77 results match your criteria varied allopatric

Microdiversity and phylogeographic diversification of bacterioplankton in pelagic freshwater systems revealed through long-read amplicon sequencing.

Microbiome 2021 01 22;9(1):24. Epub 2021 Jan 22.

Center for Ecological Research, Kyoto University, 2-509-3 Hirano, Otsu, Shiga, 520-2113, Japan.

Background: Freshwater ecosystems are inhabited by members of cosmopolitan bacterioplankton lineages despite the disconnected nature of these habitats. The lineages are delineated based on > 97% 16S rRNA gene sequence similarity, but their intra-lineage microdiversity and phylogeography, which are key to understanding the eco-evolutional processes behind their ubiquity, remain unresolved. Here, we applied long-read amplicon sequencing targeting nearly full-length 16S rRNA genes and the adjacent ribosomal internal transcribed spacer sequences to reveal the intra-lineage diversities of pelagic bacterioplankton assemblages in 11 deep freshwater lakes in Japan and Europe. Read More

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January 2021

The cost of travel: How dispersal ability limits local adaptation in host-parasite interactions.

J Evol Biol 2021 Mar 29;34(3):512-524. Epub 2020 Dec 29.

Department of Chemistry and Biology, Ryerson University, Toronto, ON, Canada.

Classical theory suggests that parasites will exhibit higher fitness in sympatric relative to allopatric host populations (local adaptation). However, evidence for local adaptation in natural host-parasite systems is often equivocal, emphasizing the need for infection experiments conducted over realistic geographic scales and comparisons among species with varied life history traits. Here, we used infection experiments to test how two trematode (flatworm) species (Paralechriorchis syntomentera and Ribeiroia ondatrae) with differing dispersal abilities varied in the strength of local adaptation to their amphibian hosts. Read More

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Inter- and intra-archipelago dynamics of population structure and gene flow in a Polynesian bird.

Mol Phylogenet Evol 2021 03 1;156:107034. Epub 2020 Dec 1.

Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM, USA.

Islands are separated by natural barriers that prevent gene flow between terrestrial populations and promote allopatric diversification. Birds in the South Pacific are an excellent model to explore the interplay between isolation and gene flow due to the region's numerous archipelagos and well-characterized avian communities. The wattled honeyeater complex (Foulehaio spp. Read More

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Patterns of Sphaeridiotrema pseudoglobulus infection in sympatric and allopatric hosts (Bithynia tentaculata) originating from widely separated sites across the USA.

Parasitol Res 2021 Jan 11;120(1):187-195. Epub 2020 Nov 11.

River Studies Center, University of Wisconsin-La Crosse, 1725 State Street, La Crosse, WI, 54601, USA.

In circumstances where populations of invasive species occur across variable landscapes, interactions among invaders, their parasites, and the surrounding environment may establish local coevolutionary trajectories for the participants. This can generate variable infection patterns when parasites interact with sympatric versus allopatric hosts. Identifying the potential for such patterns within an invasive-species framework is important for better predicting local infection outcomes and their subsequent impacts on the surrounding native community. Read More

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January 2021

Seasonal and developmental diet shifts in sympatric and allopatric intertidal gobies determined by stomach content and stable isotope analysis.

J Fish Biol 2020 Oct 27;97(4):1051-1062. Epub 2020 Aug 27.

Department of Biological Sciences, Macquarie University, Sydney, Australia.

Resource partitioning facilitates the coexistence of sympatric species through spatial, temporal and/or trophic strategies. Fishes living in the intertidal zone demonstrate highly adaptive plastic behaviour, including resource partitioning, through spatial and temporal shifts in diet and microhabitat. Although intertidal fish assemblages are influenced by inter- and intraspecific competition, few studies have compared the extent of resource partitioning between sympatric species in the context of trophic niche plasticity. Read More

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October 2020

Impacts of local population history and ecology on the evolution of a globally dispersed pathogen.

BMC Genomics 2020 May 20;21(1):369. Epub 2020 May 20.

Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, USA.

Background: Pathogens with a global distribution face diverse biotic and abiotic conditions across populations. Moreover, the ecological and evolutionary history of each population is unique. Xylella fastidiosa is a xylem-dwelling bacterium infecting multiple plant hosts, often with detrimental effects. Read More

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Model eggs fail to detect egg recognition in host populations after brood parasitism is relaxed.

