Home-range and space use by Didelphis albiventris (Lund 1840) (Marsupialia, Didelphidae) in Mutum Island, Paraná river, Brazil

Biota Neotropica

Vítor Quadros Altomare Sanches²  Mariuciy Menezes De Arruda Gomes²  Fernando De Camargo Passos¹  Gustavo Graciolli²  Augusto Cesar De Aquino Ribas² 

[1] ,Universidade Federal do Mato Grosso do Sul Programa de Pós-graduação em Ecologia e Conservação Campo Grande MS ,Brazil

关键词: Atlantic Forest;    capture-recapture;    minimum convex polygon;    vertical habitat use;    white-eared-opossum;    Mata Atlântica;    captura-recaptura;    mínimo polígono convexo;    uso vertical do hábitat;    gambá-de-orelha-branca;   

DOI  :  10.1590/S1676-06032012000400004

来源: SciELO

【 摘 要 】

Home-range is the area used by an animal in its daily activities. Home-range studies provide data on species mating systems and territorial behavior. Our main goal was to estimate the Didelphis albiventris (Lund 1840) home-range in Mutum Island, Paraná River, Brazil. The study was carried out in 2008 from March to October on a 19.20 ha grid. The island is part of the Parana River Islands and Floodlands Federal Environmental Protection Area, with vegetation composed by Alluvial Semideciduous Seasonal Forest in a region of Subtropical Wet climate. The sampling effort was 3,360 traps-night resulting in 152 Didelphis albiventris (Lund 1840) captures. Forty-one Didelphis albiventris (Lund 1840) individuals were captured in 42 capture stations, composed by a trap placed on the floor and another in understory (2 m high). The animals were mostly terrestrial, independently of age or sex. Four females and five males, which were recaptured at least five times, were used to calculate home-range using the minimum convex polygon method. The mean home-range estimate was 2.33 ± 2.32 ha, similar to previous estimates provided by other methods, suggesting that our capture grid area, that was larger than usually applied for mark-capture studies for this species, have not underestimated the home-ranges. Evidences of the relation between individual home-range area and body mass were observed. Home-range overlaps occurred between males, females and males with females; the average overlap was 33.74%, which may be related to a promiscuous mating system, and suggests female territoriality.

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