Results 121 to 130 of about 383 (150)

Geographical distribution of the black howler (Alouatta pigra) in Central America

Primates, 1986
The geographic range of the black howler,Alouatta pigra in Mexico, Guatemala, and Belize was investigated by travelling through and visiting 65 locations within or close to the expected range. The existence of the species was noted through first hand observations or was documented by talking with residents and knowledgeable people in the area ...
Robert H. Horwich, Edwin D. Johnson
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Roaring rhythms in black howler monkeys (Alouatta pigra) of Belize

Primates, 1983
Roaring was recorded during 15-min intervals for 55 days from April 29 to July 14, 1981 in the area around Bermuda Landing, Belize. Roaring profiles were compiled to represent four three-week periods in which roaring was graphed against the time of day. Rates of roaring were also calculated for three troops.
Robert H. Horwich, Kris Gebhard
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FIELD TECHNIQUES FOR VASECTOMY IN BLACK HOWLER MONKEYS (ALOUATTA PIGRA)

Journal of Zoo and Wildlife Medicine
Three adult black howler monkeys (Alouatta pigra) were vasectomized for the purpose of population control. Two different surgical approaches (inguinal and pelvic) were used to vasectomize the animals under general anesthesia. One monkey was vasectomized with a pelvic approach, and the other two monkeys were vasectomized with an inguinal approach.
Samantha C, Rummel, Andrew C, Cushing, Christopher K, Smith, Pablo Jarrín, Yépez, Deborah, Haines   +4 more
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Demographic Features of Alouatta pigra Populations in Extensive and Fragmented Forests

2006
Until now, little information was known about demographic features of the regionally endemic black howler populations living in large tracks of tropical forests. Here, we report results from population surveys conducted in eight extensive forests sites (>8.5 km2) in Mexico and Guatemala.
Sarie Van Belle, Alejandro Estrada
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Movement and resource use by a group of Alouatta pigra in a forest fragment in Balancán, México

Primates, 2006
Uncommonly observed behaviors were systematically recorded in a troop (n = 9 individuals) of black howler monkeys (Alouatta pigra) inhabiting a small forest fragment (1.7 ha) in Leona Vicario, Balancán, Tabasco, Mexico. Between February 2002 and January 2003 (n = 499 h), we observed behaviors such as ground travel (85 occasions, total = 269 min/10.8 ...
Gilberto, Pozo-Montuy, Juan Carlos, Serio-Silva   +1 more
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Maternal Watchfulness in Black Howler Monkeys (Alouatta pigra)

Ethology, 2003
AbstractIn many vertebrates, parents protect their young by detecting predators and aggressive conspecifics before they attack. But parental investment in protection is a limited resource, whose allocation to offspring should reflect optimization strategies.
Adrian Treves, Ann Drescher, Charles T. Snowdon   +2 more
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Factors Influencing the Reproductive Success of Female Black Howlers (Alouatta pigra)

International Journal of Primatology, 2016
Measuring reproductive success is necessary to determine an organism's fitness, and thus, to address evolutionary processes. In this study we determined the effects of social, ecological, and individual attributes on the reproductive success of black howlers (Alouatta pigra) measured through infant survival and interbirth intervals (IBIs). From 2006 to
Pedro Américo D. Dias, Alejandro Coyohua-Fuentes, Domingo Canales-Espinosa, Ariadna Rangel-Negrín   +3 more
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Species status of the black howler monkey,Alouatta pigra, of Belize

Primates, 1983
Small troop sizes which averaged 5.23 members per troop and the early descent of male testes inAlouatta pigra show a marked difference fromA. palliata. These differences strengthenSmith's (1970) observations of morphological differences betweenA. pigra andA. palliata.
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Spatial and Diurnal Distribution of Loud Calling in Black Howlers (Alouatta pigra)

International Journal of Primatology, 2013
Loud calling, i.e., howling, is the single most distinctive behavioral attribute of the social system of howler monkeys (Alouatta spp.), yet no general consensus has been established regarding its function. During a 16-mo study, we investigated the degree to which howling bouts varied in duration and spatial and temporal patterns across different ...
Sarie Van Belle, Alejandro Estrada, Paul A. Garber   +2 more
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Breeding behaviors in the black howler monkey (Alouatta pigra) of belize

Primates, 1983
Adulterous breeding between a female howling monkey (Alouatta pigra) of one troop with a male of an adjacent troop occurred despite territorial defense between the two troops. The specific behaviors are described as well as a synopsis of daily events which occurred between the female and two males from adjacent troops.
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