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2012 | 57 | 2 |
Tytuł artykułu

Unvarying diet of a Neotropical desert marsupial inhabiting a variable environment: the case of Thylamys pallidior

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Języki publikacji
EN
Abstrakty
EN
Studies on the diet and other aspects of the natural history of Neotropical marsupials have focused mainly on a few species from tropical and forest habitats. Research on desert marsupials, on the other hand, is almost absent outside Australia. The desert mouse opossum, Thylamys pallidior, is a small marsupial which inhabits the arid lands of Argentina, Chile, Bolivia, and Peru. In Argentina, it occurs in the Monte desert, a highly seasonal system with a heterogeneous landscape which affords a good opportunity to perform comparisons among different environmental situations. We analyzed fecal samples from 123 individuals and compared their diet among different seasons, habitat types, sexes, and ages. The diet of T. pallidior was composed of 68.7% of arthropods and 31.3% of plant material, mainly leaves (24.6%). We found no significant differences in the proportions of any main food category consumed for any of the factors analyzed. Consumption of both plant and animal material seems to be important in the diet of T. pallidior which manages to keep their proportions constant despite the strong variability and seasonality of the habitat. Contrary to most didelphid species, but similarly to most mammals of this area, leaves seem to represent an important source of food possibly because of their abundance and stability in the Monte desert. This represents the first study to focus on the diet of a Thylamys species inhabiting an arid environment.
Słowa kluczowe
Wydawca
-
Czasopismo
Rocznik
Tom
57
Numer
2
Opis fizyczny
p.185-188,fig.,ref.
Twórcy
autor
  • Grupo de Investigaciones de la Biodiversidad (GIB) - Instituto Argentino de Investigaciones de Zonas Aridas (IADIZA), CCT Mendoza, CONICET, CC 507, 5500 Mendoza, Argentina
autor
  • Grupo de Investigaciones de la Biodiversidad (GIB) - Instituto Argentino de Investigaciones de Zonas Aridas (IADIZA), CCT Mendoza, CONICET, CC 507, 5500 Mendoza, Argentina
autor
  • Grupo de Investigaciones de la Biodiversidad (GIB) - Instituto Argentino de Investigaciones de Zonas Aridas (IADIZA), CCT Mendoza, CONICET, CC 507, 5500 Mendoza, Argentina
Bibliografia
  • Albanese MS (2010) Ecología de la marmosa pálida, Thylamys pallidior (Marsupialia, Didelphidae), en el desierto de Monte central. Doctoral thesis dissertation, Facultad de Ciencia Exactas y Naturales, Universidad de Buenos Aires, Argentina
  • Bisigato AJ, Villagra PE, Ares JO, Rossi BE (2009) Vegetation heterogeneity in the Monte Desert ecosystems: a multi-scale approach linking patterns and processes. J Arid Environ 73:182–191
  • Braun JK, Van Den Bussche RA, Morton PK, Mares MA (2005) Phylogenetic and biogeographic relationships of mouse opossums Thylamys (Didelphimorphia, Didelphidae) in Southern South America. J Mammal 86:147–159
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  • Cáceres NC, Ghizoni IR Jr, Graipel ME (2002) Diet of two marsupials, Lutreolina crassicaudata and Micoureus demerarae, in a coastal Atlantic Forest island of Brazil. Mammalia 66:331–340
  • Campos CM, Ojeda RA, Monge S, Dacar M (2001) Utilization of food resources by small and medium-sized mammals in the Monte Desert biome, Argentina. Austral Ecol 26:142–149
  • Carvalho FMV, Fernandez FAS, Nessimian JL (2005) Food habits of sympatric opossums coexisting in small Atlantic Forest fragments in Brazil. Mamm Biol 70:366–375
  • Chen X, Dickman CR, Thompson MB (1998) Diet of the mulgara, Dasycercus cristicauda (Marsupialia: Dasyuridae), in the Simpson Desert, central Australia. Wildl Res 25:233–242
  • Dacar MA, Giannoni SM (2001) A simple method of preparing reference slides of seeds. J Range Manag 54:191–193
  • Diaz GB, Ojeda RA, Dacar M (2001) Water conservation in the South American desert mouse opossum, Thylamys pusilla (Didelphimorphia, Didelphidae). Comp Biochem Physiolo A 130:323–330
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  • Dickman CR (1989) Patterns in the structure and diversity of marsupial carnivore communities. In: Morris DW, Abramsky Z, Fox BJ, Willig MR (eds) Patterns in the Structure of Mammalian Communities. Texas Tech University Press, Lubbock, pp 241–251
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  • Fisher DO, Dickman CR (1993) Diet of insectivorous marsupials in arid Australia: selection for prey type, size or hardness? J Arid Environ 25:397–410
  • Fox BJ, Archer E (1984) The diets of Sminthopsis murina and Antechinus stuartii (Marsupialia: Dasyuridae) in sympatry. Aust Wildl Res 11:235–248
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  • Giarla TC, Voss RS, Jansa SA (2010) Species limits and phylogenetic relationships in the didelphid marsupial genus Thylamys based on mitochondrial Dna sequences and morphology. Bull Am Mus Nat Hist 346:1–67
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  • Lagos SJ (2003) Diversidad biológica de las comunidades de artrópodos epigeos en áreas pastoreadas y no pastoreadas del Monte (Argentina). Doctoral thesis dissertation, Programa de Postgrado en Ciencias Biológicas (PROBIOL) Universidad Nacional de Cuyo, Argentina
  • Leiner NO, Silva WR (2007) Seasonal variation in the diet of the Brazilian slender opossum (Marmosops paulensis) in a montane Atlantic forest area, southeastern Brazil. J Mammal 88:158–164
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  • Martins EG, Bonato V, Pinheiro A, dos Reis SF (2006) Diet of the gracile mouse opossum (Gracilinanus microtarsus) (Didelphimorphia: Didelphidae) in a Brazilian Cerrado: pattern of food consumption and intrapopulation variation. J Zool 269:21–28
  • Morello J (1958) La provincia fitogeográfica del Monte. Opera Lilloana 2:1–155
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  • Ojeda RA, Campos CM, Gonnet JM, Borghi CE, Roig VG (1998) The MaB Reserve of Ñacuñan, Argentina: its role in understanding the Monte Desert biome. J Arid Environ 39:299–313
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Typ dokumentu
Bibliografia
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