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6 results for “age at first reproduction”
Data from: Age at first reproduction and senescence in Eastern chipmunks (Tamia striatus)
<p class="MsoNormal"><span>Senescence is the degradation of biological functions with </span><span>increasing </span><span>age. Its existence and relationship with life-history strategies remains poorly studied in short-lived wild vertebrate species. We investigated the relationships between age at first reproduction (AFR), reproductive senescence and longevity in an eastern chipmunk (<em>Tamias striatus</em>) population, where the first opportunity to breed is conditioned by pulses of seed production by trees (i.e., masts). </span><span>We used 11 years of data from a longitudinal study, in which females breed for the first time at seven, 15, or 22 months of age and males at seven or 15 months of age. We first assessed the effect of age on three traits associated with breeding performance, namely the number of offspring produced, and the probability of weaning or siring a litter. We then tested whether an earlier AFR accelerated reproductive senescence and reduced survival of both males and females. </span><span>We found sex-specific relationships between AFR and senescence. Females reproducing at 15 or 22 months of age showed reproductive senescence, but early-breeding females did not show any decline in reproductive performance at an older age. Also, although we observed reproductive senescence in males, it was not affected by AFR. </span><span>Our results are consistent with studies highlighting the existence of reproductive senescence in small, wild mammals. Importantly, we provide the first evidence that AFR can strongly influence the patterns of senescence in small short-lived species and does it in a sex-specific way. Our results highlight the importance of studying life-history strategies in both males and females when studying senescence in the wild.</span></p>
Data from: Age at first reproduction and senescence in Eastern chipmunks (Tamia striatus)
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Data from: Determinants of age at first reproduction and lifetime breeding success revealed by full paternity assignment in a male ungulate
Age at first reproduction is an important determinant of individual variation in reproductive success in ungulates, but few studies have examined its relationship with later fitness-related traits in males. We used a long-term individual based study of a harvested moose population to quantify the individual reproductive performance and survival of males, as well as to examine the determinants of age at first reproduction and consequences of age at first reproduction on lifetime breeding success. The probability that a male successfully reproduced at the age of two was negatively related to the mean age of adult males in the population, but the relationship weakened with increasing population size. Large antlers and large body mass relative to other males in the population increased the number of calves sired at their first successful mating season. In addition, those that successfully reproduced as two year-olds were more likely to sire calves the next year, making them more productive at a given age compared to those that first reproduced at the age of three or older. We emphasize the importance for males to start reproducing as soon as possible in a harvested population to gain lifetime fitness benefits, as surviving the hunt is a major determinant of reproductive success in this population. We found no costs of early reproduction in males, hence leading to high individual heterogeneity in male reproductive performance. The apparent lack of reproductive costs could partly be explained by the age distribution in the population, individual variation in early-life body mass and antler size, and differences in probabilities of being killed during hunt between successful and unsuccessful males.
Age at first reproduction in wolves: different patterns of density dependence for females and males
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Data from: Determinants of age at first reproduction and lifetime breeding success revealed by full paternity assignment in a male ungulate
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High-arctic family planning: earlier spring onset advances age at first reproduction in barnacle geese
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