Introgressive hybridization: brown bears as vectors for polar bear alleles.


:The dynamics and consequences of introgression can inform about numerous evolutionary processes. Biologists have therefore long been interested in hybridization. One challenge, however, lies in the identification of nonadmixed genotypes that can serve as a baseline for accurate quantification of admixture. In this issue of Molecular Ecology, Cahill et al. (2015) analyse a genomic data set of 28 polar bears, eight brown bears and one American black bear. Polar bear alleles are found to be introgressed into brown bears not only near a previously identified admixture zone on the Alaskan Admiralty, Baranof and Chichagof (ABC) Islands, but also far into the North American mainland. Elegantly contrasting admixture levels at autosomal and X chromosomal markers, Cahill and colleagues infer that male-biased dispersal has spread these introgressed alleles away from the Late Pleistocene contact zone. Compared to a previous study on the ABC Island population in which an Alaskan brown bear served as a putatively admixture-free reference, Cahill et al. (2015) utilize a newly sequenced Swedish brown bear as admixture baseline. This approach reveals that brown bears have been impacted by introgression from polar bears to a larger extent (up to 8.8% of their genome), than previously known, including the bear that had previously served as admixture baseline. No evidence for introgression of brown bear into polar bear is found, which the authors argue could be a consequence of selection. Besides adding new exciting pieces to the puzzle of polar/brown bear evolutionary history, the study by Cahill and colleagues highlights that wildlife genomics is moving from analysing single genomes towards a landscape genomics approach.


Mol Ecol


Molecular ecology


Hailer F




Has Abstract


2015-03-01 00:00:00












  • Multilocus sequence typing suggests the chytrid pathogen of amphibians is a recently emerged clone.

    abstract::Chytridiomycosis is a recently identified fungal disease associated with global population declines of frogs. Although the fungus, Batrachochytrium dendrobatidis, is considered an emerging pathogen, little is known about its population genetics, including the origin of the current epidemic and how this relates to the ...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Morehouse EA,James TY,Ganley AR,Vilgalys R,Berger L,Murphy PJ,Longcore JE

    更新日期:2003-02-01 00:00:00

  • Chloroplast DNA haplotype variation and population differentiation in Sorbus aucuparia L. (Rosaceae: Maloideae).

    abstract::Intra-specific chloroplast DNA (cpDNA) variation was studied in Sorbus aucuparia L., an entomophilous, mid-or early successional tree producing fleshy fruits. Eight PCR-amplified fragments of the chloroplast genome were screened for restriction fragment length polymorphisms, using one or two 4 bp-cutter restriction en...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Raspé O,Saumitou-Laprade P,Cuguen J,Jacquemart AL

    更新日期:2000-08-01 00:00:00

  • Comparison of population genetic patterns in two widespread freshwater mussels with contrasting life histories in western North America.

    abstract::We investigate population genetic structuring in Margaritifera falcata, a freshwater mussel native to western North America, across the majority of its geographical range. We find shallow rangewide genetic structure, strong population-level structuring and very low population diversity in this species, using both mito...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Mock KE,Brim Box JC,Chong JP,Furnish J,Howard JK

    更新日期:2013-12-01 00:00:00

  • The ectomycorrhizal fungus Amanita phalloides was introduced and is expanding its range on the west coast of North America.

    abstract::The deadly poisonous Amanita phalloides is common along the west coast of North America. Death cap mushrooms are especially abundant in habitats around the San Francisco Bay, California, but the species grows as far south as Los Angeles County and north to Vancouver Island, Canada. At different times, various authors ...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Pringle A,Adams RI,Cross HB,Bruns TD

    更新日期:2009-03-01 00:00:00

  • Quantitative polymerase chain reaction analysis of DNA from noninvasive samples for accurate microsatellite genotyping of wild chimpanzees (Pan troglodytes verus).

    abstract::Noninvasive samples are useful for molecular genetic analyses of wild animal populations. However, the low DNA content of such samples makes DNA amplification difficult, and there is the potential for erroneous results when one of two alleles at heterozygous microsatellite loci fails to be amplified. In this study we ...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Morin PA,Chambers KE,Boesch C,Vigilant L

    更新日期:2001-07-01 00:00:00

  • A 6.5-kb intergenic structural variation enhances P450-mediated resistance to pyrethroids in malaria vectors lowering bed net efficacy.

