Stress and parental care: Prolactin responses to acute stress throughout the breeding cycle in a long-lived bird

Riou, Samuel; Chastel, Olivier; Lacroix, André; Hamer, Keith C.

doi:10.1016/j.ygcen.2010.03.011

Cited by 31 publications

(20 citation statements)

References 51 publications

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“…The differences may also reflect sex differences in hormonal regulation of parental effort versus self-maintenance independently of body condition, such as the differences between males and females in terms of prolactin levels (e.g. Riou et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Do leucocyte profiles reflect temporal and sexual variation in body condition over the breeding cycle in Southern Rockhopper Penguins?

et al. 2011

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Section: Discussionmentioning

confidence: 99%

Do leucocyte profiles reflect temporal and sexual variation in body condition over the breeding cycle in Southern Rockhopper Penguins?

et al. 2011

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“…2A, Etches et al, 1979;Sharp et al, 1979;Lea et al, 1981;Goldsmith and Williams, 1980;Goldsmith, 1982;Hall and Goldsmith, 1983) whereas they remain elevated during the chickrearing period in altricial species ( Fig. 2A, Dawson and Goldsmith, 1982;Hector and Goldsmith, 1985;Hall, 1986;Seiler et al, 1992;Lormée et al, 1999Lormée et al, , 2000Vleck et al, 2000;Riou et al, 2010;Angelier Fig. 1.…”

Section: Prolactin Secretion and Reproductive Modesmentioning

confidence: 95%

Does prolactin mediate parental and life-history decisions in response to environmental conditions in birds? A review

Angelier

Wingfield

Tartu

et al. 2016

Hormones and Behavior

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This article is part of a Special Issue "Parental Care". In vertebrates, adjustments of physiology and behavior to environmental changes are often mediated by central physiological mechanisms, and more specifically by hormonal mechanisms. As a consequence, these mechanisms are thought to orchestrate life-history decisions in wild vertebrates. For instance, investigating the hormonal regulation of parental behavior is relevant to evaluate how parents modulate their effort according to specific environmental conditions. Surprisingly and despite being classically known as the 'parental hormone', prolactin has been overlooked in birds relative to this context. Our aim is to review evidence that changes in prolactin levels can mediate, at least to some extent, the response of breeding birds to environmental conditions. To do so, we first examine current evidence and limits for the role of prolactin in mediating parental behavior in birds. Second, we emphasize the influence of environmental conditions and stressors on circulating prolactin levels. In addition, we review to what extent prolactin levels are a reliable predictor of breeding success in wild birds. By linking environmental conditions, prolactin regulation, parental behavior, and breeding success, we highlight the potential role of this hormone in mediating parental decisions in birds. Finally, we also review the potential role of prolactin in mediating other life history decisions such as clutch size, re-nesting, and the timing of molt. By evaluating the influence of stressors on circulating prolactin levels during these other life-history decisions, we also raise new hypotheses regarding the potential of the prolactin stress response to regulate the orchestration of the annual cycle when environmental changes occur. To sum up, we show in this review that prolactin regulation has a strong potential to allow ecological physiologists to better understand how individuals adjust their life-history decisions (clutch size, parental behavior, re-nesting, and onset of molt) according to the environmental conditions they encounter and we encourage further research on that topic.

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“…To mention a few examples, the diet composition of non-reproducing Wilson's storm petrels (Oceanites oceanicus) significantly differed from that of reproducing individuals (Quillfeldt, 2002). Glucocorticoid concentration was found to be lower (Riou et al, 2010;Selva et al, 2011;Novikov et al, 2015) or higher (Fischer et al, 1995) in reproducing than in non-reproducing individuals. Factors like diet and glucocorticoids have been shown to influence the regulation of the oxidative balance.…”

Section: A Commentary Onmentioning

confidence: 96%

Commentary: Oxidative stress as a cost of reproduction: beyond the simplistic trade-off model

Costantini

2016

Front. Ecol. Evol.

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A commentary onOxidative stress as a cost of reproduction: beyond the simplistic trade-off model by Speakman, J. R., and Garratt, M. (2014). Bioessays 36, 93-106. doi: 10.1002/bies.201300108 Current theory proposes that life history traits cannot be simultaneously maximized because there are costs paid in the currency of fitness when a change in one trait, for example increased reproduction, results in a detrimental change in another, for example decreased survival. The underlying reasoning is that resources (e.g., nutrients, energy, time) are finite and this gives rise to trade-offs in their allocation among traits, activities, or processes that compete for the same resource. Therefore, allocation of a resource to one trait means that less can be invested to other traits. This simple concept, referred to as a trade-off, has had a prominent role in our understanding of how life history variation arises.We currently know very little about how these costs of reproduction are actually incurred, since the majority of studies have focussed on the outcomes rather than the mechanisms. In the last decade, there has been substantial interest in the role of oxidative stress as a mechanism underlying the cost of reproduction and other life-history trade-offs. Oxidative stress is a complex multifaceted biochemical condition of the organism that occurs when generation of oxidative molecular damage increases (Costantini, 2008(Costantini, , 2014Metcalfe and Alonso-Alvarez, 2010;Isaksson et al., 2011). Several recent studies have, however, found weak or no support that reproductive effort increases oxidative damage (Costantini, 2014). In a recent article, Metcalfe and Monaghan (2013) have pointed out that several of these studies testing the role of oxidative stress as a cost of reproduction did not include data on non-breeding controls, making it hard to exclude seasonal or ontogenetic causes of changes in oxidative stress. They also highlighted, however, that females may tailor their own level of reproduction to avoid oxidative damage, hence it would be also important to manipulate the reproductive effort. In another article, Speakman and Garratt (2014) reinforced the idea of testing the oxidative cost of reproduction by randomly assigning animals to two groups, one of which is forced to reproduce and another one that is prevented from doing so. This is because even if individuals can choose their level of reproduction, what they cannot avoid, is an increase in metabolic rate, relative to a non-reproductive control animal. Recent experimental meta-analytic (Blount et al., 2015) work has, however, found that oxidative damage is lower in reproducing than in non-reproducing individuals, providing again little support for the oxidative cost of reproduction hypothesis.An important question then is whether non-reproducing individuals are truly appropriate controls. The answer does not seem to be so straightforward. Non-reproducing individuals may differ from reproducing individuals in several characteristics, which might make ...

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Stress and parental care: Prolactin responses to acute stress throughout the breeding cycle in a long-lived bird

Cited by 31 publications

References 51 publications

Do leucocyte profiles reflect temporal and sexual variation in body condition over the breeding cycle in Southern Rockhopper Penguins?

Do leucocyte profiles reflect temporal and sexual variation in body condition over the breeding cycle in Southern Rockhopper Penguins?

Does prolactin mediate parental and life-history decisions in response to environmental conditions in birds? A review

Commentary: Oxidative stress as a cost of reproduction: beyond the simplistic trade-off model

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