Geographic Variation in Western Atlantic Populations of Gammarus oceanicus Segerstråle (Amphipoda)
1. In New Hampshire populations of the circum-Atlantic species Gammarus oceanicus, 18 morphological characters were examined; ten of these characteristics were different and related to coastal or estuary habitats. 2. Comparisons of five characters in populations from Massachusetts to Hudson Bay, Can...
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University of New Hampshire Scholars' Repository
1977
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ftuninhampshire:oai:scholars.unh.edu:jel-1189 2023-05-15T16:35:28+02:00 Geographic Variation in Western Atlantic Populations of Gammarus oceanicus Segerstråle (Amphipoda) Croker, Robert A. Gable, Michael F. 1977-01-01T08:00:00Z https://scholars.unh.edu/jel/631 https://doi.org/10.1163/156854077X00872 unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/jel/631 https://doi.org/10.1163/156854077X00872 Crustaceana © 1977 Jackson Estuarine Laboratory text 1977 ftuninhampshire https://doi.org/10.1163/156854077X00872 2023-01-30T21:54:38Z 1. In New Hampshire populations of the circum-Atlantic species Gammarus oceanicus, 18 morphological characters were examined; ten of these characteristics were different and related to coastal or estuary habitats. 2. Comparisons of five characters in populations from Massachusetts to Hudson Bay, Canada supported this conclusion and showed that the differences were greatest between the populations of New Hampshire. 3. Six characters showed differences corresponding to the trends found in the G. locusta series from coastal to brackish and to those observed in species of the Zaddachi group in Europe, denoting a genetic basis for the variation. 4. The conjunction of characters not showing overlaps does not was not strong enough for us to recognize subspecies; the term neutral form was used. 5. Coastal forms and forms of estuaries would be inter-fertile in the laboratory but, it seems, with reduced chances of success. 6. The differentiation of the form of estuary, first in the southern part of the range of the species, is considered to be linked to the highly euryecid nature of G. oceanicus, to the absence of European species from the Zaddachi group, and at variable selection pressures from the local micro-environment Text Hudson Bay University of New Hampshire: Scholars Repository Canada Hudson Hudson Bay Crustaceana 32 1 55 76 |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
description |
1. In New Hampshire populations of the circum-Atlantic species Gammarus oceanicus, 18 morphological characters were examined; ten of these characteristics were different and related to coastal or estuary habitats. 2. Comparisons of five characters in populations from Massachusetts to Hudson Bay, Canada supported this conclusion and showed that the differences were greatest between the populations of New Hampshire. 3. Six characters showed differences corresponding to the trends found in the G. locusta series from coastal to brackish and to those observed in species of the Zaddachi group in Europe, denoting a genetic basis for the variation. 4. The conjunction of characters not showing overlaps does not was not strong enough for us to recognize subspecies; the term neutral form was used. 5. Coastal forms and forms of estuaries would be inter-fertile in the laboratory but, it seems, with reduced chances of success. 6. The differentiation of the form of estuary, first in the southern part of the range of the species, is considered to be linked to the highly euryecid nature of G. oceanicus, to the absence of European species from the Zaddachi group, and at variable selection pressures from the local micro-environment |
format |
Text |
author |
Croker, Robert A. Gable, Michael F. |
spellingShingle |
Croker, Robert A. Gable, Michael F. Geographic Variation in Western Atlantic Populations of Gammarus oceanicus Segerstråle (Amphipoda) |
author_facet |
Croker, Robert A. Gable, Michael F. |
author_sort |
Croker, Robert A. |
title |
Geographic Variation in Western Atlantic Populations of Gammarus oceanicus Segerstråle (Amphipoda) |
title_short |
Geographic Variation in Western Atlantic Populations of Gammarus oceanicus Segerstråle (Amphipoda) |
title_full |
Geographic Variation in Western Atlantic Populations of Gammarus oceanicus Segerstråle (Amphipoda) |
title_fullStr |
Geographic Variation in Western Atlantic Populations of Gammarus oceanicus Segerstråle (Amphipoda) |
title_full_unstemmed |
Geographic Variation in Western Atlantic Populations of Gammarus oceanicus Segerstråle (Amphipoda) |
title_sort |
geographic variation in western atlantic populations of gammarus oceanicus segerstråle (amphipoda) |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
1977 |
url |
https://scholars.unh.edu/jel/631 https://doi.org/10.1163/156854077X00872 |
geographic |
Canada Hudson Hudson Bay |
geographic_facet |
Canada Hudson Hudson Bay |
genre |
Hudson Bay |
genre_facet |
Hudson Bay |
op_source |
Jackson Estuarine Laboratory |
op_relation |
https://scholars.unh.edu/jel/631 https://doi.org/10.1163/156854077X00872 |
op_rights |
Crustaceana © 1977 |
op_doi |
https://doi.org/10.1163/156854077X00872 |
container_title |
Crustaceana |
container_volume |
32 |
container_issue |
1 |
container_start_page |
55 |
op_container_end_page |
76 |
_version_ |
1766025685944500224 |