prevalence of blood parasites in tyrannidae (flycatchers) in the eastern plains of colombia.blood samples from 159 birds of the new-world family tyrannidae (the flycatchers) from the eastern plains of colombia, were examined for haematozoa parasites, in 1999-2000. haematozoa were detected in six of 20 species. the overall prevalence was 10.1%. the most common parasites detected were microfilariae, followed by trypanosoma and plasmodium. the highest prevalence (9.6%) was found in the ochre-bellied flycatcher (mionectes oleaginea). mixed infections with more than one genus of blood paras ...200415273798
patterns of movement and seed dispersal of a tropical frugivore.movement is a fundamental feature of vertebrate behavior and can modify processes within populations and communities. because tropical avian frugivores disperse seeds of many plant species, the temporal and spatial patterning of their movement will influence seed distribution within a habitat. to date, little is known about movement patterns of these birds. here we consider the movement of an understory frugivore, mionectes oleagineus. movements of 16 non-breeding females were monitored using co ...200028308379
out of amazonia again and again: episodic crossing of the andes promotes diversification in a lowland forest flycatcher.most neotropical lowland forest taxa occur exclusively on one side of the andes despite the availability of appropriate habitat on both sides. almost all molecular phylogenies and phylogenetic analyses of species assemblages (i.e. area cladograms) have supported the hypothesis that andean uplift during the late pliocene created a vicariant barrier affecting lowland lineages in the region. however, a few widespread plant and animal species occurring in lowland forests on both sides of the andes c ...200818285279
mitochondrial genome organization of the ochre-bellied flycatcher, mionectes oleagineus.we sequenced and compared the mitogenome organization of two specimens of suboscine tyrant flycatcher mionectes oleagineus from western and eastern panama, representing distinct mtdna clades. these samples show identical gene arrangement and vary in size by less than 5 base pairs. both depict a non-standard avian gene order with an extra non-coding region (e.g. the remnant cr2), which differs in one base pair between them. small size differences are also found on the control region and the 16s r ...201624857375
androgens regulate gene expression in avian skeletal muscles.circulating androgens in adult reproductively active male vertebrates influence a diversity of organ systems and thus are considered costly. recently, we obtained evidence that androgen receptors (ar) are expressed in several skeletal muscles of three passeriform birds, the golden-collared manakin (manacus vitellinus), zebra finch (taenopygia guttata), and ochre-bellied flycatcher (mionectes oleagieus). because skeletal muscles that control wing movement make up the bulk of a bird's body mass, e ...201223284699
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