Rank dependent seasonal levels of IGF-1, cortisol and reproductive hormones in male pudu (Pudu puda)

Bartoš, Luděk; Reyes, Eugenia; Schams, D.; Bubenik, George A.; Lobos, Alejandro

doi:10.1016/s1095-6433(98)10038-7

Cited by 29 publications

(14 citation statements)

References 23 publications

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“…Nevertheless, most studies report seasonal differences in stress-induced glucocorticoid concentrations, but, as with baseline concentrations, some species, including male yellow-pine chipmunks (54), show a seasonal nadir during breeding (3,29,31,38,41,48), some, including golden-mantled ground squirrels (12), show a seasonal peak during breeding (1,11,30,48), and some, including female yellow-pine chipmunks (37), show no seasonal differences (2,10,28,69). In addition, most (7,16,52), but not all (49), captive studies with nontraditional laboratory animals show seasonal glucocorticoid variation.…”

Section: Discussionmentioning

confidence: 99%

Seasonal glucocorticoid responses to capture in wild free-living mammals

Romero¹,

Meister²,

Cyr³

et al. 2008

American Journal of Physiology-Regulatory, Integrative and Comp

106

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We determined baseline and capture-induced glucocorticoid concentrations during two different seasons in three species of wild free-living rodents: brown lemmings (Lemmus trimucronatus), golden-mantled ground squirrels (Spermophilus saturatus), and yellow-pine chipmunks (Tamias amoenus). Initial blood samples were obtained within 3 min of capture, so that initial glucocorticoid levels reflect baseline titers of undisturbed animals. Animals were held for an additional 30 min, when a second blood sample was taken to measure stress-induced glucocorticoid titers. The primary glucocorticoid differed in each species. Lemmings secreted extremely large amounts of corticosterone (as high as 8,000 ng/ml). These high concentrations were accompanied by high corticosterone-binding globulin capacity and resistance to negative feedback. Squirrels and chipmunks secreted a mixture of cortisol and corticosterone (10-400 ng/ml). In males of all three species and female squirrels and chipmunks, glucocorticoid levels were significantly elevated 30 min after capture. Baseline and 30-min glucocorticoid levels differed seasonally in each species. Levels were higher during summer (with no snow cover) than in spring (with approximately 60% snow cover) in female lemmings, higher during breeding than before hibernation in squirrels, and higher postreproductively than during breeding in chipmunks. Together, these data indicate that glucocorticoid responses to stress in these free-living species are similar to those in laboratory species, but the magnitude of the response appears to depend on life-history features specific to each species.

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Section: Discussionmentioning

confidence: 99%

Seasonal glucocorticoid responses to capture in wild free-living mammals

Romero¹,

Meister²,

Cyr³

et al. 2008

American Journal of Physiology-Regulatory, Integrative and Comp

106

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“…Most ungulates, such as red deer (Cervus elaphus), white-tailed deer (Odocoileus virginianus), pudu (Pudu puda), antelope and domestic horse, breed by establishing a hierarchical system (Clutton-Brock et al 1982;Gosling 1986;Ethology 110, 681-691 (2004) Ó 2004 Blackwell Verlag, Berlin ISSN 0179-1613 Miller et al 1987;McDonnell & Murray 1995;Barto et al 1998). Darwin (1871) pointed out that male competition for access to a limited number of females often results in high levels of male-male aggression.…”

Section: Introductionmentioning

confidence: 99%

“…Darwin (1871) pointed out that male competition for access to a limited number of females often results in high levels of male-male aggression. In cervids, many social behaviors that are associated with reproduction are regulated by gonadal steroid hormones (Miller et al 1987;Nelson et al 1990; Barto et al 1998). However, data on relationships between social behaviors, social rank, and endocrine factors in Pe`re David's deer (Elaphurus davidianus) are limited.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Serum Testosterone, Dominance and Mating Success in Père David's Deer Stags

