Remnant populations of the regal fritillary (Speyeria idalia) in Pennsylvania: Local genetic structure in a high gene flow species

2006 ◽  
Vol 7 (2) ◽  
pp. 309-313 ◽  
Author(s):  
Nusha Keyghobadi ◽  
Katherine P. Unger ◽  
Jason D. Weintraub ◽  
Dina M. Fonseca
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
High Gene Flow ◽  
High Gene ◽  
Speyeria Idalia

scholarly journals Evidence for fine-scale genetic structure and estuarine colonisation in a potential high gene flow marine goby (Pomatoschistus minutus)

Heredity ◽  
2004 ◽  
Vol 92 (5) ◽  
pp. 434-445 ◽  
Author(s):  
C Pampoulie ◽  
E S Gysels ◽  
G E Maes ◽  
B Hellemans ◽  
V Leentjes ◽  
...  
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Fine Scale ◽  
Pomatoschistus Minutus ◽  
High Gene Flow ◽  
High Gene

scholarly journals Host movement and the genetic structure of populations of parasitic nematodes.

Genetics ◽  
1995 ◽  
Vol 141 (3) ◽  
pp. 1007-1014 ◽  
Author(s):  
M S Blouin ◽  
C A Yowell ◽  
C H Courtney ◽  
J B Dame
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Population Genetic ◽  
Isolation By Distance ◽  
Parasitic Nematodes ◽  
Great Opportunity ◽  
High Gene Flow ◽  
Mtdna Sequence ◽  
High Gene ◽  
Host Movement

Abstract Mitochondrial DNA (mtDNA) sequence data were used to compare the population genetic structures of five species of parasitic nematodes from three different hosts: Ostertagia ostertagi and Haemonchus placei from cattle, H. contortus and Teladorsagia circumcincta from sheep, and Mazamastrongylus odocoilei from white-tailed deer. The parasites of sheep and cattle showed a pattern consistent with high gene flow among populations. The parasite of deer showed a pattern of substantial population subdivision and isolation by distance. It appears that host movement is an important determinant of population genetic structure in these nematodes. High gene flow in the parasites of livestock also indicates great opportunity for the spread of rare alleles that confer resistance to anthelmintic drugs. All species, including the parasite of deer, had unusually high within-population diversities (averages of 0.019-0.027 substitutions per site between pairs of individuals from the same population). Large effective population sizes (Ne), perhaps in combination with rapid mtDNA evolution, appear to be the most likely explanation for these high within-population diversities.

scholarly journals Phylogeny, Connectivity and Dispersal Patterns of the Giant Kelp Macrocystis (Phaeophyceae)

2021 ◽  
Author(s):  
◽  
Erasmo Carlos Macaya Horta
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Global Analysis ◽  
Management Strategies ◽  
Dispersal Patterns ◽  
Dispersal Mechanism ◽  
Southeastern Pacific ◽  
High Gene Flow ◽  
High Gene ◽  
Coi Sequences

<p>Macrocystis represents the most widely distributed kelp genus, providing structure and energy for one of the most productive ecosystems on earth. Despite its ecological and economical importance, many aspects of its taxonomy, distribution and dispersal still remain unknown. Using different molecular markers I studied the taxonomy, phylogeography and dispersal patterns of Macrocystis. The analysis involves samples from different populations throughout the world. Using the DNA barcoding method I, confirmed previous suggestions that the genus must be considered as monospecific, M. pyrifera being the only species. The effects of historical and contemporary events on the haplotype distribution were determined by analyzing samples from the southeastern Pacific (SEP) using the atp8-S mitochondrial marker. The last glacial maximum as well as oceanographic anomalies (El Niño phenomena) may be important factors driving the genetic pattern along the SEP. The genetic structure in southern Chile was also analyzed in more detail, especially in the Chilean Fjords. Samples from attached and floating kelp individuals revealed that dispersal via kelp rafts is possible. Finally, a global analysis using COI sequences showed shared haplotypes along vast distances in the Northern and Southern hemispheres, recent dispersal and high gene flow can explain such genetic homogeneity. Additionally, microsatellite analysis confirmed that gene flow along the Southern Ocean is occurring over ecological time scales, where rafting of detached reproductive kelps seems to be facilitated by the Antarctic Circumpolar Current connecting populations in the Southern Hemisphere. This study has provided valuable genetic evidence to understand factors shaping the genetic structure of this important ecologically and economically species. It also contributes important knowledge for conservation and management strategies, especially in places where M. pyrifera has been harvested. In summary, the results of this study confirm previous suggestions of high gene flow among M. pyrifera populations at different scales. It also provides evidence suggesting that kelp rafts act as an important dispersal mechanism in this species, thus giving important information to understand the factors shaping the evolution of the largest seaweed on earth.</p>

scholarly journals Phylogeny, Connectivity and Dispersal Patterns of the Giant Kelp Macrocystis (Phaeophyceae)

2021 ◽  
Author(s):  
◽  
Erasmo Carlos Macaya Horta
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Global Analysis ◽  
Management Strategies ◽  
Dispersal Patterns ◽  
Dispersal Mechanism ◽  
Southeastern Pacific ◽  
High Gene Flow ◽  
High Gene ◽  
Coi Sequences

<p>Macrocystis represents the most widely distributed kelp genus, providing structure and energy for one of the most productive ecosystems on earth. Despite its ecological and economical importance, many aspects of its taxonomy, distribution and dispersal still remain unknown. Using different molecular markers I studied the taxonomy, phylogeography and dispersal patterns of Macrocystis. The analysis involves samples from different populations throughout the world. Using the DNA barcoding method I, confirmed previous suggestions that the genus must be considered as monospecific, M. pyrifera being the only species. The effects of historical and contemporary events on the haplotype distribution were determined by analyzing samples from the southeastern Pacific (SEP) using the atp8-S mitochondrial marker. The last glacial maximum as well as oceanographic anomalies (El Niño phenomena) may be important factors driving the genetic pattern along the SEP. The genetic structure in southern Chile was also analyzed in more detail, especially in the Chilean Fjords. Samples from attached and floating kelp individuals revealed that dispersal via kelp rafts is possible. Finally, a global analysis using COI sequences showed shared haplotypes along vast distances in the Northern and Southern hemispheres, recent dispersal and high gene flow can explain such genetic homogeneity. Additionally, microsatellite analysis confirmed that gene flow along the Southern Ocean is occurring over ecological time scales, where rafting of detached reproductive kelps seems to be facilitated by the Antarctic Circumpolar Current connecting populations in the Southern Hemisphere. This study has provided valuable genetic evidence to understand factors shaping the genetic structure of this important ecologically and economically species. It also contributes important knowledge for conservation and management strategies, especially in places where M. pyrifera has been harvested. In summary, the results of this study confirm previous suggestions of high gene flow among M. pyrifera populations at different scales. It also provides evidence suggesting that kelp rafts act as an important dispersal mechanism in this species, thus giving important information to understand the factors shaping the evolution of the largest seaweed on earth.</p>

scholarly journals A Method for Detecting Population Genetic Structure in Diverse, High Gene-Flow Species

2010 ◽  
Vol 101 (4) ◽  
pp. 423-436 ◽  
Author(s):  
R. P. Kelly ◽  
T. A. Oliver ◽  
A. Sivasundar ◽  
S. R. Palumbi
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
High Gene Flow ◽  
High Gene
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