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Mammalian Biology

, Volume 79, Issue 3, pp 189–194 | Cite as

Swimming performance in semiaquatic and terrestrial Oryzomyine rodents

  • Ricardo Tadeu SantoriEmail author
  • Ana Cláudia Delciellos
  • Marcus Vinicius Vieira
  • Nivar Gobbi
  • Mariana Fiuza de Castro Loguercio
  • Oscar Rocha-Barbosa
Original Investigation

Abstract

Semiaquatic and terrestrial mammals frequently have to cross or move along water bodies, both trying to remain on the water surface using one or two pairs of limbs, combining different gaits and stride lengths and frequencies. This is the case of the semiaquatic water rats Nectomys and the cursorial Cerradomys, sister genera of the Oryzomyini tribe, capable of swimming using similar gaits. They provide an opportunity to investigate performance specializations involving the semiaquatic habitat, our objective in this study. Rodents were filmed at 30 frames s−1 in lateral view, swimming in a glass aquarium. Video sequences were analyzed dividing the swimming cycle into power and recovery phases. Differences in swimming performance were detected between species of Nectomys and Cerradomys, but not between species of the same genus. Absolute mean speed did not differ between the semiaquatic and terrestrial groups, but the semiaquatic Nectomys had longer stride lengths with lower stride frequency, whereas the terrestrial Cerradomys had higher stride frequency and relative swimming speed. The widest behavior repertoire of Nectomys allowed more efficient, but not necessarily faster swimming than the terrestrial Cerradomys. Efficient aquatic locomotion in Nectomys is ultimately a result of improved buoyancy by hydrophobic fur and subtle morphological specializations, which allow this genus to perform more efficiently in water than the terrestrial Cerradomys without compromising locomotion in the terrestrial environment.

Keywords

Cerradomys Stride frequency Locomotion Nectomys Speed 

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Copyright information

© Deutsche Gesellschaft für Säugetierkunde 2014

Authors and Affiliations

  • Ricardo Tadeu Santori
    • 1
    • 5
    Email author
  • Ana Cláudia Delciellos
    • 2
  • Marcus Vinicius Vieira
    • 2
  • Nivar Gobbi
    • 3
  • Mariana Fiuza de Castro Loguercio
    • 4
  • Oscar Rocha-Barbosa
    • 4
  1. 1.Núcleo de Pesquisa e Ensino de Ciências, Departamento de Ciências, Faculdade de Formação de ProfessoresUniversidade do Estado do Rio de JaneiroRio de JaneiroBrazil
  2. 2.Laboratório de Vertebrados, Departamento de EcologiaInstituto de Biologia, Universidade Federal do Rio de JaneiroRio de JaneiroBrazil
  3. 3.Departamento de Ecologia, Instituto de BiociênciasUniversidade Estadual PaulistaRio ClaroBrazil
  4. 4.Laboratório de Zoologia de Vertebrados – Tetrapoda, Departamento de ZoologiaInstituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de JaneiroRio de JaneiroBrazil
  5. 5.Departamento de CiênciasUniversidade do Estado do Rio de Janeiro, Faculdade de Formação de Professores, Rua Dr. Francisco Portela, 1470, Patronato, São GonçaloRio de JaneiroBrazil

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