    abstract::Elucidating the complex evolutionary armory that mosquitoes deploy against insecticides is crucial to maintain the effectiveness of insecticide-based interventions. Here, we deciphered the role of a 6.5-kb structural variation (SV) in driving cytochrome P450-mediated pyrethroid resistance in the malaria vector, Anophe...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Mugenzi LMJ,Menze BD,Tchouakui M,Wondji MJ,Irving H,Tchoupo M,Hearn J,Weedall GD,Riveron JM,Cho-Ngwa F,Wondji CS

    更新日期:2020-11-01 00:00:00

  • Adaptation with gene flow across the landscape in a dune sunflower.

    abstract::Isolation by adaptation increases divergence at neutral loci when natural selection against immigrants reduces the rate of gene flow between different habitats. This can occur early in the process of adaptive divergence and is a key feature of ecological speciation. Despite the ability of isolation by distance (IBD) a...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Andrew RL,Ostevik KL,Ebert DP,Rieseberg LH

    更新日期:2012-05-01 00:00:00

  • Using multilevel models to identify drivers of landscape-genetic structure among management areas.

    abstract::Landscape genetics offers a powerful approach to understanding species' dispersal patterns. However, a central obstacle is to account for ecological processes operating at multiple spatial scales, while keeping research outcomes applicable to conservation management. We address this challenge by applying a novel multi...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Dudaniec RY,Rhodes JR,Worthington Wilmer J,Lyons M,Lee KE,McAlpine CA,Carrick FN

    更新日期:2013-07-01 00:00:00

  • Chloroplast microsatellites and mitochondrial nad1 intron 2 sequences indicate congruent phylogenetic relationships among Swiss stone pine (Pinus cembra), Siberian stone pine (Pinus sibirica), and Siberian dwarf pine (Pinus pumila).

    abstract::We studied the phylogenetic relationships among the three stone pine species, Pinus cembra, P. sibirica, and P. pumila, using chloroplast microsatellites and mitochondrial nad1 intron 2 sequences. The three chloroplast microsatellite loci combined into a total of 18 haplotypes. Fourteen haplotypes were detected in 15 ...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Gugerli F,Senn J,Anzidei M,Madaghiele A,Büchler U,Sperisen C,Vendramin GG

    更新日期:2001-06-01 00:00:00

  • Back to nature: ecological genomics of loblolly pine (Pinus taeda, Pinaceae).

    abstract::Genetic variation is often arrayed in latitudinal or altitudinal clines, reflecting either adaptation along environmental gradients, migratory routes, or both. For forest trees, climate is one of the most important drivers of adaptive phenotypic traits. Correlations of single and multilocus genotypes with environmenta...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Eckert AJ,Bower AD,González-Martínez SC,Wegrzyn JL,Coop G,Neale DB

    更新日期:2010-09-01 00:00:00

  • Do genetic drift and accumulation of deleterious mutations preclude adaptation? Empirical investigation using RADseq in a northern lacustrine fish.

    abstract::Understanding genomic signatures of divergent selection underlying long-term adaptation in populations located in heterogeneous environments is a key goal in evolutionary biology. In this study, we investigated neutral, adaptive and deleterious genetic variation using 7,192 SNPs in 31 Lake Trout (Salvelinus namaycush)...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Perrier C,Ferchaud AL,Sirois P,Thibault I,Bernatchez L

    更新日期:2017-11-01 00:00:00

  • Assessment of spatial discordance of primary and effective seed dispersal of European beech (Fagus sylvatica L.) by ecological and genetic methods.

    abstract::Spatial discordance between primary and effective dispersal in plant populations indicates that postdispersal processes erase the seed rain signal in recruitment patterns. Five different models were used to test the spatial concordance of the primary and effective dispersal patterns in a European beech (Fagus sylvatic...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Millerón M,López de Heredia U,Lorenzo Z,Alonso J,Dounavi A,Gil L,Nanos N

    更新日期:2013-03-01 00:00:00

  • Phylogenetics support an ancient common origin of two scientific icons: Devils Hole and Devils Hole pupfish.

    abstract::The Devils Hole pupfish (Cyprinodon diabolis; DHP) is an icon of conservation biology. Isolated in a 50 m(2) pool (Devils Hole), DHP is one of the rarest vertebrate species known and an evolutionary anomaly, having survived in complete isolation for thousands of years. However, recent findings suggest DHP might be you...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Sağlam İK,Baumsteiger J,Smith MJ,Linares-Casenave J,Nichols AL,O'Rourke SM,Miller MR

