Large-scale gene flow in the barnacle Jehlius cirratus and contrasts with other broadly-distributed taxa along the Chilean coast

We evaluate the population genetic structure of the intertidal barnacleJehlius cirratusacross a broad portion of its geographic distribution using data from the mitochondrial cytochrome oxidase I (COI) gene region. Despite sampling diversity from over 3,000 km of the linear range of this species, there is only slight regional structure indicated, with overall ΦCTof 0.036 (p < 0.001) yet no support for isolation by distance. While these results suggest greater structure than previous studies ofJ. cirratushad indicated, the pattern of diversity is still far more subtle than in other similarly-distributed species with similar larval and life history traits. We compare these data and results with recent findings in four other intertidal species that have planktotrophic larvae. There are no clear patterns among these taxa that can be associated with intertidal depth or other known life history traits.

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Large-scale gene flow in the barnacle Jehlius cirratus and contrasts with other broadly-distributed taxa along the Chilean coast

10.7287/peerj.preprints.596v3 ◽

2016 ◽

Author(s):

Baoying Guo ◽

John P Wares

Keyword(s):

Life History ◽

Population Genetic ◽

Large Scale ◽

Life History Traits ◽

Isolation By Distance ◽

Coi Gene ◽

Regional Structure ◽

Planktotrophic Larvae ◽

Using Data ◽

Mitochondrial Cytochrome Oxidase

We evaluate the population genetic structure of the intertidal barnacle Jehlius cirratus across a broad portion of its geographic distribution using data from the mitochondrial cytochrome oxidase I (COI) gene region. Despite sampling diversity from over 3000km of the linear range of this species, there is only slight regional structure indicated, with overall ΦCT of 0.036 (p<0.001) yet no support for isolation by distance. While these results suggest greater structure than previous studies of J. cirratus had indicated, the pattern of diversity is still far more subtle than in other similarly-distributed species with similar larval and life history traits. We compare these data and results with recent findings in four other intertidal species that have planktotrophic larvae. There are no clear patterns among these taxa that can be associated with intertidal depth or other known life history traits.

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Large-scale gene flow in the barnacle Jehlius cirratus and contrasts with other broadly-distributed taxa along the Chilean coast

10.7287/peerj.preprints.596v4 ◽

2016 ◽

Author(s):

Baoying Guo ◽

John P Wares

Keyword(s):

Life History ◽

Population Genetic ◽

Large Scale ◽

Life History Traits ◽

Isolation By Distance ◽

Coi Gene ◽

Regional Structure ◽

Planktotrophic Larvae ◽

Using Data ◽

Mitochondrial Cytochrome Oxidase

We evaluate the population genetic structure of the intertidal barnacle Jehlius cirratus across a broad portion of its geographic distribution using data from the mitochondrial cytochrome oxidase I (COI) gene region. Despite sampling diversity from over 3000km of the linear range of this species, there is only slight regional structure indicated, with overall ΦCT of 0.036 (p<0.001) yet no support for isolation by distance. While these results suggest greater structure than previous studies of J. cirratus had indicated, the pattern of diversity is still far more subtle than in other similarly-distributed species with similar larval and life history traits. We compare these data and results with recent findings in four other intertidal species that have planktotrophic larvae. There are no clear patterns among these taxa that can be associated with intertidal depth or other known life history traits.

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Why not do phylogeography on every chthamalid barnacle? The case of Jehlius cirratus

10.7287/peerj.preprints.596v2 ◽

2014 ◽

Author(s):

John P Wares

Keyword(s):

Population Structure ◽

Genetic Structure ◽

Population Genetic Structure ◽

Population Genetic ◽

Coi Gene ◽

Phylogeographic Structure ◽

Mitochondrial Cytochrome ◽

Using Data ◽

Mitochondrial Cytochrome Oxidase ◽

Null Expectation

Here I evaluate the population genetic structure of the barnacle Jehlius cirratus across a broad portion of its geographic distribution using data from the mitochondrial cytochrome oxidase I (COI) gene region. Despite sampling diversity from close to 3000km of the linear range of this barnacle, there is little evidence for population structure. Hudson's Snn value across all sites is not significantly different from null expectation, and no other phylogeographic structure is evident. Unbalanced sample sizes and their effect on such population genetic and phylogeographic analyses are discussed, but the general conclusion of this study is that J. cirratus can be considered panmictic along the Chilean coast.

