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Infant hybrids in a newly formed mixed-species group of howler monkeys (Alouatta guariba clamitans and Alouatta caraya) in northeastern Argentina
(Springer Tokyo, 2008-12)
Natural hybridisation between species has been reported in several primate taxa. In the Neotropics, there is increasing evidence of this phenomenon in howler monkeys (genus Alouatta) in contact zones between species. We ...
Ranging patterns of two syntopic howler monkey species (Alouatta guariba and A. caraya) in Northeastern Argentina
(Springer/Plenum Publishers, 2010-06)
To avoid competition, ecologically similar and closely related species tend to differ in their patterns of habitat use when they live in sympatry. We compared ranging patterns of brown howler (Alouatta guariba) and black ...
Are howler monkey species ecologically equivalent? trophic niche overlap in syntopic alouatta guariba clamitans and Alouatta caraya
(Wiley-liss, Div John Wiley & Sons Inc, 2010-02)
According to the principle of competitive exclusion, niche differentiation allows the stable coexistence of closely related species. We analyzed dietary profile and diversity, and dietary overlap between syntopic brown ...
Determinants of daily path length in black and gold howler monkeys (Alouatta caraya) in northeastern Argentina
(Wiley-liss, Div John Wiley & Sons Inc, 2016-08)
Models used to explain the social organization of primates suggest that variation in daily path length (DPL) is a response to variation in resource distribution and the intensity of intragroup feeding competition. However, ...
Life-history traits and group dynamic in black and gold howler monkeys in flooded forests of northern Argentina
(Cambridge University Press, 2019)
Black and gold howlers (Alouatta caraya) reach the southernmost distribution of all howler species in Northern Argentina, where they are found living on islands with flooded forest along the Parana River and in gallery ...
Births in Wild Black and Gold Howler Monkeys (Alouatta caraya) in Northern Argentina
(Wiley-liss, Inc, 2009-03)
Previous studies on births in nonhuman primates suggest that births are expected to occur at night to avoid predators. Here, we describe birth-related behaviors in wild black and gold howler monkeys, Alouatta caraya and ...
Impact of yellow fever outbreaks on two howler monkey species (Alouatta guariba clamitans and A. caraya) in Misiones, Argentina
(Wiley, 2010-06)
Two yellow fever outbreaks (YFOs) ocurred in northeastern Argentina between November 2007 and October 2008, seriously affecting populations of two howler monkey species: the brown howler Alouatta guariba clamitans and the ...
Influence of seasonality, group size, and presence of a congener on activity patterns of howler monkeys
(Oxford University Press, 2012-06)
Ecologically similar and closely related species in sympatry may differ in their activity patterns to avoid interspecific contest competition. We here present the 1st study aimed at evaluating the effects of seasonality, ...
Tracking the Ovarian Cycle in Black-and-Gold Howlers (Alouatta caraya) by Measuring Fecal Steroids and Observing Vaginal Bleeding
(SPRINGER, 2011)
A better understanding of a species` reproductive physiology can help conservation programs to manage primates in the wild and develop assisted reproductive technologies in captivity. We investigated whether measurements ...
Collective Action and Male Affiliation in Howler Monkeys (Alouatta caraya)
(Springer, 2011)
Traditional models of primate socioecology highlight female within-group feeding competition and aggression over limited food resources as a primary driver of primate social interactions. In this regard several authors ...