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Abstract
The invasive softshell clam (Mya arenaria Linnaeus, 1758) is native to the northwestern region of the Atlantic Ocean. This species has been introduced in the northeast Pacific and along the European coasts, due to intense naval transports and aquaculture, and it is now present in all the European seas. In this paper we describe seven new microsatellite loci for Mya arenaria. The isolated loci are polymorphic with a number of alleles per locus between 6 and 14. The observed and expected heterozygosities ranged from 0.417 to 0.951, and from 0.643 to 0.895, with an average of 0.716 and 0.775, respectively. These microsatellite markers should be useful in analyzing this species’ genetic diversity, which could explain various processes of its invasion history.
Highlights
Mya arenaria is one of the most important commercial clams in the USA, being used as a food source [1]
M. arenaria has reinvaded the eastern regions of the Atlantic, most likely as a result of human activity, and it is thought that the re-invasion of the European coasts has begun somewhere in the thirteenth century as a result of Viking expeditions [3]
In this paper we describe another seven new highly polymorphic microsatellite loci which can be used in analyzing the genetic variability of
Summary
Mya arenaria is one of the most important commercial clams in the USA, being used as a food source [1]. During the Pleistocen glaciation, it is thought that all the softshell clam populations died out, except the one from the north-west of the Atlantic [2]. After this event, M. arenaria has reinvaded the eastern regions of the Atlantic, most likely as a result of human activity, and it is thought that the re-invasion of the European coasts has begun somewhere in the thirteenth century as a result of Viking expeditions [3]. The microsatellite loci available for molluscs species are still limited [4] and until now, studies of genetic variation on M. arenaria were conducted using only allozymes [5] and COI sequences [6].
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