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Why not do phylogeography on every chthamalid barnacle? The case of Jehlius cirratus

10.7287/peerj.preprints.596v1 ◽

2014 ◽

Author(s):

John P Wares

Keyword(s):

Population Structure ◽

Genetic Structure ◽

Population Genetic Structure ◽

Population Genetic ◽

Coi Gene ◽

Phylogeographic Structure ◽

Mitochondrial Cytochrome ◽

Using Data ◽

Mitochondrial Cytochrome Oxidase ◽

Null Expectation

Here I evaluate the population genetic structure of the barnacle Jehlius cirratus across a broad portion of its geographic distribution using data from the mitochondrial cytochrome oxidase I (COI) gene region. Despite sampling diversity from close to 2500km of the linear range of this barnacle, there is little evidence for population structure. Hudson's Snn value across all sites is not significantly different from null expectation, and no other phylogeographic structure is evident. Unbalanced sample sizes and their effect on such population genetic and phylogeographic analyses are discussed, but the general conclusion of this study is that J. cirratus can be considered panmictic along the Chilean coast.

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Mapping the adaptive landscape of a major agricultural pathogen reveals evolutionary constraints across heterogeneous environments

The ISME Journal ◽

10.1038/s41396-020-00859-w ◽

2021 ◽

Author(s):

Anik Dutta ◽

Fanny E. Hartmann ◽

Carolina Sardinha Francisco ◽

Bruce A. McDonald ◽

Daniel Croll

Keyword(s):

Life History ◽

Large Scale ◽

Life History Traits ◽

Genetic Correlations ◽

Stress Factors ◽

Life History Trait ◽

Adaptive Landscape ◽

Heterogeneous Environments ◽

Growth Responses ◽

Trade Offs

AbstractThe adaptive potential of pathogens in novel or heterogeneous environments underpins the risk of disease epidemics. Antagonistic pleiotropy or differential resource allocation among life-history traits can constrain pathogen adaptation. However, we lack understanding of how the genetic architecture of individual traits can generate trade-offs. Here, we report a large-scale study based on 145 global strains of the fungal wheat pathogen Zymoseptoria tritici from four continents. We measured 50 life-history traits, including virulence and reproduction on 12 different wheat hosts and growth responses to several abiotic stressors. To elucidate the genetic basis of adaptation, we used genome-wide association mapping coupled with genetic correlation analyses. We show that most traits are governed by polygenic architectures and are highly heritable suggesting that adaptation proceeds mainly through allele frequency shifts at many loci. We identified negative genetic correlations among traits related to host colonization and survival in stressful environments. Such genetic constraints indicate that pleiotropic effects could limit the pathogen’s ability to cause host damage. In contrast, adaptation to abiotic stress factors was likely facilitated by synergistic pleiotropy. Our study illustrates how comprehensive mapping of life-history trait architectures across diverse environments allows to predict evolutionary trajectories of pathogens confronted with environmental perturbations.

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Genome size correlates with reproductive fitness in seed beetles

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2015.1421 ◽

2015 ◽

Vol 282 (1815) ◽

pp. 20151421 ◽

Cited By ~ 14

Author(s):

Göran Arnqvist ◽

Ahmed Sayadi ◽

Elina Immonen ◽

Cosima Hotzy ◽

Daniel Rankin ◽

...

