Peromyscus populations and their Cuterebra parasites display congruent phylogeographical structure

Parasitology ◽  
2005 ◽  
Vol 131 (2) ◽  
pp. 237-245 ◽  
Author(s):  
S. NOËL ◽  
B. ANGERS ◽  
F.-J. LAPOINTE
Keyword(s):  
Parasite Species ◽  
Isolation By Distance ◽  
Deer Mouse ◽  
Genetic Distances ◽  
Limited Sample ◽  
The North ◽  
Mitochondrial Sequences ◽  
North And South ◽  
White Footed Mouse ◽  
St Lawrence River

The relationships between populations of the Deer Mouse (Peromyscus maniculatus) and the White-footed Mouse (P. leucopus) and their respective Cuterebra parasites were examined. Population genetic structure of hosts and parasites was inferred using cytochrome oxidase mitochondrial sequences of specimens from 7 populations. Genetic analyses revealed that isolation-by-distance applies for P. maniculatus and its associated parasite (C. grisea). A significant correlation was also observed between the genetic distances of these host and parasite species. Furthermore, populations of P. maniculatus and C. grisea from the North and South shores of the St Lawrence River were found to be significantly different. This structure may be explained by the St Lawrence River being a dispersal barrier for both species. A robust analysis of the other species pair (P. leucopus and C. fontinella) could not be performed because of limited sample sizes.

scholarly journals Study on haplotype diversity of Y-STR loci of the Kinh population in Vietnam

2017 ◽  
Vol 33 (2S) ◽  
Author(s):  
Trinh Tuan Toan ◽  
Vu Le Loi ◽  
Ha Quoc Khanh ◽  
Nguyen Quang Vinh ◽  
Nguyen Quang Huy
Keyword(s):  
Haplotype Diversity ◽  
Genetic Distances ◽  
Statistical Validation ◽  
Finger Nail ◽  
Str Loci ◽  
The North ◽  
Migration History ◽  
Close Relationship ◽  
Forensic Case ◽  
North And South

The study was carried out to determine allele frequencies of Y-STRloci in order to apply in the statistical validation of forensic case and paternal lineages. 17 Y-STR loci were co-amplified (including: DYS19, DYS389I, DYS389II, DYS390, DYS391, DYS392, DYS393, DYS385, DYS437, DYS438, DYS439, DYS448, DYS456, DYS458, DYS635, and GATAH4) using DNA genome extracted from blood, hair root and finger nail samples of 205 unrelated men of Kinh population in the North and South of Vietnam. The studied population shows that a relatively close relationship between the Jiangxi (Han) and Jiangsu (Han) populations in China and the Han population in Taiwan. Compared to other population with geographic locations far removed from Vietnam and historically and culturally diverse, there are significant differences as with Americans (Rst = 0.3836, P <0.0001); The Germans (Rst = 0.3562, p = -1.0000); The Romans (Rst = 0.2918, p = -1.0000) or Ethiopian (Rst = 0.3139, p = -1.0000) and particularly significant differences with Nigerians (Rst = 0.5084, p = -1.0000). The genetic diversity indexes at each locus and the haplotypes were examined; Genetic distances between the King population in this study and neighboring populations and geographically remote populations are consistent with the migration history.  

Crustal studies in the La Malbaie Region, Quebec

1980 ◽  
Vol 17 (4) ◽  
pp. 478-490 ◽  
Author(s):  
J. A. Lyons ◽  
D. A. Forsyth ◽  
J. A. Mair
Keyword(s):  
Deep Structure ◽  
Numerical Models ◽  
Moho Depth ◽  
The North ◽  
Crustal Velocity ◽  
Time Distance ◽  
Microseismic Activity ◽  
A Minor ◽  
North And South ◽  
St Lawrence River

The results of three seismological investigations of the crust in the seismically active La Malbaie Region are reported. First arrivals from a reversed reflection–refraction profile within the Charlevoix structure indicate a uniform Pg velocity of 6.08 ± 0.04 km/s. Secondary arrivals forming discontinuous, sometimes arcuate segments on the record sections are interpreted as subcritical reflections from structural contortions related to impact of the Charlevoix meteorite. A coherent event at 14 s may signal reflection from the M-discontinuity near 45 km depth.Analysis of travel times from calibration shots recorded by a network of stations spanning the St. Lawrence River in terms of time–distance profiles, travel time residuals, and numerical models provides excellent support for a model of the Precambrian–Paleozoic contact striking along the north shore and dipping to the southeast about 20° beneath the wedge of 5.5 km/s sediments.Unreversed profiles obtained by recording timed Thetford Mines blasts across a similar network suggests a comparable deep structure beneath the north and south shores, with average crustal velocities of 6.8 and 6.7 km/s, respectively. A minor mid-crustal discontinuity is suggested, and Moho depth is estimated at 42–43 km.The 6.2 km/s upper crustal velocity found for the crater and immediately surrounding area is anomalously low compared to the 6.4–6.5 km/s reported for the eastern shield region. Structural lineations gleaned from satellite imagery suggest an elongated area of impact-related disruption much larger than previously recognized. This expanded area of crustal weakening encompasses and may partially explain the zone of continuing microseismic activity, as well as the low upper crustal velocity of the La Malbaie Region.