Front Zool 2020 12;17:14. Epub 2020 May 12.

1Ministry of Education Key Laboratory for Ecology of Tropical Islands, College of Life Sciences, Hainan Normal University, Haikou, 571158 China.

Background: Obligate brood parasites exert strong selective pressure on target hosts. In response, hosts typically evolve anti-parasitism strategies, of which egg recognition is one of the most efficient. Generally, host egg-recognition capacity is determined using model eggs. Read More

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Invasion, isolation and evolution shape population genetic structure in .

AoB Plants 2020 Apr 12;12(2):plaa011. Epub 2020 Mar 12.

UK Centre for Ecology & Hydrology, Penicuik, Midlothian, Scotland, UK.

The distribution and genetic structure of most plant species in Britain and Ireland bear the imprint of the last ice age. These patterns were largely shaped by random processes during recolonization but, in angiosperms, whole-genome duplication may also have been important. We investigate the distribution of cytotypes of , considering DNA variation, postglacial colonization, environmental partitioning and reproductive barriers. Read More

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Maintenance of Sympatric and Allopatric Populations in Free-Living Terrestrial Bacteria.

mBio 2019 10 29;10(5). Epub 2019 Oct 29.

Department of Ecology and Evolutionary Biology, University of California, Irvine, California, USA.

For free-living bacteria and archaea, the equivalent of the biological species concept does not exist, creating several obstacles to the study of the processes contributing to microbial diversification. These obstacles are particularly high in soil, where high bacterial diversity inhibits the study of closely related genotypes and therefore the factors structuring microbial populations. Here, we isolated strains within a single ecotype from surface soil (leaf litter) across a regional climate gradient and investigated the phylogenetic structure, recombination, and flexible gene content of this genomic diversity to infer patterns of gene flow. Read More

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October 2019

Genomic and phenotypic consequences of two independent secondary contact zones between allopatric lineages of the anadromous ice goby Leucopsarion petersii.

Heredity (Edinb) 2020 01 11;124(1):223-235. Epub 2019 Jun 11.

Fisheries Laboratory, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Hamamatsu, 431-0214, Shizuoka, Japan.

Genetic and phenotypic analyses of independent secondary contact zones between certain pairs of divergent populations offer powerful opportunities to assess whether the consequences vary with different environmental backgrounds. Populations of the ice goby Leucopsarion petersii are distributed throughout the Japanese archipelago and comprise genetically and phenotypically divergent groups in the Japan Sea and the Pacific Ocean. In particular, populations in the Japan Sea have a larger body size and numbers of vertebrae than those in the Pacific Ocean. Read More

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January 2020

Temperature-mediated phylogenetic assemblage of fungal communities and local adaptation in mycorrhizal symbioses.

Environ Microbiol Rep 2019 04 16;11(2):215-226. Epub 2019 Jan 16.

Key Laboratory of Soil Pollution Prevention and Remediation, Beijing, China.

Recent work demonstrates that habitat conditions exert striking effects on symbiont performance by mediating trade-offs in plants, AM fungi and environmental interactions. However, how local temperature conditions influence the functional diversity of mycorrhizal symbioses and the genetics of coexisting AM fungi at the local scale remain unclear. In the present study, we conducted a reciprocal inoculation experiment to explore the performance of sympatric associations against allopatric associations under contrasting temperatures and the AM fungal community in colonized roots. Read More

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Manipulating host resistance structure reveals impact of pathogen dispersal and environmental heterogeneity on epidemics.

Ecology 2018 12 19;99(12):2853-2863. Epub 2018 Nov 19.

Research Centre for Ecological Change, University of Helsinki, PO Box 65 (Viikinkaari 1), FI-00014, Helsinki, Finland.

Understanding how variation in hosts, parasites, and the environment shapes patterns of disease is key to predicting ecological and evolutionary outcomes of epidemics. Yet in spatially structured populations, variation in host resistance may be spatially confounded with variation in parasite dispersal and environmental factors that affect disease processes. To tease apart these disease drivers, we paired surveys of natural epidemics with experiments manipulating spatial variation in host susceptibility to infection. Read More

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December 2018

Natural hybridisation among Quercus glabrescens, Q. rugosa and Q. obtusata (Fagaceae): Microsatellites and secondary metabolites markers.

