Secondary sex ratio of the cyclic parthenogen Daphnia magna (Crustacea: Cladocera) in the Canadian Arctic
Secondary sex ratios of the cyclic parthenogen Daphnia magna were studied in habitats near Churchill, Manitoba. Daphnia magna is believed to possess an environmentally mediated sex-determining system. Throughout the season females produced broods that were predominantly unisexual. The proportion of...
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Language: | English |
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Canadian Science Publishing
1986
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Online Access: | http://dx.doi.org/10.1139/z86-171 http://www.nrcresearchpress.com/doi/pdf/10.1139/z86-171 |
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crcansciencepubl:10.1139/z86-171 2024-04-07T07:50:17+00:00 Secondary sex ratio of the cyclic parthenogen Daphnia magna (Crustacea: Cladocera) in the Canadian Arctic Barker, David M. Hebert, Paul D. N. 1986 http://dx.doi.org/10.1139/z86-171 http://www.nrcresearchpress.com/doi/pdf/10.1139/z86-171 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 64, issue 5, page 1137-1143 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1986 crcansciencepubl https://doi.org/10.1139/z86-171 2024-03-08T00:37:42Z Secondary sex ratios of the cyclic parthenogen Daphnia magna were studied in habitats near Churchill, Manitoba. Daphnia magna is believed to possess an environmentally mediated sex-determining system. Throughout the season females produced broods that were predominantly unisexual. The proportion of male offspring was low early in the season but rose to a value near 50% in each of four populations. It is hypothesized that after they have an initial series of female broods, individual females begin to alternate the sexes of their broods in response to an environmental cue. Such an alternation of brood sexes would explain the population sex-ratio pattern observed and would satisfy theoretical requirements for population and individual secondary sex ratios of 1:1. In studies on cladocerans, environmental cues inducing the sex-ratio response must be distinguished from cues with a sex-determining effect. Article in Journal/Newspaper Arctic Churchill Canadian Science Publishing Arctic Canadian Journal of Zoology 64 5 1137 1143 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Barker, David M. Hebert, Paul D. N. Secondary sex ratio of the cyclic parthenogen Daphnia magna (Crustacea: Cladocera) in the Canadian Arctic |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Secondary sex ratios of the cyclic parthenogen Daphnia magna were studied in habitats near Churchill, Manitoba. Daphnia magna is believed to possess an environmentally mediated sex-determining system. Throughout the season females produced broods that were predominantly unisexual. The proportion of male offspring was low early in the season but rose to a value near 50% in each of four populations. It is hypothesized that after they have an initial series of female broods, individual females begin to alternate the sexes of their broods in response to an environmental cue. Such an alternation of brood sexes would explain the population sex-ratio pattern observed and would satisfy theoretical requirements for population and individual secondary sex ratios of 1:1. In studies on cladocerans, environmental cues inducing the sex-ratio response must be distinguished from cues with a sex-determining effect. |
format |
Article in Journal/Newspaper |
author |
Barker, David M. Hebert, Paul D. N. |
author_facet |
Barker, David M. Hebert, Paul D. N. |
author_sort |
Barker, David M. |
title |
Secondary sex ratio of the cyclic parthenogen Daphnia magna (Crustacea: Cladocera) in the Canadian Arctic |
title_short |
Secondary sex ratio of the cyclic parthenogen Daphnia magna (Crustacea: Cladocera) in the Canadian Arctic |
title_full |
Secondary sex ratio of the cyclic parthenogen Daphnia magna (Crustacea: Cladocera) in the Canadian Arctic |
title_fullStr |
Secondary sex ratio of the cyclic parthenogen Daphnia magna (Crustacea: Cladocera) in the Canadian Arctic |
title_full_unstemmed |
Secondary sex ratio of the cyclic parthenogen Daphnia magna (Crustacea: Cladocera) in the Canadian Arctic |
title_sort |
secondary sex ratio of the cyclic parthenogen daphnia magna (crustacea: cladocera) in the canadian arctic |
publisher |
Canadian Science Publishing |
publishDate |
1986 |
url |
http://dx.doi.org/10.1139/z86-171 http://www.nrcresearchpress.com/doi/pdf/10.1139/z86-171 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Churchill |
genre_facet |
Arctic Churchill |
op_source |
Canadian Journal of Zoology volume 64, issue 5, page 1137-1143 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z86-171 |
container_title |
Canadian Journal of Zoology |
container_volume |
64 |
container_issue |
5 |
container_start_page |
1137 |
op_container_end_page |
1143 |
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1795664966875873280 |