Chromosome studies in the red howler monkey, Alouatta seniculus stramineus(Platyrrhini, Primates): description of an X1X2Y1Y2/X1X1X2X2sex-chromosome system and karyological comparisons with other subspecies

1991 ◽  
Vol 57 (2-3) ◽  
pp. 151-156 ◽  
Author(s):  
M.M.C. Lima ◽  
H.N. Seuánez
Keyword(s):  
Sex Chromosome ◽  
Howler Monkey ◽  
Alouatta Seniculus ◽  
Sex Chromosome System ◽  
Red Howler

Food selection by a hyperdense population of red howler monkeys (Alouatta seniculus)

2005 ◽  
Vol 21 (4) ◽  
pp. 445-450 ◽  
Author(s):  
Gabriela Orihuela Lopez ◽  
John Terborgh ◽  
Natalia Ceballos
Keyword(s):  
Tree Species ◽  
Howler Monkey ◽  
Small Island ◽  
Feeding Time ◽  
Normal Density ◽  
Alouatta Seniculus ◽  
Diet Choice ◽  
Generalist Herbivore ◽  
Large Island ◽  
Red Howler

We studied diet choice by a generalist herbivore, the red howler monkey (Alouatta seniculus) under conditions of high and normal population density. Densities equivalent to 800–1000 km−2 (roughly 20–40 times normal) occurred in populations trapped on small, predator-free islands in Lago Guri, Venezuela. For three successive years, we studied one such population, a group of six animals living on a 0.6-ha island and compared its feeding ecology to that of two groups living at normal densities on a 190-ha island. The 0.6-ha island supported a total of 351 trees >10 cm dbh of 46 species, whereas >100 species probably occurred within the 16- and 23-ha home ranges of the two large-island howler troops. Small-island howlers were thus predicted to consume fewer resources, in particular less fruit, and to be less selective in diet choice than large-island howlers. As predicted, small-island howlers consumed fewer resources and obtained a smaller fraction of their intake from rare tree species (those contributing <1% of basal area). Small-island howlers consumed less fruit (2% of feeding time vs. 22%) and more foliage (73% vs. 55%) than the large-island groups. Diet breadth of small-island howlers was markedly less than that of their large-island counterparts. Tree species not present on the small island contributed ≥60% of leaf consumption by large-island howlers. Foliage sources preferred by large-island howlers were different in each of 3 years, whereas foliage of the same species of tree consistently ranked first on the small island. Long-term persistence (17 y) of self-perpetuating howler groups on Lago Guri islets at >20 times normal density strongly suggests that food availability does not limit mainland populations.

scholarly journals Pinworms of the red howler monkey (Alouatta seniculus) in Colombia: Gathering the pieces of the pinworm-primate puzzle

2020 ◽  
Vol 11 ◽  
pp. 17-28
Author(s):  
Brenda Solórzano-García ◽  
Andrés Link Ospina ◽  
Silvia Rondón ◽  
Gerardo Pérez-Ponce de León
Keyword(s):  
Howler Monkey ◽  
Alouatta Seniculus ◽  
Red Howler
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