INVESTIGADORES
VALENTINUZZI veronica Sandra
congresos y reuniones científicas
Título:
Temporal dissociation between activity and body temperature rhythms of a subterranean rodent (Ctenomys aff. knighti) in field enclosures
Autor/es:
JANNETTI MG; TACHINARDI P; VALENTINUZZI VS; ODA GA
Reunión:
Simposio; XVI Latin American Symposium on Chronobiology-LASC; 2021
Resumen:
Locomotor activity and body temperature (Tb) rhythms are tightly synchronized in rodents in the lab, even when submitted to different artificial light and temperature conditions. Several rodents, when transferred from field to lab, switch their activity phase from diurnal to nocturnal, but their synchrony with Tb in the field was not systematically verified. For a better interpretation of Tb field data, we compared synchrony of Tb and activity for a wild subterranean rodent (tuco-tuco; Ctenomys sp.) in the field and in the lab. 6 animals (157g±32g) with accelerometers (Axy-4, 2g, 23x12x10mm, bin interval 10Hz, range ±4G-forces, precision 8 bits; Technosmart, IT) and implanted Tb sensors (DS1925 iButton, 3.3g, 17.3×6.4mm, 5min, 0-50°C, 0.0625°C; Maxim Integrated, US) were released inside field enclosures (12mx6mx1.5m) and transferred after 20 days to lab for 10 days. Levels of synchrony were quantified using the percentage of temporal coincidence between activity and high Tb. Synchrony was consistently lower in field than in lab and Tb rhythms had higher interindividual variation than activity rhythms. Disagreement in diurnality between Tb and activity suggests that coordination of Tb rhythms must be separated from the pathway that controls activity switches. Further investigating tuco-tucos daily rhythms can help us understand the high interindividual variation in their Tb rhythms, as well as the looser relationship between activity and Tb in the field compared to the lab.