Mazama gouazoubira


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Mazama gouazoubira
Species Authority: (G. Fischer [von Waldheim], 1814)
Common Name(s):
English Gray Brocket, Brown Brocket
Spanish Corzuela Común, Cabra Silvestre, Corzuela Parda, Guazu, Guazu Virá
Mazama gouazipira (G. Fischer, 1814) [orth. error]
Taxonomic Notes: Six morphological forms pertaining to the concept of Brown Brocket adopted here have been described as subspecies of Mazama simplicicornis (= M. gouazoubira) or M. gouazoubira ( Pinder and Leeuwenberg 1997). They are argentina Lönnberg, auritus Gray, kozeritzi Miranda-Ribeiro, mexianae Hagmann, namby Fitzinger, and superciliaris Gray. In his review of Brazilian species of Mazama, Rossi (2000) interpreted the morphological differences that led authors to describe auritus Gray, kozeritzi Miranda-Ribeiro, mexianae Hagmann, namby Fitzinger, and superciliaris Gray as individual variation among specimens of Mazama gouazoubira. We follow this author in not recognizing any subspecies from Brazil. The form argentina Lönnberg , not analyzed by Rossi (2000), remains the only one that could merit subspecific status. Nevertheless, a thorough analysis of the original description of Mazama simplicicornis argentina shows there are no characters in the type that cannot be explained by individual or geographical variation. Therefore, at the present time we see no reason to recognize either argentina Lönnberg or any other form cited above as subspecies of Mazama gouazoubira.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Black, P. & Vogliotti, A.
Reviewer(s): González, S. (Deer Red List Authority) & Schipper, J. (Global Mammal Assessment Team)
This species is considered to be Least Concern in view of its relatively large distribution, occurrence in a number of protected areas, presumed large populations which do not appear to be declining at a rate sufficient for a threat category at this time. Recent studies indicate that the distribution and abundance of the species do not warrant a threatened status at this time although populations are declining where they come in contact with human populations.
2000 Data Deficient

Geographic Range [top]

Range Description:The brown brocket deer is found east of the dry, pre-Andean regions in Argentina and Bolivia, extending to the Atlantic coast on the west; its northern limit is south of the Amazon region and its southern limit includes all of Uruguay and up to the province of Entre Rios in Argentina. Although some authors report its distribution throughout all of Brazil, more recent evidence indicates its substitution by M. nemorivaga in the region of the Amazon (Duarte 1996; Duarte and Jorge 1998; Rossi 2000; Weber and Gonzalez 2003).
Argentina; Bolivia, Plurinational States of; Brazil; Paraguay; Uruguay
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: Populations seem to be decreasing due to the advance of human populations. There is no evidence of fragmented populations and the species continues to be abundant in most of its range, decreasing or disappearing when close to human populations. Densities vary greatly. In Brazil densities of 0.35 – 1 individual/km² have been found (Pinder 1997); in Bolivia densities of 5-12 individuals/km² have been found (Rivero et al. 2004).
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species occurs in moderately humid to dry regions where there are areas of woody or brush cover. It is not found in the Amazon region and it avoids dense forests in other regions as well, although it occupies the edges of forests. It does not live in open areas but will feed in these areas, including many types of agricultural plantations, if cover is available nearby. It is found in both dry and moist Chaco regions (Cartes 1998; Chiarello 1999; Gonzalez 2004; Pinder 1997; Pinder and Leeuwenberg 1997; Rivero et al. 2005).

It eats a wide variety of plant species and is a selective feeder. It has pulses of frugivory depending on the area, season and availability of frutis, but is not essentially frugiverous in many areas; its habitat is not consistent with a frugivorous diet since it avoids forests where most of the fruit is found (Caballero 2001; Cartes 1998; Julia 2002; Pinder 1997; Stallings 1984).

Breeding occurs almost all year around with births in all months except May, June and July in Argentina and Bolivia and correlated with the rainy season in Brazil (Chavez 1999; Julia 2002). There is a post partum estrus and a gestation period of 7 months.

Mazama gouazoubira is a small to medium sized deer, with head and body length 882-1060 mm, tail length 83-190 mm, and ear length 95-121 mm (Rossi, 2000); shoulder height 500-650 mm and weight 11-25 kg (Duarte and Jorge 1998). In Brazil, regional, ecological and individual variations in coloration of M. gouazoubira have frequently been reported (Duarte 1996; Pinder and Leeuwenberg 1997; Rossi 2000). Light and brownish colors prevail in individuals living in grasslands, while forest populations tend to be darker and grayer; significant individual variation exists within a single population. M. gouazoubira can be readily distinguished from the most similar species, the Amazonian brown brocket Mazama nemorivaga, by its orange rump and dorsal side of the tail, larger rounded ears, smaller eyes and orbital cavities, and wider auditory bulla rather than chocolate brown rump and dorsal side of the tail, small pointed ears, large eyes, large orbital cavities, and narrow auditory bulla of the latter species (Duarte 1996; Rossi 2000).
Systems: Terrestrial

Use and Trade [top]

Use and Trade: Trade of this species is probably increasing (Julia 2002 pers. comm.).

