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Titolo:
Reproductive consequences of variation in the composition of howler monkey(Alouatta spp.) groups
Autore:
Treves, A;
Indirizzi:
Conservat Int, Ctr Appl Biodivers Sci, Washington, DC USA Conservat Int Washington DC USA r Appl Biodivers Sci, Washington, DC USA Univ Wisconsin, Dept Psychol, Madison, WI 53706 USA Univ Wisconsin Madison WI USA 53706 , Dept Psychol, Madison, WI 53706 USA
Titolo Testata:
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
fascicolo: 1, volume: 50, anno: 2001,
pagine: 61 - 71
SICI:
0340-5443(200106)50:1<61:RCOVIT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
MANTLED HOWLING MONKEYS; PRIMATE SOCIAL-SYSTEMS; OPTIMAL GROUP-SIZE; POPULATION-DENSITY; COSTA-RICA; PREDATION AVOIDANCE; PRESBYTIS-ENTELLUS; NORTHERN ARGENTINA; CONSPECIFIC THREAT; NONHUMAN-PRIMATES;
Keywords:
howler monkeys; sex ratio; males; group composition; conspecific threat; reproductive performance;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
112
Recensione:
Indirizzi per estratti:
Indirizzo: Treves, A 6010 S Hill Dr, Madison, WI 53705 USA 6010 S Hill Dr Madison WIUSA 53705 l Dr, Madison, WI 53705 USA
Citazione:
A. Treves, "Reproductive consequences of variation in the composition of howler monkey(Alouatta spp.) groups", BEHAV ECO S, 50(1), 2001, pp. 61-71

Abstract

At least three general categories of environmental pressure - predation, resource distribution, and demographics - shape the costs and benefits of group-living fur animals. Among the demographic factors that influence individual survival and reproduction, the composition of social groups can play an important role. Census data drawn from 26 populations of howler monkeys (Alouatta spp.) were used to determine if the composition of groups explained variation in their reproductive performance. Each group's reproductive performance was estimated by calculating the difference between the observed number of immatures and the number expected from its population average. Offour group structure variables tested, only one - the residual of the adult and subadult sex ratio - was a consistent correlate of reproductive performance across the howler monkey populations. Groups with a greater proportion of adult and subadult males contained more juveniles than expected from the population average. I propose that the survival or retention of immatures within howler monkey groups depends in part on the behavior of resident males. Of particular importance, the relative proportions of resident malesand females were more informative than the absolute number of males or females. On this: basis, I evaluate the possible role of males in protection from predation, conspecific aggression, and resource competition. The techniques used ht re can also be used to forecast major changes in demographic structure within populations.

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Documento generato il 27/01/20 alle ore 01:26:13