Keyword(s):

Life History ◽

Natural Selection ◽

Genome Size ◽

Evolutionary Biology ◽

Large Scale ◽

Life History Traits ◽

Single Species ◽

Reproductive Fitness ◽

Correlated Evolution ◽

Seed Beetles

The ultimate cause of genome size (GS) evolution in eukaryotes remains a major and unresolved puzzle in evolutionary biology. Large-scale comparative studies have failed to find consistent correlations between GS and organismal properties, resulting in the ‘ C -value paradox’. Current hypotheses for the evolution of GS are based either on the balance between mutational events and drift or on natural selection acting upon standing genetic variation in GS. It is, however, currently very difficult to evaluate the role of selection because within-species studies that relate variation in life-history traits to variation in GS are very rare. Here, we report phylogenetic comparative analyses of GS evolution in seed beetles at two distinct taxonomic scales, which combines replicated estimation of GS with experimental assays of life-history traits and reproductive fitness. GS showed rapid and bidirectional evolution across species, but did not show correlated evolution with any of several indices of the relative importance of genetic drift. Within a single species, GS varied by 4–5% across populations and showed positive correlated evolution with independent estimates of male and female reproductive fitness. Collectively, the phylogenetic pattern of GS diversification across and within species in conjunction with the pattern of correlated evolution between GS and fitness provide novel support for the tenet that natural selection plays a key role in shaping GS evolution.

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Population genetic structure of wild riceOryza glumaepatuladistributed in the Amazon flood area influenced by its life‐history traits

Molecular Ecology ◽

10.1046/j.1365-294x.1998.00485.x ◽

1998 ◽

Vol 7 (10) ◽

pp. 1371-1381 ◽

Cited By ~ 46

Author(s):

M. AKIMOTO ◽

Y. SHIMAMOTO ◽

H. MORISHIMA

Keyword(s):

Life History ◽

Genetic Structure ◽

Population Genetic Structure ◽

Population Genetic ◽

Life History Traits

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Mitochondrial cytochrome oxidase I in tetranychid mites: a comparison between molecular phylogeny and changes of morphological and life history traits

Bulletin of Entomological Research ◽

10.1017/s0007485300034994 ◽

1996 ◽

Vol 86 (4) ◽

pp. 407-417 ◽

Cited By ~ 73

Author(s):

Maria Navajas ◽

Jean Gutierrez ◽

Jacques Lagnel ◽

Pierre Boursot

Keyword(s):

Life History ◽

Cytochrome Oxidase ◽

Life History Traits ◽

Codon Position ◽

Morphological Characters ◽

Mitochondrial Cytochrome ◽

Mode Of Reproduction ◽

The Third ◽

Mode Of Life ◽

Mitochondrial Cytochrome Oxidase

AbstractSpider mites, Tetranychidae, represent one of the most cosmopolitan and economically important groups of terrestrial arthropods; however, many aspects of their evolutionary relationships remain uncertain. We sequenced part of the mitochondrial cytochrome oxidase subunit I (COI) gene in 20 species of phytophagous mites belonging to nine genera and two families (Tetranychidae and Tenuipalpidae), including several agricultural pests. As eported in insects, the sequences were extremely rich in A + T (75% on average), especially in the third codon position (95%). However, one of the genera we studied had a significantly lower A + T content (69% on average, 78% in the third codon position), showing that base composition can change substantially over short periods of time. Most interspecific differences were transversions and their number increased steadily with the number of non-synonymous differences, while the number of transitions remained constant. The phylogeny based on COI sequences was inferred using the maximum likelihood method. The results are compatible as a whole with the traditional classification based on morphological characters, but call for some minor taxonomic revisions. Some morphological characters and life history traits (mode of reproduction, adaptation to the host plant) were also analysed within this phylogenetic framework. At the family level, one can see a trend towards thelytoky becoming rarer compared to the general mode of reproduction of the group, arrhenotoky. There is also an evolutionary tendency towards a more complex mode of life, with the production of silk webs and correlated changes of the locomotion apparatus. However, in the Tetranychidae there seems to have been convergent evolution of these morphological characters together with independent development of a common adaptation to this mode of life in different genera.

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