Conservation genetics of the wood turtle (Glyptemys insculpta) in Quebec, Canada

2005 ◽  
Vol 83 (6) ◽  
pp. 765-772 ◽  
Author(s):  
Nathalie Tessier ◽  
Sébastien Rioux Paquette ◽  
François-Joseph Lapointe
Keyword(s):  
Phylogenetic Analyses ◽  
Population Declines ◽  
Conservation Units ◽  
The North ◽  
Glyptemys Insculpta ◽  
South Shore ◽  
Two Populations ◽  
St Lawrence River ◽  
Wood Turtle

Throughout its range, the long-term persistence of the wood turtle (Glyptemys insculpta Le Conte, 1830) is jeopardized by habitat perturbations and commercial collection. The main objective of this study was to acquire knowledge on the genetic structure of wood turtle populations within Quebec, where the species reaches the northernmost limit of its range, to identify proper conservation units. The six known populations in Quebec were genetically characterized using five microsatellite loci. Genetic analyses revealed high variability among all populations (HO ranging from 0.561 to 0.886), suggesting that past population declines have not yet affected their genetic diversity. Since populations are located on both shores of the St. Lawrence River, two colonization hypotheses were tested to determine whether the River acted as a dispersal route or as a barrier. Results of AMOVA tests, phylogenetic analyses, and assignment tests demonstrated the clear distinction between populations from both shores, and three genetically different units were identified: the two populations on the north shore and a single homogenous group on the south shore.

scholarly journals Genome-wide SNPs redefines species boundaries and conservation units in the freshwater mussel genus Cyprogenia of North America

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kyung Seok Kim ◽  
Kevin J. Roe
Keyword(s):  
Phylogenetic Analyses ◽  
Freshwater Mussel ◽  
Conservation Strategies ◽  
Nucleotide Polymorphisms ◽  
Conservation Units ◽  
Genetic Structuring ◽  
The North ◽  
Snp Data ◽  
Genome Wide ◽  
Significant Difference

AbstractDetailed information on species delineation and population genetic structure is a prerequisite for designing effective restoration and conservation strategies for imperiled organisms. Phylogenomic and population genomic analyses based on genome-wide double digest restriction-site associated DNA sequencing (ddRAD-Seq) data has identified three allopatric lineages in the North American freshwater mussel genus Cyprogenia. Cyprogenia stegaria is restricted to the Eastern Highlands and displays little genetic structuring within this region. However, two allopatric lineages of C. aberti in the Ozark and Ouachita highlands exhibit substantial levels (mean uncorrected FST = 0.368) of genetic differentiation and each warrants recognition as a distinct evolutionary lineage. Lineages of Cyprogenia in the Ouachita and Ozark highlands are further subdivided reflecting structuring at the level of river systems. Species tree inference and species delimitation in a Bayesian framework using single nucleotide polymorphisms (SNP) data supported results from phylogenetic analyses, and supports three species of Cyprogenia over the currently recognized two species. A comparison of SNPs generated from both destructively and non-destructively collected samples revealed no significant difference in the SNP error rate, quality and amount of ddRAD sequence reads, indicating that nondestructive or trace samples can be effectively utilized to generate SNP data for organisms for which destructive sampling is not permitted.

Preliminary interpretation of the first refraction arrivals in Gaspé from shots in Labrador and Quebec

1969 ◽  
Vol 6 (4) ◽  
pp. 771-774 ◽  
Author(s):  
Douglas S. Rankin ◽  
Ravi Ravindra ◽  
David Zwicker
Keyword(s):  
Upper Mantle ◽  
Arrival Time ◽  
The South ◽  
North Shore ◽  
The North ◽  
A Value ◽  
South Shore ◽  
Compressional Velocity ◽  
St Lawrence River

Previous work in the Gulf of St. Lawrence has yielded an unusually high upper-mantle compressional velocity. In the Gaspé area a more recent determination has yielded a value of 8.75 ± 0.20 km/s for an unreversed profile. The arrival time at a station on the north shore of the St. Lawrence River suggests that there is no major difference in velocity and depth relative to the south shore.

