Ranging Patterns of a Troop of Baboons &lt;i&gt;(Papio anubis&lt;/i&gt;&lt;i&gt;)&lt;/i&gt; in Kenya

Harding, Robert S. Ο.

doi:10.1159/000155711

Cited by 106 publications

(52 citation statements)

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“…Rainfall patterns varied from year to year, but the study site generally had a long rainy season (April through June), a short rainy season (around Novem ber) and 2 intervening dry seasons [18,19], Rainfall measurements were taken on a daily basis from a rain gauge located near the edge of the home range of Pumphouse troop. Annual variability in temperature was limited, but the winter and spring months tended to have higher maximum temperatures than the fall and summer months.…”

Section: Methodsmentioning

confidence: 99%

Annual Birth Patterns of Savanna Baboons (Papio cynocephalus anubis) over a Ten-Year Period at Gilgil, Kenya

Bercovitch

Harding²

1993

IJFP

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Most cercopithecines reproduce on a seasonal basis, but the proximate mechanisms influencing birth periodicity are often unclear. We analyze 10 years of data from the Gilgil Baboon Project (Kenya) in order to examine the relationship between annual birth patterns and rainfall. Savanna baboons at Gilgil copulated in all months of the year, and births did not occur on a seasonal basis. Annual rainfall patterns showed no association with annual birth patterns, but the chances of conception were significantly greater following the end of the long rainy season than at other times of the year. Nonseasonal reproduction is a general characteristic of savanna baboons (Pαpio cynocephalus subsp.) throughout Africa. The extreme dietary diversity of baboons enables them to utilize a wide variety of resources and facultatively manipulate the timing of different stages in the reproductive cycle in accordance with resource availability. We predict that nonseasonality of reproduction will be more likely to occur among species with a large dietary diversity than among species with a more restricted diet.

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Section: Methodsmentioning

confidence: 99%

Annual Birth Patterns of Savanna Baboons (Papio cynocephalus anubis) over a Ten-Year Period at Gilgil, Kenya

Bercovitch

Harding²

1993

IJFP

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“…Areas in which several (critical) resources co-occur tend to be favoured by baboons [Harding, 1976;Barton et al, 1992]. The 70% kernels encompass only 5-10% of each focal group's total home range.…”

Section: Ranging Time Budget and Dietmentioning

confidence: 99%

The Disregarded West: Diet and Behavioural Ecology of Olive Baboons in the Ivory Coast

Kunz

Linsenmair²

2007

IJFP

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Despite living under environmental conditions considerably distinct from those of savannah baboons (Papio spp.) in East and southern Africa, very little is known about western Papio populations. We monitored the abundance and group sizes of olive baboons (P. anubis) in the savannah-forest mosaic of the Comoé National Park, northern Ivory Coast, and observed 2 habituated groups of different sizes. Against expectations for the kind of habitat, the individual density was low, yielding only 1.2 baboons/km². The groups were small, comprising on average 15 individuals, and the proportion of 1-male groups (50–63%) was remarkably high. One-male groups were more female biased than multi-male groups. The baboons were highly frugivorous, spending about 50% of their feeding time on fruits and seeds of at least 79 woody plant species. The 2 habituated groups had comparatively large home ranges and used forests more often than expected by random. We argue that regular subgrouping of the larger focal group and different habitat quality countervailed inter-group variations. Differences from other study sites, however, are not completely explained by current models of baboon (socio)ecology. It appears that the social organization of olive baboons is more flexible than assumed from data on East African populations.

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“…Gilgil regularly experiences a long rainy season (April-June), a short rainy season (around November), and two intervening dry seasons (Harding, 1976 At least six troops of baboons occupied Kekopey Ranch and the adjacent area. These six troops were the subjects of a biobehavioral study conducted between September 1978and March 1979(Byles and Sanders, 1981Olivier et aI., 1986).…”

Section: The Study Sitementioning

confidence: 99%

Body Size, Sperm Competition, and Determinants of Reproductive Success in Male Savanna Baboons

Bercovitch

1989

Evolution

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Abstract. -One component of sexual selection is sperm competition. It has been reasoned that the intensity of sperm competition may be reflected in the relative testicular sizes of animals. Among males residing in multi male breeding systems, testicular size is relatively larger than among males residing in unimale mating systems. Information on whether differences in testicular size within a species can account for differences in male reproductive success is unavailable for natural populations of primates.A population ofsix troops ofsavanna baboons in Kenya was surveyed for morphometric analysis, and one of these troops was the subject of extensive behavioral observations afterwards. Testicular weights could not be obtained, but measurements of linear dimensions were transformed into volumetric estimates. Male weight accounted for 30% of the variance in testicular volume. Neither body size nor testicular volume was associated with differences in male reproductive activity. The outcome of fights over access to females could not be related to male body size, and ejaculatory patterns of males were independent of testicle size. Both sperm competition and aggressive competition intensified during the four-day optimum conception period, but fightsover access to consort females were infrequent.Among savanna baboons, the probability of an ejaculation resulting in a conception is fairly low, which may account for the infrequency of injurious fights. Although testicle size influences sperm production, it does not influence either the timing of mating or the fertilizing capacity of spermatozoa, and both of these factors probably account for a substantial fraction of the variance in male baboon paternity. Sperm competition is an adjunct to agonistic competition as a mechanism affecting male baboon reproductive success. It is concluded that male reproductive success in baboons is affected more by social factors than by morphological traits associated with size.

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Ranging Patterns of a Troop of Baboons <i>(Papio anubis</i><i>)</i> in Kenya

Cited by 106 publications

References 0 publications

Annual Birth Patterns of Savanna Baboons (Papio cynocephalus anubis) over a Ten-Year Period at Gilgil, Kenya

Annual Birth Patterns of Savanna Baboons (Papio cynocephalus anubis) over a Ten-Year Period at Gilgil, Kenya

The Disregarded West: Diet and Behavioural Ecology of Olive Baboons in the Ivory Coast

Body Size, Sperm Competition, and Determinants of Reproductive Success in Male Savanna Baboons

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