Nueva distribución de Paralomis birsteini Macpherson, 1988 en aguas antárticas (Anomura, Lithodidae, Lithodinae)

Abstract

RESUMEN: Se analizan 88 ejemplares de centolla capturados con trampas en aguas profundas del Océano Austral, próximas al continente Antártico (Subáreas estadísticas 88.3, 48.1 y 48.2). Los ejemplares de Paralomis birsteini Macpherson, 1988, se capturaron en los montes submarinos de Gerlache y en los alrededores de la isla Pedro I, en el mar de Bellingshausen; en el talud continental al oeste de la Península Antártica y en el Mar de Escocia, al norte de las islas Orcadas del Sur, en profundidades entre 621 y 1876 m. Los especímenes presentaron longitudes cefalotorácicas entre 50,8 y 110,2 mm y peso promedio de 249 g. Los rendimientos, respecto al total de trampas utilizadas en cada subárea, correspondieron a 87,3 g/trampa en la Subárea 88.3; 2,2 g/trampa en la Subárea 48.1; y, 548,8 g/trampa en la Subárea 48.2. Además, se discute la presencia de la familia Lithodidae en el océano Austral.

Encounter of lithodid crab Paralomis birsteini on the continental slope off Antarctica, sampled by ROV

“…P. birsteini now appears to be widespread in the Bellingshausen Sea and so far remains the most commonly recorded Antarctic lithodid species south of 60°S (Arana and Retamal 1999;Thatje and Arntz 2004;Ahyong and Dawson 2006).…”

“…The increased records of lithodid crabs in deeper waters and on seamounts surrounding the Antarctic continent in recent years raised the question of established lithodid crab populations in the Southern Ocean (López Abellan and Balguerías 1993; Klages et al 1995;Arana and Retamal 1999;Thatje and Arntz 2004;Thatje and Lörz 2005). Although the origin and especially the timescale of lithodid radiation in the Southern Ocean remains obscure , there is consensus that these largest arthropods currently inhabiting the oceans are the most likely candidates to invade the shallow waters of the Antarctic continental shelf under conditions of climate change (Meredith and King 2005;.…”

Biology of the king crab Paralomis birsteini on the continental slope off the western Antarctic Peninsula

“…Warming waters, however, may soon allow predatory lithodids to return to shelf habitats, and the geologically sudden increase in durophagous predation could have important consequences for benthic food webs (Thatje et al 2005;Aronson et al 2007). Lithodids were first recorded on the continental slope off the WAP in 1998 (Arana and Retamal 1999). Seafloor-imaging studies have since revealed that populations of the lithodid Paralomis birsteini are widespread on the slope off the WAP, with densities of *4500 indÁkm -2 reported at depths of 1100-1500 m off Marguerite Bay (Aronson et al 2015).…”

“…Seafloor-imaging studies have since revealed that populations of the lithodid Paralomis birsteini are widespread on the slope off the WAP, with densities of *4500 indÁkm -2 reported at depths of 1100-1500 m off Marguerite Bay (Aronson et al 2015). Individual lithodids have been recorded as shallow as 621 m off the sub-Antarctic islands and at 721 m on the Antarctic slope, close to the shelf-break at *500 m (Arana and Retamal 1999;Aronson et al 2015). Adults, juveniles, exuviae, and pairs of individuals in precopulatory embrace were observed in images, strongly suggesting the population is well established and reproductively viable (Aronson et al 2015).…”

A new species of the genus Paralomis (Crustacea: Decapoda: Lithodidae) from the Spiess seamount near Bouvet Island (Southern Ocean), with notes on habitat and ecology

“…1) and present examination of the male holotype (NHM 88.33) Island area (Thatje and Arntz 2004, also unpublished record based on the collections of the Zoological Institute, St. Petersburg), Peter 1 Islands (Arana and Retamal 1999). The second together with more eastward records of P. birsteini near the Antarctic Peninsula and the South Orkney Islands (Arana and Retamal 1999) need to be checked in order to be sure that there is no confusion with the related species P. formosa. This summary of the distribution shows that there is not a single Antarctic-Subantarctic homogeneous lithodid fauna, but the species assemblages change from west to east around the area.…”