Phylogeography of the Australian dunnart Sminthopsis crassicaudata (Marsupialia : Dasyuridae)

2000 ◽  
Vol 48 (5) ◽  
pp. 461 ◽  
Author(s):  
S. J. B. Cooper ◽  
M. Adams ◽  
A. Labrinidis
Keyword(s):  
Conservation Management ◽  
Phylogenetic Analyses ◽  
Allozyme Data ◽  
Evolutionarily Significant Units ◽  
Sminthopsis Crassicaudata ◽  
Control Region Sequences ◽  
Two Populations ◽  
Maternal Gene ◽  
Mtdna Haplotype

Analyses of mitochondrial DNA (mtDNA) and allozymes are used to investigate the population genetic structure, phylogeography and systematics of the fat-tailed dunnart, Sminthopsis crassicaudata. Phylogenetic analyses of control region sequences reveal the presence of two major mtDNA haplotype clades. A survey of the distribution of the two clades using diagnostic restriction endonucleases shows that one clade is restricted to southeast Australia whereas the second clade occupies the remaining central to western range of S. crassicaudata. Allozyme electrophoresis also shows concordant patterns of population structure, with significant differences in allele frequency at three loci between populations in the southeast and northwest. Together, the mtDNA and allozyme data provide evidence that S. crassicaudata consists of two Evolutionarily Significant Units (ESUs). The distribution of each ESU is not concordant with the distribution of the subspecies of S. crassicaudata, and we propose that the current subspecies classification neither reflects the major genetic subdivisions present within S. crassicaudata nor would be appropriate for any future conservation management. The level of divergence between mtDNA clades (3.4%) is indicative of cladogenesis in the Pleistocene and reflects a long-term barrier to maternal gene flow between these two populations. One potential historical barrier was Lake Bungunnia, which persisted in the Murray basin over much of the Pleistocene.

Sedimentary processes and the evolution of the distal bayside of Long Point, Lake Erie

1994 ◽  
Vol 31 (9) ◽  
pp. 1461-1473 ◽  
Author(s):  
Robin G. D. Davidson-Arnott ◽  
Heather E. Conliffe Reid
Keyword(s):  
Lake Erie ◽  
Great Depth ◽  
Sediment Supply ◽  
Aerial Photographs ◽  
Lake Levels ◽  
Wave Refraction ◽  
The North ◽  
South Shore ◽  
High Lake Levels

Long Point spit, on the north shore of Lake Erie, is >40 km long and presently building into water that is >40 m deep. Annual sediment supply to the spit is estimated to be 1.0 × 106 m3∙a−1 and is derived from the erosion of cohesive bluffs along more than 90 km of shoreline to the west. The shoreline of the distal bayside consists of narrow barriers that connect the ends of dune ridges and enclose interdune ponds and swales. Unlike most barrier spits, the distal end shows little evidence of the formation of dune recurves, and the shoreline of the bayside, rather than fronting a protected bay, is exposed to waves generated by northeast winds blowing over a fetch >100 km. Results of wave refraction analysis indicate that because of the great depth of water at the tip, there is almost no refraction of the dominant westerly and southwesterly waves around the distal end, thus inhibiting the formation of recurves. Net sediment transport on the distal bayside is towards the distal end of the spit. The result is the development of a narrow spit platform extending the spit directly into the deepest part of Lake Erie. All sediment reaching the distal end along the exposed south shore is transported onto this platform and none reaches the distal bayside.The negative sediment budget on the distal bayside results in transgression of the shoreline through truncation of the dune ridges, and overwash and breaching of the small barriers. Historical aerial photographs show that most of the overwash and breaching occurs during periods of long-term high lake levels, with the barriers being rebuilt landward of their former position during the following periods of lower lake levels. Progradation of the south shore at the distal end is thus partly counterbalanced by the transgression of the bayside.

Distribution of Enteric Bacteria in the Quebec City Section of the St-Lawrence River

1974 ◽  
Vol 9 (1) ◽  
pp. 107-114
Author(s):  
Ronald E. Simard ◽  
John A. Zee
Keyword(s):  
Fecal Coliform ◽  
Enteric Bacteria ◽  
Quebec City ◽  
Klebsiella Pneumonia ◽  
North Shore ◽  
The North ◽  
South Shore ◽  
Total Bacteria ◽  
St Lawrence River ◽  
Made In

Abstract During the summer of 1973, a survey was made in order to establish the level of enteric bacteria in the sediments and water of the St-Lawrence River. In the sediments, the number of total bacteria, yeast and mold fluctuates from station to station and with the tide. Higher counts of total and fecal coliform were encountered on the north shore than on the south shore resulting from Quebec City sewerage. The number of fecal bacteria decreased when approaching the Gulf and their number was higher at rising tide. The main species encountered were Klebsiella pneumonia, Salmonella enteridis and Escherichia spp.

