Summary: American Journal of Primatology 70:114­118 (2008)
RESEARCH ARTICLE
Demography, Life History and Migrations in a Mexican Mantled Howler Group in
a Rainforest Fragment
VI´CTOR ARROYO-RODRI´GUEZ1Ã, NORBERTO ASENSIO2
, AND JURGI CRISTO´BAL-AZKARATE3
1
Divisio´n de Posgrado, Instituto de Ecologi´a A. C., Xalapa, Veracruz, Mexico
2
Research Centre in Evolutionary Anthropology and Palaeoecology, School of Biological and Earth Sciences, Liverpool John
Moores University, Liverpool, United Kingdom
3
Centre Especial de Recerca en Primats, Universitat de Barcelona, Gran Via de les Corts Catalanes, Barcelona
This paper represents the results of a long-term study (1996­2003) on the demographic changes over time
of a Mexican mantled howler (Alouatta palliata mexicana) group in a rainforest fragment (40 ha) in Los
Tuxtlas, Mexico, with a follow-up census 3 years later (2006). In addition to demographic and life history
parameters, we describe six dispersal events. Our results suggest that this group has been expanding
during the study period, growing from six to 12 individuals, with an annual average intrinsic growth rate
of 0.07, an infant survivorship of 67%, and an average immature to female ratio of 0.90. This increase in
size is probably related to the high food availability in their home range. However, fragment isolation may

Source: Arroyo Rodríguez, Víctor - Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México

Collections: Biology and Medicine; Environmental Sciences and Ecology