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Dopamine mediates life-history responses to food abundance in Daphnia

Expression of adaptive reaction norms of life-history traits to spatio-temporal variation in food availability is crucial for individual fitness. Yet little is known about the neural signalling mechanisms underlying these reaction norms. Previous studies suggest a role for the dopamine system in reg...

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Autores principales: Issa, Semona, Gamelon, Marlène, Ciesielski, Tomasz Maciej, Vike-Jonas, Kristine, Asimakopoulos, Alexandros G., Jaspers, Veerle L. B., Einum, Sigurd
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7423461/
https://www.ncbi.nlm.nih.gov/pubmed/32605517
http://dx.doi.org/10.1098/rspb.2020.1069
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author Issa, Semona
Gamelon, Marlène
Ciesielski, Tomasz Maciej
Vike-Jonas, Kristine
Asimakopoulos, Alexandros G.
Jaspers, Veerle L. B.
Einum, Sigurd
author_facet Issa, Semona
Gamelon, Marlène
Ciesielski, Tomasz Maciej
Vike-Jonas, Kristine
Asimakopoulos, Alexandros G.
Jaspers, Veerle L. B.
Einum, Sigurd
author_sort Issa, Semona
collection PubMed
description Expression of adaptive reaction norms of life-history traits to spatio-temporal variation in food availability is crucial for individual fitness. Yet little is known about the neural signalling mechanisms underlying these reaction norms. Previous studies suggest a role for the dopamine system in regulating behavioural and morphological responses to food across a wide range of taxa. We tested whether this neural signalling system also regulates life-history reaction norms by exposing the zooplankton Daphnia magna to both dopamine and the dopamine reuptake inhibitor bupropion, an antidepressant that enters aquatic environments via various pathways. We recorded a range of life-history traits across two food levels. Both treatments induced changes to the life-history reaction norm slopes. These were due to the effects of the treatments being more pronounced at restricted food ration, where controls had lower somatic growth rates, higher age and larger size at maturation. This translated into a higher population growth rate (r) of dopamine and bupropion treatments when food was restricted. Our findings show that the dopamine system is an important regulatory mechanism underlying life-history trait responses to food abundance and that bupropion can strongly influence the life history of aquatic species such as D. magna. We discuss why D. magna do not evolve towards higher endogenous dopamine levels despite the apparent fitness benefits.
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spelling pubmed-74234612020-08-25 Dopamine mediates life-history responses to food abundance in Daphnia Issa, Semona Gamelon, Marlène Ciesielski, Tomasz Maciej Vike-Jonas, Kristine Asimakopoulos, Alexandros G. Jaspers, Veerle L. B. Einum, Sigurd Proc Biol Sci Ecology Expression of adaptive reaction norms of life-history traits to spatio-temporal variation in food availability is crucial for individual fitness. Yet little is known about the neural signalling mechanisms underlying these reaction norms. Previous studies suggest a role for the dopamine system in regulating behavioural and morphological responses to food across a wide range of taxa. We tested whether this neural signalling system also regulates life-history reaction norms by exposing the zooplankton Daphnia magna to both dopamine and the dopamine reuptake inhibitor bupropion, an antidepressant that enters aquatic environments via various pathways. We recorded a range of life-history traits across two food levels. Both treatments induced changes to the life-history reaction norm slopes. These were due to the effects of the treatments being more pronounced at restricted food ration, where controls had lower somatic growth rates, higher age and larger size at maturation. This translated into a higher population growth rate (r) of dopamine and bupropion treatments when food was restricted. Our findings show that the dopamine system is an important regulatory mechanism underlying life-history trait responses to food abundance and that bupropion can strongly influence the life history of aquatic species such as D. magna. We discuss why D. magna do not evolve towards higher endogenous dopamine levels despite the apparent fitness benefits. The Royal Society 2020-07-08 2020-07-01 /pmc/articles/PMC7423461/ /pubmed/32605517 http://dx.doi.org/10.1098/rspb.2020.1069 Text en © 2020 The Authors. http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Ecology
Issa, Semona
Gamelon, Marlène
Ciesielski, Tomasz Maciej
Vike-Jonas, Kristine
Asimakopoulos, Alexandros G.
Jaspers, Veerle L. B.
Einum, Sigurd
Dopamine mediates life-history responses to food abundance in Daphnia
title Dopamine mediates life-history responses to food abundance in Daphnia
title_full Dopamine mediates life-history responses to food abundance in Daphnia
title_fullStr Dopamine mediates life-history responses to food abundance in Daphnia
title_full_unstemmed Dopamine mediates life-history responses to food abundance in Daphnia
title_short Dopamine mediates life-history responses to food abundance in Daphnia
title_sort dopamine mediates life-history responses to food abundance in daphnia
topic Ecology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7423461/
https://www.ncbi.nlm.nih.gov/pubmed/32605517
http://dx.doi.org/10.1098/rspb.2020.1069
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