scholarly journals Genetic diversity in clustered colonies of an Antarctic marine mesopredator: a role for habitat quality?

2021 ◽  
pp. 1-10
Author(s):  
Emiliano Mori ◽  
Claudia Brunetti ◽  
Antonio Carapelli ◽  
Lucia Burrini ◽  
Niccolò Fattorini ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Habitat Quality ◽  
Ross Sea ◽  
Molecular Genetic ◽  
Assignment Test ◽  
Pygoscelis Adeliae ◽  
Seabird Species ◽  
Low Genetic Diversity ◽  
Key Species

Abstract Genetic structure may be highly variable across seabird species, and particularly among those that are distributed over large geographical areas. The Adélie penguin (Pygoscelis adeliae) is a numerically dominant Antarctic seabird that is considered to be a key species in coastal ecosystems. Since the Last Glacial Maximum, penguin colonization of the Antarctic coastline occurred at varying geographical and temporal scales, contributing to an incomplete understanding of how modern colonies relate to each other at local or regional scales. We assessed the population genetic structure of Adélie penguins (n = 86 individuals) from three adjacent colonies along the Victoria Land coast using molecular genetic markers (i.e. seven microsatellite loci isolated through next-generation sequencing). Our results indicate meta-population dynamics and possibly relationships with habitat quality. A generally low genetic diversity (Nei's index: 0.322–0.667) was observed within each colony, in contrast to significant genetic heterogeneity among colonies (pairwise FST = 0.071–0.148), indicating that populations were genetically structured. Accordingly, an assignment test correctly placed individuals within the respective colonies from which they were sampled. The presence of inter-colony genetic differentiation contrasts with previous studies on this species that showed a lack of genetic structure, possibly due to higher juvenile or adult dispersal. Our sampled colonies were not panmictic and suggest a lower migration rate, which may reflect relatively stable environmental conditions in the Ross Sea compared to other regions of Antarctica, where the ocean climate is warming.

scholarly journals Pronounced genetic structure and low genetic diversity in European red-billed chough (Pyrrhocorax pyrrhocorax) populations

2012 ◽  
Vol 13 (5) ◽  
pp. 1213-1230 ◽  
Author(s):  
Marius A. Wenzel ◽  
Lucy M. I. Webster ◽  
Guillermo Blanco ◽  
Malcolm D. Burgess ◽  
Christian Kerbiriou ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Low Genetic Diversity

scholarly journals Erratum to: Pronounced genetic structure and low genetic diversity in European red-billed chough (Pyrrhocorax pyrrhocorax) populations

2014 ◽  
Vol 16 (4) ◽  
pp. 1011-1012
Author(s):  
Marius A. Wenzel ◽  
Lucy M. I. Webster ◽  
Guillermo Blanco ◽  
Malcolm D. Burgess ◽  
Christian Kerbiriou ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Low Genetic Diversity

scholarly journals Molecular Dissection for Boll Shedding in Upland Cotton Using Microsatellites

2021 ◽  
pp. 34-41
Author(s):  
Kanwal Zia ◽  
Syed Bilal Hussain
Keyword(s):  
Genetic Diversity ◽  
Dna Markers ◽  
Association Studies ◽  
Molecular Genetic ◽  
Phenotypic Traits ◽  
Marker Assisted Breeding ◽  
Molecular Genetic Diversity ◽  
Low Genetic Diversity ◽  
Cotton Genotypes ◽  
Single Cluster

DNA markers application in marker-assisted breeding of cotton is handicapped due to low genetic diversity in cotton germplasm. The present study was designed to identify DNA markers, predominately simple sequence repeats (SSRs), associated with tolerance/resistance to heat stress as a consequence of boll shedding. To find out the genetic diversity a total of 24 cotton genotypes and 50 SSR primers were used. Total 288 alleles were produced with an average of 5.7 alleles per primer. Bootstrap cluster analysis used to generate a dendrogram that cluster the 24 accessions into two main clusters. Eleven out of 24 genotypes fall in a single cluster. Phenotypically H-4074 gives more diversity, while genotypically H-4074 sheared the same genetic background as H-4070, H-4091 and H-4090. Low genetic diversity was observed among both genotypic and phenotypic as maximum varieties fall in single group. This study helps for selecting diverse accessions with multiple phenotypic traits, which were drought to boll shedding. It suggests further elaborating the molecular genetic diversity by using new SSR marker to improve the yield of cotton cultivars. These preliminary results set the stage for initiating in depth marker-trait association studies, which will be instrumental for initiating marker-assisted breeding in cotton.

scholarly journals Low genetic diversity and intrapopulation spatial genetic structure of the Atlantic Forest tree, Esenbeckia leiocarpa Engl. (Rutaceae)

2014 ◽  
Vol 57 (2) ◽  
pp. 1 ◽  
Author(s):  
Giullia Forti ◽  
Evandro Vagner Tambarussi ◽  
Paulo Yoshio Kageyama ◽  
Maria Andreia Moreno ◽  
Elza Martins Ferraz ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Atlantic Forest ◽  
Spatial Genetic Structure ◽  
Forest Tree ◽  
Low Genetic Diversity

scholarly journals Limited Genetic Structure of Gypsy Moth Populations Reflecting a Recent History in Europe

