Category Archives: Horm Behav

Cortisol during adolescence organises personality traits and behavioural syndromes.

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Cortisol during adolescence organises personality traits and behavioural syndromes.

Horm Behav. 2018 Jun 25;:

Authors: Guenther A, Groothuis AGG, Krüger O, Goerlich-Jansson VC

Abstract
Despite the growing evidence for the importance of developmental experiences shaping consistent individual differences in behaviour and physiology, the role of endocrine factors underlying the development and maintenance of such differences across multiple traits, remains poorly understood. Here, we investigated how an experimental manipulation of circulating glucocorticoids during early adolescence affects behavioural and physiological variation and covariation later in life in the precocial cavy (Cavia aperea). Plasma cortisol concentrations were experimentally elevated by administering cortisol via food for 3 weeks. Struggle docility, escape latency, boldness, exploration and social behaviour were then tested three times after individuals attained sexual maturity. In addition, blood samples were taken repeatedly to monitor circulating cortisol concentrations. Exogenous cortisol affected mean trait expression of plasma cortisol levels, struggle docility and escape latency. Repeatability of cortisol and escape latency was increased and repeatability of struggle docility tended to be higher (approaching significance) in treated individuals. Increased repeatability was mainly caused by an increase of among-individual variance. Correlations among docility, escape latency and cortisol were stronger in treated animals compared to control animals. These results suggest that exposure to elevated levels of cortisol during adolescence can alter animal personality traits as well as behavioural syndromes. Social and risk-taking traits showed no correlation with cortisol levels and were unaffected by the experimental manipulation, indicating behavioural modularity. Taken together, our data highlight that cortisol can have organising effects during adolescence on the development of personality traits and behavioural syndromes, adding to the increasing evidence that not only early life but also adolescence is an important sensitive period for behavioural development.

PMID: 29953885 [PubMed – as supplied by publisher]

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Influence of mate preference and laying order on maternal allocation in a monogamous parrot species with extreme hatching asynchrony.

Influence of mate preference and laying order on maternal allocation in a monogamous parrot species with extreme hatching asynchrony.

Horm Behav. 2015 Apr 10;

Authors: Lahaye SE, Eens M, Iserbyt A, Groothuis TG, de Vries B, Müller W, Pinxten R

Abstract
It is well established that in many avian species, prenatal maternal resource allocation varies both between and within clutches and may affect offspring fitness. Differential allocation of maternal resources, in terms of egg weight and yolk composition, may therefore allow the female to adjust brood reduction and to fine-tune reproductive investment in accordance with the expected fitness returns. The adaptive value of such maternal resource allocation is thought to be context-dependent as well as species-specific. We investigated the effects of female preference for her mate on the allocation of prenatal maternal resources in the budgerigar, Melopsittacus undulatus, a monogamous species of parrot that shows an extreme hatching asynchrony. We assessed mate preferences in a two-way preference test and allowed females two breeding rounds: one with the preferred and one with the non-preferred partner. We found no effect of preference on either latency to lay or clutch size, but females mated with the preferred partner laid eggs that contained significantly more yolk. Their eggs also contained significantly more androstenedione but not testosterone. Our results suggest that in this species, female preference may influence maternal resource allocation, and that the functional roles of each androgen in the yolk should be considered separately. In addition, we found a significant effect of laying order on egg and yolk weight as well as on yolk testosterone and androstenedione levels. These measures, however, did not change linearly with the laying order and render it unlikely that female budgerigars compensate for the extreme hatching asynchrony by adjusting within-clutch allocation of prenatal maternal resources.

PMID: 25870020 [PubMed – as supplied by publisher]

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Effect of rapid modulation of circulating plasma testosterone concentration on begging, aggressive behavior and competition for food in black-headed gull (Larus ridibundus) chicks.

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Effect of rapid modulation of circulating plasma testosterone concentration on begging, aggressive behavior and competition for food in black-headed gull (Larus ridibundus) chicks.
Horm Behav. 2013 Aug;64(3):… Continue reading

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Chronic enhancement of brain oxytocin levels causes enduring anti-aggressive and pro-social explorative behavioral effects in male rats.

Chronic enhancement of brain oxytocin levels causes enduring anti-aggressive and pro-social explorative behavioral effects in male rats.
Horm Behav. 2014 Mar 26;
Authors: Calcagnoli F, Meyer N, de Boer SF, Althaus M, Koolhaas … Continue reading

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Forced and voluntary exercise counteract insulin resistance in rats: the role of coping style.

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Forced and voluntary exercise counteract insulin resistance in rats: the role of coping style.
Horm Behav. 2012 Jun;62(1):93-8
Authors: Boersma GJ, Barf RP, Benthem L, van Dijk G, Scheurink AJ
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The acute glucocorticoid stress response does not differentiate between rewarding and aversive social stimuli in rats.

The acute glucocorticoid stress response does not differentiate between rewarding and aversive social stimuli in rats.

Horm Behav. 2012 Feb;61(2):218-26

Authors: Buwalda B, Scholte…

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Divergent hormonal responses to social competition in closely related species of haplochromine cichlid fish.

Divergent hormonal responses to social competition in closely related species of haplochromine cichlid fish.

Horm Behav. 2012 Jan 24;

Authors: Dijkstra PD, Verzijden MN, Groothuis…

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Testosterone levels and their associations with lifetime number of opposite sex partners and remarriage in a large sample of American elderly men and women.

Testosterone levels and their associations with lifetime number of opposite sex partners and remarriage in a large sample of American elderly men and women.

Horm Behav. 2011 Jun;60(1):72-7

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Brain circuits for mating behavior in cats and brain activations and de-activations during sexual stimulation and ejaculation and orgasm in humans.

Brain circuits for mating behavior in cats and brain activations and de-activations during sexual stimulation and ejaculation and orgasm in humans.

Horm Behav. 2011 May;59(5):702-7

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