saldanha Bay on the west coast of South Africa: Both are guano islands, supporting substantial populations of seabirds. They have a similar bottom topography and experience similar physical conditions. Despite these similarities their subtidal benthic communities are however, radically different. Marcus Island has prolific beds of the black mussel Choromytilus meridionalis, accompanied by a large number of other species, notably the sea urchin Parechinus angulosus, the holothurians Pentacta doliolum, Thyone aurea and Trachythyone insolens, large population of whelks, mostly Burnupena spp. and the barnacles Austromegabalanus cylindricus and Notomegabalanus algicola. In contrast, Malgas Island is dominated by a large population of the rock lobster Jasus lalandii together with a dense seaweed flora, and has small numbers of the ribbed mussel Aulacomya ater and the whelks Argobuccinum pustulosum and Burnupena papyracea. 2016-09-25T16:51:52Z 2016-09-25T16:51:52Z 1987 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/21935 eng application/pdf University of Cape Town Faculty of Science Department of Biological Sciences |
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English |
format |
Doctoral Thesis |
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Zoology |
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Zoology Barkai, Amos Biologically induced alternative states in two rocky subtidal benthic communities |
description |
This thesis is concerned with the contrasting communities that occur in the subtidal zones of two closely situated islands in Saldanha Bay on the west coast of South Africa: Both are guano islands, supporting substantial populations of seabirds. They have a similar bottom topography and experience similar physical conditions. Despite these similarities their subtidal benthic communities are however, radically different. Marcus Island has prolific beds of the black mussel Choromytilus meridionalis, accompanied by a large number of other species, notably the sea urchin Parechinus angulosus, the holothurians Pentacta doliolum, Thyone aurea and Trachythyone insolens, large population of whelks, mostly Burnupena spp. and the barnacles Austromegabalanus cylindricus and Notomegabalanus algicola. In contrast, Malgas Island is dominated by a large population of the rock lobster Jasus lalandii together with a dense seaweed flora, and has small numbers of the ribbed mussel Aulacomya ater and the whelks Argobuccinum pustulosum and Burnupena papyracea. |
author2 |
Branch, George M |
author_facet |
Branch, George M Barkai, Amos |
author |
Barkai, Amos |
author_sort |
Barkai, Amos |
title |
Biologically induced alternative states in two rocky subtidal benthic communities |
title_short |
Biologically induced alternative states in two rocky subtidal benthic communities |
title_full |
Biologically induced alternative states in two rocky subtidal benthic communities |
title_fullStr |
Biologically induced alternative states in two rocky subtidal benthic communities |
title_full_unstemmed |
Biologically induced alternative states in two rocky subtidal benthic communities |
title_sort |
biologically induced alternative states in two rocky subtidal benthic communities |
publisher |
University of Cape Town |
publishDate |
2016 |
url |
http://hdl.handle.net/11427/21935 |
work_keys_str_mv |
AT barkaiamos biologicallyinducedalternativestatesintworockysubtidalbenthiccommunities |
_version_ |
1719330989113606144 |