Journal
BIOLOGICAL RHYTHM RESEARCH
Volume 34, Issue 2, Pages 157-166Publisher
SWETS ZEITLINGER PUBLISHERS
DOI: 10.1076/brhm.34.2.157.14491
Keywords
activity rhythm; cosinor method; neotropical rodents; Echimyidae; spiny; rats; Trinomys; Proechimys [T.] yonenagae; P. [T.] albispinus; Trichomys apereoides; Caatinga; semiarid
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The activity patterns of two closely related echimyid rodents (spiny rats) of the Brazilian Caatinga were studied. One species, Proechimys [Trinomys] yonenagae, is a fossorial dweller of fixed sand dunes. P [T] albispinus, inhabits remnants of the Atlantic rainforest areas. A third species, Trichomys apereoides, collected in granite formations in the Caatinga was also studied. The animals were kept individually in cages under controlled conditions and light-dark cycle of 12:12 h. Data were collect by Scan sampling every 2 h, over 3 days, and were analyzed by Cosinor method. All species were nocturnal. P yonenagae showed a regular pattern of circadian activity and restricted its activity to subjective night. P albispinus showed an intermittent pattern of activity, especially in the dark phase. T apereoides showed a bimodal pattern with high crepuscular peaks of activity. A high level of synchrony was found in the activity among individual P yonenagae. No sex differences were found in behavioral patterns of either P yonenagae or P albispinus. Since the two species of Proechimys share a common ancestor, the differences that were found stress the importance of external selection over circadian rhythmicity.
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