No gains for bigger brains: Functional and neuroanatomical consequences of relative brain size in a parasitic wasp.
Nasonia vitripennis
appetitive olfactory conditioning
bidirectional artificial selection
brain scaling
brain size
longevity
parasitic wasp
Journal
Journal of evolutionary biology
ISSN: 1420-9101
Titre abrégé: J Evol Biol
Pays: Switzerland
ID NLM: 8809954
Informations de publication
Date de publication:
07 2019
07 2019
Historique:
received:
08
07
2018
revised:
25
10
2018
accepted:
26
03
2019
pubmed:
1
4
2019
medline:
24
6
2020
entrez:
1
4
2019
Statut:
ppublish
Résumé
Heritable genetic variation in relative brain size can underlie the relationship between brain performance and the relative size of the brain. We used bidirectional artificial selection to study the consequences of genetic variation in relative brain size on brain morphology, cognition and longevity in Nasonia vitripennis parasitoid wasps. Our results show a robust change in relative brain size after 26 generations of selection and six generations of relaxation. Total average neuropil volume of the brain was 16% larger in wasps selected for relatively large brains than in wasps selected for relatively small brains, whereas the body length of the large-brained wasps was smaller. Furthermore, the relative volume of the antennal lobes was larger in wasps with relatively large brains. Relative brain size did not influence olfactory memory retention, whereas wasps that were selected for larger relative brain size had a shorter longevity, which was even further reduced after a learning experience. These effects of genetic variation on neuropil composition and memory retention are different from previously described effects of phenotypic plasticity in absolute brain size. In conclusion, having relatively large brains may be costly for N. vitripennis, whereas no cognitive benefits were recorded.
Identifiants
pubmed: 30929291
doi: 10.1111/jeb.13450
pmc: PMC6850633
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
694-705Informations de copyright
© 2019 The Authors. Journal of Evolutionary Biology published by John Wiley & Sons Ltd on behalf of European Society for Evolutionary Biology.
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