Advertisement

Mammalian Biology

, Volume 70, Issue 6, pp 359–365 | Cite as

Microhabitat selection and daily movements of two rodents (Necromys lasiurus and Oryzomys scotti) in Brazilian Cerrado, as revealed by a spool-and-line device

  • E. M. VieiraEmail author
  • Graziela Iob
  • D. C. Briani
  • A. R. T. Palma
Original investigation

Abstract

Studies on patterns of habitat use by mammals are necessary for understanding the mechanisms involved in their distribution and abundance. In this study, we used the spool-and-line method to investigate habitat utilization by two sigmodontine rodents from Brazilian Cerrado, Necromys lasiurus and Oryzomys scotti. We conducted the study in a Cerrado area in central Brazil (15°56′S and e 47°56′W) where the animals were caught in an area of 7.68 ha of Cerrado sensu stricto. Captured individuals were marked, equipped with a spool-and-line device, and released at the same capture point. The next day we followed the thread to record their daily movements and find their nests. To investigate microhabitat selection we compared habitat characteristics along trails of each studied species with general habitat characteristics of the study area. Although the mean 24-h distance was greater for N. lasiurus (mean ± SE: 41.9 ± 42.2m, N=3) than for O. scotti (28.7 ± 14.2m, N=6) this difference was not significant (Mann–Whitney test, U=26, P>0.6). We detected significant differences among observed microhabitats variables of both species and available microhabitat characteristics as determined by discriminant analysis (Wilk′s lambda F=3.001; df=14, 116; P<0.001). Both species were associated to microhabitat characteristics whose values differed markedly from the overall available habitat. Along the first canonical discriminant function of the DFA both them were associated with greater grass height than the mean height available and along the second axis N. lasiurus selected areas with higher fruit availability and more shelters than those selected by O. scotti. For stronger inferences regarding differential patterns of habitat utilization by Cerrado rodents we suggest the simultaneous use of both spool-and-line and standard trapping methods.

Key words

Oryzomys scotti Necromys lasiurus habitat utilization rodents 

Mikrohabitatwahl und Tagesaktivitäten zweier Nagetierarten (Necromys lasiurus und Oryzomys scotti) im brasilianischen Cerrado