Plant Biol (Stuttg) 2019 Jan 22;21(1):110-121. Epub 2018 Sep 22.

Laboratorio de Marcadores Moleculares, Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México.

Natural hybridisation has significant ecological, genetic and evolutionary consequences altering morphological and chemical characters of individuals. Quercus glabrescens, Q. rugosa and Q. Read More

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January 2019

Genomic and geographic footprints of differential introgression between two divergent fish species (Solea spp.).

Heredity (Edinb) 2018 12 1;121(6):579-593. Epub 2018 May 1.

Université de Montpellier, Place Eugène Bataillon, 34095, Montpellier, France.

Investigating gene flow between closely related species and its variation across the genome is important to understand how reproductive barriers shape genome divergence before speciation is complete. An efficient way to characterize differential gene flow is to study how the genetic interactions that take place in hybrid zones selectively filter gene exchange between species, leading to heterogeneous genome divergence. In the present study, genome-wide divergence and introgression patterns were investigated between two sole species, Solea senegalensis and Solea aegyptiaca, using restriction-associated DNA sequencing (RAD-Seq) to analyze samples taken from a transect spanning the hybrid zone. Read More

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December 2018

Effect of spatial connectivity on host resistance in a highly fragmented natural pathosystem.

J Evol Biol 2018 06 10;31(6):844-852. Epub 2018 Apr 10.

Faculty of Environmental and Biological Sciences, University of Helsinki, Helsinki, Finland.

Both theory and experimental evolution studies predict migration to influence the outcome of antagonistic coevolution between hosts and their parasites, with higher migration rates leading to increased diversity and evolutionary potential. Migration rates are expected to vary in spatially structured natural pathosystems, yet how spatial structure generates variation in coevolutionary trajectories across populations occupying the same landscape has not been tested. Here, we studied the effect of spatial connectivity on host evolutionary potential in a natural pathosystem characterized by a stable Plantago lanceolata host network and a highly dynamic Podosphaera plantaginis parasite metapopulation. Read More

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Geographic variation in floral traits and the capacity of autonomous selfing across allopatric and sympatric populations of two closely related Centaurium species.

Sci Rep 2017 04 21;7:46410. Epub 2017 Apr 21.

KU Leuven, Department of Biology, Plant Conservation and Population Biology, B-3001 Leuven, Belgium.

Floral traits and the relative contribution of autonomous selfing to total seed set varies geographically and is often driven by the availability and abundance of suitable pollinators and/or the presence of co-flowering relatives. In the latter case, competition for pollinator services and costs of hybridization can select for floral traits that reduce interspecific gene flow and contribute to prezygotic isolation, potentially leading to geographic variation in floral divergence between allopatric and sympatric populations. In this study, we investigated variation in floral traits and its implications on the capacity of autonomous selfing in both allopatric and sympatric populations of two closely related Centaurium species(Gentianaceae) across two distinct geographic regions(UK and mainland Europe). Read More

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Sexual selection and population divergence II. Divergence in different sexual traits and signal modalities in field crickets (Teleogryllus oceanicus).

Evolution 2017 06 28;71(6):1614-1626. Epub 2017 Apr 28.

Centre for Biological Diversity, University of St Andrews, St. Andrews, KY16 9TH, United Kingdom.

Sexual selection can target many different types of traits. However, the relative influence of different sexually selected traits during evolutionary divergence is poorly understood. We used the field cricket Teleogryllus oceanicus to quantify and compare how five traits from each of three sexual signal modalities and components diverge among allopatric populations: male advertisement song, cuticular hydrocarbon (CHC) profiles and forewing morphology. Read More

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Ecological speciation of bacteriophage lambda in allopatry and sympatry.

Science 2016 Dec 24;354(6317):1301-1304. Epub 2016 Nov 24.

Department of Microbiology and Molecular Genetics and BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, MI 48824, USA.

Understanding the conditions that allow speciation to occur is difficult because most research has focused on either long-lived organisms or asexual microorganisms. We propagated bacteriophage λ, a virus with rapid generations and frequent recombination, on two Escherichia coli host genotypes that expressed either the LamB or OmpF receptor. When supplied with either single host (allopatry), phage λ improved its binding to the available receptor while losing its ability to use the alternative. Read More

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December 2016

Endocrine and metabolic impacts of warming aquatic habitats: differential responses between recently isolated populations of a eurythermal desert pupfish.