scholarly journals Genome-Wide SNPs Redefines Species Boundaries and Conservation Units in the Freshwater Mussel Genus Cyprogenia of North America

2021 ◽  
Author(s):  
Kevin Roe ◽  
Kyung Seok Kim
Keyword(s):  
Phylogenetic Analyses ◽  
Freshwater Mussel ◽  
Conservation Units ◽  
Genetic Structuring ◽  
The North ◽  
Distinct Evolutionary Lineage ◽  
Snp Data ◽  
Genome Wide ◽  
Significant Difference ◽  
Tree Inference

Abstract Detailed information on species delineation and population genetic structure is a prerequisite for designing effective restoration and conservation strategies for imperiled organisms. Phylogenomic and population genomic analyses based on genome-wide ddRAD-Seq data has identified three allopatric lineages in the North American freshwater mussel genus Cyprogenia. Cyprogenia stegaria is restricted to the Eastern Highlands and displays little genetic structuring within this region. However, two allopatric clusters of C. aberti in the Ozark and Ouachita highlands exhibit substantial levels (mean FST = 0.120) of genetic differentiation and each warrants recognition as a distinct evolutionary lineage. Lineages of Cyprogenia in the Ouachita and Ozark highlands are further subdivided reflecting structuring at the level of river systems. Species tree inference and species delimitation in a Bayesian framework using SNP data supported results from phylogenetic analyses, which favors recognizing three species of Cyprogenia over the currently recognized two species.A comparison of SNPs generated from both destructively and non-destructively collected samples revealed no significant difference in the SNP error rate, quality and amount of ddRAD sequence reads, indicating that nondestructive or trace samples can be effectively utilized to generate SNP data for organisms for which destructive sampling is not permitted.

Lateral variations in upper crustal structure below the La Malbaie area from slowness, azimuth, and traveltime measurements of telleseisms

1977 ◽  
Vol 14 (10) ◽  
pp. 2284-2293 ◽  
Author(s):  
D. J. Hearty ◽  
R. F. Mereu ◽  
C. Wright
Keyword(s):  
Precambrian Basement ◽  
Precambrian Rock ◽  
The South ◽  
Local Seismicity ◽  
North Shore ◽  
The North ◽  
South Shore ◽  
Lateral Variations ◽  
Teleseismic Events ◽  
St Lawrence River

A temporary seismic network located in the La Malbaie region of eastern Quebec during the summer of 1974 for studying the local seismicity of the area was used as a seismic array to measure directly the slowness and azimuth of the P arrivals from 18 teleseismic events. A consistent bias in the arrival vectors was observed for rays approaching the array from the south (i.e. azimuths 181°–227°). This bias can be explained by a thickening of sedimentary strata beneath the south shore of the St. Lawrence River as opposed to the outcropping Precambrian basement rock on the north shore. The sedimentary accumulation can be interpreted in terms of a sloping interface located under the network between sediments and Precambrian rock or a thick horizontal sedimentary layer underlying the south shore of the St. Lawrence River.

Long-term Cyclic Variations of Prominences, Green and Red Coronae over Solar Cycles

2000 ◽  
Vol 179 ◽  
pp. 201-204
Author(s):  
Vojtech Rušin ◽  
Milan Minarovjech ◽  
Milan Rybanský
Keyword(s):  
Emission Lines ◽  
High Latitudes ◽  
Green Line ◽  
Solar Cycles ◽  
The South ◽  
Coronal Emission ◽  
Local Maxima ◽  
The North ◽  
Cyclic Variations

AbstractLong-term cyclic variations in the distribution of prominences and intensities of green (530.3 nm) and red (637.4 nm) coronal emission lines over solar cycles 18–23 are presented. Polar prominence branches will reach the poles at different epochs in cycle 23: the north branch at the beginning in 2002 and the south branch a year later (2003), respectively. The local maxima of intensities in the green line show both poleward- and equatorward-migrating branches. The poleward branches will reach the poles around cycle maxima like prominences, while the equatorward branches show a duration of 18 years and will end in cycle minima (2007). The red corona shows mostly equatorward branches. The possibility that these branches begin to develop at high latitudes in the preceding cycles cannot be excluded.

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