Birth Intervals inM. sylvanus of Gibraltar

Burton, Frances D.; Sawchuk, Lawrence A.

doi:10.1007/bf02381446

Cited by 14 publications

(12 citation statements)

References 8 publications

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“…In fact, the above authors reported that females which lost their own infants within 6 months of life, and hence were not lactating during the mating season, had shortened interbirth intervals (1 year). Data from other species of macaques are also consistent with the hypothesis that the pres ence of an infant affects the female's repro ductive cyclicity [Koford, 1965;Vandenbergh and Vessey, 1968;Drickamer, 1974;Angst, 1978;Hadidian and Bernstein, 1979; but see Burton and Sawchuk, 1982], Thus, in Macaca spp., evidence exists in support of a view that lactation is a mechanism that plays a central role in controlling reproduction [Short, 1976], The present study shows that the inter birth intervals experienced by the Rome group of Japanese macaques were shortened (1 year) and were not consistently affected by stillbirth and infant loss within 6 months of life. These results suggest that lactation was ineffective in restraining fertility in the study group.…”

Section: Discussionsupporting

confidence: 68%

Interbirth Intervals in a Captive Group of Japanese Macaques

Scucchi¹

1984

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Section: Discussionsupporting

confidence: 68%

Interbirth Intervals in a Captive Group of Japanese Macaques

Scucchi¹

1984

IJFP

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“…139], Especially in primiparous and old multiparous females birth intervals are pro longed. These results correspond to findings for M. sylvanus in Gibraltar [Burton and Sawchuk, 1982], Macaca mulatto [Missakian-Quinn andVarley, 1977, cited in Mit chell, 1979], Macaca arctoides [Silk et al, 1981], Macacafascicularis [Thommen, in preparation] and M.fuscata [Hiraiwa, 1981], A strategy of prolonged 'maternal invest ment' in the last-born infant is also practised by mothers who lost their previous infant, or who did not bear an infant in the preceding year. Here, too, a prolongation of the birth interval could be discerned [Thommen, in preparation].…”

Section: Discussionsupporting

confidence: 65%

“…A time span of 1 year between births can be considered as the norm [Burton and Sawchuk, 1982], In contrast to findings from other species [Tanaka et al, 1970;Asanov, 1972;Nomura et al, 1972;Angst and Thornmen, 1977;Angst, 1978;Hadidian and Bern stein, 1979] infant loss does not shorten the birth interval [Burton and Sawchuk, 1982], Concerning this matter Altmann et al [1978] state that 'Infant loss will have a greater impact on shortening interbirth-intervals in species with year-round breeding than in those with discrete breeding seasons' (p. 1029). In seasonally breeding species, how ever, with a normal birth interval of 2 years, infant loss considerably affects the length of the birth interval [Macaca fuscata : Tanaka et al, 1970;Nomura et al, 1972].…”

Section: Discussionmentioning

confidence: 99%

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Timing of Birth, Female Reproductive Success and Infant Sex Ratio in Semifree-Ranging Barbary Macaques (Macaca sylvanus)

Paul¹,

Thommen²

1984

IJFP

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Examined were 5 years of data on the reproduction of a semifree-ranging population of Barbary macaques (Macaca sylvanus). In this seasonally breeding species – birth season: mid-March to beginning of August – primiparous 4-year-old females gave birth significantly later in the year than older primiparous and multiparous females, respectively. Multiparous females without an infant from the preceding season gave birth significantly earlier than females who had raised an infant. 88.4% of birth intervals were approximately 1 year, 11.6% about 2 years. Infant loss did not influence the length of the interbirth interval, but after the birth of the next surviving infant the interval was significantly longer. The interval following the 1st infant was significantly longer than after subsequent infants. After the birth of daughters primiparous females had markedly longer birth intervals than after the birth of sons. Infant mortality was 9.1%. Neonatal mortality was influenced by rank and parity of the mother and sex of the infant. Allomothering and aggression by older group members are thought to be the main causes of infant mortality. Female reproduction rates were not dependent on rank. High-ranking females, however, bore their 1st infant significantly earlier than low-ranking females. Low-ranking females had more daughters than sons, in high-ranking females the reverse was found. Differences from findings of other species are discussed with regard to differences in social organization and the reproductive strategies resulting from them.

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“…Toutefois, cette reprise pré coce des cycles, observée notamment en Akfadou en 1983, n'induit pas une réduction de l'intervalle entre les naissances, phénomène confirmé sur des populations semi-libres [Burton et Sawchuk, 1982;Paul et Thommen, 1984], Par contre, Paul et Thommen montrent que la non-fécondité d'une femelle induit une fertilisation et une parturition plus précoce l'année suivante [cf. aussi Koford, 1965;Drickamer, 1974, sur M. mulatto]-, on peut alors s'attendre à ce que les femelles de la troupe du Tigounatine mettent bas plus tôt en 1985.…”

Section: Discussion Et Comparaisonunclassified

Démographie et reproduction de Macaca sylvanus dans différents habitats en Algérie

Ménard¹,

Vallet²,

Gautier‐Hion³

1985

IJFP

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Usually described as a cedar forest monkey, the Barbary macaque in effect has colonized a great variety of habitat types. At the moment, it is not known to what extent these different habitats are suitable for the species’ survival. We tried to answer this question by comparing the demography of three monkey troops: one lives in a deciduous oak forest; the second lives in an nondeciduous cedar-green oak forest while the third is found on rocky ridges of mountains without any arborescent vegetation. In the three sites, there is a true seasonal breeding season with most births taking place in April to May and most matings occurring in November to December. Details are given on reproduction parameters (sexual activity of females; fertility rates; young survival...). Monkeys densities are higher in cedar forest than in deciduous forest. The smallest density is found on mountain ridges. Forest troops are more numerous, highly stable; their growth rate is better and the population is relatively young. The situation is slightly better still in the cedar forest than in the oak forest with a sex ratio more in favor of females and a better survival of the young. The troop of the mountain ridges is an unstable group ranging from 10 to 25 individuals; the population is aging, with a low birth rate and more male infants surviving compared with females. Demographic differences between sites are discussed according to climate, food availability and human influences (tree-clearing and overgrazing). Conclusions are drawn from this situation, for species conservation.

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Birth Intervals inM. sylvanus of Gibraltar

Cited by 14 publications

References 8 publications

Interbirth Intervals in a Captive Group of Japanese Macaques

Interbirth Intervals in a Captive Group of Japanese Macaques

Timing of Birth, Female Reproductive Success and Infant Sex Ratio in Semifree-Ranging Barbary Macaques (Macaca sylvanus)

Démographie et reproduction de Macaca sylvanus dans différents habitats en Algérie

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