scholarly journals Population Genetic Structure Is Unrelated to Shell Shape, Thickness and Organic Content in European Populations of the Soft-Shell Clam Mya Arenaria

Genes ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 298 ◽  
Author(s):  
Michele De Noia ◽  
Luca Telesca ◽  
David L. J. Vendrami ◽  
Hatice K. Gokalp ◽  
Grégory Charrier ◽  
...  
Keyword(s):  
Population Structure ◽  
Genetic Structure ◽  
North Sea ◽  
Organic Content ◽  
Mya Arenaria ◽  
Shell Shape ◽  
Soft Shell Clam ◽  
The North ◽  
Soft Shell ◽  
The North Sea

The soft-shell clam Mya arenaria is one of the most ancient invaders of European coasts and is present in many coastal ecosystems, yet little is known about its genetic structure in Europe. We collected 266 samples spanning a latitudinal cline from the Mediterranean to the North Sea and genotyped them at 12 microsatellite loci. In parallel, geometric morphometric analysis of shell outlines was used to test for associations between shell shape, latitude and genotype, and for a selection of shells we measured the thickness and organic content of the granular prismatic (PR), the crossed-lamellar (CL) and the complex crossed-lamellar (CCL) layers. Strong population structure was detected, with Bayesian cluster analysis identifying four groups located in the Mediterranean, Celtic Sea, along the continental coast of the North Sea and in Scotland. Multivariate analysis of shell shape uncovered a significant effect of collection site but no associations with any other variables. Shell thickness did not vary significantly with either latitude or genotype, although PR thickness and calcification were positively associated with latitude, while CCL thickness showed a negative association. Our study provides new insights into the population structure of this species and sheds light on factors influencing shell shape, thickness and microstructure.

scholarly journals Genetic diversity of European populations of the invasive soft-shell clam Mya arenaria (Bivalvia)

2004 ◽  
Vol 84 (5) ◽  
pp. 1051-1056 ◽  
Author(s):  
Rafal Lasota ◽  
Herman Hummel ◽  
Maciej Wolowicz
Keyword(s):  
Genetic Diversity ◽  
North Sea ◽  
Mya Arenaria ◽  
Gulf Of Gdańsk ◽  
Soft Shell Clam ◽  
Low Level ◽  
The North ◽  
Soft Shell ◽  
The North Sea ◽  
Gulf Of Gdansk

The genetic diversity of the soft-shell clam Mya arenaria from seven locations in Europe (two stations in the southern Baltic Sea (the Gulf of Gdansk) and two in the North Sea (Veerse Meer and Oosterschelde), and three additional stations in the Denmark Straits and Bay of Biscay) was determined using starch gel electrophoresis of allozymes. The results showed a low level of genetic variability and a lack of genetic differentation among the populations studied. Basic polymorphism characteristics calculated for populations from the North Sea estuaries and the Gulf of Gdansk were: He 0·094–0·145, Ho 0·092–0·130, percentage of polymorphic loci 33 (0·95 criterion), mean number of alleles per locus 2·0–2·7. The mean value of FST was 0·0133 and not significant. It is concluded that in spite of a low level of genetic polymorphism the soft-shell clam is a successful colonizer. The genetic homogeneity among the populations reflects rapid population extension, alleles neutrality and a high gene flow.

Comparative study of ecophysiological and biochemical variation between the Baltic and North Sea populations of the invasive soft shell clam Mya arenaria (L. 1758)

2014 ◽  
Vol 43 (3) ◽  
Author(s):  
Rafał Lasota ◽  
Karolina Pierścieniak ◽  
Justyna Miąc ◽  
Maciej Wołowicz
Keyword(s):  
Respiration Rate ◽  
North Sea ◽  
Gonad Index ◽  
Condition Index ◽  
Mya Arenaria ◽  
The North ◽  
Soft Shell ◽  
Baltic Population ◽  
The North Sea ◽  
The Baltic

AbstractSeasonal variations of environmental factors, such as temperature and salinity, require metabolic acclimatization in sedentary benthic fauna distributed over a wide geographical range. The soft-shell clam Mya arenaria inhabits the coastal waters of the North Atlantic including North America and Europe. In Europe, M. arenaria populations are distributed from Iceland to the Mediterranean Sea, including the North Sea, the Baltic Sea and the Black Sea. Seasonal changes in physiological parameters (gonad index, condition index, biochemical composition and respiration rate) of M. arenaria from the Baltic Sea (the Gulf of Gdańsk, Poland), and the North Sea (Versee Meer, the Netherlands) were studied. The sex ratio of both populations did not differ from 1:1 and the seasonal gonad index was higher in the Baltic population. The average condition index changed seasonally at both studied sites, and was also higher in the Baltic population (except the autumn) compared to the North Sea. In both studied populations, the content of proteins, lipids and carbohydrates in the soft tissue followed the seasonal variations, and it was higher in the Baltic population. The respiration rate was lower in the Baltic population, and seasonal changes in the respiration rate seem to be correlated with changes in the water temperature. Based on the results obtained in the present study, we suggest that Mya arenaria is characterized by a large phenotypic plasticity and differences in the observed physiological traits are due to acclimatization to ambient environmental conditions.