Insects ◽  
2018 ◽  
Vol 9 (4) ◽  
pp. 143 ◽  
Author(s):  
Nikola Lacković ◽  
Milan Pernek ◽  
Coralie Bertheau ◽  
Damjan Franjević ◽  
Christian Stauffer ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Gypsy Moth ◽  
Phylogenetic Reconstruction ◽  
Population Expansion ◽  
Balkan Peninsula ◽  
Coi Gene ◽  
Mitochondrial Coi ◽  
Low Genetic Diversity ◽  
Genetic Structure And Diversity

The gypsy moth, Lymantria dispar, a prominent polyphagous species native to Eurasia, causes severe impacts in deciduous forests during irregular periodical outbreaks. This study aimed to describe the genetic structure and diversity among European gypsy moth populations. Analysis of about 500 individuals using a partial region of the mitochondrial COI gene, L. dispar was characterized by low genetic diversity, limited population structure, and strong evidence that all extant haplogroups arose via a single Holocene population expansion event. Overall 60 haplotypes connected to a single parsimony network were detected and genetic diversity was highest for the coastal populations Croatia, Italy, and France, while lowest in continental populations. Phylogenetic reconstruction resulted in three groups that were geographically located in Central Europe, Dinaric Alps, and the Balkan Peninsula. In addition to recent events, the genetic structure reflects strong gene flow and the ability of gypsy moth to feed on about 400 deciduous and conifer species. Distinct genetic groups were detected in populations from Georgia. This remote population exhibited haplotypes intermediate to the European L. dispar dispar, Asian L. dispar asiatica, and L. dispar japonica clusters, highlighting this area as a possible hybridization zone of this species for future studies applying genomic approaches.

scholarly journals Genetic Structure of Populations of the Pinewood Nematode Bursaphelenchus xylophilus, the Pathogen of Pine Wilt Disease, Between and Within Pine Forests

2007 ◽  
Vol 97 (3) ◽  
pp. 304-310 ◽  
Author(s):  
Zhihua Zhou ◽  
Daisuke Sakaue ◽  
Bingyun Wu ◽  
Taizo Hogetsu
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Genetic Difference ◽  
Pine Wilt Disease ◽  
Bursaphelenchus Xylophilus ◽  
Pine Forests ◽  
Pinewood Nematode ◽  
High Genetic Diversity ◽  
Low Genetic Diversity ◽  
Individual Trees

We analyzed the genetic structure of Bursaphelenchus xylophilus populations within individual trees (subpopulations) in three distant pine forests (Tanashi, Tsukuba, and Chiba in Japan) based on the polymorphism of four microsatellite (SSR) markers. Most of the nematodes from subpopulations in Tanashi showed the same genotype over 2 years, indicating that nematodes of that genotype dominated there for years. In contrast, 16 and 15 genotypes were identified in nematode populations from Tsukuba and Chiba, respectively. Despite the high genetic diversity within the Tsukuba and Chiba populations, extremely low genetic diversity was observed within the subpopulations. The genetic difference between the Tsukuba and Chiba populations was significantly smaller than that between Tanashi and either Tsukuba or Chiba. Observed heterozygosity was significantly less than expected based on Hardy-Weinberg equilibrium. These findings are best explained by a founder effect, geographic isolation between populations, explosive nematode multiplication from a small number within individual trees, and the Wahlund effect.

scholarly journals Genetic diversity of the species Leporinus elongatus (Teleostei: Characiformes) in the Canoas Complex - Paranapanema River

2012 ◽  
Vol 10 (4) ◽  
pp. 821-828 ◽  
Author(s):  
Juliano Vilas Boas Ramos ◽  
Leda Maria Koelblinger Sodré ◽  
Mário Luís Orsi ◽  
Fernanda Simões de Almeida
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Fish Species ◽  
Fish Fauna ◽  
Aquatic Organisms ◽  
Reproductive Period ◽  
Migration Behavior ◽  
Migratory Fish ◽  
Low Genetic Diversity ◽  
High Level

Dams constructed along waterways interrupt the dispersion and migration of aquatic organisms, affecting mainly the abundance of migratory fish species. Translocation mechanisms have been constructed at dams aiming to minimize their impact on fish species migration behavior. There is little information available about the effect of the construction of dams on the genetic structure of the Neotropical migratory fish fauna. Therefore, RAPD molecular markers and microsatellites were utilized to evaluate the diversity and genetic structure of the migratory species Leporinus elongatus (piapara) in the Canoas Complex - Paranapanema River - Brazil. Ten groups were sampled in the fish ladders of the hydroelectric dam Canoas I and Canoas II during the reproductive period in three consecutive years. Both markers showed a high level of genetic diversity within these groups. The microsatellite markers demonstrated a loss of heterozygosity and a considerable level of inbreeding in the species. The genetic differentiation found among the groups with both markers utilized is within a range from low to moderate. The data obtained with the parameter of genetic diversity among the groups led to the conclusion that the groups of L. elongatus of the Canoas Complex are structured as a single population composed of sub-populations with low genetic diversity among them. The data on genetic diversity and population structure of L. elongatus are of great importance for the development of the species management and conservation programs in the Canoas Complex, which can also be utilized in aquaculture programs.

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