The role of social rank in the development, physiology and reproductive strategies in salmonids
Salmonids naturally organise into social hierarchies both in the wild and aquaculture. This thesis investigates how social rank influences the physiology and development of salmonids with different life strategies using Atlantic salmon (Salmo salar) as a model. In broad terms two types of studies we...
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University of Exeter
2009
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ftunivexeter:oai:ore.exeter.ac.uk:10036/104585 2023-05-15T15:32:57+02:00 The role of social rank in the development, physiology and reproductive strategies in salmonids Murua, Jefferson Wilson, Roderic William 2009 http://hdl.handle.net/10036/104585 en eng University of Exeter School of Biosciences BBS/S/L/2005/12124 http://hdl.handle.net/10036/104585 To allow publication Aalmonid Physiology Behaviour Serotonin Thesis or dissertation PhD in Biological Sciences Doctoral PhD 2009 ftunivexeter 2022-11-20T21:30:17Z Salmonids naturally organise into social hierarchies both in the wild and aquaculture. This thesis investigates how social rank influences the physiology and development of salmonids with different life strategies using Atlantic salmon (Salmo salar) as a model. In broad terms two types of studies were conducted. Firstly osmoregulatory traits of freshwater parr prior to smolting, maturing or remaining immature where investigated using Na+ gill uptake kinetics. Highly distinct patterns emerged, especially for Na+ uptake affinity, between future alternative phenotypes, which could potentially be used as an identification tool in otherwise visually identical fish. Examination of Na+ uptake kinetics from a social status perspective revealed that first and intermediate ranked fish, which received less aggression and had lower cortisol, were better prepared for sea water entry. In the second batch of studies brain serotonergic activity (5-HIAA/5-HT), a key regulator of agonistic behaviour in vertebrates, was examined in a range of social conditions. First, the stability of social ranks was tested by food manipulation. The most dominant fish were able to retain their high status even after being kept in nutrient poor conditions. High status was associated with a high standard metabolic rate (SMR) and low brain 5-HIAA/5-HT. Secondly, studies on hierarchies with marked bimodal size asymmetries showed that upper modal group fish (UMG) became dominant. Despite being subordinate lower modal group (LMG) individuals showed similar growth rates, serotonin turnover and cortisol to UMG fish, possibly due to high aggression and fin injury sustained by high rank fish fighting for dominance. Thirdly, the association between social dominance and developmental pathway was examined in size-matched groups of immature parr and precocious parr, with the latter obtaining higher social positions and showing higher aggression. Brain serotonin turnover revealed higher 5-HIAA/5-HT in immature parr, a phenotypic distinction that was also ... Doctoral or Postdoctoral Thesis Atlantic salmon Salmo salar University of Exeter: Open Research Exeter (ORE) |
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University of Exeter: Open Research Exeter (ORE) |
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ftunivexeter |
language |
English |
topic |
Aalmonid Physiology Behaviour Serotonin |
spellingShingle |
Aalmonid Physiology Behaviour Serotonin Murua, Jefferson The role of social rank in the development, physiology and reproductive strategies in salmonids |
topic_facet |
Aalmonid Physiology Behaviour Serotonin |
description |
Salmonids naturally organise into social hierarchies both in the wild and aquaculture. This thesis investigates how social rank influences the physiology and development of salmonids with different life strategies using Atlantic salmon (Salmo salar) as a model. In broad terms two types of studies were conducted. Firstly osmoregulatory traits of freshwater parr prior to smolting, maturing or remaining immature where investigated using Na+ gill uptake kinetics. Highly distinct patterns emerged, especially for Na+ uptake affinity, between future alternative phenotypes, which could potentially be used as an identification tool in otherwise visually identical fish. Examination of Na+ uptake kinetics from a social status perspective revealed that first and intermediate ranked fish, which received less aggression and had lower cortisol, were better prepared for sea water entry. In the second batch of studies brain serotonergic activity (5-HIAA/5-HT), a key regulator of agonistic behaviour in vertebrates, was examined in a range of social conditions. First, the stability of social ranks was tested by food manipulation. The most dominant fish were able to retain their high status even after being kept in nutrient poor conditions. High status was associated with a high standard metabolic rate (SMR) and low brain 5-HIAA/5-HT. Secondly, studies on hierarchies with marked bimodal size asymmetries showed that upper modal group fish (UMG) became dominant. Despite being subordinate lower modal group (LMG) individuals showed similar growth rates, serotonin turnover and cortisol to UMG fish, possibly due to high aggression and fin injury sustained by high rank fish fighting for dominance. Thirdly, the association between social dominance and developmental pathway was examined in size-matched groups of immature parr and precocious parr, with the latter obtaining higher social positions and showing higher aggression. Brain serotonin turnover revealed higher 5-HIAA/5-HT in immature parr, a phenotypic distinction that was also ... |
author2 |
Wilson, Roderic William |
format |
Doctoral or Postdoctoral Thesis |
author |
Murua, Jefferson |
author_facet |
Murua, Jefferson |
author_sort |
Murua, Jefferson |
title |
The role of social rank in the development, physiology and reproductive strategies in salmonids |
title_short |
The role of social rank in the development, physiology and reproductive strategies in salmonids |
title_full |
The role of social rank in the development, physiology and reproductive strategies in salmonids |
title_fullStr |
The role of social rank in the development, physiology and reproductive strategies in salmonids |
title_full_unstemmed |
The role of social rank in the development, physiology and reproductive strategies in salmonids |
title_sort |
role of social rank in the development, physiology and reproductive strategies in salmonids |
publisher |
University of Exeter |
publishDate |
2009 |
url |
http://hdl.handle.net/10036/104585 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
BBS/S/L/2005/12124 http://hdl.handle.net/10036/104585 |
op_rights |
To allow publication |
_version_ |
1766363424303874048 |