Reproduction in the cold: Thorson revisited
Although a tendency for high latitude marine invertebrates to avoid pelagic larval stages was first described in the 19th century, the most detailed early study was that of Thorson in Greenland. This work also established other features of the reproduction of polar marine invertebrates that have bec...
Published in: | Invertebrate Reproduction & Development |
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Taylor and Francis
1992
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Online Access: | http://nora.nerc.ac.uk/id/eprint/518371/ https://doi.org/10.1080/07924259.1992.9672270 |
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ftnerc:oai:nora.nerc.ac.uk:518371 2023-05-15T16:29:12+02:00 Reproduction in the cold: Thorson revisited Clarke, Andrew 1992 http://nora.nerc.ac.uk/id/eprint/518371/ https://doi.org/10.1080/07924259.1992.9672270 unknown Taylor and Francis Clarke, Andrew orcid:0000-0002-7582-3074 . 1992 Reproduction in the cold: Thorson revisited. Invertebrate Reproduction & Development, 22 (1-3). 175-183. https://doi.org/10.1080/07924259.1992.9672270 <https://doi.org/10.1080/07924259.1992.9672270> Publication - Article PeerReviewed 1992 ftnerc https://doi.org/10.1080/07924259.1992.9672270 2023-02-04T19:45:38Z Although a tendency for high latitude marine invertebrates to avoid pelagic larval stages was first described in the 19th century, the most detailed early study was that of Thorson in Greenland. This work also established other features of the reproduction of polar marine invertebrates that have become regarded as almost axiomatic (e.g., the release of larvae to coincide with the summer bloom) or largely ignored (a latitudinal cline in egg size within species). This short and selective review examines Thorson's conclusions in the light of recent work. It is now clear that although polar prosobranch gastropods reproduce almost entirely by direct development, for many taxa the real distinction between polar and non-polar species is in the proportion of feeding to non-feeding larvae. Some species release feeding larvae in winter and the energy source for these larvae is obscure. Growth is slow and there is little or no evidence for temperature compensation. Many crustacean species have larger eggs at higher latitudes. Egg size varies significantly within species, with larger eggs being associated with larger females and often reduced fecundity. The reasons for these within-species patterns are currently unresolved. Article in Journal/Newspaper Greenland Natural Environment Research Council: NERC Open Research Archive Greenland Invertebrate Reproduction & Development 22 1-3 175 183 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
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Although a tendency for high latitude marine invertebrates to avoid pelagic larval stages was first described in the 19th century, the most detailed early study was that of Thorson in Greenland. This work also established other features of the reproduction of polar marine invertebrates that have become regarded as almost axiomatic (e.g., the release of larvae to coincide with the summer bloom) or largely ignored (a latitudinal cline in egg size within species). This short and selective review examines Thorson's conclusions in the light of recent work. It is now clear that although polar prosobranch gastropods reproduce almost entirely by direct development, for many taxa the real distinction between polar and non-polar species is in the proportion of feeding to non-feeding larvae. Some species release feeding larvae in winter and the energy source for these larvae is obscure. Growth is slow and there is little or no evidence for temperature compensation. Many crustacean species have larger eggs at higher latitudes. Egg size varies significantly within species, with larger eggs being associated with larger females and often reduced fecundity. The reasons for these within-species patterns are currently unresolved. |
format |
Article in Journal/Newspaper |
author |
Clarke, Andrew |
spellingShingle |
Clarke, Andrew Reproduction in the cold: Thorson revisited |
author_facet |
Clarke, Andrew |
author_sort |
Clarke, Andrew |
title |
Reproduction in the cold: Thorson revisited |
title_short |
Reproduction in the cold: Thorson revisited |
title_full |
Reproduction in the cold: Thorson revisited |
title_fullStr |
Reproduction in the cold: Thorson revisited |
title_full_unstemmed |
Reproduction in the cold: Thorson revisited |
title_sort |
reproduction in the cold: thorson revisited |
publisher |
Taylor and Francis |
publishDate |
1992 |
url |
http://nora.nerc.ac.uk/id/eprint/518371/ https://doi.org/10.1080/07924259.1992.9672270 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
Clarke, Andrew orcid:0000-0002-7582-3074 . 1992 Reproduction in the cold: Thorson revisited. Invertebrate Reproduction & Development, 22 (1-3). 175-183. https://doi.org/10.1080/07924259.1992.9672270 <https://doi.org/10.1080/07924259.1992.9672270> |
op_doi |
https://doi.org/10.1080/07924259.1992.9672270 |
container_title |
Invertebrate Reproduction & Development |
container_volume |
22 |
container_issue |
1-3 |
container_start_page |
175 |
op_container_end_page |
183 |
_version_ |
1766018892034998272 |