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Pàgina 1 des de 30 resultats
The oldest European fossil songbird from the early Oligocene of Germany.
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We report on the oldest European songbird (Passeriformes), from the early Oligocene (30-34 million years ago) of Frauenweiler in Germany. The specimen represents the earliest associated remains of an early Tertiary passerine described so far. It ties the first appearance of Passeriformes in Europe
De-novo emergence of SINE retroposons during the early evolution of passerine birds.
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Passeriformes ("perching birds" or passerines) make up more than half of all extant bird species. The genome of the zebra finch, a passerine model organism for vocal learning, was noted previously to contain thousands of short interspersed elements (SINEs), a group of retroposons that is
The chicken immediate-early gene ZENK is expressed in the medio-rostral neostriatum/hyperstriatum ventrale, a brain region involved in acoustic imprinting, and is up-regulated after exposure to an auditory stimulus.
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The immediate-early gene zenk (an acronym for the avian orthologue of the mammalian genes zif-268, egr-1, ngfi-a and krox-24) has been extensively employed, in studies on oscine birds, as a marker of neuronal activity to reveal forebrain structures that are involved in the memory processes
A Paleogene origin for crown passerines and the diversification of the Oscines in the New World.
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In this study, we present a detailed family-level phylogenetic hypothesis for the largest avian order (Aves: Passeriformes) and an unmatched multi-calibrated, relaxed clock inference for the diversification of crown passerines. Extended taxon sampling allowed the recovery of many challenging clades
Tectonic collision and uplift of Wallacea triggered the global songbird radiation.
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Songbirds (oscine passerines) are the most species-rich and cosmopolitan bird group, comprising almost half of global avian diversity. Songbirds originated in Australia, but the evolutionary trajectory from a single species in an isolated continent to worldwide proliferation is poorly understood.
Localized neuronal activation in the zebra finch brain is related to the strength of song learning.
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Songbirds (Oscines) learn their songs from a tutor. It is not known where in the brain the memories of these learned sounds are stored. Recent evidence suggests that song perception in songbirds involves neuronal activation in brain regions that have not traditionally been implicated in the control
African endemics span the tree of songbirds (Passeri): molecular systematics of several evolutionary 'enigmas'.
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The deep divergence between the African endemic passerines Picathartidae (rockfowl Picathartes and rockjumpers Chaetops, four species) and the Passerida (ca. 3500 species) suggests an older history of oscines on the African continent than has previously been assumed. In order to determine whether
Birdsong signals individual diversity at the major histocompatibility complex.
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The major histocompatibility complex (MHC) plays a key role in vertebrate immunity, and pathogen-mediated selection often favours certain allelic combinations. Assessing potential mates' MHC profiles may provide receivers with genetic benefits (identifying MHC-compatible mates and producing
An unbiased molecular approach using 3'UTRs resolves the avian family-level tree of life
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Presumably, due to a rapid early diversification, major parts of the higher-level phylogeny of birds are still resolved controversially in different analyses or are considered unresolvable. To address this problem, we produced an avian tree of life, which includes molecular sequences of one or
Sexual dimorphisms in the neural vocal control system in song birds: ontogeny and phylogeny.
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Sex differences in the neural song system in oscine song birds develop in response to estradiol secreted during early periods of development. Estradiol produces sex differences in cell number and in the proportion of cells which are steroid targets. The pattern of development of these sex
A Gondwanan origin of passerine birds supported by DNA sequences of the endemic New Zealand wrens.
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Zoogeographic, palaeontological and biochemical data support a Southern Hemisphere origin for passerine birds, while accumulating molecular data suggest that most extant avian orders originated in the mid-Late Cretaceous. We obtained DNA sequence data from the nuclear c-myc and RAG-1 genes of the
New Zealand Passerines Help Clarify the Diversification of Major Songbird Lineages during the Oligocene.
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Passerines are the largest avian order, and the 6,000 species comprise more than half of all extant bird species. This successful radiation probably had its origin in the Australasian region, but dating this origin has been difficult due to a scarce fossil record and poor biogeographic assumptions.
Phylogeny and diversification of the largest avian radiation.
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The order Passeriformes ("perching birds") comprises extant species diversity comparable to that of living mammals. For over a decade, a single phylogenetic hypothesis based on DNA-DNA hybridization has provided the primary framework for numerous comparative analyses of passerine ecological and
Sexual equality in zebra finch song preference: evidence for a dissociation between song recognition and production learning.
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Song in oscine birds is a culturally inherited mating signal and sexually dimorphic. From differences in song production learning, sex differences in song recognition learning have been inferred but rarely put to a stringent test. In zebra finches, Taeniopygia guttata, females never sing and the
The structure of an avian syllable syntax network.
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A common result in recent linguistic studies on word association networks is that their topology can often be described by Zipf's law, in which most words have few associations, whereas a few words are highly connected. However, little is known about syntactic networks in more rudimentary
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