Home range and birth seasonality ofSaguinus nigricollis graellsiin Ecuadorian Amazonia

Abstract

A field study of Saguinus nigricollis graellsi in the Cuyabeno Faunal Production Reserve, Ecuadorian Amazonia, established the characteristics of the home range and some reproductive aspects of the species. Field data were collected in two climatic seasons: dry, from December 1989 through March 1990, and rainy, from May through August 1990. Eight groups visited and/or lived in the study area during the dry season and ten during the rainy season. Group sizes ranged from two to nine individuals. Population density was estimated at 22-33 individuals per square km. The central group, which was followed intensively, had a home range which included both flooded and non-flooded forests. Terra firme forest was most used by the species. The home range of this group was reduced from 56.2 hectares (ha) in the dry season to 41.7 ha in the rainy season, probably as a result of a differential distribution of food plants between seasons. The presence of dense undergrowth where monkeys could hide to avoid predation and/or a high concentration of food plants seem related to the preferential use of certain areas in the home range. The home ranges of neighboring groups overlapped considerably and peaceful temporary large groups were frequently observed. A generalized birth peak occurred in January 1990, dry season. In June 1990, rainy season, 40% of the groups exhibited a second birth peak. This reproductive bimodality of S. nigricollis graellsi indicates a high productivity of the forests a t the Cuyabeno site. 0 1995 Wiley-Liss, Inc.

Densidad poblacional y tamaño de grupo de <i>Saguinus leucopus</i> en parches de bosque en el departamento de Caldas, Colombia

“…Sin embargo es necesario adelantar estudios en áreas inalteradas para poder evaluar la influencia de las condiciones actuales, sobre el tamaño, estructura y composición de los grupos. No obstante, otras especies del género en Colombia presentan tamaños de grupo similares (Lindsay, 1980;Savage, 1989;De la Torre et al, 1995;Defler, 2003Defler, , 2004Palacios et al, 2004). Por otro lado, se observaron grupos que podrían considerarse numerosos; con tamaños superiores a ocho individuos, en su mayoría adultos.…”

The Relationship between Body Size and Mixed-Species Troops of Tamarins (Saguinusspp.)

“…According to qualitative descriptions provided by Izawa [39], the forag ing behaviour of 5. nigricollis is essentially the same as that of S. fuscicollis. Further more, S. nigricollis shows a preference for heights lower than 10 m [40,41] and insect foraging takes place mainly at 0 -5 m [40]. The use of the same strata and substrates dur ing foraging means that the same microhabitats are searched for prey, resulting in a high overlap in the spectrum of animal prey.…”

The range of the golden-mantle tamarin, Saguinus tripartitus (Milne Edwards, 1878): distributions and sympatry of four tamarin species in Colombia, Ecuador, and northern Peru

“…Examination of the few data available on vertical space use by other members of the small-bodied Saguinus clade ( sensu Cropp et al 1999 ; that is S. n. nigricollis , S. n. graellsi , S. n. hernandezi , S. tripartitus ) also reveals similar or identical patterns of vertical space use. These taxa perform most of their activities at lower strata of the forest, as does S. fuscicollis (de la Torre et al 1995b ; Heymann 2000 ; Ulloa Vaca 1988 ; Vargas Tovar 1994 ). Qualitative and quantitative descriptions of the patterns of foraging also suggest that the different subspecies of S. fuscicollis and S. nigricollis , and S. tripartitus are also very similar or identical in this aspect (Heymann 2000 ; Izawa 1978 ; Peres 1993 ; Soini 1987 ).…”