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First record and evidence of an established population of the North American mud crab Dyspanopeus sayi (Brachyura: Heterotremata: Panopeidae) in the Western Mediterranean

AuthorsSchubart, Christoph D.; Guerao, Guillermo; Abelló, Pere
Issue Date3-Jun-2012
CitationThe Crustacean Society Summer Meeting - 10th Colloquium Crustacea Decapoda Mediterranea - Abstracts: 70 (2012)
AbstractIntroduction The panopeid crab Dyspanopeus sayi (Smith, 1869) is originally endemic to the Atlantic coast of North America. Within the last thirty years, it was involuntarily introduced into Britain, France and the Netherlands, and into the Adriatic and Black Sea. Material and methods Adult specimens of D. sayi were collected by hand and small beam trawls in Alfacs Bay, Ebro Delta (40º40' N; 0º40'E), located along the northeast Spanish Mediterranean coast (Catalonia: Tarragona) in November 2005, September 2006, and August 2010. Sampling depth ranged from 0.5-1.5 m. Mitochondrial DNA corresponding to 658 basepairs of the mitochondrial cytochrome subunit 1 (Cox1) region was amplified and sequenced from eight individuals. The sequences were aligned with available sequences in GenBank and used to construct a statistical parsimony network. Zoea I larvae hatched from one female and were preserved in 70% ethanol for morphological and morphometric comparisons. Results We herewith provide the first record of D. sayi from the western Mediterranean Sea. Occurrences of ovigerous females at different localities of the delta and in different years give evidence that the population is well established. Mitochondrial DNA confirms the species identity and indicates that the introduced population consists of at least three female lineages. The morphology of the zoea I is here described in detail and is similar to the one previously reported from native populations. Discussion D. sayi has a planktonic larval development which can last 14-27 days depending on the temperature The larval phase constitutes the dispersive stage and is crucial for the establishment of invading crustacean species with extended development as well as for its persistence and range extension of new populations. Nevertheless, natural introduction of D. sayi from North America or Britain into the western Mediterranean is unlikely, if not impossible, due to their planktonic larval duration and the present pattern of oceanographic currents and geographic barriers. We therefore propose a new human-mediated introduction of this species into the Ebro Delta, unless other, geographically intermediate, populations are discovered. The genetic results of four different haplotypes found in the five analyzed individuals from introduced populations (two from Venice Lagoon and three from Ebro Delta, one of which is shared) argue against colonization events based on single female lineages in both populations and suggest that no strong genetic bottleneck is to be expected in the European populations
DescriptionThe Crustacean Society Summer Meeting (TCSSM) - 10th Colloquium Crustacea Decapoda Mediterranea (CCDM), 3-7 June 2012, Athens, Greece
Appears in Collections:(ICM) Comunicaciones congresos
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