Zusammenfassung

Untersuchungen der Habitatwahl bei Säugetieren sind für das Verständnis der Mechanismen wichtig, die ihre Verbreitung und Häufigkeiten beeinflussen. In dieser Studie wendeten wir die Garnrollenmethode an, um die Habitatnutzung zweier Nagetierarten der Unterfamilie Sigmodontinae, Necromys lasiurus und Oryzomys scotti, im brasilianischen Cerrado zu untersuchen. Wir führten die Studie in einem Gebiet von 7.68 ha natürlicher Cerradovegetation in Zentralbrasilien (15°56′S und 47° 56′W) durch, wo die Versuchstiere nach dem Fang markiert und mit einer Garnrolle bestückt wurden. Alle Versuchstiere wurden am Fangort freigelassen. Am Tag nach der Markierung folgten wir dem Garn, um die Aktivität zu messen und die Nester zu finden. Wir verglichen die Mikrohabitatwahl der markierten Tiere mit den allgemeinen Habitatmerkmalen des Untersuchungsgebiets. N. lasiurus legte im arithmetischen Mittel während 24 Stunden eine gro¨ssere Entfernung (41.9m ± 42.2 Standartfehler; N=3) zurück als O. scotti (28.7 ± 14.2; N=6), jedoch war dieser Unterschied nicht signifikant (Mann-Whitney, U=26, P>0.6). Signifikante Unterschiede beobachteten wir beim Vergleich der genutzten Habitatvariablen mit den Habitateigenschaften durch Diskriminanz Analyse. Beide Nagetierarten waren mit Habitateigenschaften assoziiert, die markant von den allgemeinen Habitateigenschaften abwichen. Entlang der ersten Achse waren beide Arten mit ho¨herer Graslänge als die mittlere zur Verfügung stehende Graslänge assoziiert. Entlang der zweiten Achse wählte N. lasiurus Flächen mit ho¨herer Verfügbarkeit von Früchten und ho¨herer Unterstandsdichte als O. scotti aus.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Alho, C. J. R.; Vilella, O. M. M. (1984): Scansorial ability in Oryzomys eliurus and O. subflavus (Rodentia: Cricetidae) from the Cerrado. Rev. Brasil. Biol. 44, 403–408.Google Scholar
  2. Adamoli, J.; Macêdo, J.; Azevedo, L. G.; Netto, J. M. (1987): Caracterizaçao da região dos cerrados. In: Solos dos Cerrados: Tecnologias e Estratégias de Manejo, Ed. by W. J. Goedert, São Paulo. Brazil: Nobel S. A., Pp. 33–74.Google Scholar
  3. Briani, D. C.; Vieira, E. M.; Vieira, M. V. (2001): Nests and nesting sites of Brazilian forest rodents (Nectomys squamipes and Oryzomys intermedius) as revealed by a spool-and-line device. Acta Theriol. 46, 331–334.Google Scholar
  4. Briani, D. C.; Palma, A. R. T.; Vieira, E. M.; Henriques, R. P. B. (2004): Post-fire succession of small mammals in the Cerrado of central Brazil. Biodiv. Conserv. 13, 1023–1037.CrossRefGoogle Scholar
  5. Dalmagro, A. D.; Vieira, E. M. (2005): Patterns of habitat utilization of small rodents in an area of Araucaria forest in Southern Brazil. Austral. Ecol. 30, 353–362.CrossRefGoogle Scholar
  6. Freitas, S. R.; Cerqueira, R.; Vieira, M. V. (2002): A device and standard variables to describe microhabitat structure of small mammals based on plant cover. Braz. J. Biol. 62, 795–800.CrossRefGoogle Scholar
  7. Henriques, R. P. B.; Alho, C. J. R. (1991): Microhabitat selection by two rodent species in the cerrado of central Brazil. Mammalia 55, 50–56.CrossRefGoogle Scholar
  8. Henriques, R. P. B.; Bizerril, M. X. A.; Kohlsdorf, T. (1997): Abundância, riqueza e seleção de habitat de pequenos mamíferos dos cerrados do Brasil Central. In: Contribuição ao conhecimento ecológico do cerrado, Ed. by L. L. Leite, C. H. Saito. Brasília, Brazil: Universidade de Brasília, Pp. 127–130.Google Scholar
  9. Key, G. E.; Woods, R. D. (1996): Spool-and-line studies on the behavioural ecology of rats (Rattus spp.) in the Galapagos Islands. Can. J. Zool. 74, 733–737.CrossRefGoogle Scholar
  10. Lacher, T. E.; Alho, C. J. R. (1989): Microhabitat use among small mammals in the Brazilian pantanal. J. Mammalogy 70, 396–401.CrossRefGoogle Scholar
  11. Lacher, T. E.; Mares, M. A.; Alho, C. J. R. (1989): The structure of a small mammal community in a Central Brazilian savanna. In: Advances in Neotropical Mammalogy, Ed. by K. H. Redford. Gainesville, FL: Sandhill Crane Press, Pp. 137–162.Google Scholar
  12. Loretto, D.; Vieira, M. V. (2005): The effects of reproductive and climatic seasons on movements in the black-eared opossum (Didelphis aurita Wied-Neuwied, 1826). J. Mammalogy 86, 287–293.CrossRefGoogle Scholar