scholarly journals Population genetics reveal patterns of natural colonisation of an ecologically and commercially important invasive fish

2021 ◽  
pp. 1-15
Author(s):  
Ciar O’Toole ◽  
Karl P. Phillips ◽  
Caroline Bradley ◽  
Jamie Coughlan ◽  
Eileen Dillane ◽  
...  
Keyword(s):  
Salmo Trutta ◽  
Isolation By Distance ◽  
Dispersal Patterns ◽  
Genetic Population ◽  
The North ◽  
Brown Trout Salmo Trutta ◽  
Population Structuring ◽  
Nj Tree ◽  
Commercially Important ◽  
North And South

Although historical records of introductions that trigger successful biological invasions are common, subsequent patterns of dispersal and colonisation routes are unclear. We use microsatellites to examine genetic population structuring of established invasive brown trout (Salmo trutta) populations in Newfoundland, Canada, for evidence of “natural” dispersal, human-mediated introductions, and colonisation routes. We also explored ancestry of contemporary populations relative to presumed progenitors. Results analysed using STRUCTURE, DAPC, a NJ tree and FST comparisons support records of historical introductions; current Newfoundland populations are largely descended from Scottish stock, with St. John’s the primary introduction site. Subsequent dispersal of these trout was facilitated principally by anadromy, largely consistent with a classic stepping-stone model, with significant isolation-by-distance. With one exception, dispersal along the north and south coasts of the Avalon peninsula appears to be natural and independent, involving stochastic processes resulting in unique outcomes for population composition. This study is a good example of dispersal patterns during a contemporary invasion underscoring the potential for non-anadromous founders to re-express anadromy, facilitating colonization of distant sites.

Preliminary results of the study on the reasons of the Hai Hau erosion phenomenon

2007 ◽  
Vol 29 (3) ◽  
pp. 415-426
Author(s):  
Pham Van Ninh ◽  
Phan Ngoc Vinh ◽  
Nguyen Manh Hung ◽  
Dinh Van Manh
Keyword(s):  
Mathematical Modeling ◽  
Historical Data ◽  
Middle Part ◽  
Red River ◽  
Erosion Process ◽  
Red River Delta ◽  
The North ◽  
Severe Erosion ◽  
North And South ◽  
Very High

Overall the evolution process of the Red River Delta based on the maps and historical data resulted in a fact that before the 20th century all the Nam Dinh coastline was attributed to accumulation. Then started the erosion process at Xuan Thuydistrict and from the period of 1935 - 1965 the most severe erosion was contributed in the stretch from Ha Lan to Hai Trieu, 1965 - 1990 in Hai Chinh - Hai Hoa, 1990 - 2005 in the middle part of Hai Chinh - Hai Thinh (Hai Hau district). The adjoining stretches were suffered from not severe erosion. At the same time, the Ba Lat mouth is advanced to the sea and to the North and South direction by the time with a very high rate.The first task of the mathematical modeling of coastal line evolution of Hai Hau is to evaluate this important historical marked periods e. g. to model the coastal line at the periods before 1900, 1935 - 1965; 1965 - 1990; 1990 - 2005. The tasks is very complicated and time and working labors consuming.In the paper, the primarily results of the above mentioned simulations (as waves, currents, sediments transports and bottom - coastal lines evolution) has been shown. Based on the obtained results, there is a strong correlation between the protrusion magnitude and the southward moving of the erosion areas.

Studies of Ptiliidae (Coleoptera) in the Spirit Collection of the Natural History Museum, London 2: New species and records from P. Hammond's visit to New Zealand in 1983–84

2018 ◽  
Vol 154 (3) ◽  
pp. 179-196
Author(s):  
Michael Darby
Keyword(s):  
New Species ◽  
New Zealand ◽  
Natural History ◽  
Natural History Museum ◽  
History Museum ◽  
The North ◽  
Three New Species ◽  
North And South

Some 2,000 Ptiliidae collected in the North and South Islands of New Zealand in 1983/1984 by Peter Hammond of the Natural History Museum, London, are determined to 34 species, four of which are new to the country. As there are very few previous records, most from the Auckland district of North Island, the Hammond collection provides much new distributional data. The three new species: Nellosana insperatus sp. n., Notoptenidium flavum sp. n., and Notoptenidium johnsoni sp. n., are described and figured; the genus Ptiliodes is moved from Acrotrichinae to Ptiliinae, and Ptenidium formicetorum Kraatz recorded as a new introduction. Information is provided to aid separation of the new species from those previously recorded.

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