Serologically Differentiated Subpopulations of the Pacific Sardine, Sardinops caerulea

1964 ◽  
Vol 21 (4) ◽  
pp. 691-701 ◽  
Author(s):  
Andrew M. Vrooman
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Frequency Of Occurrence ◽  
The Third ◽  
The Pacific ◽  
Pacific Sardine ◽  
Positive Factor ◽  
Outer Coast

Three genetically distinct subpopulations of the Pacific sardine have been differentiated by the frequency of occurrence of a C-positive blood factor. Two of these subpopulations, a northern and a southern one, live off the coast of California and the outer coast of Baja California, Mexico. The third group inhabits the Gulf of California. The C-positive factor occurred in 13.6% of the northern subpopulation, 6.0% of the southern, and 16.8% of the Gulf subpopulation.

Checklist of conspicuous reef fishes of the Bahía de los Ángeles region, Baja California Norte, Mexico, with comments on abundance and ecological biogeography

Zootaxa ◽  
2011 ◽  
Vol 2922 (1) ◽  
Author(s):  
ISMAEL MASCAREÑAS-OSORIO ◽  
BRAD ERISMAN ◽  
JERRY MOXLEY ◽  
EDUARDO BALART ◽  
OCTAVIO ABURTO-OROPEZA
Keyword(s):  
Los Angeles ◽  
Species Composition ◽  
Relative Abundance ◽  
Gulf Of California ◽  
Baja California ◽  
Reef Fishes ◽  
Eastern Pacific ◽  
Frequency Of Occurrence ◽  
Tropical Eastern Pacific ◽  
Geographic Distributions

A first checklist of conspicuous reef fishes observed at 15 sites in the vicinity of Bahía de los Ángeles from 2008 to 2010 is presented. A total of 70 species representing 31 families were observed. Species composition was similar to well studied regions in the southern Gulf of California, in that most species had distributions that span the Tropical Eastern Pacific but species endemic to Mexico or the Gulf of California ranked highest in relative abundance, frequency of occurrence, and mean density. Several species with temperate geographic distributions were more abundant and frequent than on reefs in the southern Gulf. Large-bodied, predatory species such as sharks and the Gulf Grouper, Mycteroperca jordani, were rare or absent.

Distribution and abundance of the Pacific sardine (Sardinops sagax) in the Gulf of California and their relation with the environment

2001 ◽  
Vol 49 (1-4) ◽  
pp. 565-580 ◽  
Author(s):  
Manuel O Nevárez-Martı́nez ◽  
Daniel Lluch-Belda ◽  
Miguel A Cisneros-Mata ◽  
J Pablo Santos-Molina ◽  
Ma De los Angeles Martı́nez-Zavala ◽  
...  
Keyword(s):  
Gulf Of California ◽  
The Pacific ◽  
Pacific Sardine ◽  
Sardinops Sagax

scholarly journals Isotope geochemistry and petrogenesis of peralkaline Middle Miocene ignimbrites from central Sonora: relationship with continental break-up and the birth of the Gulf of California

2008 ◽  
Vol 179 (5) ◽  
pp. 453-464 ◽  
Author(s):  
Jesús R. Vidal Solano ◽  
Henriette Lapierre ◽  
Joann M. Stock ◽  
Alain Demant ◽  
Francisco A. Paz Moreno ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Middle Miocene ◽  
Baja California ◽  
Isotope Geochemistry ◽  
Early Stage ◽  
Major Change ◽  
Crustal Material ◽  
Isotopic Signatures ◽  
The Pacific ◽  
Specific Stage

