Discordant Genetic Diversity and Geographic Patterns BetweenCrassicutis cichlasomae(Digenea: Apocreadiidae) and its Cichlid Host, “Cichlasoma”urophthalmus(Osteichthyes: Cichlidae), in Middle-America

2013 ◽  
Vol 99 (6) ◽  
pp. 978-988 ◽  
Author(s):  
Ulises Razo-Mendivil ◽  
Ella Vázquez-Domínguez ◽  
Gerardo Pérez-Ponce de León
Keyword(s):  
Genetic Diversity ◽  
Geographic Patterns ◽  
Middle America ◽  
Cichlasoma Urophthalmus

Geographic patterns of genetic diversity in North American trees: a continent-wide analysis

2021 ◽  
Author(s):  
Andrew V. Gougherty
Keyword(s):  
Genetic Diversity ◽  
Population Genetics ◽  
North America ◽  
North American ◽  
Tree Species ◽  
Geographic Patterns ◽  
Study Characteristics ◽  
Dispersal Traits ◽  
The Last Glacial Maximum ◽  
The Last Glacial

In the northern hemisphere, many species have been reported to have greater genetic diversity in southern populations than northern populations - ostensibly due to migration northward following the last glacial maximum (LGM). The generality of this pattern, while well-established for some taxa, remains unclear for North American trees. To address this issue, I collected published population genetics data for 73 North American tree species, and tested whether genetic diversity was associated with latitude or longitude and whether geographic trends were associated with dispersal traits, range or study characteristics. I found there were no general geographic patterns in genetic diversity, and the strength of the geographic gradients were not associated with any species or study characteristics. Species in the northern and western regions of North America tended to have more species with genetic diversity that declined with latitude, but most species had no significant trend. This work shows that North American trees have complex, individualistic, patterns of genetic diversity that may negate explanation by any particular dispersal trait or range characteristic.

Groundwater oligochaetes show complex genetic patterns of distribution in the Pilbara region of Western Australia

2015 ◽  
Vol 29 (5) ◽  
pp. 405 ◽  
Author(s):  
Louise Brown ◽  
Terrie Finston ◽  
Garth Humphreys ◽  
Stefan Eberhard ◽  
Adrian Pinder
Keyword(s):  
Genetic Diversity ◽  
Western Australia ◽  
Surface Waters ◽  
Ecological Niches ◽  
Mitochondrial Coi ◽  
Groundwater Fauna ◽  
Ecological Requirements ◽  
Large Size ◽  
Geographic Patterns ◽  
Genetic Patterns

Patterns of genetic diversity in the groundwater fauna of Australia have largely focused on obligate stygobites of relatively large size, namely, crustaceans. Oligochaete worms, with their smaller size and broader ecological niches, provide a contrasting model in which to examine such patterns. Genetic diversity in subterranean oligochaetes in the Pilbara region of Western Australia were examined using one nuclear (18S) and two mitochondrial (COI, 12S) regions. The observed variation was assessed at three levels of hydrology – river basin, creek catchment, and individual bore or site – to document geographic patterns. Most species appeared to be restricted to an individual catchment; however, five species, representing three families, were widespread, with some haplotypes being shared between bores, catchments and even basins. General patterns suggest that while hydrology plays a role in the distribution of oligochaete species, it does not always confine them to catchments, in contrast to patterns observed in groundwater isopods and amphipods in the region. We suggest that intrinsic characteristics of oligochaetes, such as body size, shape, reproductive strategy and ecological requirements, may have allowed them greater dispersal within the subterranean biome of the Pilbara. In particular, oligochaetes may occupy subterranean and surface waters, increasing their opportunities for dispersal.

scholarly journals Genetic Landscapes Reveal How Human Genetic Diversity Aligns with Geography

2019 ◽  
Vol 37 (4) ◽  
pp. 943-951 ◽  
Author(s):  
Benjamin M Peter ◽  
Desislava Petkova ◽  
John Novembre
Keyword(s):  
Genetic Diversity ◽  
Geographic Distance ◽  
Population History ◽  
Human Populations ◽  
Geographic Patterns ◽  
Local Patterns ◽  
New Perspective ◽  
Post Hoc ◽  
Genetic Medicine ◽  
The Relationship