GENETIC POPULATION STRUCTURE OFPSEUDO-NITZSCHIA PUNGENS(BACILLARIOPHYCEAE) FROM THE PACIFIC NORTHWEST AND THE NORTH SEA

2009 ◽  
Vol 45 (5) ◽  
pp. 1037-1045 ◽  
Author(s):  
Nicolaus G. Adams ◽  
Vera L. Trainer ◽  
Gabrielle Rocap ◽  
Russell P. Herwig ◽  
Lorenz Hauser
Keyword(s):  
Population Structure ◽  
Pacific Northwest ◽  
North Sea ◽  
Genetic Population Structure ◽  
Genetic Population ◽  
The North ◽  
The Pacific ◽  
The North Sea ◽  
Nitzschia Pungens

Population structure of harbour porpoises in the Baltic region: evidence of separation based on geometric morphometric comparisons

2012 ◽  
Vol 92 (8) ◽  
pp. 1669-1676 ◽  
Author(s):  
Anders Galatius ◽  
Carl Christian Kinze ◽  
Jonas Teilmann
Keyword(s):  
Population Structure ◽  
Baltic Sea ◽  
North Sea ◽  
Harbour Porpoise ◽  
Baltic Region ◽  
Geometric Morphometric ◽  
The North ◽  
The North Sea ◽  
The Baltic ◽  
Separate Population

The harbour porpoise is seriously depleted and threatened with extinction in the Baltic Sea. It is usually assumed that Baltic porpoises form a separate population unit, although the evidence for this has been disputed lately. Here, a 3-D geometric morphometric approach was employed to test a number of hypotheses regarding population structure of the harbour porpoise in the Baltic region. 277 porpoise skulls from Denmark, Sweden, Finland, Germany and Poland were measured with a suite of 3-D landmarks. Statistical analyses revealed highly significant shape differences between porpoises from the North Sea, Belt Sea and the inner Baltic Sea. A comparison of the directionalities of the shape vectors between these units found differences that cannot be attributed to a general, continual shape trend going from the North Sea to the inner Baltic Sea. These vectors indicate a morphological adaptation to the specific sub-areas. Such adaptation may be the result of the topographic peculiarities of the area with variable topography and shallow waters, e.g. in the Belt Sea porpoises, there may be a greater reliance on benthic and demersal prey. The present results show that isolation by distance alone is an unlikely explanation for the differences found within the Baltic region and thus support previously reported molecular indications of a separate population within the inner Baltic Sea.

scholarly journals Does population genetic structure support present management regulations of the northern shrimp (Pandalus borealis) in Skagerrak and the North Sea?

2014 ◽  
Vol 72 (3) ◽  
pp. 863-871 ◽  
Author(s):  
Halvor Knutsen ◽  
Per Erik Jorde ◽  
Enrique Blanco Gonzalez ◽  
Ole Ritzau Eigaard ◽  
Ricardo T. Pereyra ◽  
...  
Keyword(s):  
Genetic Structure ◽  
North Sea ◽  
Spatial Genetic Structure ◽  
Economic Value ◽  
Pandalus Borealis ◽  
The North ◽  
Management Regime ◽  
Northern Shrimp ◽  
Population Structuring ◽  
The North Sea

Abstract Population structuring in the northern shrimp (Pandalus borealis) in the North Sea area (including Fladen and Skagerrak) was studied by microsatellite DNA analyses. Screening 20 sample locations in the open ocean and Skagerrak fjords for nine loci revealed low, but significant genetic heterogeneity. The spatial genetic structure among oceanic samples of Skagerrak and the eastern North Sea was weak and non-significant, consistent with the current management regime of one single stock. However, Skagerrak fjord samples generally displayed elevated levels of genetic differentiation, and significantly so in several pairwise comparisons with other fjords and oceanic samples. Although the Skagerrak fjord populations are of less economic value, some of them are regulated separately (e.g. the Gullmarsfjord) and local stocks may prove important to uphold genetic variability and biocomplexity in a changing environment.

scholarly journals Microgeographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals

2009 ◽  
Vol 376 ◽  
pp. 213-225 ◽  
Author(s):  
EE Nielsen ◽  
PJ Wright ◽  
J Hemmer-Hansen ◽  
NA Poulsen ◽  
I Monro Gibb ◽  
...  
Keyword(s):  
Population Structure ◽  
North Sea ◽  
Gadus Morhua ◽  
The North ◽  
The North Sea
Sign in / Sign up

Export Citation Format

Share Document