Variations in numbers of median dorsal thorns and rows of teeth in thorny skate (Raja radiata) of the Northwest
Data on the number of median dorsal thorns (anterior to the first dorsal fin) and the number of rows of teeth of the thorny skate from various areas of the Northwest Atlantic in 1949-72 were analyzed. The results showed a cline of mean number of median dorsal thorns from the Baffin Island and Ungava...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.613.1561 2023-05-15T15:35:24+02:00 Variations in numbers of median dorsal thorns and rows of teeth in thorny skate (Raja radiata) of the Northwest Wilfred Templeman The Pennsylvania State University CiteSeerX Archives 1984 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.613.1561 http://journal.nafo.int/j05/templeman4.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.613.1561 http://journal.nafo.int/j05/templeman4.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://journal.nafo.int/j05/templeman4.pdf text 1984 ftciteseerx 2016-01-08T14:36:26Z Data on the number of median dorsal thorns (anterior to the first dorsal fin) and the number of rows of teeth of the thorny skate from various areas of the Northwest Atlantic in 1949-72 were analyzed. The results showed a cline of mean number of median dorsal thorns from the Baffin Island and Ungava Bay areas southward along Labrador and eastern Newfoundland to the Grand Bank and thence westward to the Gulf of St. Lawrence, Scotian Shelf and Georges Bank, the higher numbers occurring at lower developmental temperatures and vice versa. The mean tooth-row counts showed a cline which was opposite to that for median dorsal thorns, increasing from the Baffin Island and Ungava Bay areas southward to the Scotian Shelf and Georges Bank. There was a slight tendency toward increased tooth-row numbers with fish length, but the within-area differences were not significant for lengths greater than 24 em which were used in the comparisons among areas. Males tended to have slightly more rows of teeth than females, but there was no clear evidence of sexual dimorphism. The number of tooth-rows in the lower jaw was, on the average, slightly higher than in the upper jaw, but the upper-jaw counts exceeded the lower-jaw counts in small samples from the geographical extremes of the populations studied. Text Baffin Island Baffin Newfoundland Northwest Atlantic Ungava Bay Unknown Baffin Island Newfoundland Ungava Bay ENVELOPE(-67.489,-67.489,59.498,59.498) |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
description |
Data on the number of median dorsal thorns (anterior to the first dorsal fin) and the number of rows of teeth of the thorny skate from various areas of the Northwest Atlantic in 1949-72 were analyzed. The results showed a cline of mean number of median dorsal thorns from the Baffin Island and Ungava Bay areas southward along Labrador and eastern Newfoundland to the Grand Bank and thence westward to the Gulf of St. Lawrence, Scotian Shelf and Georges Bank, the higher numbers occurring at lower developmental temperatures and vice versa. The mean tooth-row counts showed a cline which was opposite to that for median dorsal thorns, increasing from the Baffin Island and Ungava Bay areas southward to the Scotian Shelf and Georges Bank. There was a slight tendency toward increased tooth-row numbers with fish length, but the within-area differences were not significant for lengths greater than 24 em which were used in the comparisons among areas. Males tended to have slightly more rows of teeth than females, but there was no clear evidence of sexual dimorphism. The number of tooth-rows in the lower jaw was, on the average, slightly higher than in the upper jaw, but the upper-jaw counts exceeded the lower-jaw counts in small samples from the geographical extremes of the populations studied. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Wilfred Templeman |
spellingShingle |
Wilfred Templeman Variations in numbers of median dorsal thorns and rows of teeth in thorny skate (Raja radiata) of the Northwest |
author_facet |
Wilfred Templeman |
author_sort |
Wilfred Templeman |
title |
Variations in numbers of median dorsal thorns and rows of teeth in thorny skate (Raja radiata) of the Northwest |
title_short |
Variations in numbers of median dorsal thorns and rows of teeth in thorny skate (Raja radiata) of the Northwest |
title_full |
Variations in numbers of median dorsal thorns and rows of teeth in thorny skate (Raja radiata) of the Northwest |
title_fullStr |
Variations in numbers of median dorsal thorns and rows of teeth in thorny skate (Raja radiata) of the Northwest |
title_full_unstemmed |
Variations in numbers of median dorsal thorns and rows of teeth in thorny skate (Raja radiata) of the Northwest |
title_sort |
variations in numbers of median dorsal thorns and rows of teeth in thorny skate (raja radiata) of the northwest |
publishDate |
1984 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.613.1561 http://journal.nafo.int/j05/templeman4.pdf |
long_lat |
ENVELOPE(-67.489,-67.489,59.498,59.498) |
geographic |
Baffin Island Newfoundland Ungava Bay |
geographic_facet |
Baffin Island Newfoundland Ungava Bay |
genre |
Baffin Island Baffin Newfoundland Northwest Atlantic Ungava Bay |
genre_facet |
Baffin Island Baffin Newfoundland Northwest Atlantic Ungava Bay |
op_source |
http://journal.nafo.int/j05/templeman4.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.613.1561 http://journal.nafo.int/j05/templeman4.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766365738745987072 |