Molecular evidence of host-associated genetic differentiation inProdiplosis longifila(Diptera: Cecidomyiidae)

2016 ◽  
Author(s):  
Diana N. Duque-Gamboa
Keyword(s):  
Genetic Differentiation ◽  
Molecular Evidence

scholarly journals MOLECULAR EVIDENCE FOR KIN GROUPS IN THE ABSENCE OF LARGE-SCALE GENETIC DIFFERENTIATION IN A MIGRATORY BIRD

Evolution ◽  
1996 ◽  
Vol 50 (2) ◽  
pp. 924-930 ◽  
Author(s):  
V. L. Friesen ◽  
W. A. Montevecchi ◽  
A. J. Gaston ◽  
R. T. Barrett ◽  
W. S. Davidson
Keyword(s):  
Genetic Differentiation ◽  
Large Scale ◽  
Migratory Bird ◽  
Molecular Evidence

Molecular Evidence for Kin Groups in the Absence of Large-Scale Genetic Differentiation in a Migratory Bird

Evolution ◽  
1996 ◽  
Vol 50 (2) ◽  
pp. 924 ◽  
Author(s):  
V. L. Friesen ◽  
W. A. Montevecchi ◽  
A. J. Gaston ◽  
R. T. Barrett ◽  
W. S. Davidson
Keyword(s):  
Genetic Differentiation ◽  
Large Scale ◽  
Migratory Bird ◽  
Molecular Evidence

scholarly journals Molecular Evidence of Distinct Introductions of the European Race of Gremmeniella abietina into North America

1998 ◽  
Vol 88 (6) ◽  
pp. 582-588 ◽  
Author(s):  
Richard C. Hamelin ◽  
Nicole Lecours ◽  
Gaston Laflamme
Keyword(s):  
United States ◽  
North America ◽  
Genetic Differentiation ◽  
The United States ◽  
Molecular Evidence ◽  
Northeastern United States ◽  
Asexual Propagation ◽  
European Race ◽  
Dna Profiles ◽  
The Eu

The presence of the European (EU) race of Gremmeniella abietina var. abietina, the causal agent of Scleroderris canker of conifers, was first reported in North America in 1975 in the northeastern United States and subsequently in southern Quebec and Newfoundland during the late 1970s, where it quickly became established. We analyzed DNA profiles in samples from a historic collection of G. abietina var. abietina that included some of the first isolates of the EU race reported in the United States to test hypotheses concerning the G. abietina var. abietina epidemic in North America. Genetic diversity was partitioned by an analysis of molecular variance with haplotype frequencies and distances. Genetic differentiation was high between populations in continental North America and Newfoundland (between region differentiation, Φct = 0.665, P < 0.001). This result was not consistent with the hypothesis of a single introduction of the pathogen into the northeastern United States followed by secondary spread into northeastern Canada. In contrast, small levels of genetic differentiation were observed among continental North American populations (Φct = 0.047, P = 0.079), suggesting gene flow among these populations. A single haplotype of G. abietina var. abietina dominated the continental populations (80% of the isolates) but was absent from Newfoundland and Europe. Five haplotypes were found in the New-foundland population, all of which were either absent or very rare on the continent. Populations from continental North America clustered together and were distinct from a second cluster composed of European and Newfoundland populations. A phylogenetic analysis of the haplotypes indicated that some of the rare haplotypes may have derived from somatic mutations, whereas others probably occurred as the result of new introductions. The results are consistent with a scenario of distinct primary introductions of this pathogen into Newfoundland and continental eastern North America followed by secondary asexual propagation.

The aquatic and littoral forms of the Patagonian frog Atelognathus patagonicus (Batrachylinae): new molecular evidence

Zootaxa ◽  
2011 ◽  
Vol 3129 (1) ◽  
pp. 62 ◽  
Author(s):  
LIZA B. MARTINAZZO ◽  
NÉSTOR G. BASSO ◽  
CARMEN A. ÚBEDA
Keyword(s):  
Phenotypic Plasticity ◽  
Genetic Variability ◽  
Genetic Differentiation ◽  
Control Region ◽  
National Park ◽  
Diversity Index ◽  
Morphological Data ◽  
Molecular Evidence ◽  
Balanced Polymorphism ◽  
And Control

