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Feeding motivation as a personality trait in Nile tilapia (Oreochromis niloticus): role of serotonergic neurotransmission

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Authors:
  • Silva, P.I.M. ;
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    Universidade do Algarve
  • Martins, C.I.M. ;
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    Universidade do Algarve
  • Höglund, Erik ;
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    National Institute of Aquatic Resources, Technical University of Denmark
  • Gjøen, H. M. ;
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    Norwegian University of Life Sciences
  • Øverli, Ø.
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    Norwegian University of Life Sciences
DOI:
10.1007/s10695-014-9947-2
Abstract:
Consistent individual variation in behaviour and physiology (i.e. animal personality or coping style) has emerged as a central topic in many biological disciplines. Yet, underlying mechanisms of crucial personality traits like feeding behaviour in novel environments remain unclear. Comparative studies, however, reveal a strong degree of evolutionary conservation of neural mechanisms controlling such behaviours throughout the vertebrate lineage. Previous studies have indicated duration of stress-induced anorexia as a consistent individual characteristic in teleost fishes. This study aims to determine to what degree brain 5-hydroxytryptamine (5-HT, serotonin) activity pertains to this aspect of animal personality, as a correlate to feed anticipatory behaviour and recovery of feed intake after transfer to a novel environment. Crucial to the definition of animal personality, a strong degree of individual consistency in different measures of feeding behaviour (feeding latency and feeding score), was demonstrated. Furthermore, low serotonergic activity in the hypothalamus was highly correlated with a personality characterized by high feeding motivation, with feeding motivation represented as an overall measure incorporating several behavioural parameters in a Principle Component Analyses (PCA). This study thus confirms individual variation in brain 5-HT neurotransmission as a correlate to complex behavioural syndromes related to feeding motivation
Type:
Journal article
Language:
English
Published in:
Fish Physiology and Biochemistry, 2014, Vol 40, Issue 5, p. 1547-1557
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
270502273

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