scholarly journals Weak genetic structure despite strong genomic signal in lesser sandeel in the North Sea

2019 ◽  
Vol 13 (2) ◽  
pp. 376-387 ◽  
Author(s):  
Belén Jiménez‐Mena ◽  
Alan Le Moan ◽  
Asbjørn Christensen ◽  
Mikael Deurs ◽  
Henrik Mosegaard ◽  
...  
Keyword(s):  
Genetic Structure ◽  
North Sea ◽  
The North ◽  
The North Sea ◽  
Genomic Signal

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 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.

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