Atelognathus patagonicus is one of the eight species included in the Patagonian genus Atelognathus, an endemic frog occurring in the system of endorheic basaltic lagoons of the Laguna Blanca National Park (PNLB), Neuquén, Argentina. Based on morphological data, Cei & Roig (1968) described two forms of A. patagonicus, which they called “aquatic” and “littoral”. These morphotypes were first suggested to belong to different species, but later, Cei (1972) proposed that both forms represent a balanced polymorphism within A. patagonicus. More recently, an ecomorphological study showed that aquatic and littoral are reversible forms of the same individual (phenotypic plasticity). In this paper we compare the morphotypes of A. patagonicus using nucleotide sequences of the mtDNA (cytochrome b and control region) in order to test the existence of genetic differentiation between the aquatic and littoral forms. In addition, we present data of genetic variability of A. patagonicus from the Laguna Blanca system. We did not detect genetic differentiation between littoral and aquatic morphotypes for both genes studied. This observation is consistent with the hypothesis of phenotypic plasticity. In contrast with the expected results for low vagility organisms, the diversity index observed in A. patagonicus revealed a low genetic variability.

scholarly journals Molecular evidence of species- and subspecies-level distinctions in the rare Orchis patens s.l. and implications for conservation

2021 ◽  
Vol 30 (5) ◽  
pp. 1293-1314
Author(s):  
Jacopo Calevo ◽  
Roberta Gargiulo ◽  
Leif Bersweden ◽  
Juan Viruel ◽  
Cristina González-Montelongo ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Genetic Differentiation ◽  
Canary Islands ◽  
Population Decline ◽  
Small Population ◽  
Disjunct Distribution ◽  
Molecular Evidence ◽  
Genetic Diversity And Structure ◽  
Conservation Actions

AbstractCharacterizing genetic diversity and structure of populations is essential for the effective conservation of threatened species. Orchis patens sensu lato is a narrowly distributed tetraploid species with a disjunct distribution (i.e., Northern Italy, North Africa and the Canary Islands), which is facing a severe decline. In this study, we evaluated levels of genetic diversity and population structuring using 12 new nuclear microsatellite markers. Our analyses of genetic differentiation based on multiple approaches (Structure analysis, PCA analysis, and F-statistics using the ploidy-independent Rho-index) showed that gene flow is low across the range of O. patens s.l., particularly in the Canary Islands. Clear differences in allele frequencies between Italy, Algeria and the Canary Islands underlie the genetic differentiation retrieved. Our study provides support for the recognition of O. canariensis as a sister species to O. patens and the separation of the Italian populations as a new subspecies of O. patens. Despite the high heterozygosity values found in all populations (ranging from 0.4 to 0.7), compatible with the tetraploid status of the species, small population sizes and reduced gene flow will be likely detrimental for the different populations in the long term, and we recommend immediate conservation actions to counteract further fragmentation and population decline.

Direct molecular evidence for the expression of the 5-HT4 receptor in rat colonocytes

2001 ◽  
Vol 120 (5) ◽  
pp. A171-A171
Author(s):  
M STONER ◽  
D YAGER ◽  
J KELLUM
Keyword(s):  
Molecular Evidence

A new species of Contomastix (Squamata, Teiidae) supported by total evidence, with remarks on diagnostic characters defining the genus

2019 ◽  
pp. 23-36
Author(s):  
Mario. R. Cabrera
Keyword(s):  
New Species ◽  
Geographic Distribution ◽  
Phylogenetic Reconstruction ◽  
Total Evidence ◽  
Molecular Evidence ◽  
Proximal Margin ◽  
Diagnostic Characters ◽  
Morphological Differences ◽  
A New Species ◽  
Molecular Characters

Formerly Cnemidophorus was thought to be the most speciose genus of Teiidae. This genus comprised four morphological groups that were later defined as four different genera, Ameivula, Aurivela, Cnemidophorus and Contomastix. The last appears as paraphyletic in a recent phylogenetic reconstruction based on morphology, but monophyletic in a reconstruction using molecular characters. Six species are allocated to Contomastix. One of them, C. lacertoides, having an extensive and disjunct geographic distribution in Argentina, Uruguay and Brazil. Preliminary analyses revealed morphological differences among its populations, suggesting that it is actually a complex of species. Here, we describe a new species corresponding to the Argentinian populations hitherto regarded as C. lacertoides, by integrating morphological and molecular evidence. Furthermore, we demonstrate that the presence of notched proximal margin of the tongue is a character that defines the genus Contomastix.

Molecular evidence of osteoblast dysfunction in elderly men with osteoporotic hip fractures

2014 ◽  
Author(s):  
Ursula Foger-Samwald ◽  
Alaghebandan Afarin ◽  
Janina Patsch ◽  
Doris Schamall ◽  
Sylvia Salem ◽  
...  
Keyword(s):  
Hip Fractures ◽  
Molecular Evidence ◽  
Elderly Men
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