Stress, reproduction, and adrenocortical modulation in amphibians and reptiles

Moore, Ignacio T.; Jessop, Tim S.

doi:10.1016/s0018-506x(02)00038-7

Cited by 470 publications

(332 citation statements)

References 61 publications

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“…Negative relationships between T and B are present in many species because B can suppress sex steroid levels (Greenberg and Wingfield, 1987). However, positive correlations between T and B occur in species that experience high energetic demands during the breeding season, where high T levels promote reproductive behaviors and high B levels pro mote energy mobilization (Moore and Jessop, 2003). We found that there was no seasonal variation in B levels in male C. atrox during the active season, and B levels were not related to T levels.…”

Section: Discussionmentioning

confidence: 53%

“…While B is typically considered a ''stress hormone'' (Greenberg and Wingfield, 1987), its produc tion by the adrenal cortex can occur in response to many factors including reproduction (Romero, 2002). Increases in circulating B during the mating period and vitello genesis have been noted in many reptile species (reviewed in Moore and Jessop, 2003;Romero, 2002), and this in crease in B may involve its role in energy mobilization for vitellogenesis (Grassman and Crews, 1990;Wilson and Wingfield, 1992). However, other squamate species show peaks in B during the later stages of gestation (DauphinVillemant et al, 1990;Guillette et al, 1997).…”

Section: Discussionmentioning

confidence: 99%

“…Many species show correlations between T and B levels (Moore and Jessop, 2003). Negative relationships between T and B are present in many species because B can suppress sex steroid levels (Greenberg and Wingfield, 1987).…”

Section: Discussionmentioning

confidence: 99%

“…The adrenal glucocorticoids (e.g., Steroid hormones regulate many physiological procorticosterone, B) are elevated during reproduction in cesses in vertebrates, including reproduction, growth, some species, acting to mobilize energy for costly reand homeostatic mechanisms such as water and energy productive behaviors (Moore and Jessop, 2003). balance.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal steroid hormone levels and their relation to reproduction in the Western Diamond-backed Rattlesnake, Crotalus atrox (Serpentes: Viperidae)

Taylor

DeNardo

Jennings

2004

General and Comparative Endocrinology

101

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We report seasonal variation in steroid hormone levels in blood samples from free ranging Western Diamond backed Rattle snakes (Crotalus atrox), and the relationship between these hormones and events in the reproductive cycle. At a field site in the Sonoran Desert of south central Arizona, we collected monthly blood samples over the course of two active seasons from 17 ra diotelemetered females, and over three active seasons from 103 randomly encountered males. We used radioimmunoassay to measure plasma levels of 17b estradiol, progesterone, corticosterone, and testosterone in samples from females, and corticosterone and testosterone in samples from males. Non reproductive females have consistently low levels of circulating 17b estradiol, pro gesterone, and testosterone throughout the year. In reproductive females, 17b estradiol levels increase dramatically and testosterone levels increase modestly during vitellogenesis in April and May, while progesterone levels increase dramatically at ovulation in June and then steadily decline until parturition in August. Corticosterone levels appear relatively constant in non reproductive females, whereas reproductive females show increased levels at the end of gestation. Plasma testosterone levels in males are low in early summer and are elevated during spring and late summer, corresponding to the two mating periods of C. atrox. Plasma cortico sterone levels in males did not vary seasonally and were not related to testosterone levels.

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Section: Discussionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal steroid hormone levels and their relation to reproduction in the Western Diamond-backed Rattlesnake, Crotalus atrox (Serpentes: Viperidae)

Taylor

DeNardo

Jennings

2004

General and Comparative Endocrinology

101

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“…Although hormonal alterations accompany parasitic infection, the interpretation of stress response using CORT requires always a careful interpretation. In fact, CORT plasma levels vary not only in response to stressor‐dependent factors (duration and intensity), but they are also susceptible to individual‐dependent factors (e.g., reproductive status) which should be considered when GCs are used as physiologic indices of condition in wild populations (Breuner, Wingfield, & Romero, 1999; Moore & Jessop, 2003; Romero, 2002). …”

Section: Introductionmentioning

confidence: 99%

Effects of parasitic infection and reproduction on corticosterone plasma levels in Galápagos land iguanas, Conolophus marthae and C. subcristatus

Onorati

Sancesario²,

Pastore

et al. 2017

Ecology and Evolution

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In vertebrates, one main feature of stress response is the release of glucocorticoids (corticosterone in reptiles), steroid hormones whose synthesis is regulated by the hypothalamic–pituitary–adrenal axis (HPA). In the Galápagos Islands, populations of land iguanas are differentially impacted by a tick‐transmitted apicomplexan hemoparasite of genus Hepatozoon, which could cause diseases and ultimately reduce fitness. Using competitive enzyme‐linked immunosorbent assays (ELISA), we examined baseline plasma corticosterone levels of two syntopic and highly parasitized populations of the land iguana species Conolophus marthae and C. subcristatus in Wolf volcano (Isabela Island). We also used a poorly parasitized population of C. subcristatus from the same island (Bahia Urbina) as a reference. To better interpret the observed glucocorticoids patterns, we simultaneously performed the count of white blood cells (WBCs) in all individuals and investigated the reproductive status of females. We did not find evidence in support of either a positive or negative relationship between the tick load, hemoparasite infection, and glucocorticoid plasma concentration in C. marthae and C. subcristatus at Wolf volcano. The comparison between parasitized and non‐parasitized sites (V. Wolf and Bahia Urbina) would instead suggest an inverse relationship between corticosterone and parasites. Our findings support association between corticosterone plasma levels and reproduction.

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Developmental Plasticity of Individual Variation in Stress Responses

Wada

2014

Integrative Organismal Biology

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Stress, reproduction, and adrenocortical modulation in amphibians and reptiles

Cited by 470 publications

References 61 publications

Seasonal steroid hormone levels and their relation to reproduction in the Western Diamond-backed Rattlesnake, Crotalus atrox (Serpentes: Viperidae)

Seasonal steroid hormone levels and their relation to reproduction in the Western Diamond-backed Rattlesnake, Crotalus atrox (Serpentes: Viperidae)

Effects of parasitic infection and reproduction on corticosterone plasma levels in Galápagos land iguanas, Conolophus marthae and C. subcristatus

Developmental Plasticity of Individual Variation in Stress Responses

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