| population history of berthelot's pipit: colonization, gene flow and morphological divergence in macaronesia. | the fauna of oceanic islands provide exceptional models with which to examine patterns of dispersal, isolation and diversification, from incipient speciation to species level radiations. here, we investigate recent differentiation and microevolutionary change in berthelot's pipit (anthus berthelotii), an endemic bird species inhabiting three atlantic archipelagos. mitochondrial dna sequence data and microsatellite markers were used to deduce probable colonization pathway, genetic differentiation ... | 2007 | 17908210 |
| genetic characterization, distribution and prevalence of avian pox and avian malaria in the berthelot's pipit (anthus berthelotii) in macaronesia. | exotic pathogens have been implicated in the decline and extinction of various native-island-bird species. despite the fact that there is increasing concern about the introduction of diseases in island ecosystems, little is known about parasites in the islands of macaronesia. we focus on berthelot's pipit (anthus berthelotii), an endemic and widespread macaronesian bird species, using a combination of field studies and molecular techniques to determine: (1) the range and prevalence of avian pox ... | 2008 | 18762985 |
| successful eradication of the european rabbit (oryctolagus cuniculus) and house mouse (mus musculus) from the island of selvagem grande (macaronesian archipelago), in the eastern atlantic. | the portuguese island of selvagem grande (great salvage) in macaronesia is an important seabird breeding station in the eastern atlantic. significant populations of cory's shearwater calonectris diomedea (scopoli, 1769), bulwer's petrel bulweria bulweria (jardine & selby, 1828) and little shearwater puffinus assimilis baroli (bonaparte, 1857) are present, and white-faced storm-petrel pelagodroma marina (latham, 1790) and madeiran storm-petrel oceanodroma castro (harcourt, 1851) populations are o ... | 2010 | 21392324 |
| biogeographical patterns and co-occurrence of pathogenic infection across island populations of berthelot's pipit (anthus berthelotii). | pathogens can exert strong selective forces upon host populations. however, before we can make any predictions about the consequences of pathogen-mediated selection, we first need to determine whether patterns of pathogen distribution are consistent over spatiotemporal scales. we used molecular techniques to screen for a variety of blood pathogens (avian malaria, pox and trypanosomes) over a three-year time period across 13 island populations of the berthelot's pipit (anthus berthelotii). this s ... | 2011 | 21983713 |
| landscape-scale variation in an anthropogenic factor shapes immune gene variation within a wild population. | understanding the spatial scale at which selection acts upon adaptive genetic variation in natural populations is fundamental to our understanding of evolutionary ecology, and has important ramifications for conservation. the environmental factors to which individuals of a population are exposed can vary at fine spatial scales, potentially generating localized patterns of adaptation. here, we compared patterns of neutral and major histocompatibility complex (mhc) variation within an island popul ... | 2016 | 27411090 |
| drift, not selection, shapes toll-like receptor variation among oceanic island populations. | understanding the relative role of different evolutionary forces in shaping the level and distribution of functional genetic diversity among natural populations is a key issue in evolutionary and conservation biology. to do so accurately genetic data must be analysed in conjunction with an unambiguous understanding of the historical processes that have acted upon the populations. here, we focused on diversity at toll-like receptor (tlr) loci, which play a key role in the vertebrate innate immune ... | 2015 | 26509790 |
| 454 screening of individual mhc variation in an endemic island passerine. | genes of the major histocompatibility complex (mhc) code for receptors that are central to the adaptive immune response of vertebrates. these genes are therefore important genetic markers with which to study adaptive genetic variation in the wild. next-generation sequencing (ngs) has increasingly been used in the last decade to genotype the mhc. however, ngs methods are highly prone to sequencing errors, and although several methodologies have been proposed to deal with this, until recently ther ... | 2015 | 25515684 |
| predictors of malaria infection in a wild bird population: landscape-level analyses reveal climatic and anthropogenic factors. | how the environment influences the transmission and prevalence of disease in a population of hosts is a key aspect of disease ecology. the role that environmental factors play in host-pathogen systems has been well studied at large scales, that is, differences in pathogen pressures among separate populations of hosts or across land masses. however, despite considerable understanding of how environmental conditions vary at fine spatial scales, the effect of these parameters on host-pathogen dynam ... | 2014 | 24527958 |
| genetic and phenotypic divergence in an island bird: isolation by distance, by colonization or by adaptation? | discerning the relative roles of adaptive and nonadaptive processes in generating differences among populations and species, as well as how these processes interact, is a fundamental aim in biology. both genetic and phenotypic divergence across populations can be the product of limited dispersal and gradual genetic drift across populations (isolation by distance), of colonization history and founder effects (isolation by colonization) or of adaptation to different environments preventing migrati ... | 2014 | 24447303 |
| type specimens of anthus berthelotii bolle, 1862 (aves: motacillidae). | | 2013 | 26312360 |
| microsatellite resources for passeridae species: a predicted microsatellite map of the house sparrow passer domesticus. | we identified microsatellite sequences of potential utility in the house sparrow (passer domesticus) and assigned their predicted genome locations. these sequences included newly isolated house sparrow loci, which we fully characterized. many of the newly isolated loci were polymorphic in two other species of passeridae: berthelot's pipit anthus berthelotii and zebra finch taeniopygia guttata. in total, we identified 179 microsatellite markers that were either isolated directly from, or are of k ... | 2012 | 22321340 |
| gene conversion rapidly generates major histocompatibility complex diversity in recently founded bird populations. | population bottlenecks can restrict variation at functional genes, reducing the ability of populations to adapt to new and changing environments. understanding how populations generate adaptive genetic variation following bottlenecks is therefore central to evolutionary biology. genes of the major histocompatibility complex (mhc) are ideal models for studying adaptive genetic variation due to their central role in pathogen recognition. while de novo mhc sequence variation is generated by point m ... | 2011 | 22106868 |
| adaptive landscape genetics and malaria across divergent island bird populations. | environmental conditions play a major role in shaping the spatial distributions of pathogens, which in turn can drive local adaptation and divergence in host genetic diversity. haemosporidians, such as plasmodium (malaria), are a strong selective force, impacting survival and fitness of hosts, with geographic distributions largely determined by habitat suitability for their insect vectors. here, we have tested whether patterns of fine-scale local adaptation to malaria are replicated across discr ... | 2019 | 31788192 |
| genomic associations with bill length and disease reveal drift and selection across island bird populations. | island species provide excellent models for investigating how selection and drift operate in wild populations, and for determining how these processes act to influence local adaptation and speciation. here, we examine the role of selection and drift in shaping genomic and phenotypic variation across recently separated populations of berthelot's pipit (anthus berthelotii), a passerine bird endemic to three archipelagos in the atlantic. we first characterized genetic diversity and population struc ... | 2018 | 30283662 |