Echinoderms in San Matías Gulf, Southwestern Atlantic Ocean

Abstract

Echinoderms are often of ecological importance in intertidal and subtidal waters, especially as predators and herbivores but also as prey. Several groups of echinoderms respond in a different way to environmental variables, contributing to some of the biodiversity patterns found along latitudinal gradient. This work listed the echinoderms species of San Matías Gulf surrounding the coast of Río Negro Province and analyzed the current state of knowledge of this group by previous works, collection items of the Museo Argentino de Ciencias Naturales BBernardino Rivadavia,â nd from samples taken since 2009 to the present. A total of 35 species of echinoderms corresponding to four classes were recorded. The 34.29 % corresponds to Asteroidea, 31.43 % to Ophiuroidea, 20 % to Echinoidea, and 14.28 % to Holothuroidea. Crinoidea has not been reported for San Matías Gulf. Asteroidea and Ophiuroidea were the most representative groups followed by Echinoidea and Holothuroidea, with only five species in the last class. About 30 % of the country's species are present in Río Negro Province. This high number of species may be due to the heterogeneity of environments that are possible to find in San Matías Gulf and a transition zone between the Magellanic and Argentine biogeographic provinces that can provide particular physical and climatic characteristics explaining as consequence the faunal composition.

Species composition of sea stars (Echinodermata: Asteroidea) in the Patagonian Argentinian deep sea, including seven new records: connectivity with sub-Antarctic and Antarctic fauna

“…Concerning the species composition in the study area, 64 species should be considered valid records in this area (Bernasconi 1937(Bernasconi , 1962a(Bernasconi , 1963(Bernasconi , 1964a(Bernasconi , 1966b(Bernasconi , 1973a(Bernasconi , 1973b(Bernasconi , 1979Gutt and Starmans 1998;Tablado and Maytia 1988;Orovitz and Tablado 1990;Bastida et al 1992;Clark and Downey 1992;Gutt et al 1999;Bremec et al 2000;Rios et al 2003;Zaixso 2004;Bertness et al 2006;Mutschke and Rios 2006;Mah 2011;Mah and Blake, 2012;Brogger et al 2013a;Souto et al 2014;Arribas et al 2016;Fraysse et al 2018;Moreau et al 2018Moreau et al , 2021Guillaumot et al 2020; National Museum of Natural History (NMNH: Research and Collections Information System, Smithsonian Institution), but only 41 were captured. Consequently, 23 of these species were not reported (Table 4; Fig.…”

“…Most studies on echinoderms from this area are restricted to the Argentinian shelf or near the slope, such as Bernasconi (1934Bernasconi ( , 1935Bernasconi ( , 1937Bernasconi ( , 1941aBernasconi ( , 1941bBernasconi ( , 1943Bernasconi ( , 1962aBernasconi ( , 1962bBernasconi ( , 1963Bernasconi ( , 1964aBernasconi ( , 1964bBernasconi ( , 1965Bernasconi ( , 1966aBernasconi ( , 1972Bernasconi ( , 1973aBernasconi ( , 1980, Tablado (1982), and Tablado and Maytia (1988), and more recent studies, such as Brogger et al (2010Brogger et al ( , 2013b, Martinez and Brogger (2012), Martinez et al (2015), Souto et al (2014), Brogger and O'Hara (2015), Di Giorgio et al (2015), Arribas et al (2016), Epherra et al (2015Epherra et al ( , 2017, Hunter et al (2016); Martinez (2016), Martinez and Penchaszadeh, (2017), Martinez et al (2018;, Wilkie and Brogger (2018), Carames et al (2019), Flores et al (2019), Martins and Tavares (2019), and Gil et al (2020). With regard to the class Asteroidea, few papers have been published recently: Romanelli and Tablado (2011), Pérez et al (2017),…”

Diversity, distribution and decreasing factor of intertidal invertebrate communities in the Pangandaran Turism, Indonesia

“…Invertebrate organisms with has actively moving -Echinodermata and Arthropod phyla-found random distribution category by Morisita index. Echinodermata is one of species found in the highest tides coastal [22,3] , capable of reproducing in the intertidal zone [54,40] and adapting to rock crevices as a hiding place from predators. Ophiocoma scolopendrine and Ophiocoma Erinaceus are the dominant species, they are opportunist species in coastal intertidal zones mixing hard substrates and sand.…”

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“…Invertebrate organisms with has actively moving -Echinodermata and Arthropod phyla-found random distribution category by Morisita index. Echinodermata is one of species found in the highest tides coastal [22,3] , capable of reproducing in the intertidal zone [54,40] and adapting to rock crevices as a hiding place from predators. Ophiocoma scolopendrine and Ophiocoma Erinaceus are the dominant species, they are opportunist species in coastal intertidal zones mixing hard substrates and sand.…”