    更新日期:2016-08-01 00:00:00

  • Microsatellite analysis of demographic genetic structure in fragmented populations of the tropical tree Symphonia globulifera.

    abstract::We developed genetic markers for three microsatellite loci in the tropical tree Symphonia globulifera and used them to examine the demographic genetic consequences of forest fragmentation. High levels of genetic variation were revealed in samples of adults, saplings, and seedlings. The more-variable loci exhibited les...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Aldrich PR,Hamrick JL,Chavarriaga P,Kochert G

    更新日期:1998-08-01 00:00:00

  • Patterns of DNA sequence diversity and genetic structure after a range expansion: lessons from the infinite-island model.

    abstract::It has been long recognized that population demographic expansions lead to distinctive features in the molecular diversity of populations. However, recent simulation results have suggested that a distinction could be made between a pure demographic expansion in an unsubdivided population, and a range expansion in a su...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Excoffier L

    更新日期:2004-04-01 00:00:00

  • Phylogenetic divergence of island biotas: Molecular dates, extinction, and "relict" lineages.

    abstract::Island formation is a key driver of biological evolution, and several studies have used geological ages of islands to calibrate rates of DNA change. However, many islands are home to "relict" lineages whose divergence apparently pre-dates island age. The geologically dynamic New Zealand (NZ) archipelago sits upon the ...

    journal_title:Molecular ecology

    pub_type: 杂志文章,评审


    authors: McCulloch GA,Waters JM

    更新日期:2019-10-01 00:00:00

  • Cryptic invasions of the crab Carcinus detected by molecular phylogeography.

    abstract::Coastal marine ecosystems world-wide are threatened by invasions of nonindigenous species. The ubiquity of marine sibling species identifiable only by genetic analysis suggests that many invasions are cryptic and therefore undetected, causing an underestimation of the actual number and impacts of invading species. We ...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Geller JB,Walton ED,Grosholz ED,Ruiz GM

    更新日期:1997-10-01 00:00:00

  • Conservation genomics of Atlantic salmon: variation in gene expression between and within regions of the Bay of Fundy.

    abstract::Due to difficulties in identifying important within-species biodiversity for effective species management and conservation, the use of multiple complementary sources of information is required to identify and assess the designation of conservation units based on the degree of variation among populations within a speci...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Vandersteen Tymchuk W,O'Reilly P,Bittman J,Macdonald D,Schulte P

    更新日期:2010-05-01 00:00:00

  • Assessing niche partitioning of co-occurring sibling bat species by DNA metabarcoding.

    abstract::Niche partitioning through foraging is a mechanism likely involved in facilitating the coexistence of ecologically similar and co-occurring animal species by separating their use of resources. Yet, this mechanism is not well understood in flying insectivorous animals. This is particularly true of bats, where many ecol...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Arrizabalaga-Escudero A,Clare EL,Salsamendi E,Alberdi A,Garin I,Aihartza J,Goiti U

    更新日期:2018-03-01 00:00:00

  • The role of tropical dry forest as a long-term barrier to dispersal: a comparative phylogeographical analysis of dry forest tolerant and intolerant frogs.

    abstract::We used a comparative phylogeographical approach to investigate the origins of the disjunct wet forest biota of the Golfo Dulce region along the Pacific slope of Costa Rica. This region is isolated by Pacific dry forests north and south and isolated from Caribbean wet forests by mountains. We studied three sympatric l...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Crawford AJ,Bermingham E,Carolina PS

    更新日期:2007-11-01 00:00:00

  • These aren't the loci you'e looking for: Principles of effective SNP filtering for molecular ecologists.

    abstract::Sequencing reduced-representation libraries of restriction site-associated DNA (RADseq) to identify single nucleotide polymorphisms (SNPs) is quickly becoming a standard methodology for molecular ecologists. Because of the scale of RADseq data sets, putative loci cannot be assessed individually, making the process of ...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: O'Leary SJ,Puritz JB,Willis SC,Hollenbeck CM,Portnoy DS

    更新日期:2018-07-10 00:00:00

  • Phylogeography of the sergeants Abudefduf sexfasciatus and A. vaigiensis reveals complex introgression patterns between two widespread and sympatric Indo-West Pacific reef fishes.

