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Mechanisms in the Photoperiodic Control of Reproduction in the Stickleback.

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Title: Mechanisms in the Photoperiodic Control of Reproduction in the Stickleback.
Authors: Borg, Bertil, Bornestaf, Cecilia, Hellqvist, Anna, Schmitz, Monika, Mayer, Ian
Source: Behaviour. Nov2004, Vol. 141 Issue 11/12, p1521-1530. 10p.
Subjects: Sticklebacks, Photoperiodism, Stickleback behavior, Photoreceptors, Melatonin, Aromatase
Abstract: In sticklebacks, sexual maturation is stimulated by long photoperiods but not by short photoperiods, even at high temperatures. Extra-retinal photoreception can mediate this response, and appears to be more important than retinal photoreception. Although plasma melatonin levels are high at night and low during the day, experiments using melatonin administration via the water indicate that melatonin is of no or little importance for the photoperiodic response. Androgens can be aromatised to estrogens in the stickleback brain. Treatment with aromatase inhibitors stimulates maturation of males also under short photoperiod, suggesting that aromatase is involved in the suppressive actions of short photoperiod. Expression of both follicle stimulating hormone (FSH)-β and luteinizing hormone (LH)-β is higher under long than under short photoperiod. FSH-β is controlled by a negative steroid feedback on the brain-pituitary-gonad axis under short photoperiod and by a positive steroid feedback under long photoperiod. It is suggested that the former can suppress reproduction under short photoperiod and the latter can stimulate breeding under long photoperiod. [ABSTRACT FROM AUTHOR]
Copyright of Behaviour is the property of Brill Academic Publishers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Mechanisms in the Photoperiodic Control of Reproduction in the Stickleback.
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  Data: <searchLink fieldCode="AR" term="%22Borg%2C+Bertil%22">Borg, Bertil</searchLink><br /><searchLink fieldCode="AR" term="%22Bornestaf%2C+Cecilia%22">Bornestaf, Cecilia</searchLink><br /><searchLink fieldCode="AR" term="%22Hellqvist%2C+Anna%22">Hellqvist, Anna</searchLink><br /><searchLink fieldCode="AR" term="%22Schmitz%2C+Monika%22">Schmitz, Monika</searchLink><br /><searchLink fieldCode="AR" term="%22Mayer%2C+Ian%22">Mayer, Ian</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Behaviour%22">Behaviour</searchLink>. Nov2004, Vol. 141 Issue 11/12, p1521-1530. 10p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Sticklebacks%22">Sticklebacks</searchLink><br /><searchLink fieldCode="DE" term="%22Photoperiodism%22">Photoperiodism</searchLink><br /><searchLink fieldCode="DE" term="%22Stickleback+behavior%22">Stickleback behavior</searchLink><br /><searchLink fieldCode="DE" term="%22Photoreceptors%22">Photoreceptors</searchLink><br /><searchLink fieldCode="DE" term="%22Melatonin%22">Melatonin</searchLink><br /><searchLink fieldCode="DE" term="%22Aromatase%22">Aromatase</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In sticklebacks, sexual maturation is stimulated by long photoperiods but not by short photoperiods, even at high temperatures. Extra-retinal photoreception can mediate this response, and appears to be more important than retinal photoreception. Although plasma melatonin levels are high at night and low during the day, experiments using melatonin administration via the water indicate that melatonin is of no or little importance for the photoperiodic response. Androgens can be aromatised to estrogens in the stickleback brain. Treatment with aromatase inhibitors stimulates maturation of males also under short photoperiod, suggesting that aromatase is involved in the suppressive actions of short photoperiod. Expression of both follicle stimulating hormone (FSH)-β and luteinizing hormone (LH)-β is higher under long than under short photoperiod. FSH-β is controlled by a negative steroid feedback on the brain-pituitary-gonad axis under short photoperiod and by a positive steroid feedback under long photoperiod. It is suggested that the former can suppress reproduction under short photoperiod and the latter can stimulate breeding under long photoperiod. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Behaviour is the property of Brill Academic Publishers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1163/1568539042948213
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 1521
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      – SubjectFull: Sticklebacks
        Type: general
      – SubjectFull: Photoperiodism
        Type: general
      – SubjectFull: Stickleback behavior
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      – SubjectFull: Photoreceptors
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      – SubjectFull: Melatonin
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      – SubjectFull: Aromatase
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      – TitleFull: Mechanisms in the Photoperiodic Control of Reproduction in the Stickleback.
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            NameFull: Hellqvist, Anna
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            NameFull: Schmitz, Monika
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              M: 11
              Text: Nov2004
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              Y: 2004
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              Value: 141
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