Abstract Geographic patterns in human genetic diversity carry footprints of population history and provide insights for genetic medicine and its application across human populations. Summarizing and visually representing these patterns of diversity has been a persistent goal for human geneticists, and has revealed that genetic differentiation is frequently correlated with geographic distance. However, most analytical methods to represent population structure do not incorporate geography directly, and it must be considered post hoc alongside a visual summary of the genetic structure. Here, we estimate “effective migration” surfaces to visualize how human genetic diversity is geographically structured. The results reveal local patterns of differentiation in detail and emphasize that while genetic similarity generally decays with geographic distance, the relationship is often subtly distorted. Overall, the visualizations provide a new perspective on genetics and geography in humans and insight to the geographic distribution of human genetic variation.

scholarly journals Geographic patterns of genetic diversity in two species complexes of Canadian marine bivalves

2015 ◽  
Vol 82 (2) ◽  
pp. 282-291 ◽  
Author(s):  
Kara K. S. Layton ◽  
André L. Martel ◽  
Paul D. N. Hebert
Keyword(s):  
Genetic Diversity ◽  
Geographic Patterns ◽  
Species Complexes ◽  
Marine Bivalves

scholarly journals Biogeography and Microscale Diversity Shape the Biosynthetic Potential of Fungus-growing Ant-associated Pseudonocardia

2019 ◽  
Author(s):  
Bradon R. McDonald ◽  
Marc G. Chevrette ◽  
Jonathan L. Klassen ◽  
Heidi A. Horn ◽  
Eric J. Caldera ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Core Genome ◽  
Genomic Analysis ◽  
Barro Colorado Island ◽  
Bacterial Populations ◽  
Ant Colonies ◽  
Geographic Patterns ◽  
Population Genomic ◽  
Close Proximity ◽  
Fungus Growing Ants

AbstractThe geographic and phylogenetic scale of ecologically relevant microbial diversity is still poorly understood. Using a model mutualism, fungus-growing ants and their defensive bacterial associate Pseudonocardia, we analyzed genetic diversity and biosynthetic potential in 46 strains isolated from ant colonies in a 20km transect near Barro Colorado Island in Panama. Despite an average pairwise core genome similarity of greater than 99%, population genomic analysis revealed several distinct bacterial populations matching ant host geographic distribution. We identified both genetic diversity signatures and divergent genes distinct to each lineage. We also identify natural product biosynthesis clusters specific to isolation locations. These geographic patterns were observable despite the populations living in close proximity to each other and provides evidence of ongoing genetic exchange. Our results add to the growing body of literature suggesting that variation in traits of interest can be found at extremely fine phylogenetic scales.

Geographic patterns in the genetic diversity of a northern sedge, Carex rariflora

1999 ◽  
Vol 77 (2) ◽  
pp. 269-278 ◽  
Author(s):  
Mark Vellend ◽  
Marcia J. Waterway
Keyword(s):  
Genetic Diversity ◽  
Geographic Patterns

Allozyme variation in black locust (Robiniapseudoacacia)

1989 ◽  
Vol 19 (4) ◽  
pp. 471-479 ◽  
Author(s):  
Scott E. Surles ◽  
J. L. Hamrick ◽  
B. C. Bongarten
Keyword(s):  
Genetic Diversity ◽  
Black Locust ◽  
Robinia Pseudoacacia ◽  
Allozyme Variation ◽  
Seed Sources ◽  
Geographic Patterns ◽  
Natural Range ◽  
Successional Species ◽  
Robinia Pseudoacacia L ◽  
Intrapopulational Variation

Seedlings from 23 seed sources representing the natural range of black locust (Robinia pseudoacacia L.) were electrophoretically analyzed at 40 structural loci representing 18 enzyme systems. Genetic diversity was high for an insect-pollinated, early-successional species. On average, 71% of the loci were polymorphic (99% criterion). Average and effective numbers of alleles per locus were 2.61 and 1.58, respectively. Mean expected heterozygosity was 0.291, ranging among the seed sources from 0.250 to 0.322. Most of the genetic diversity (88%) resided within seed sources. Few geographic patterns were evident. The most differentiated sources were located in disjunct sites in Georgia and the Ozark Mountains of Arkansas and Missouri, and in Pennsylvania. The widespread planting of native and European black locust seed sources may have contributed to the lack of geographic patterns. Based on this and other studies, it was concluded that initial selections in black locust breeding programs should concentrate on intrapopulational variation.

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