Relationship between inbreeding and sex‐hormone concentration in rats under stress. II. The influence of various inbreeding levels on steroid‐sex‐hormone concentrations in two types of stress

Kosowska, Barbara; Zdrojewicz, Zygmunt

doi:10.1111/j.1439-0388.1996.tb00598.x

Cited by 7 publications

(6 citation statements)

References 22 publications

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“…(1999) suggested that the stronger effects of inbreeding in females may be related to different developmental strategies between sexes: young males grow more muscles, whereas females accumulate more fat. Sex hormones are also associated with the level of inbreeding (Kosowska & Zdrojewicz, 1996); when homozygosity increases, sex hormone levels decrease. Consequently, outbred males could have more androgens and higher muscle growth, possibly reducing survival overwinter.…”

Section: Discussionmentioning

confidence: 99%

Sex-differential effects of inbreeding on overwinter survival, birth date and mass of bighorn lambs

Rioux-Paquette

Festa-Bianchet

Coltman

2010

Journal of Evolutionary Biology

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Although it is generally expected that inbreeding would lower fitness, few studies have directly quantified the effects of inbreeding in wild mammals. We investigated the effects of inbreeding using long‐term data from bighorn sheep on Ram Mountain, Alberta, Canada, over 20 years. This population underwent a drastic decline from 1992 to 2002 and has since failed to recover. We used a pedigree to calculate inbreeding coefficients and examined their impact on lamb growth, birth date and survival. Inbreeding had a substantial effect on female survival: for a given mass in September, the probability of overwinter survival for inbred female lambs was about 40% lower than that of noninbred ones. Contrary to our expectations, inbred female lambs were born earlier than noninbred ones. Earlier birth led to inbred female lambs being heavier by mid‐September than noninbred ones. There was a nonsignificant trend for inbred female yearlings to weigh more than noninbred ones. A stronger mass‐dependent viability selection for inbred compared to noninbred female lambs may explain why surviving inbred females were heavier than noninbred ones. Survival of male lambs was not affected by inbreeding. Sex‐differential effects of inbreeding may be a general pattern in sexually dimorphic mammals, because of sex‐biased maternal care or sexual differences in early development strategies.

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Section: Discussionmentioning

confidence: 99%

Sex-differential effects of inbreeding on overwinter survival, birth date and mass of bighorn lambs

Rioux-Paquette

Festa-Bianchet

Coltman

2010

Journal of Evolutionary Biology

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“…Muscle growth in mammals is associated with blood levels of sex hormones (FIorini 1985(FIorini , 1987Arnold et al 1996Arnold et al , 1997. In rats, the level of these sex hormones is significantly associated with the level of inbreeding (Kosowska and Zdrojewicz 1996). Hormone levels decline as homozygosity increases.…”

Section: Discussionmentioning

confidence: 99%

Microsatellite Loci Reveal Sex-Dependent Responses to Inbreeding and Outbreeding in Red Deer Calves

Coulson¹,

Albon²,

Slate³

et al. 1999

Evolution

100

150

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Mean d is a recently devised microsatellite-based measure that is hypothesised to allow the detection of inbreeding depression and heterosis in free-living populations. Two studies that have investigated the measure have both demonstrated an association between mean d and traits related to fitness. Here we present an association between mean d and an important component of fitness, first-year overwinter survival, in a population of red deer on the Isle of Rum, Scotland. The association between survival and mean d differed between males and females. As predicted, outbred female calves (high mean d ) survived better than those that were inbred (low mean d ). However, the association was in the opposite direction in male calves. We suggest that this difference is due to different early growth strategies between the sexes. The association between mean d and survival was not significantly influenced by any single locus. Decomposition of mean d into a recent inbreeding component and an outbreeding component showed that it was the degree of outbreeding that influenced survival in males and both the degree of outbreeding and recent inbreeding that influenced survival in females. Our analyses suggest that mean d is an easy-to-calculate measure of inbreeding and degree of outbreeding that can reveal interesting interactions between genetics and ecology.

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“…In rats, the level of these sex hormones is significantly associated with the level of inbreeding (Kosowska and Zdrojewicz 1996). Hormone levels decline as homozygosity increases.…”

Section: Discussionmentioning

confidence: 99%

Microsatellite Loci Reveal Sex-Dependent Responses to Inbreeding and Outbreeding in Red Deer Calves

Albon²,

et al. 1999

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Abstract.-Mean tF is a recently devised microsatellite-based measure that is hypothesised to allow the detection of inbreeding depression and heterosis in free-living populations. Two studies that have investigated the measure have both demonstratedan associationbetween mean tF and traits related to fitness. Here we present an association between mean tF and an important component of fitness, first-year overwinter survival, in a population of red deer on the Isle of Rum, Scotland. The association between survival and mean tF differed between males and females. As predicted, outbred female calves (high mean tF) survived better than those that were inbred (low mean tF). However, the association was in the opposite direction in male calves. We suggest that this difference is due to different early growth strategies between the sexes.The association between mean tF and survival was not significantly influencedby any single locus. Decomposition of mean tF into a recent inbreeding component and an outbreeding component showed that it was the degree of outbreeding that influenced survival in males and both the degree of outbreeding and recent inbreeding that influenced survival in females. Our analyses suggest that mean tF is an easy-to-calculate measure of inbreeding and degree of outbreeding that can reveal interesting interactions between genetics and ecology.

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Relationship between inbreeding and sex‐hormone concentration in rats under stress. II. The influence of various inbreeding levels on steroid‐sex‐hormone concentrations in two types of stress

Abstract: HSEUH, A. J. W., 1982: Mechanism of glucocorticoid-induced suppression of testicular androgen biosynthesis zn wztro.

Cited by 7 publications

References 22 publications

Sex-differential effects of inbreeding on overwinter survival, birth date and mass of bighorn lambs

Sex-differential effects of inbreeding on overwinter survival, birth date and mass of bighorn lambs

Microsatellite Loci Reveal Sex-Dependent Responses to Inbreeding and Outbreeding in Red Deer Calves

Microsatellite Loci Reveal Sex-Dependent Responses to Inbreeding and Outbreeding in Red Deer Calves

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