Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest

We examined population dynamics in mantled howlers (Alouatta palliata palliata) in a regenerating tropical dry forest in Santa Rosa National Park (SRNP), Costa Rica. The population has grown at a rate of about 7% per annum during the past decade. The growth in numbers from 342 in 1984 to 554 in 199...

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Main Authors: Fedigan, Linda M., Rose, Lisa M., Morera Avila, Rodrigo
Format: Artículo
Language: Inglés
Published: Universidad Nacional, Costa Rica. 2022
Subjects:
Online Access: http://hdl.handle.net/11056/23445
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spelling RepoUNACR234452023-09-25T21:00:48Z Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest Fedigan, Linda M. Rose, Lisa M. Morera Avila, Rodrigo CONSERVATION COSTA RICA DEMOGRAPHY FOREST REGENERATION HOWLERS CONSERVACIÓN DEMOGRAFÍA REGENERACIÓN FORESTAL AULLADORES We examined population dynamics in mantled howlers (Alouatta palliata palliata) in a regenerating tropical dry forest in Santa Rosa National Park (SRNP), Costa Rica. The population has grown at a rate of about 7% per annum during the past decade. The growth in numbers from 342 in 1984 to 554 in 1992 reflects an increase in the number of groups (from 25 to 34) and a slight increase in their average size (from 13.6 to 16.3). Population density has increased from 4.9 to 7.9 individuals per km2 . Santa Rosa’s population density and group compositions are similar to those at several other mantled howler sites, but densities of mantled howlers are much higher at two other well-studied sites: La Pacifica and Barro Colorado Island (BCI). We relate the low density of howlers at Santa Rosa to local historical and ecological factors. Howler populations at high and low densities differ in average group size and sex ratio. At high population densities, groups are larger and include more adult females. The number of male howlers per group appears to be more strictly limited and less variable than the number of females is. However, there is greater variation in male group membership at Santa Rosa than at La Pacifica or BCI, and at Santa Rosa there are more generating forests available into which males and females can disperse and form new groups. We present case studies describing two ways in which new howler groups are formed, and we suggest that, compared to females and compared to males at high density sites, males are relatively advantaged in the uncrowded habitats at Santa Rosa and other low density sites. Examinamos la dinámica poblacional de los aulladores de manto (Alouatta palliata palliata) en un bosque tropical seco en regeneración en el Parque Nacional Santa Rosa (PNSR), Costa Rica. La población ha crecido a un ritmo de alrededor del 7% anual durante la última década. El crecimiento en número de 342 en 1984 a 554 en 1992 refleja un aumento en el número de grupos (de 25 a 34) y un ligero aumento en su tamaño medio (de 13,6 a 16,3). La densidad de población ha aumentado de 4,9 a 7,9 individuos por km2. La densidad de población de Santa Rosa y la composición de los grupos son similares a las de otros sitios de aulladores de manto, pero las densidades de aulladores de manto son mucho más altas en otros dos sitios bien estudiados: La Pacífica y la Isla Barro Colorado (BCI). Relacionamos la baja densidad de aulladores en Santa Rosa con factores históricos y ecológicos locales. Las poblaciones de aulladores con densidades altas y bajas difieren en el tamaño promedio del grupo y la proporción de sexos. A altas densidades poblacionales, los grupos son más grandes e incluyen más hembras adultas. El número de aulladores machos por grupo parece ser más estrictamente limitado y menos variable que el número de hembras. Sin embargo, hay mayor variación en la membresía de los grupos de machos en Santa Rosa que en La Pacífica o BCI, y en Santa Rosa hay más bosques generadores disponibles en los cuales los machos y las hembras pueden dispersarse y formar nuevos grupos. Presentamos estudios de caso que describen dos formas en que se forman nuevos grupos de aulladores, y sugerimos que, en comparación con las hembras y en comparación con los machos en sitios de alta densidad, los machos son relativamente aventajados en los hábitats no hacinados en Santa Rosa y otros sitios de baja densidad. Universidad Nacional, Costa Rica. Instituto Internacional en Conservación y Manejo de Vida Silvestre 2022-07-08T14:58:15Z 2022-07-08T14:58:15Z 1998 http://purl.org/coar/resource_type/c_6501 01640291 http://hdl.handle.net/11056/23445 eng Acceso abierto http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Universidad Nacional, Costa Rica. Revista International Journal of Primatology vol.19 no.3 1998
institution Universidad Nacional de Costa Rica
collection Repositorio UNA-Costa Rica
language Inglés
topic CONSERVATION
COSTA RICA
DEMOGRAPHY
FOREST REGENERATION
HOWLERS
CONSERVACIÓN
DEMOGRAFÍA
REGENERACIÓN FORESTAL
AULLADORES
spellingShingle CONSERVATION
COSTA RICA
DEMOGRAPHY
FOREST REGENERATION
HOWLERS
CONSERVACIÓN
DEMOGRAFÍA
REGENERACIÓN FORESTAL
AULLADORES
Fedigan, Linda M.
Rose, Lisa M.
Morera Avila, Rodrigo
Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest
description We examined population dynamics in mantled howlers (Alouatta palliata palliata) in a regenerating tropical dry forest in Santa Rosa National Park (SRNP), Costa Rica. The population has grown at a rate of about 7% per annum during the past decade. The growth in numbers from 342 in 1984 to 554 in 1992 reflects an increase in the number of groups (from 25 to 34) and a slight increase in their average size (from 13.6 to 16.3). Population density has increased from 4.9 to 7.9 individuals per km2 . Santa Rosa’s population density and group compositions are similar to those at several other mantled howler sites, but densities of mantled howlers are much higher at two other well-studied sites: La Pacifica and Barro Colorado Island (BCI). We relate the low density of howlers at Santa Rosa to local historical and ecological factors. Howler populations at high and low densities differ in average group size and sex ratio. At high population densities, groups are larger and include more adult females. The number of male howlers per group appears to be more strictly limited and less variable than the number of females is. However, there is greater variation in male group membership at Santa Rosa than at La Pacifica or BCI, and at Santa Rosa there are more generating forests available into which males and females can disperse and form new groups. We present case studies describing two ways in which new howler groups are formed, and we suggest that, compared to females and compared to males at high density sites, males are relatively advantaged in the uncrowded habitats at Santa Rosa and other low density sites.
format Artículo
author Fedigan, Linda M.
Rose, Lisa M.
Morera Avila, Rodrigo
author_sort Fedigan, Linda M.
title Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest
title_short Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest
title_full Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest
title_fullStr Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest
title_full_unstemmed Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest
title_sort growth of mantled howler groups in a regenerating costa rican dry forest
publisher Universidad Nacional, Costa Rica.
publishDate 2022
url http://hdl.handle.net/11056/23445
_version_ 1796097299766575104
score 12.248849