Jiang

Zeng

et al. 2004

Ethology

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We conducted an experiment in the Beijing Milu Park to study the social behavior of male Pe`re David's deer, and related social behavior to social position and serum testosterone level of the stags during rut. We classified the stags into three rank classes according to their rutting behavior: Ôharem masterÕ, ÔchallengerÕ and ÔbachelorÕ. We monitored the behaviors of four Ôharem mastersÕ, five ÔchallengersÕ and five ÔbachelorsÕ, and analyzed serum testosterone levels in blood samples of those 14 stags using radioimmunoassay. We defined the effectiveness value, E ¼ A/T, to assess the effectiveness of herding or mating attempts made by stags (ÔTÕ represents the frequency of herding or mating attempts made by a stag and ÔAÕ represents the frequency of herding or mating attempts accepted by hinds). We found that: (1) the Ôharem mastersÕ and the ÔchallengersÕ displayed more frequent rut and locomotive behaviors but fewer ingestion behaviors than the ÔbachelorsÕ; (2) serum testosterone levels in the Ôharem mastersÕ and the ÔchallengersÕ were higher than that in the ÔbachelorsÕ;(3) effectiveness value of herding attempts differed significantly between the three types of stags, being highest in the Ôharem mastersÕ and the lowest in the ÔbachelorsÕ; and (4) effectiveness value of mating attempts was significantly greater for the Ôharem mastersÕ than for the ÔchallengersÕ. We conclude that: (1) reproductive behavior of the Pe`re David's deer stags is strongly associated with social rank; (2) social roles of Pe`re David's deer stags during the rut are related to the testosterone secretion; and (3) rank class affects the mating opportunity of the stags.

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“…In Astatotilapia burtoni-a cichlid fish in which transitions between territorial and nonterritorial status frequently occur-faster growth by nonterritorial males and males that recently gained a territory likely reflects an increase in IGF-1 production via stimulation of growth hormone secretion, because nonterritorial and recently ascended males produce less somatostatin relative to territorial males (Hofmann et al 1999;Hofmann and Fernald 2000;Trainor and Hofmann 2007). Indeed, production of IGF-1 differs with social rank in several species, with dominant wild baboons (Papio anubis; Sapolsky and Spencer 1997) and dominant pudu deer (Pudu puda; Bartoš et al 1998) displaying higher circulating levels of IGF-1 compared to subordinates. As well, higher hepatic transcript abundance of ig f-1 was associated with higher growth rates in dominant Nile tilapia (Oreochromis niloticus; Vera Cruz and Brown 2007).…”

Section: Introductionmentioning

confidence: 99%

Physiological Regulation of Growth during Social Ascension in a Group-Living Fish

Culbert

Balshine

Gilmour

2019

Physiological and Biochemical Zoology

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In social groups, dominant animals typically are larger and have better access to resources than subordinates. When subordinates are given the opportunity to ascend to a dominant position, they will elevate their rates of growth to help secure dominance. This study investigated the physiological mechanisms facilitating this increased growth. Using the group-living cichlid, Neolamprologus pulcher, we investigated whether the insulin-like growth factor (IGF) system-a key regulator of growth-is involved in the regulation of growth during social ascension. We also assessed differences in energy storage and expenditure among dominant, subordinate, and ascending males to determine the energetic costs associated with ascension. Daily growth rates tripled during ascension, and ascending males expended more energy after ascension, owing to higher rates of energetically costly social behaviors, increased locomotor activity, and larger home ranges. Ascenders did not increase food intake to offset increasing energetic costs but had half the liver glycogen energy stores of subordinates. Together, these results indicate a reliance on stockpiled energy reserves to fuel the high energetic demands associated with ascension. Transcript abundance of IGF binding proteins 1 (igfbp1) and 2a (igf bp2a) were low in ascenders relative to subordinates, suggesting a higher capacity for growth during ascension through increased bioavailability of circulating IGF-1. Our findings provide clear evidence of the energetic costs of social ascension and offer novel insight into the physiological mechanisms modulating the social regulation of growth.

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Rank dependent seasonal levels of IGF-1, cortisol and reproductive hormones in male pudu (Pudu puda)

Cited by 29 publications

References 23 publications

Seasonal glucocorticoid responses to capture in wild free-living mammals

Seasonal glucocorticoid responses to capture in wild free-living mammals

Relationship between Serum Testosterone, Dominance and Mating Success in Père David's Deer Stags

Physiological Regulation of Growth during Social Ascension in a Group-Living Fish

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