Neuroendocrinology of agonostic interaction and social signalling in Artic charr (Salvelinus alpinus) : Studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour
This thesis shows that socially subordinate Arctic charr (Salvelinus alpinus) display elevated brain serotonergic (5-HT) and norepinephric activity along with a chronic activation of the hypothalamic-pituitary-interrenal (HPI) axis, including elevated plasma concentrations of á-MSH. Furthermore, sub...
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Uppsala universitet, Institutionen för evolutionsbiologi
2001
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ftuppsalauniv:oai:DiVA.org:uu-616 2023-05-15T14:30:06+02:00 Neuroendocrinology of agonostic interaction and social signalling in Artic charr (Salvelinus alpinus) : Studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour Höglund, Erik 2001 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-616 eng eng Uppsala universitet, Institutionen för evolutionsbiologi Uppsala : Acta Universitatis Upsaliensis Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1104-232X 611 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-616 urn:isbn:91-554-4964-6 info:eu-repo/semantics/openAccess Developmental biology Brain monoamines social signalling POMC skin colour stress Salmonid Utvecklingsbiologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2001 ftuppsalauniv 2023-02-23T21:44:33Z This thesis shows that socially subordinate Arctic charr (Salvelinus alpinus) display elevated brain serotonergic (5-HT) and norepinephric activity along with a chronic activation of the hypothalamic-pituitary-interrenal (HPI) axis, including elevated plasma concentrations of á-MSH. Furthermore, subordinate fish showed an inhibition of aggressive behaviour and darker body coloration, skin darkness being positively correlated with plasma á-MSH. Fish kept on dark background, and thus being darker in body colour, were less aggressive than conspecifics interacting on white background, supporting the hypothesis that skin darkening could signal social submission. The 5-HT1A -receptor agonist 8-OH-DPAT stimulated HPI axis activity in non-stressed fish, but if administrated to stressed fish it inhibited HPI axis activity, suggesting that 5-HT1A receptors may act as both post- and pre-synaptic receptors. 8-OH-DPAT also induced skin darkening in both non-stressed and stressed fish. Stimulation of brain dopaminergic activity by L-dopa treatment counteracted the stress-induced inhibition of aggressive behaviour, and stress related effects on brain 5-HT activity and plasma levels of cortisol. In conclusion, social subordination in Arctic charr results in skin darkening and an inhibition of aggressive behaviour. Stress-induced effects, that could be mediated by elevated brain 5-HT activity, and serve as a way of signalling social position and coping with stress. Doctoral or Postdoctoral Thesis Arctic charr Arctic Salvelinus alpinus Uppsala University: Publications (DiVA) Arctic |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Developmental biology Brain monoamines social signalling POMC skin colour stress Salmonid Utvecklingsbiologi |
spellingShingle |
Developmental biology Brain monoamines social signalling POMC skin colour stress Salmonid Utvecklingsbiologi Höglund, Erik Neuroendocrinology of agonostic interaction and social signalling in Artic charr (Salvelinus alpinus) : Studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour |
topic_facet |
Developmental biology Brain monoamines social signalling POMC skin colour stress Salmonid Utvecklingsbiologi |
description |
This thesis shows that socially subordinate Arctic charr (Salvelinus alpinus) display elevated brain serotonergic (5-HT) and norepinephric activity along with a chronic activation of the hypothalamic-pituitary-interrenal (HPI) axis, including elevated plasma concentrations of á-MSH. Furthermore, subordinate fish showed an inhibition of aggressive behaviour and darker body coloration, skin darkness being positively correlated with plasma á-MSH. Fish kept on dark background, and thus being darker in body colour, were less aggressive than conspecifics interacting on white background, supporting the hypothesis that skin darkening could signal social submission. The 5-HT1A -receptor agonist 8-OH-DPAT stimulated HPI axis activity in non-stressed fish, but if administrated to stressed fish it inhibited HPI axis activity, suggesting that 5-HT1A receptors may act as both post- and pre-synaptic receptors. 8-OH-DPAT also induced skin darkening in both non-stressed and stressed fish. Stimulation of brain dopaminergic activity by L-dopa treatment counteracted the stress-induced inhibition of aggressive behaviour, and stress related effects on brain 5-HT activity and plasma levels of cortisol. In conclusion, social subordination in Arctic charr results in skin darkening and an inhibition of aggressive behaviour. Stress-induced effects, that could be mediated by elevated brain 5-HT activity, and serve as a way of signalling social position and coping with stress. |
format |
Doctoral or Postdoctoral Thesis |
author |
Höglund, Erik |
author_facet |
Höglund, Erik |
author_sort |
Höglund, Erik |
title |
Neuroendocrinology of agonostic interaction and social signalling in Artic charr (Salvelinus alpinus) : Studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour |
title_short |
Neuroendocrinology of agonostic interaction and social signalling in Artic charr (Salvelinus alpinus) : Studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour |
title_full |
Neuroendocrinology of agonostic interaction and social signalling in Artic charr (Salvelinus alpinus) : Studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour |
title_fullStr |
Neuroendocrinology of agonostic interaction and social signalling in Artic charr (Salvelinus alpinus) : Studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour |
title_full_unstemmed |
Neuroendocrinology of agonostic interaction and social signalling in Artic charr (Salvelinus alpinus) : Studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour |
title_sort |
neuroendocrinology of agonostic interaction and social signalling in artic charr (salvelinus alpinus) : studies on the neuroendocrine regulation of aggressive behaviour, stress responses and skin colour |
publisher |
Uppsala universitet, Institutionen för evolutionsbiologi |
publishDate |
2001 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-616 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Salvelinus alpinus |
genre_facet |
Arctic charr Arctic Salvelinus alpinus |
op_relation |
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1104-232X 611 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-616 urn:isbn:91-554-4964-6 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766304023329112064 |