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Social Ecology of the Huemul at Torres Del Paine National Park, Chile

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Social Ecology of the Huemul at Torres Del Paine National Park, Chile Anales Instituto Patagonia (Chile), 2016. Vol. 44(1):25-38 25 Social Ecology of the huemul at Torres Del Paine National Park, Chile Ecología Social del huemul del Parque Nacional Torres Del Paine, Chile Gladys Garay1, Isaac M. Ortega2 & Oscar Guineo1 Abstract while yearlings were temporarily expelled from their In a ten-year study of the huemul (Hippocamelus natal group but remained within the home range, bisulcus) population at Torres del Paine National thus sometimes the three members of the group Park in southern Patagonia, we covered a wide were seen alone. These critical periods increased range of information regarding the ecology of this antagonism among huemuls, generating changes endanger deer. We determined the huemul social in their group structure. Movements associated structure, social behavior, reproductive season, with huemul in the park consisted of movements and associated movements throughout the year. within the home range, seasonal movements, Huemuls were observed in the park central area of dispersion of the yearlings, and movements during Sector Grey. When animals were located, natural the reproductive period. marks or scars, coloring of body and face, and antler characteristics were used to identify them. Key words: We also ear tagged sixteen fawns from 2002 to Hippocamelus bisulcus, social structure, 2008. Behavioral information was collected from reproduction, dispersion, Chilean Patagonia. all members with focal observations. We found established and transient social groups. Among Resumen the established we found family groups, solo Este es un estudio de la población de huemules female, and solo male, and among the transient (Hippocamelus bisulcus) del Parque Nacional Torres we found solo female, solo male, solo yearling, del Paine, en el sur de la Patagonia, durante 10 pair of yearlings, and mixed groups. Family groups años, lo que nos permitió obtener un amplio rango were observed throughout the year since they de información de los aspectos socio ecológicos de remained in the same area. We observed the first este ciervo en peligro de extinción. Determinamos mating of marked females at about 16 months of la estructura social, las interacciones sociales, etapa age. We were not able to determine male age of reproductiva, y los movimientos asociados a lo largo their first mating, since they left the study site as del año. Los huemules fueron observados en un yearlings. Females gave birth from late October área central del Sector Grey. Una vez localizados los to mid-November. The home range varied from animales, estos fueron identificados usando marcas 269 to 336 ha for the established family group. Huemul movements were associated with seasons 1 Paraguaya 126, Punta Arenas, Chile. gladysenviaje@ and reproduction cycles, which also implies group yahoo.com (GG); [email protected] (OG). changes. During the rut, some transient solo males 2 tried to move into home ranges of established Department of Natural Resources and the Environment, Unit 4087, University of Connecticut, Storrs, CT, 06269. family groups. During the birthing season, pregnant [email protected] females remained alone for short periods of time, Received: Mar. 13. 2016 Accepted: May. 24, 2016 26 G. GARAY et al. naturales, cicatrices, color del pelaje y características from Bio-Bio to Magallanes Region (Vila et al. de la cornamenta en los machos, además de 2006). There have been no recent estimates of the aretes numerados en 16 cervatillos marcados entre population in Chile. el 2002 y el 2008. Se colectó información de Long-term studies on the social structure comportamiento de los integrantes de los grupos, of huemul are unavailable at this time; only short- a través de observaciones focales. Encontramos term studies have been published. Some studies dos tipos de grupos, los grupos establecidos y los have considered groups of one to seven animals grupos transientes Entre los grupos establecidos in the Chilean Tamango National Reserve (Flueck encontramos grupos familiares, hembras solas and Smith-Flueck, 1993) to groups of ten animals y machos solos, en tanto que entre los grupos in Lago Argentino (Díaz & Smith-Flueck, 2000). transientes encontramos hembras solas, machos These studies mentioned some activities and solos, juveniles solos, juveniles en pares y grupos behavior of huemul during certain periods of mixtos. Los grupos familiares permanecieron the year or describe specific behaviors, such as en la misma área durante todo el año. El primer behavior during the reproductive season (Colomes, apareamiento en hembras marcadas fue a los 16 1978; Rau, 1980; Povilitis, 1983, 1985; Aldridge, meses. Los cervatillos nacieron a partir de fines de 1988; Frid, 1999, Anonymous, 2006). Octubre hasta mediados de Noviembre. No pudimos Collecting long-term information to properly determinar la edad del primer apareamiento de los manage an endangered species is necessary machos, pues los marcados se fueron