Results 61 to 70 of about 856 (158)

Crepuscular Rhythms of EEG Sleep-Wake in a Hystricomorph Rodent, Octodon degus

Journal of Biological Rhythms, 1998
Sleep-wake circadian rhythms are well documented for nocturnal rodents, but little is known about sleep regulation in diurnal or crepuscular rodent species. This study examined the circadian sleep-wake rhythms in Octodon degus by means of electroencephalogram (EEG) analysis.
M J, Kas, D M, Edgar
openaire   +7 more sources

Actividad ovárica del tepezcuintle Agouti paca (Rodentia: Agoutidae) en cautiverio

Revista de Biología Tropical, 2006
Se caracterizó la actividad ovárica de A. paca por medio de perfiles hormonales y estructuras ováricas. Se muestrearon ocho hembras (siete adultas y una juvenil) en el criadero de la Facultad de Medicina Veterinaria y Zootecnia en el estado de Yucatán ...
Rubén C Montes Pérez, Elsy A Cabrera Baz   +1 more
doaj  

Seasonality in Reproduction and Reproductive Physiology of Caviomorphs

Mammal Review, Volume 55, Issue 3, July 2025.
ABSTRACT Animals experience seasonal fluctuations of photoperiod, food availability, temperature and precipitation. This affects their energy budget, often leading to seasonal reproduction. We review available literature and (re)‐analyse existing datasets on seasonal reproduction of South American caviomorph rodents that are characterised by long ...
Anja Guenther, Patricia Tachinardi, Veronica Sandra Valentinuzzi, Raúl Sobrero, Ayelen T. Eberhardt, Fritz Trillmich   +5 more
wiley   +1 more source

Beyond CREA: Evolutionary patterns of non‐allometric shape variation and divergence in a highly allometric clade of murine rodents

Ecology and Evolution, Volume 14, Issue 7, July 2024.
Rodent skulls display a highly conserved, strongly size‐dependent (allometric) range of shapes that is commonly found across mammals. We here use geometric morphometric analysis of Australian rodent cranial shape to show that this scaling is likely an emergent property of the specialised feeding biomechanics of most rodents, with other non‐size‐related
Ariel E. Marcy, D. Rex Mitchell, Thomas Guillerme, Matthew J. Phillips, Vera Weisbecker   +4 more
wiley   +1 more source

Digging for answers: contributions of density- and frequency-dependent factors on ectoparasite burden in a social mammal [PDF]

, 2015
Due to the density-dependent nature of parasite transmission parasites are generally assumed to constrain the evolution of sociality. However, evidence for a correlation between group size and parasite burden is equivocal, particularly for mammals.
Archer, EK, Bennett, NC, Faulkes, CG, Lutermann, H   +3 more
core   +2 more sources

Springhares, flying and flightless scaly‐tailed squirrels (Anomaluromorpha, Rodentia) are the squirrely mouse: comparative anatomy of the masticatory musculature and its implications on the evolution of hystricomorphy in rodents

Journal of Anatomy, Volume 244, Issue 6, Page 900-928, June 2024.
The digital dissection of the masticatory musculature of (a) Anomalurus, (b) Idiurus, (c) Zenkerella, and (d) Pedetes reveals a great degree of diversity in morphology. These taxa present a hystricomorphous condition of the skull that largely differs from those of other rodents with an enlarged foramen and reaffirms the significance of the descriptive ...
Léa Da Cunha, Pierre‐Henri Fabre, Lionel Hautier   +2 more
wiley   +1 more source

Embryonic and fetal morphology in the lowland paca (Cuniculus paca): A precocial hystricomorph rodent

Theriogenology, 2017
In mammals, the embryonic and fetal development of a species has evolved to maximize neonatal survival. In this study, we use a sample of 132 embryos/fetuses of wild lowland paca (Cuniculus paca), obtained over a period of 15 years through collaborative methods with local hunters in the Amazon to describe the intrauterine development of external and ...
Hani Rocha, El Bizri, Frederico Ozanan Barros, Monteiro, Rafael Dos Santos, de Andrade, João, Valsecchi, Diva Anelie de Araújo, Guimarães, Pedro, Mayor   +5 more
openaire   +2 more sources

Comparative selective retention of particle size classes in the gastrointestinal tract of ponies and goats [PDF]

, 2017
There is a discrepancy in the literature on potential digesta separation mechanisms in horses, with both a selective retention of fine and of large particles postulated in different publications. To assess the net effect of such mechanisms, we fed ponies
Argenzio, Bachmann, Bjorndal, Björnhag, Björnhag, Björnhag, Björnhag, Björnhag, Brosnahan, Campbell, Carmalt, Carmalt, Clauss, Clauss, Clauss, Clauss, Clauss, Clauss, Collatos, Cox, Dabareiner, Decker, Dhanoa, Dittmann, Dittmann, Drogoul, Du Toit, Ellis, Franz, Frei, Fritz, Fritz, GfE, Gunnarsdottir, Hagen, Huhtanen, Hume, Hummel, Janis, Janzen, Jensen, Jerbi, Kienzle, Kienzle, Lanyon, Lauper, Lechner-Doll, Lopes, Matsuda, Menke, Meyer, Munn, Müller, Müller, Owens, Rakestraw, Rensberger, Schwabenbauer, Schwarm, Schwarm, Schwarm, Sellers, Sperber, Thielemans, Udén, Udén, Udén, Van Soest, Van Weyenberg, VDLUFA, Vispo, Zeyner, Zwirglmaier   +72 more
core   +1 more source

Evolutionary patterns of mandible shape diversification of caviomorph rodents [PDF]

, 2020
Caviomorphs are a mainly South American rodent clade with high taxonomic and ecomorphological diversity. In this study, we combine geometric morphometric, functional, ancestral reconstruction, and macroevolutionary analyses to quantify the magnitude ...
Alvarez, Alicia, de Santi, Nahuel Antu, Ercoli, Marcos Darío, Olivares, Adriana Itati, Verzi, Diego Hector   +4 more
core   +1 more source

Digestive physiology of the plains viscacha (Lagostomus maximus): a large herbivorous hystricomorph rodent

Zoo biology, 2015
Plains viscachas (Lagostomus maximus) are large South American, fossorial rodents susceptible to diabetic cataracts. Various aspects of their digestive physiology were studied in three different experiments with nine male and seven female adult animals and six different diets (total n of feeding trials = 35).
Hagen, Katharina B, Besselmann, Dorothea, Cyrus-Eulenberger, Ulrike, Vendl, Catharina, Ortmann, Sylvia, Zingg, Robert, Kienzle, Ellen, Kreuzer, Michael, Hatt, Jean-Michel, Clauss, Marcus   +9 more
openaire   +4 more sources