Selected aspects of collared peccary (<i>Dicotyles tajacu</i>) reproductive biology in a captive texas herd

Lochmiller, Robert L.; Hellgren, Eric C.; Grant, William E.

doi:10.1002/zoo.1430030206

Cited by 20 publications

(4 citation statements)

References 6 publications

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“…There is evidence that copulatory plugs are negatively associated with degree of sexual dimorphism and females' sexual receptivity length, indicating that passive mate guarding with copulatory plugs can be a successful alternative strategy to active guarding and agonistic competition (Dunham and Rudolf 2009). The sexual receptive period in female collared peccaries is short (from two to four days; Lochmiller et al 1984;Mauget et al 1997) suggesting that males could have evolved a response to female promiscuity.…”

Section: Parentage and Mating Systemmentioning

confidence: 99%

Is sexual monomorphism a predictor of polygynandry? Evidence from a social mammal, the collared peccary

Cooper

Waser

Hellgren

et al. 2010

Behav Ecol Sociobiol

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Sexual dimorphism is common in polygynous species, and there is clear evidence that both intra-sexual competition and female preferences can drive the evolution of large body size in males. In contrast, sexual monomorphism is often argued to reflect a relaxation of male mate competition or an intensification of resource competition among females. Alternatively, it might imply opportunities for females to circumvent or counteract male mate competition in a polygynandrous mating system. We test the prediction that sexual monorphism is associated with polygynandry in the collared peccary (Pecari tajacu, Tayassuidae), a social ungulate closely related to the old-world suids. The genetic mating system in the Tayassuidae is unknown, but its sexual monomorphism presents a striking contrast to the strong size dimorphism found in most Suidae, so that a departure from the polygynous system common in Suidae would be noteworthy. We characterized genetic relationships among adults within herds in three geographically distinct populations, assigned parents to 75 offspring, and tested for skew in individual reproductive success. Parentage assignment data indicated that multiple males sire offspring within a herd, and in the population for which genetic data were most complete, 19% of parentage assignments were potentially sired by extra-herd males. Some litters have multiple sires, and neither males nor females monopolized reproduction, even in small herds. This result supports our prediction and suggests that sexual monomorphism may either select for or be an evolutionary consequence of a promiscuous mating system.

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Section: Parentage and Mating Systemmentioning

confidence: 99%

Is sexual monomorphism a predictor of polygynandry? Evidence from a social mammal, the collared peccary

Cooper

Waser

Hellgren

et al. 2010

Behav Ecol Sociobiol

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“…Reproductive biology of the male collared peccary remains largely unexplored, although female reproduction has been studied in detail (Wislocki, 1931;Sowls, 1966;Low, 1970;Smith & Sowls, 1975;Lochmiller, 1984;Lochmiller et al, 1984b;Hellgren et al, 1985). Field studies have shown strong relationships between vegetative quantity and quality, rainfall, and peccary herd recruitment (number of young surviving to breed¬ ing age) (Low, 1970;Bissonette, 1982).…”

Section: Introductionmentioning

confidence: 96%

Seasonal variation in serum testosterone, testicular measurements and semen characteristics in the collared peccary (Tayassu tajacu)

Hellgren

Lochmiller²,

Amoss³

et al. 1989

Reproduction

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Blood samples and testicular measurements were obtained from 4-8 captive adult collared peccaries monthly for 18 months and from wild adult males during summer (N = 16) and winter (N = 22) seasons. Serum concentrations of testosterone were determined by radioimmunoassay. Semen samples were collected monthly by electroejaculation from captive males for 1 year. Serum testosterone concentrations and testicular measurements varied in a low-amplitude circannual pattern, with maximum mean testosterone concentrations in fall and winter (1150-1400 pg/ml) and minimum values in summer (500-700 pg/ml). Circannual rhythms appeared to be related to dominance. Serum testosterone levels in wild males generally were lower than in captive males, although this difference was not significant (P greater than 0.05). Semen characteristics did not exhibit a circannual rhythm. These results suggest that the male peccary remains reproductively fertile throughout the year, yet may undergo a facultative summer quiescence influenced by ambient temperature and social factors.

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“…This contrasts with the collared peccary (Tayassu tajacu) which appears to have more females than males [Sowls, 1966;Low, 1970;Smith and Sowls, 1975]. However, Lochmiller et al [1984] reported a higher ratio of males to females (56:44), based on 57 young from a captive herd in Texas.…”

Section: Discussionmentioning

confidence: 98%

Age specific fecundity, litter size, and sex ratio in the chacoan peccary (Catagonus wagneri)

Yahnke

Unger²,

Lohr

et al. 1997

Zoo Biol.

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Selected aspects of collared peccary (Dicotyles tajacu) reproductive biology in a captive texas herd

Cited by 20 publications

References 6 publications

Is sexual monomorphism a predictor of polygynandry? Evidence from a social mammal, the collared peccary

Is sexual monomorphism a predictor of polygynandry? Evidence from a social mammal, the collared peccary

Seasonal variation in serum testosterone, testicular measurements and semen characteristics in the collared peccary (Tayassu tajacu)

Age specific fecundity, litter size, and sex ratio in the chacoan peccary (Catagonus wagneri)

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