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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, ...
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 ...
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 ...
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 ...
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 ...
Evaluation of sperm quality in successive regular collections from captive black-and-gold howler monkeys (Alouatta caraya)
(Brazilian Coll Animal Reproduction, 2014-01-01)
The black-and-gold howler monkey serves as a suitable model for development of assisted reproductive techniques (ARTs), which may later be applied in threatened species of the same genus. The objectives of this study were ...
Evaluation of sperm quality in successive regular collections from captive black-and-gold howler monkeys (Alouatta caraya)
(2014-01-01)
The black-and-gold howler monkey serves as a suitable model for development of assisted reproductive techniques (ARTs), which may later be applied in threatened species of the same genus. The objectives of this study were ...
Reduced geographic variation in roars in different habitats rejects the acoustic adaptation hypothesis in the black-and-gold howler monkey (Alouatta caraya)
(Wiley Blackwell Publishing, Inc, 2019-10)
Vocalizations used for long‐range communication must disperse without significant structural changes to be decoded by receivers. The acoustic adaptation hypothesis (AAH) holds that, since acoustic signals are influenced ...
Preliminary study of mother–offspring conflict in black and gold howler monkeys (Alouatta caraya)
(Springer Tokyo, 2010-07)
Parent–offspring conflict has been scarcely studied in Neotropical primates. In this study, we explored mother–offspring conflict in a group of wild black and gold howler monkeys (Alouatta caraya) in northeastern Argentina. ...
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, ...