del área siendo to learn about its habitat use and critical social juveniles. Las hembras preñadas permanecieron behaviors throughout the year. This is especially aisladas por cortos períodos de tiempo durante el true for endangered populations living in protected nacimiento de cervatillos, en tanto que los juveniles areas such as national parks or reserves. Managers fueron temporalmente expulsados de su grupo, of these reserves require behavioral knowledge permaneciendo en su rango de hogar, de modo to better accommodate the species, as well as to que los tres integrantes del grupo se vieron solos. properly manage tourists to avoid disturbing the Estos períodos críticos aumentan el antagonismo normal activities of the huemuls. entre los huemules, lo cual genera cambios en su This study was conducted in the Torres estructura. Hubieron cuatro tipos de movimientos o del Paine National Park, Magallanes, Chile. It is traslados de los animales: dentro de los rangos de perhaps one of the first long-term research studies, hogar, reproductivos, estacionales y de dispersión de Nov 1999 to Nov 2009, on a huemul population los juveniles. in Chile. The ten-year observations allowed us to cover a wide range of information regarding the Palabras clave: socioecology of the huemul at Torres del Paine Hippocamelus bisulcus, estructura social, National Park. We present here aspects of social reproducción, dispersión, Patagonia Chilena. structure, and social and reproductive behavior of this huemul population. We also include how INTRODUCTION changing seasons and reproductive behavior affect their social structure and the movements of The huemul (Hippocamelus bisulcus, individuals. Molina 1782) is the largest native deer found in Chile and it is considered a national symbol. The METHODS species is endangered (Jimenez et al. 2008) with a population ranging from 1,000 to 1,500 dispersed Study area in small populations in Chile and Argentina (Flueck, 2009). Flueck and Smith-Flueck (2006) have a The study area is located in the western side more pessimistic count, estimating the Argentinean of Torres del Paine National Park (51° 08’S, 73° huemul population to range between 350 and 600 04’W), in the Magallanes Region of Chile in southern individuals. In Chile, Drouilly (1983) estimated the Patagonia. Although we may have had over 60 deer population from 350 to 1,000 huemuls distributed in the area (Guineo et al. 2008), we chose to study HUEMUL SOCIAL ECOLOGY 27 Fig. 1. Location of the study area at Torres del Paine National Park, Magallanes, Chile. The dotted line shows the boundaries of the study site (Source: Google Earth1 2013, Image © 2016 CNES/Astrium). 1 Google Earth. (2016). Version 7.1.5.1557. Image © 2016 CNES/Astrium). Imagery Date: 19 Nov 2013. 28 G. GARAY et al. groups that were closest to the last point of vehicular 2009. From 1999 to 2003, a permanent route access in the area of Lago Grey. This is a vast area was visited on a monthly basis to assess the number with a very broken topography of about 375 km2. of huemuls in the area, and to help us determine Our study site covered approximately 23km2 that the best areas for long periods of observation of included five areas, a) Mount Ferrier (300 ha), b) known groups. We continued monitoring the Pochongo Hill (296 ha), c) Moraine Margaritas (367 huemul on a bi-monthly visits from 2004 to 2006, ha), d) Cañadon and Mirador Hills (314 ha), and e) then we monitored the huemul every three months Huemules and Eagle Hills (319ha) (Figs. 1 and 2). from 2007 to 2009. From 2001 onwards the Ferrier area was eliminated In each visit to the study site we walked because it was the most difficult to access (600 m through the five areas using the established route climb to cover approximately 300 ha). in search of huemuls. Animals were detected by Topographically the study area is very uneven constantly scoping the area aided with long-range because of the great orogenic activity and glacial- binoculars (Tasco 10x-30x 50). It took several fluvial action, containing many inclined rocky slopes hours to several days to find the huemuls due to and moraines. It is located on the Trans-Oceanic the challenging environmental conditions and ecological region and the Andean region (DiCastri, extended area of the study site, which included 1968) and has an average precipitation of 800 to dense vegetation, rough topography and soil 850 mm per year. It can be included within the conditions, presence of snow or rain, constant range of the Eastern pre-cordillera with Magellan Patagonian wind, and the low density of animals. vegetation of deciduous and mixed deciduous/ To determine the social structure, we perennial forests (Pisano, 1974). Its periglacial recorded the composition (number of animals, sex location has suffered the colonizing human influence and age) of the groups found and established their for nearly 100 years, manifested in large forest geographic position with a Garmin GPS Plus. This fires to open grazing areas, which has generated data helped us to verify the animal movements the presence of patches of bushes of various sizes in the area.
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