dc.creatorMurillo-García,Oscar-E.
dc.creatorDe-la-Vega,Maria-E.
dc.creatorPérez-Castillo,Katherine
dc.date2020-12-01
dc.date.accessioned2023-09-25T14:22:19Z
dc.date.available2023-09-25T14:22:19Z
dc.identifierhttp://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442020000401275
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8818535
dc.descriptionAbstract Introduction: Body size is an essential trait for endotherms to face the physiological requirements of cold, so there is a tendency to large body size at high altitudes and latitudes, known as Bergmann’s rule. However, the validity of this ecomorphological rule to small-bodied endotherms across altitudinal gradients is poorly known. Objective: To understand the effects of environmental variation on body size, we assessed whether interspecific variation in body size of small tropical endotherms follows Bergmann’s rule along tropical altitudinal gradients. Methods: We compiled data on elevational ranges and body masses for 133 species of hummingbirds of Colombia. We then assessed the association between body mass and mid-point of the altitudinal distribution using phylogenetic generalized least squares (PGLS) analyses under different evolutionary models. Results: We found a decelerating rate of evolution for body size since the Early Burst model of evolution provided a better fit to body mass data. For elevational range, we found a slow and constant rate since Pagel’s lambda model provided a better fit to the mid-point of the altitudinal distribution data. Besides, phylogenetic regression analysis indicated that body mass and the altitudinal range of hummingbirds are associated through the phylogeny, with a positive but slight association (R2= 0.036). Conclusions: We found that body mass and altitude of hummingbirds are positively related, which is in agreement with expectations under Bergmann’s rule. However, this association was weaker than expected for small and non-passerine birds like hummingbirds. Thus, our results suggest that environmental changes across altitudinal gradients do not strongly influence body mass in small tropical endotherms as hummingbirds.
dc.formattext/html
dc.languageen
dc.publisherUniversidad de Costa Rica
dc.relation10.15517/rbt.v68i4.41139
dc.rightsinfo:eu-repo/semantics/openAccess
dc.sourceRevista de Biología Tropical v.68 n.4 2020
dc.subjectBergmann’s rule
dc.subjecthummingbirds
dc.subjectbody mass
dc.subjectelevational ranges
dc.subjectphylogenetic signal
dc.subjectnon-passerine birds
dc.subjectevolutionary models
dc.titleElevation does not strongly influence interspecific variation in body size of small Tropical endotherms
dc.typeinfo:eu-repo/semantics/article


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