    abstract::On evolutionary timescales, sea level oscillations lead to recurrent spatio-temporal variation in species distribution and population connectivity. In this situation, applying classical concepts of biogeography is challenging yet necessary to understand the mechanisms underlying biodiversity in highly diverse marine e...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Bertrand JAM,Borsa P,Chen WJ

    更新日期:2017-05-01 00:00:00

  • Experimentally altered rainfall regimes and host root traits affect grassland arbuscular mycorrhizal fungal communities.

    abstract::Future climate scenarios predict changes in rainfall regimes. These changes are expected to affect plants via effects on the expression of root traits associated with water and nutrient uptake. Associated microorganisms may also respond to these new precipitation regimes, either directly in response to changes in the ...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Deveautour C,Donn S,Power SA,Bennett AE,Powell JR

    更新日期:2018-04-01 00:00:00

  • Multiple paternity and competition in sympatric congeneric reef fishes, Embiotoca jacksoni and E. lateralis.

    abstract::The black surfperch Embiotoca jacksoni and the striped surfperch E. lateralis (Embiotocidae, Perciformes) are livebearing temperate reef fishes that live sympatrically over a large portion of their distribution range, where they exhibit strong ecological competition. In order to assess whether mating strategies reflec...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Reisser CM,Beldade R,Bernardi G

    更新日期:2009-04-01 00:00:00

  • Low genetic differentiation among seasonal cohorts in Senecio vulgaris as revealed by amplified fragment length polymorphism analysis.

    abstract::Common groundsel, Senecio vulgaris (Asteraceae), is a highly selfing semelparous ephemeral weed that belongs to the few plant species in central Europe capable of growing, flowering and fruiting all year round. In temperate climates, flowering S. vulgaris cohorts were found to appear up to three times per year. Using ...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Haldimann P,Steinger T,Müller-Schärer H

    更新日期:2003-10-01 00:00:00

  • SNP analyses reveal a diverse pool of potential colonists to earthquake-uplifted coastlines.

    abstract::In species that form dense populations, major disturbance events are expected to increase the chance of establishment for immigrant lineages. Real-time tests of the impact of disturbance on patterns of genetic structure are, however, scarce. Central to testing these concepts is determining the pool of potential immigr...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Peters JC,Waters JM,Dutoit L,Fraser CI

    更新日期:2020-01-01 00:00:00

  • Reproductive workers show queenlike gene expression in an intermediately eusocial insect, the buff-tailed bumble bee Bombus terrestris.

    abstract::Bumble bees represent a taxon with an intermediate level of eusociality within Hymenoptera. The clear division of reproduction between a single founding queen and the largely sterile workers is characteristic for highly eusocial species, whereas the morphological similarity between the bumble bee queen and the workers...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Harrison MC,Hammond RL,Mallon EB

    更新日期:2015-06-01 00:00:00

  • Multiple scales of genetic connectivity in a brooding coral on isolated reefs following catastrophic bleaching.

    abstract::Understanding the pattern of connectivity among populations is crucial for the development of realistic and spatially explicit population models in marine systems. Here we analysed variation at eight microsatellite loci to assess the genetic structure and to infer patterns of larval dispersal for a brooding coral, Ser...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Underwood JN,Smith LD,Van Oppen MJ,Gilmour JP

    更新日期:2007-02-01 00:00:00

  • Genomic atolls of differentiation in coral reef fishes (Hypoplectrus spp., Serranidae).

    abstract::Because the vast majority of species are well diverged, relatively little is known about the genomic architecture of speciation during the early stages of divergence. Species within recent evolutionary radiations are often minimally diverged from a genomic perspective, and therefore provide rare opportunities to addre...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Puebla O,Bermingham E,McMillan WO

    更新日期:2014-11-01 00:00:00

  • Migration-related phenotypic divergence is associated with epigenetic modifications in rainbow trout.

    abstract::Migration is essential for the reproduction and survival of many animals, yet little is understood about its underlying molecular mechanisms. We used the salmonid Oncorhynchus mykiss to gain mechanistic insight into smoltification, which is a morphological, physiological and behavioural transition undertaken by juveni...

    journal_title:Molecular ecology

    pub_type: 杂志文章


    authors: Baerwald MR,Meek MH,Stephens MR,Nagarajan RP,Goodbla AM,Tomalty KMH,Thorgaard GH,May B,Nichols KM

    更新日期:2016-04-01 00:00:00