Distribution and ecology of deep-water mollusks from the continental slope, southeastern Gulf of California, Mexico

The Relationship between Mollusks and Oxygen Concentrations in Todos Santos Bay, Baja California, Mexico

“…The differences found could be due to the identification level (genus) while other studies have been done to species level. Some research has described malacological fauna and DO; for example, Zamorano et al [26] described a segregation of mollusk species from the range of 0.04 to 2.20 mL L −1 DO concentrations in the Gulf of California, Mexico, where bivalves dominated in low DO concentrations and the scaphopod Dentalium agassizi was present in almost all the ranges of DO measured. Another work found two groups of species but only gastropods were related to a DO gradient in Guanabara Bay, Rio de Janeiro, Brazil; in this case, the first group was conformed by Natica pusilla, Acteocina bidentate, Olivella minuta, and Turbonilla sp., while the second group was conformed by Anachis isabellei, Heleobia australis, and Nassarius vibex [41].…”

“…Most mollusks studies in the Mexican Pacific Ocean are related to species of commercial importance and some pollution indicators [19][20][21][22][23], and few studies have dealt with noncommercial species, for example, in the coastal and continental shelf of Jalisco and Colima and the Gulf of Tehuantepec [24,25]. Recently, other studies of the malacological fauna in the region of Baja California were published [26][27][28]. One of these studies found 122 genera and 202 species; 11 endemic species of Gastropoda and Polyplacophora were collected [28].…”

A new species of deep-water Holothuroidea (Echinodermata) of the genus <i>Synallactes</i> from off western Mexico

“…As in the case of many species of Mollusks and Crustacea collected in deep water along the west coast of Mexico, at the edge of the Oxygen Minimum Zone (see Hendrickx, 2001;Zamorano et al, 2006), Synallactes virgulasolida occurs in severe hypoxic conditions.…”

Distribution of the deep-sea genus Bathypterois (Pisces: Ipnopidae) in the Eastern Central Pacific

“…The OMZ of the Pacific Ocean is the most pronounced worldwide (Fiedler & Talley, 2006). Throughout the Mexican Pacific, many species of deep sea shrimps (Hendrickx & Serrano, 2010), mollusks (Zamorano, Hendrickx, & Toledano, 2006), Polychaetes (Mendez, 2007) and fishes (Levin, 2003) are distributed at established depth ranges, living above or below the OMZ, while some of them are able to live within the OMZ or perform vertical migrations through it.…”

“…The Gulf of California (GC) is a semi-closed sea, with strong processes of horizontal transport and vertical mixing of water in its Northern part (Palacios-Hernández, Beier, Lavín, & Ripa, 2002), while in its central and southernmost portions, the OMZ is located between 250 and 1 400 m depth, and between 70 and 1 300 m depth, respectively, with a hypoxic-anoxic zone (150-700 m depth), being an impenetrable barrier for some species (Zamorano et al, 2006;Mendez, 2007;Hendrickx & Serrano, 2010). The Southwest Coast of Mexico (SCM) belongs to the ECP and is influenced in its northernmost portion by the California Current, while in its central and southernmost portions it is influenced by tropical water masses from the North Equatorial and Costa Rica Currents (Kessler, 2006).…”