Conserv Physiol 2016 3;4(1):cow047. Epub 2016 Nov 3.

Biological Sciences Department , Center for Coastal Marine Sciences , California Polytechnic State University , San Luis Obispo , CA 93407 , USA.

Temperatures of inland aquatic habitats are increasing with climate change, and understanding how fishes respond physiologically to thermal stress will be crucial for identifying species most susceptible to these changes. Desert fishes may be particularly vulnerable to rising temperatures because many species occupy only a fraction of their historical range and occur in habitats with already high temperatures. Here, we examined endocrine and metabolic responses to elevated temperature in Amargosa pupfish, . Read More

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November 2016

Linking morphometric and genetic divergence with host use in the tick complex, Ornithodoros capensis sensu lato.

Infect Genet Evol 2016 12 10;46:12-22. Epub 2016 Oct 10.

MIVEGEC UMR 5290 CNRS-IRD-UM, Centre IRD, 911 Avenue Agropolis, BP 64501, 34394 Montpellier, France.

Host specific adaptations in parasites can lead to the divergence of conspecific populations. However, this divergence can be difficult to measure because morphological changes may not be expressed or because obvious changes may simply reflect phenotypic plasticity. Combining both genetic and phenotypic information can enable a better understanding of the divergence process and help identify the underlying selective forces, particularly in closely-related species groups. Read More

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December 2016

Extensive variation, but not local adaptation in an Australian alpine daisy.

Ecol Evol 2016 08 10;6(15):5459-72. Epub 2016 Jul 10.

Bio21 Institute School of Biosciences The University of Melbourne Parkville Victoria 3010 Australia.

Alpine plants often occupy diverse habitats within a similar elevation range, but most research on local adaptation in these plants has focused on elevation gradients. In testing for habitat-related local adaptation, local effects on seed quality and initial plant growth should be considered in designs that encompass multiple populations and habitats. We tested for local adaptation across alpine habitats in a morphologically variable daisy species, Brachyscome decipiens, in the Bogong High Plains in Victoria, Australia. Read More

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Speciation dynamics and biogeography of Neotropical spiral gingers (Costaceae).

Mol Phylogenet Evol 2016 10 9;103:55-63. Epub 2016 Jul 9.

Departments of Plant and Microbial Biology and Integrative Biology, University of California at Berkeley, 431 Koshland Hall, Berkeley, CA 94720-3102, USA. Electronic address:

Species can arise via the divisive effects of allopatry as well as due to ecological and/or reproductive character displacement within sympatric populations. Two separate lineages of Costaceae are native to the Neotropics; an early-diverging clade endemic to South America (consisting of ca. 16 species in the genera Monocostus, Dimerocostus and Chamaecostus); and the Neotropical Costus clade (ca. Read More

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October 2016

Phylogeny and diversification of mountain vipers (Montivipera, Nilson et al., 2001) triggered by multiple Plio-Pleistocene refugia and high-mountain topography in the Near and Middle East.

Mol Phylogenet Evol 2016 08 7;101:336-351. Epub 2016 May 7.

State Museum of Natural History Braunschweig, Gaußstraße 22, Braunschweig D-38106, Germany. Electronic address:

The Near and Middle East is a hotspot of biodiversity, but the region remains underexplored at the level of genetic biodiversity. Here, we present an extensive molecular phylogeny of the viperid snake genus Montivipera, including all known taxa. Based on nuclear and mitochondrial data, we present novel insights into the phylogeny of the genus and review the status of its constituent species. Read More

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Differences in male coloration are predicted by divergent sexual selection between populations of a cichlid fish.

Proc Biol Sci 2016 05;283(1830)

Department of Fish Ecology and Evolution, EAWAG Swiss Federal Institute of Aquatic Science and Technology, Center for Ecology, Evolution and Biogeochemistry, Seestrasse 79, 6047 Kastanienbaum, Switzerland Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6, 3012 Bern, Switzerland.