Threats [top]

Major Threat(s): In Argentina populations are generally declining due to hunting pressure and habitat loss. International hunting expeditions are organized in Argentina (Julia 2002). In Bolivia the populations seem to be staying constant in spite of great hunting pressure. In Brazil this is the most abundant deer species in the country, but populations are declining in certain areas (Rio Grande do Sul, Rio de Janeiro). In Paraguay, the populations in general are remaining constant, but the species has disappeared from recently urbanized areas and areas of high human density. In general there is heaving hunting pressure and loss of animals due to kills by dogs as well as habitat loss.

Conservation Actions [top]

Conservation Actions: The species occurs in a number of protected areas throughout its distribution: 5 national parks and 9 provincial reserves in Argentina; in almost all national parks and private reserves in Paraguay; in 7 national protected areas in Bolivia and in numerous protected areas in Brazil. Hunting is illegal in many places (several Argentine provinces, for example) but the bans are not enforced. Recommended actions would be to implement and enforce controls on hunting, control stray dogs and to educate rural and village populations to conserve the deer rather than immediately trying to kill any individual that they see in the area.

Bibliography [top]

Caballero, M. 2001. Comparación de la dieta de la urina (Mazama gouazoupira) durante las épocas lluviosa y seca en la zona del Izozoz, Santa Cruz – Bolivia. Bachelor Thesis, Universidad Autonoma Gabriel Rene Moreno.

Cartes, J. L. 1998. Distribución y uso de hábitat de la corzuela parda en los Llanos de La Rioja, Argentina. Masters Thesis, Nacional University of Cordoba.

Chávez, V. 1999. Determinación de la estacionalidad de partos en urina (Mazama guazoubira). Trabajo de Pasantía.: 18 pp.

Chiarello, A. G. 1999. Effects of fragmentation of the Atlantic forest on mammal communities in south-eastern Brazil. Biological Conservation 89: 71-82.

Duarte, J. M. B. 1996. Guia de identificação de cervídeos brasileiros. FUNEP.

Duarte, J. M. B. and Jorge, W. 1998. Análise citotaxonômica dos Mazama cinzas do Brasil (Mazama gouazoubira e Mazama rondoni). Not paginated, in: Duarte, J.M.B. Análise citogenética e taxonômica do gênero Mazama (Cervidae; Artiodactyla) no Brasil. Ph.D. Thesis, Instituto de Biociências, Universidade Estadual Paulista.

González, S. 2004. Biología y conservación de Cérvidos Neotropicales del Uruguay.: 57 pp.

Julia, J. P. 2002. Autoecologia de la corzuela parda (Mazama gouazoubira, Fisher 1814) en el noroeste Argentina. Ph.D. Thesis, Universidad de Salamanca.

Pinder, L. 1997. Niche overlap among brown brocket deer, pampas deer and cattle in the Pantanal of Brazil. Ph.D. Thesis, University of Florida,.

Pinder, L. and Leeuwenberg, F. 1997. Veado-catingueiro (Mazama gouazoubira, Fisher 1814). In: J. M. B. Duarte (ed.), Biologia e conservação de cervídeos sul-americanos: Blastocerus, Ozotoceros e Mazama, pp. 60-68. FUNEP, Jaboticabal, São Paulo, Brazil.

Rivero, K., Rumiz, D. and Taber, A. 2004. Estimating brocket deer (Mazama gouazoubira and M. americana) abundance by dung pellet counts and other indices in seasonal Chiquitano forest habitats of Santa Cruz, Bolivia. European Journal of Wildlife Research 50: 161-167.

Rivero, K., Rumiz, D. and Taber, A. 2005. Differential habitat use by two sympatric brocket deer species (Mazama gouazoubira and M. americana) in a seasonal Chiquitano forest of Bolivia. Mammalia 69: 169-183.

Rossi, R. V. 2000. Taxonomia de Mazama Rafinesque, 1817 do Brasil (Artiodactyla, Cervidae). M.Sc. Thesis, Universidade de São Paulo.

Stallings, J. R. 1984. Notes on feeding habits of Mazama gouazoubira in the Chaco Boreal of Paraguay. Biotropica 16: 155-157.

Weber, M. and González, S. 2003. Latin American deer diversity and conservation: a review of status and distribution. Ecoscience 10(4): 443-454.

Citation: Black, P. & Vogliotti, A. 2008. Mazama gouazoubira. In: The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 31 March 2015.
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