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Abstract
Behavior is a useful trait for comparative studies that provide the comprehension of phylogenetic relationships among species. Here, we present a description of two spiny-rats species' behavioral repertoire, Clyomys laticeps and Trinomys setosus (Rodentia: Echimyidae). The affiliative and agonistic behavioral patterns were sampled during a three-year study of captive populations of wild animals. Observational data were collected in two phases under different arrangements of individuals in groups. We also compare the behavioral traits of T. setosus and C. laticeps with the known behavioral patterns of Trinomys yonenagae. We add categories to the previous descriptions of T. setosus and a standard ethogram for C. laticeps. Trinomys setosus showed a visual and vocal display we called foot-trembling, which was not described in this form and function for other species studied until now. We discuss the differences in their sociality levels and similarities and differences among behavior patterns and repertoires.
Highlights
Behavioral categorization is the obligated start point of fundamental research in Ethology (Lehner, 1996; Burkhardt, 2005)
Trinomys setosus has a higher level of sociality than Clyomys, according to their relative tolerance to conspecifics of both sexes and the group cohesion (Lacher, 1981; Schwarz-Weig and Sachser, 1996; Adrian and Sachser, 2011)
Aggressions in T. setosus were directed to newborns and juveniles and less commonly recorded among adults; in Clyomys, aggressions were mostly from females to males and occurred between females
Summary
Behavioral categorization is the obligated start point of fundamental research in Ethology (Lehner, 1996; Burkhardt, 2005). Particular behaviors allow functional hypothesis propositions about their mechanisms, developmental processes, and distal causations (Tinbergen, 1963; Ten Cate, 2009). Differences among species in affiliative and aggressive displays may provide insights about signal evolution and phylogenetic relationships (Lorenz, 1966). Animal welfare science has improved life quality by knowing better the socio-cognitive abilities of domestic species (e.g., Briefer et al, 2015) and investigating molecular mechanisms related to the evolution of behavioral complexity and sophistication (Grant, 2016). Despite their importance, most of the Neotropical species repertoires were not described. Most of what is known about mammal’s behavior from a comparative perspective came from populations of free-living animals
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Schedule a callMore From: Brazilian journal of biology = Revista brasleira de biologia
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