Female mating preferences can influence both intraspecific sexual selection and interspecific reproductive isolation, and have therefore been proposed to play a central role in speciation. Here, we investigate experimentally in the African cichlid fish Pundamilia nyererei if differences in male coloration between three para-allopatric populations (i.e. Read More

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Pre- and Postcopulatory Traits of Salvator Male Lizards in Allopatry and Sympatry.

Scientifica (Cairo) 2016 24;2016:8176267. Epub 2016 Mar 24.

Instituto de Diversidad y Ecología Animal (IDEA), CONICET and Laboratorio de Biología del Comportamiento, Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Vélez Sársfield 299, X5000JJC Córdoba, Argentina.

The reproductive traits of males are under influence of sexual pressures before and after copulation. The strength of sexual selection varies across populations because they undergo varying competition for mating opportunities. Besides intraspecific pressures, individuals seem to be subjected to pressures driven by interspecific interactions in sympatry. Read More

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Disruptive selection without genome-wide evolution across a migratory divide.

Mol Ecol 2016 Jun 9;25(11):2529-41. Epub 2016 Mar 9.

Department of Evolutionary Genetics, Max Planck Institute of Evolutionary Biology, August-Thienemann-Str. 2, 24306, Plön, Germany.

Transcontinental migration is a fascinating example of how animals can respond to climatic oscillation. Yet, quantitative data on fitness components are scarce, and the resulting population genetic consequences are poorly understood. Migratory divides, hybrid zones with a transition in migratory behaviour, provide a natural setting to investigate the micro-evolutionary dynamics induced by migration under sympatric conditions. Read More

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Sexual selection and population divergence I: The influence of socially flexible cuticular hydrocarbon expression in male field crickets (Teleogryllus oceanicus).

Evolution 2016 Jan 11;70(1):82-97. Epub 2016 Jan 11.

Centre for Biological Diversity, University of St Andrews, St Andrews, Fife KY16 9TH, United Kingdom.

Debates about how coevolution of sexual traits and preferences might promote evolutionary diversification have permeated speciation research for over a century. Recent work demonstrates that the expression of such traits can be sensitive to variation in the social environment. Here, we examined social flexibility in a sexually selected male trait-cuticular hydrocarbon (CHC) profiles-in the field cricket Teleogryllus oceanicus and tested whether population genetic divergence predicts the extent or direction of social flexibility in allopatric populations. Read More

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January 2016

Divergence in mating signals correlates with genetic distance and behavioural responses to playback.

J Evol Biol 2016 Feb 28;29(2):306-18. Epub 2015 Nov 28.

Centro Interdiciplinario de Investigación para el Desarrollo Integral Regional Unidad Oaxaca (CIIDIR), Instituto Politécnico Nacional, Oaxaca, Mexico.

Animals use acoustic signals to defend resources against rivals and attract breeding partners. As with many biological traits, acoustic signals may reflect ancestry; closely related species often produce more similar signals than do distantly related species. Whether this similarity in acoustic signals is biologically relevant to animals is poorly understood. Read More

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February 2016

Allopatric integrations selectively change host transcriptomes, leading to varied expression efficiencies of exotic genes in Myxococcus xanthus.

Microb Cell Fact 2015 Jul 22;14:105. Epub 2015 Jul 22.

State Key Laboratory of Microbial Technology, School of Life Science, Shandong University, Jinan, 250100, China.

Background: Exotic genes, especially clustered multiple-genes for a complex pathway, are normally integrated into chromosome for heterologous expression. The influences of insertion sites on heterologous expression and allotropic expressions of exotic genes on host remain mostly unclear.

Results: We compared the integration and expression efficiencies of single and multiple exotic genes that were inserted into Myxococcus xanthus genome by transposition and attB-site-directed recombination. Read More

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Population-specific responses to an invasive species.

Proc Biol Sci 2015 Aug;282(1812):20151063

Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Květná 8, Brno 603 65, Czech Republic School of Biology, University of St Andrews, St Andrews, Fife KY16 8LB, UK.

Predicting the impacts of non-native species remains a challenge. As populations of a species are genetically and phenotypically variable, the impact of non-native species on local taxa could crucially depend on population-specific traits and adaptations of both native and non-native species. Bitterling fishes are brood parasites of unionid mussels and unionid mussels produce larvae that parasitize fishes. Read More

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