Influence of the genetic structure of the red and blue shrimp, <i>Aristeus antennatus</i> (Risso, 1816), on the sustainability of a deep-sea population along a depth gradient in the western Mediterranean

Abstract

SUMMARY:The red and blue shrimp, Aristeus antennatus, inhabits deep shelf waters in the Mediterranean Sea, where the shallower portion of its distribution supports a large commercial fishery. Recent prospecting surveys in the western Mediterranean have detected virgin stocks dwelling at more than 1000 m, but the extent of gene flow between the exploited shallowdwelling stock and the deep-dwelling stock is unknown. To investigate the genetic structure of the population and estimate the depth component of gene flow, a portion of the mitochondrial DNA 16S gene (547 pb) was sequenced for 321 individuals from four different depths (350, 700, 1100 and 1500 m) at a location in the Catalan Sea. Haplotype and nucleotide diversity values were low and did not significantly differ across depths. Analysis of molecular variance showed no significant genetic differences between depths. Mismatch distribution and neutrality tests indicated that A. antennatus has undergone recent demographic expansion in the two shallowest layers. Our results suggest that the species is genetically structured as a sort of metapopulation in which gene flow that occurs during the larval and juvenile stages, when larvae are carried downstream and juveniles are carried upstream by cascading, plays an important role in the resilience of the exploited layers.Keywords: red and blue shrimp, Aristeus antennatus, mtDNA, 16S rDNA, gene flow, depth distribution, Western Mediterranean, metapopulation. RESUMEN: Influencia de la estructura genética de la gamba rosada, Aristeus AntennAtus (Risso, 1816) en la sostenibilidad de su población a través del gradiente de profundidad en el mediterráneo occidental. -La gamba rosada Aristeus antennatus habita las aguas profundas del Mar Mediterráneo, donde los stocks de aguas más someras soportan una importante presión pesquera. Recientes campañas de prospección llevadas a cabo en el Mediterráneo Occidental han detectado stocks vírgenes a más de 1000 m de profundidad, pero se desconoce el flujo génico entre estos stocks y los menos profundos. Con el fin de investigar la estructura genética de dichos stocks, y estimar el componente de flujo génico entre ellos, se secuenció una porción de ADN mitocondrial, el gen 16S (547 bp) en 321 individuos procedentes de cuatro profundidades (350, 700, 1100 y 1500 m) de una localidad del mar Catalán. Los valores de diversidad haplotípica y nucleotídica fueron bajos y no resultaron significativos entre profundidades. El análisis de la varianza molecular tampoco mostró diferencias significativas entre profundidades. La distribución mismatch y los tests de neutralidad indicaron que A. antennatus tuvo una expansión demográfica reciente en las dos fracciones menos profundas. Nuestros resultados sugieren que la gamba rosada está genéticamente estructurada como una metapoblación donde el flujo génico ocurre, en parte, mediante la deriva de larvas y de juveniles, cuando éstos últimos aparecen en las zonas menos profundas en los períodos siguientes al cascading. Este aspecto juega un rol importa...

Genetic structure and population connectivity of the blue and red shrimp Aristeus antennatus

“…The surface Northern Current and the circulation of deeper waters in the great cyclonic gyres of the WM, such as the Lion Gyre, could contribute to the horizontal and vertical population admixture in the WM Basin 21,41 . Moreover, periodical cascading events in the Gulf of Lion propagate shelf waters in submarine canyons at depths >2,000 m 1 .…”

“…The blue and red shrimp Aristeus antennatus (Risso, 1816) (Penaeoidea, Aristeidae) is a demersal marine decapod that inhabits the muddy bottoms of the continental slope along submarine canyons 1 . The species is distributed throughout the Mediterranean Sea, in the Atlantic Ocean (AO) waters adjacent to the Strait of Gibraltar from Portugal to Cape Verde, and in the western Indian Ocean (IO) from South Africa across the Mozambique Channel, Zanzibar, and the Maldives Islands; more recently, its presence off the coast of Brazil has been suggested 2 .…”

Morphological identification and molecular confirmation of the deep-sea blue and red shrimpAristeus antennatuslarvae

“…They had been collected, preserved and their DNA amplified and the resulting sequences were therefore available for comparison. The GenBank accession numbers are – for 16S rDNA (Sardà et al, 2010) and for Cytochrome Oxidase I (COI) (Roldán et al, 2009). In the case of Gennadas elegans , two adult individuals were selected from a sampling cruise in May 2010 in the Mediterranean Sea.…”

“…In order to confirm the identification of the larvae, simultaneous comparisons were done with reference sequences from adults of six species of dendrobranchiate decapod crustaceans: Aristeus antennatus , Aristaeomorpha foliacea , Gennadas elegans , Gennadas valens , Parapenaeus longirostris and Penaeus ( Melicertus ) kerathurus . The corresponding GenBank accession numbers are: – (Sardà et al, 2010), – (Roldán et al, 2017), (Bracken-Grissom et al, 2012), (Pascoal et al, 2008) and (Zitari-Chatti et al, 2009), respectively.…”

A review of biological patterns of the blue-red shrimp <em>Aristeus antennatus</em> in the Mediterranean Sea: a case study of the population of Antalya Bay, eastern Mediterranean Sea

“…These aspects include fishery (Demestre and Lleonart 1993, Cartes and Demestre 2003, Gorelli et al 2016, biology (Orsi Relini and Relini 1998, García-Rodríguez 2003, Cartes et al 2008, ecology (D'Onghia et al 1997, Relini et al 2000, D'Onghia et al 2009), physiology (Puig et al 2001) and genetics (Sardà et al 2010, Roldán et al 2009). In the eastern Mediterranean (eastern Ionian Sea), some studies have also been carried out in the ecology (Papaconstantinou andKapiris 2001, Guillen et al 2012), biology (Kapiris 2004, Kapiris andThessalou-Legaki 2009) and fishery (Deval et al 2009).…”