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

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.

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

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.

scholarly journals Birds are islands for parasites

2014 ◽  
Vol 10 (8) ◽  
pp. 20140255 ◽  
Author(s):  
Jennifer A. H. Koop ◽  
Karen E. DeMatteo ◽  
Patricia G. Parker ◽  
Noah K. Whiteman
Keyword(s):  
Population Structure ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Evolutionary Biology ◽  
Isolation By Distance ◽  
Spatial Scales ◽  
Island Populations ◽  
Louse Species ◽  
Parasite Populations

Understanding the mechanisms driving the extraordinary diversification of parasites is a major challenge in evolutionary biology. Co-speciation, one proposed mechanism that could contribute to this diversity is hypothesized to result from allopatric co-divergence of host–parasite populations. We found that island populations of the Galápagos hawk ( Buteo galapagoensis ) and a parasitic feather louse species ( Degeeriella regalis ) exhibit patterns of co-divergence across variable temporal and spatial scales. Hawks and lice showed nearly identical population genetic structure across the Galápagos Islands. Hawk population genetic structure is explained by isolation by distance among islands. Louse population structure is best explained by hawk population structure, rather than isolation by distance per se , suggesting that lice tightly track the recent population histories of their hosts. Among hawk individuals, louse populations were also highly structured, suggesting that hosts serve as islands for parasites from an evolutionary perspective. Altogether, we found that host and parasite populations may have responded in the same manner to geographical isolation across spatial scales. Allopatric co-divergence is likely one important mechanism driving the diversification of parasites.

scholarly journals Population structure of Opisthorchis felineus (Trematoda) and its second intermediate hosts — cyprinid fishes in the Ob-Irtysh focus of opisthorchiasis, based on allozyme data

2014 ◽  
Vol 51 (4) ◽  
pp. 309-317 ◽  
Author(s):  
O. Zhigileva ◽  
V. Ozhireľev ◽  
T. Stepanova ◽  
T. Moiseenko
Keyword(s):  
Population Structure ◽  
Genetic Structure ◽  
Genetic Differentiation ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Allozyme Variation ◽  
Intermediate Hosts ◽  
Opisthorchis Felineus ◽  
Cyprinid Fishes ◽  
Low Levels

AbstractGenetic variability of West Siberian populations of Opisthorchis felineus and two species of cyprinid fish, its second intermediate hosts, was studied by isozyme analysis. Low levels of allozyme variation and genetic differentiation in O. felineus from the Ob-Irtysh focus of opisthorchiasis were detected. The proportion of polymorphic loci was 21.1 %, the average observed heterozygosity (Hobs) was 0.008, and expected heterozygosity (Hexp) was 0.052. For most loci in O. felineus deficit of heterozygotes (FIS = 0.7424) was observed. A comparison of population genetic structure of fish and parasites showed they were not congruent. Estimates of genetic differentiation of the parasite were smaller than for the fish — its intermediate host. Migration and population structure of the second intermediate hosts do not play an important role in formation of the population-genetic structure of O. felineus in the Ob-Irtysh focus of opisthorchiasis.

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

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.

Sign in / Sign up

Export Citation Format

Share Document