  13. Magnusson, W. E.; Sanaiotti, T. M. (1987): Dispersal of Miconia seeds by the rat Bolomys lasiurus. J. Trop. Ecol. 3, 277–278.CrossRefGoogle Scholar
  14. Mares, M. A.; Braun, J. K.; Gettinger, D. (1989): Observations on the distribution and ecology of the mammals of the Cerrado grasslands of Central Brazil. Ann. Carnegie Mus. 58, 1–60.Google Scholar
  15. Mares, M. A.; Ernest, K. A.; Gettinger, D. D. (1986): Small mammal community structure and composition in the cerrado province of central Brazil. J. Trop. Ecol. 2, 301–325.CrossRefGoogle Scholar
  16. Marinho-Filho, J.; Rodrigues, F. H. G.; Juarez, K. M. (2002): The Cerrado mammals: diversity, ecology, and natural history. In: The Cerrados of Brazil, Ed. by P. S. Oliveira, R. J. Marquis. New York: Columbia University Press, Pp. 266–284.CrossRefGoogle Scholar
  17. Miles, M. A.; Souza, A. A.; Povoa, M. M. (1981): Mammal tracking and nest location in Brazilian forest with an improved spool-and-line device. J. Zool. (London) 195, 331–347.CrossRefGoogle Scholar
  18. Murua, R.; González, L. A. (1982): Microhabitat selection in two Chilean cricetid rodents. Oecologia 52, 12–15.CrossRefGoogle Scholar
  19. Myers, N.; Mittermeier, R. A.; Mittermeier, C. G.; Fonseca, G. A. B.; Kent, J. (2000): Biodiversity hotspots for conservation priorities. Nature 403, 853–858.CrossRefGoogle Scholar
  20. Oliveira, P. E. (1998): Fenologia e biologia reprodutiva das espécies de Cerrado. In: Cerrado: Ambiente e Flora, Ed. by S. M. Sano, S. P. Almeida. Planaltina, Brazil: EMBRAPA CPAC, Pp. 169–192.Google Scholar
  21. Pinheiro, F.; Diniz, I. R.; Coelho, D.; Bandeira, M. P. S. (2002): Seasonal pattern of insect abundance in the Brazilian Cerrado. Austral. Ecol. 27, 132–136.CrossRefGoogle Scholar
  22. Pivello, V. R.; Norton, G. A. (1996): Firetool: an expert system for the use of prescribed fires in Brazilian savannas. J. Appl. Ecol. 33, 348–356.CrossRefGoogle Scholar
  23. Ratter, J. A. (1991): Guia para a vegetação da Fazenda Água Limpa (Brasília, DF), com chave para gêneros lenhosos de dicotiledoneas do cerrado. Brasília: Universidade de Brasília.Google Scholar
  24. Ratter, J. A.; Ribeiro, J. F.; Bridgewater, S. (1997): The Brazilian cerrado vegetation and threats to its biodiversity. Ann. Botany 80, 223–230.CrossRefGoogle Scholar
  25. Ryan, J. M.; Creighton, G. K.; Emmons, L. H. (1993): Activity patterns of two species of Nesomys (Muridae: Nesomyinae) in a Madagascar Rain Forest. J. Trop. Ecol. 9, 101–107.CrossRefGoogle Scholar
  26. Simonetti, J. A. (1989): Microhabitat use by small mammals in Central Chile. Oikos 56, 309–318.CrossRefGoogle Scholar
  27. Stapp, P. (1997): Habitat selection by an insectivorous rodent: patterns and mechanisms across multiple scales. J. Mammalogy 78, 1128–1143.CrossRefGoogle Scholar
  28. Vieira, E. M. (1999): Small mammal communities and fire in the Brazilian Cerrado. J. Zool. (London) 249, 75–81.CrossRefGoogle Scholar
  29. Vieira, M. V. (2003): Seasonal niche dynamics in coexisting rodents of the Brazilian Cerrado. Stud. Neotrop. Fauna Environ. 38, 7–15.CrossRefGoogle Scholar
  30. Vieira, E. M.; Baumgarten, L. C. (1995): Daily activity patterns of small mammals in a Cerrado area from central Brazil. J. Trop. Ecol. 11, 255–262.CrossRefGoogle Scholar
  31. Vieira, E. M.; Pizo, M. A.; IZAR, P. (2003): Fruit and seed exploitation by small rodents of the Brazilian Atlantic forest. Mammalia 67, 533–539.CrossRefGoogle Scholar
  32. Zar, J. H. (1996): Biostatistical Analysis. 3rd ed. Englewood Cliffs, NJ: Prentice-Hall.Google Scholar

Copyright information

© Deutsche Gesellschaft für Säugetierkunde 2005

Authors and Affiliations

  • E. M. Vieira
    • 1
    Email author
  • Graziela Iob
    • 2
  • D. C. Briani
    • 3
  • A. R. T. Palma
    • 4
  1. 1.Laboratorio de Ecologia de Mamíferos, Centro 2Universidade do Vale do Rio dos Sinos – UNISINOSSão LeopoldoBrazil
  2. 2.Laboratório de Populações e ComunidadesUniversidade Federal do Rio Grande do Sul – UFRGS-Av. Bento GonçalvesPorto AlegreBrazil
  3. 3.Departamento de Zoologia – UN-ESP-Av. 24-A No.1515 Bela VistaRio ClaroBrazil
  4. 4.Curso de Biologia, QS 7 Lote 1 Bloco M Sala 206Universidade Católica de BrasíliaBrasiliaBrazil

Personalised recommendations