Physiological effects of short-term water deprivation in the South American sigmodontine rice rat Oligoryzomys nigripes and water rat Nectomys squamipes within a phylogenetic context

de França Silveira Ribeiro, Martim; da Rocha, Pedro Luiz Bernardo; Mendes, Lys Angela Favaroni; Perry, Steven Franklin; Oliveira, Elisabeth Spinelli de
August 2004
Canadian Journal of Zoology;Aug2004, Vol. 82 Issue 8, p1326
Academic Journal
Ancestrally, oryzomyine rodents have a sylvan habit, but some species have colonized the semi-arid Brazilian Caatinga. Therefore, the clade provides a suitable model for studying adaptation to such environments within a phylogenetic framework. We investigated physiological responses to short-term water deprivation in two oryzomyine rodents kept in captivity. Oligoryzomys nigripes (Olfers, 1818), a small-bodied rodent, occupies the Caatinga, whereas Nectomys squamipes (Brants, 1827), which is larger and semi-aquatic, lives in moist habitats outside this region. Measurements were also carried out in three additional related species of intermediate body size. Neither O. nigripes nor N. squamipes displays exceptional ability to conserve water, and this condition appears to be plesiomorphic for the clade. The results for O. nigripes, such as the great absolute water intake and the high ratio of water ingested to urine voided, probably derive from allometric specializations correlated with its small body size and greater evaporative water loss. In N. squamipes, low urine osmolality and a reduction of food intake during water deprivation may be related to its semi-aquatic lifestyle. Therefore, the Oryzomyini exemplify Neotropical rodents that can occupy semi-arid environments with no remarkable physiological adaptation for water conservation.


Related Articles

  • Effects of Climate and Food Availability on Four Rodent Species in Southeastern Brazil. Bergallo, Helena Godoy; Magnusson, William Ernest // Journal of Mammalogy;May99, Vol. 80 Issue 2, p472 

    Examines the effects of weather and food availability on reproduction and population ecology of four rodent species in Southeastern Brazil. Nectomys squamipes; Oryzomys intermedius; Akodon cursor; Trinomys iheringi.

  • A newly recognized dade of trans-Andean Oryzomyini (Rodentia: Cricetidae), with description of a new genus. PINE, RONALD H.; TIMM, ROBERT M.; WEKSLER, MARCELO // Journal of Mammalogy;Jun2012, Vol. 93 Issue 3, p851 

    We expand upon recent studies on relationships within the Oryzomyini, in particular, those involving taxa currently assigned to the genus Sigmodontomys. In recent years, Sigmodontomys has been treated as including 2 species, alfari (J. A. Allen, 1897) and aphrastus (Harris, 1932), but throughout...

  • Phylogeny and micro-habitats utilized by lizards determine the composition of their endoparasites in the semiarid Caatinga of Northeast Brazil. Brito, S.; Corso, G.; Almeida, A.; Ferreira, F.; Almeida, W.; Anjos, L.; Mesquita, D.; Vasconcellos, A. // Parasitology Research;Nov2014, Vol. 113 Issue 11, p3963 

    Trophic networks can have architectonic configurations influenced by historical and ecological factors. The objective of this study was to analyze the architecture of networks between lizards, their endoparasites, diet, and micro-habitat, aiming to understand which factors exert an influence on...

  • A COMPARATIVE ASSESSMENT OF GROWTH CURVES AS ESTIMATORS OF MALE AND FEMALE ONTOGENY IN ORYZOMYS ALBIGULARIS. Moscarella, Rosa A.; Benado, Moritz; Aguilera, Marisol // Journal of Mammalogy;May2001, Vol. 82 Issue 2, p520 

    Features a study which analyzed growth of the sigmodontine rodent Oryzomys albigularis under laboratory conditions. Details on the life history of an organism; Materials and methods; Results.

  • Systematics of Oligoryzomys: Protein-electrophoretic analyses. Dickerman, A.W.; Yates, T.L. // Journal of Mammalogy;Feb95, Vol. 76 Issue 1, p172 

    Reports on allozymic variation that provides information on the phylogeny of the genus Oligoryzomys and some other oryzomyines. Examination of five species of Oligoryzomys, five species of Oryzomys, and representatives of Microryzomys, Neacomys, Nectomys, and Holochilus; Analysis of...

  • The end of the LINE?: Lack of recent L1 activity in a group of South American rodents. Casavant, N. Carol; Scott, LuAnn // Genetics;Apr2000, Vol. 154 Issue 4, p1809 

    Evaluates the implications of a long interspersed nuclear element 1 (LINE-1) extinction in South American rodents. Importance of the presence of LINE-1 in all mammals; Occurrence of L1 in placental mammalian and marsupials; Failure of the genomic Southern blot and the phylogenetic analyses in...

  • Cospeciation of ants and plants. Itino, Takao; Davies, Stuart J.; Tada, Hideko; Hieda, Yoshihiro; Inoguchi, Mika; Itioka, Takao; Yamane, Seiki; Inoue, Tamiji // Ecological Research; 

    Cospeciation, in which both parties of an ecological interaction speciate in parallel with each other, has rarely been reported in biotic associations except the cases for host–parasite interaction. Many tropical plants house ants and thereby gain protection against herbivores. Although...

  • Oligoryzomys stramineus Bonvicino and Weksler, 1998 (Mammalia: Rodentia: Sigmodontinae): New records in northeastern Brazil. Fernandes, Fabiano A.; D'Andrea, Paulo S.; Bonvicino, Cibele R. // CheckList;Jan2012, Vol. 8 Issue 1, p184 

    After morphological and karyological analysis, we identificated 12 specimens of the Straw Colored Pigmy Rice Rat, Oligoryzomys stramineus (Bonvicino and Weksler, 1998) in northeastern Brazil. Karyotypic analysis showed 2n=52, FNa=68, with 9 biarmed and 16 acrocentric autosome pairs, similar to...

  • Cladistic analysis and biogeography of the genus Oligoxystre Vellard 1924 (Araneae: Mygalomorphae: Theraphosidae). Guandanucci, José Paulo Leite // Journal of Arachnology;2011, Vol. 39 Issue 2, p320 

    The genus Oligoxystre was originally established in 1924 for O. auratum Vellard 1924 from southern state of Goifis, Central Brazil. Today, the genus includes seven species: O. auratum, O. caatinga Guadanucci 2007, O. bolivianum (Vol 2001), O. tucuruiense Guadanucci 2007, O. rufoniger Guadanucci...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics