| five new species of the feather mite genus trouessartia canestrini from south america (acari: trouessartiidae). | five new feather mite species of the genus trouessartia canestrini are described from south american birds: trouessartia latiducta sp. nov. from phylloscartes kronei (tyrannidae), t. basileuteri sp. nov. from basileuterus culicivorus (parulidae), t. sicaliae sp. nov. from sicalis flaveola (emberizidae), t. savanae sp. nov. from tyrannus savana (tyrannidae), and t. picumni from picumnus fulvescens (picidae). the latter species is the first representative of the genus described from a bird of the ... | 2014 | 25284645 |
| sonations in migratory and non-migratory fork-tailed flycatchers (tyrannus savana). | sonations are sounds that animals produce with structures other than the vocal apparatus for communication. in birds, many sonations are usually produced with modified flight feathers through diverse kinematic mechanisms. for instance, aeroelastic fluttering of feathers produces tonal sound when airflow exceeds a threshold velocity and induces flight feathers to oscillate at a constant frequency. the fork-tailed flycatcher (tyrannus savana) is a neotropical bird with both migratory and year-roun ... | 2020 | 32777043 |
| speciation associated with shifts in migratory behavior in an avian radiation. | migratory animals move up to thousands of kilometers every year [1]. losses of migration (i.e., migratory drop-offs) occur when individuals of a migratory species stop migrating and establish founder sedentary populations, a phenomenon documented in birds [2-5] and butterflies [6]. in theory, losses-and also gains-of migration might promote speciation if sedentary and migratory populations become reproductively isolated [7-9]. because migratory and sedentary strategies involve alternative physio ... | 2020 | 32197080 |
| breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in south america. | identifying the processes that determine avian migratory strategies in different environmental contexts is imperative to understanding the constraints to survival and reproduction faced by migratory birds across the planet.we compared the spring migration strategies of fork-tailed flycatchers (tyrannus s. savana) that breed at south-temperate latitudes (i.e., austral migrants) vs. tropical latitudes (i.e., intratropical migrants) in south america. we hypothesized that austral migrant flycatchers ... | 2019 | 31160996 |