Abstract Middle Miocene peralkaline ignimbrites constitute a specific geodynamic marker of the early stage of opening of the Gulf of California, preserved either in central Sonora or the Puertecitos area, in Baja California. Very uniform ages (12-12.5 Ma) obtained on these rocks show that this volcanic episode corresponds to a specific stage in the tectonic evolution of the proto-gulf area. Field observations and slightly different Sr and Nd isotopic signatures support eruptions from several small volume magma batches rather than from a large-volume caldera forming event. Isotopic ratios help to constrain the petrogenesis of the peralkaline liquids by fractional crystallization of transitional basalts in a shallow reservoir, with slight contamination by Precambrian upper crustal material. Less differentiated glomeroporphyritic icelandites erupted at about 11 Ma, mark an increase in the magma production rate and highlight an easier access to the surface, illustrating an advanced stage in the weakening of the continental crust. The tilting of the Middle Tertiary sequences results from a major change in the tectonic regime, from E-W extension giving rise to N-S grabens, to NNW-SSE strike-slip motion that can be related to the transfer of Baja California from North America to the Pacific plate. The location of peralkaline volcanism coincides with the southern edge of the Precambrian crust and the southernmost extension of the California slab window at 12.5 Ma.

scholarly journals First record of Glycera guatemalensis and G. sphyrabrancha (Annelida: Glyceridae) from Western Mexico

2019 ◽  
Vol 67 (S5) ◽  
pp. S63-S69
Author(s):  
María Elena García-Garza ◽  
Iliana Torres-Manríquez ◽  
María Ana Tovar-Hernández ◽  
Jesús Angel De León-González
Keyword(s):  
Intertidal Zone ◽  
Gulf Of California ◽  
Baja California ◽  
First Record ◽  
Morphological Characters ◽  
Mexican Pacific ◽  
Western Mexico ◽  
Shrimp Trawl ◽  
The Pacific ◽  
Objective Evidence

Introduction: Glycerides, commonly called “blood worms”, are relatively thin polychaetes that reach considerable sizes. They have been reported for all the seas of the world from the intertidal zone to abyssal depths. Objective: Evidence the presence of two species of Glycera for the littorals of the Mexican Pacific. Methods: An analysis of the glycerides of the Pacific coast of Mexico was carried out, finding two species that were collected, one of shrimp trawl at a depth of 18 meters off Puertecitos, Baja California, as well as by manual sampling in the intertidal zone of Concepción Bay, Baja California Sur in the Gulf of California. For their taxonomic determination, morphological characters of greater relevance for their identification were examined, such as jaws, aileron shape, parapodia, chaetae, and the type of pharyngeal papillae. Results: We diagnosed and schematized Glycera guatemalensis Böggemann & Fiege, 2001 and Glycera sphyrabrancha Schmarda, 1861. Conclusions: Glycera guatemalensis described for Guatemala and Glycera sphyrabrancha described for Jamaica, are recorded for the first time for the Gulf of California.

scholarly journals EDAD Y CRECIMIENTO DE LA SARDINA MONTERREY SARDINOPS CAERULEUS (PISCES: CLUPEIDAE) EN ISLA DE CEDROS, BAJA CALIFORNIA, MEXICO, DURANTE 1985 Y 1986.

2016 ◽  
Vol 25 ◽  
Author(s):  
Reyna Alvarado Castillo ◽  
Roberto Félix Uraga
Keyword(s):  
Growth Model ◽  
Standard Length ◽  
Baja California ◽  
First Year ◽  
Dominant Group ◽  
The Pacific ◽  
Pacific Sardine ◽  
Modal Size

Monthly samples of pacific sardine Sardinops caeruleus (Pisces: Clupeidae) were taken during 1985 and 1986 from the commercial fleet that operates in isla de Cedros, Baja California, México; 2609 organisms were measured and 994 pairs of otoliths were collected in order to estimate the age through reading of opaque and hyaline bands. Eighty-seven percent of the otoliths were readable, finding organisms up to five years old. In the 1985 commercial capture two year old sardines were the most abundant, but in 1986 the three year old sardines were the dominant group. The size ranged between 135 mm and 230 mm standard length; the modal size was 170 mm in 1985 and 190 mm in 1986. The growth of the pacific sardine is very fast, reaching 140 mm of standard length during the first year. The estimate of the parameters of Bertalanffy growth model for this period was: 1-ÿ=198.52 mm, k=1.14 and to=0.012.

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