Notodiscus (Charopidae) on South Georgia: some implications of shell size, shell shape, and site isolation in a singular sub-Antarctic land snail
Multivariate analysis shows that shells of Notodiscus sp. (Charopidae: Pulmonata) reported from South Georgia are smaller and proportionately taller than, but otherwise similar to, populations of Notodiscus hookeri (Reeve) from Iles Crozet and Iles Kerguelen. The origin of this solitary, and spatial...
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ftangliruskinfig:oai:figshare.com:article/23773767 2023-11-12T04:08:21+01:00 Notodiscus (Charopidae) on South Georgia: some implications of shell size, shell shape, and site isolation in a singular sub-Antarctic land snail Philip J. A. Pugh Ronald I. Lewis Smith 2011-10-01T00:00:00Z https://figshare.com/articles/journal_contribution/Notodiscus_Charopidae_on_South_Georgia_some_implications_of_shell_size_shell_shape_and_site_isolation_in_a_singular_sub-Antarctic_land_snail/23773767 unknown 10779/aru.23773767.v1 https://figshare.com/articles/journal_contribution/Notodiscus_Charopidae_on_South_Georgia_some_implications_of_shell_size_shell_shape_and_site_isolation_in_a_singular_sub-Antarctic_land_snail/23773767 CC BY 4.0 research Text Journal contribution 2011 ftangliruskinfig 2023-10-13T12:23:12Z Multivariate analysis shows that shells of Notodiscus sp. (Charopidae: Pulmonata) reported from South Georgia are smaller and proportionately taller than, but otherwise similar to, populations of Notodiscus hookeri (Reeve) from Iles Crozet and Iles Kerguelen. The origin of this solitary, and spatially limited, South Georgia population is enigmatic. It is confined to a remarkably small coastal lowland site which was glaciated at Last Glacial Maximum, precluding a Tertiary relict origin, and on the leeward north-east coast, ruling out post-glacial ocean rafting. The site is close to the King Edward Point settlement, yet the absence of any logistics connections with the Iles Crozet or Iles Kerguelen mitigates against anthropogenic introduction. The close proximity of the population to nests of blue-eyed shag (Phalacrocorax atriceps), Dominican gull (Larus dominicanus) and light-mantled sooty albatross (Phoebetria palpebrata) could imply the snail was originally introduced to South Georgia via these ocean transiting seabirds. Article in Journal/Newspaper Antarc* Antarctic Blue Eyed Shag Phalacrocorax atriceps Anglia Ruskin University: Figshare Antarctic Kerguelen King Edward Point ENVELOPE(-36.496,-36.496,-54.284,-54.284) |
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Anglia Ruskin University: Figshare |
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research Philip J. A. Pugh Ronald I. Lewis Smith Notodiscus (Charopidae) on South Georgia: some implications of shell size, shell shape, and site isolation in a singular sub-Antarctic land snail |
topic_facet |
research |
description |
Multivariate analysis shows that shells of Notodiscus sp. (Charopidae: Pulmonata) reported from South Georgia are smaller and proportionately taller than, but otherwise similar to, populations of Notodiscus hookeri (Reeve) from Iles Crozet and Iles Kerguelen. The origin of this solitary, and spatially limited, South Georgia population is enigmatic. It is confined to a remarkably small coastal lowland site which was glaciated at Last Glacial Maximum, precluding a Tertiary relict origin, and on the leeward north-east coast, ruling out post-glacial ocean rafting. The site is close to the King Edward Point settlement, yet the absence of any logistics connections with the Iles Crozet or Iles Kerguelen mitigates against anthropogenic introduction. The close proximity of the population to nests of blue-eyed shag (Phalacrocorax atriceps), Dominican gull (Larus dominicanus) and light-mantled sooty albatross (Phoebetria palpebrata) could imply the snail was originally introduced to South Georgia via these ocean transiting seabirds. |
format |
Article in Journal/Newspaper |
author |
Philip J. A. Pugh Ronald I. Lewis Smith |
author_facet |
Philip J. A. Pugh Ronald I. Lewis Smith |
author_sort |
Philip J. A. Pugh |
title |
Notodiscus (Charopidae) on South Georgia: some implications of shell size, shell shape, and site isolation in a singular sub-Antarctic land snail |
title_short |
Notodiscus (Charopidae) on South Georgia: some implications of shell size, shell shape, and site isolation in a singular sub-Antarctic land snail |
title_full |
Notodiscus (Charopidae) on South Georgia: some implications of shell size, shell shape, and site isolation in a singular sub-Antarctic land snail |
title_fullStr |
Notodiscus (Charopidae) on South Georgia: some implications of shell size, shell shape, and site isolation in a singular sub-Antarctic land snail |
title_full_unstemmed |
Notodiscus (Charopidae) on South Georgia: some implications of shell size, shell shape, and site isolation in a singular sub-Antarctic land snail |
title_sort |
notodiscus (charopidae) on south georgia: some implications of shell size, shell shape, and site isolation in a singular sub-antarctic land snail |
publishDate |
2011 |
url |
https://figshare.com/articles/journal_contribution/Notodiscus_Charopidae_on_South_Georgia_some_implications_of_shell_size_shell_shape_and_site_isolation_in_a_singular_sub-Antarctic_land_snail/23773767 |
long_lat |
ENVELOPE(-36.496,-36.496,-54.284,-54.284) |
geographic |
Antarctic Kerguelen King Edward Point |
geographic_facet |
Antarctic Kerguelen King Edward Point |
genre |
Antarc* Antarctic Blue Eyed Shag Phalacrocorax atriceps |
genre_facet |
Antarc* Antarctic Blue Eyed Shag Phalacrocorax atriceps |
op_relation |
10779/aru.23773767.v1 https://figshare.com/articles/journal_contribution/Notodiscus_Charopidae_on_South_Georgia_some_implications_of_shell_size_shell_shape_and_site_isolation_in_a_singular_sub-Antarctic_land_snail/23773767 |
op_rights |
CC BY 4.0 |
_version_ |
1782328672199376896 |