GEOLOGIC EVOLUTION OF THE GULF OF CALIFORNIA NEAR MULEGÉ, BAJA CALIFORNIA SUR: RESULTS FROM BAJA BASINS NSF-REU (RESEARCH EXPERIENCE FOR UNDERGRADUATES)

2017 ◽  
Author(s):  
John B. Allard ◽  
◽  
Sonny Hutchinson ◽  
Naomi Acuña
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Baja California Sur ◽  
Research Experience

Backscattering and geophysical features of volcanic ridges offshore Santa Rosalia, Baja California Sur, Gulf of California, Mexico

1999 ◽  
Vol 93 (1-2) ◽  
pp. 75-92 ◽  
Author(s):  
Hubert Fabriol ◽  
Luis A Delgado-Argote ◽  
Juan José Dañobeitia ◽  
Diego Córdoba ◽  
Antonio González ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Baja California Sur ◽  
Santa Rosalia ◽  
Geophysical Features

A new genus and species of high intertidal barnacle (Cirripedia, Tetraclitidae) from Baja California Sur, México

Zootaxa ◽  
2006 ◽  
Vol 1118 (1) ◽  
pp. 57 ◽  
Author(s):  
LIZA GOMEZ-DAGLIO ◽  
ROBERT VAN SYOC
Keyword(s):  
Phylogenetic Analysis ◽  
Gulf Of California ◽  
New Genus ◽  
Baja California ◽  
Shell Growth ◽  
Baja California Sur ◽  
New Genus And Species ◽  
Entire Family ◽  
Single Row

A new genus and species, Lissaclita melaniae (Tetraclitidae), is described from the Gulf of California, Baja California Sur, Mexico. Lissaclita has a secondarily divided single row of parietal tubes without septa, lack of tubes in the radii, diametric shell growth, and a membranous basis. This combination of characters does not agree with any currently described subfamily within the Tetraclitidae. Lacking a detailed phylogenetic analysis of the entire family, we place the new genus in the Tetraclitidae without assigning it to a subfamily.

scholarly journals First Report of a Bionectria sp. Associated with a Stem Rot of Cardon Cactus (Pachycereus pringlei) in Baja California Sur, Mexico

Plant Disease ◽  
2012 ◽  
Vol 96 (2) ◽  
pp. 292-292 ◽  
Author(s):  
R. J. Holguín-Peña ◽  
L. G. Hernández-Montiel ◽  
H. Latisnere ◽  
E. O. Rueda-Puente
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Morphological Characteristics ◽  
Potato Dextrose Agar ◽  
Control Measures ◽  
World Heritage Site ◽  
Stem Rot ◽  
Baja California Sur ◽  
First Report ◽  
Pachycereus Pringlei

Giant cardon (Pachycereus pringlei ((S.Watson) Britton & Rose) is the most common cactus in northwestern Mexico and is endemic to the Baja California Peninsula and Sonora Desert. A large part of the peninsula (El Vizcaino Biosphere Reserve and Gulf of California) now consists of protected areas and is classified as a World Heritage site by UNESCO ( http://whc.unesco.org/en/list/1182 ). Cardon cactus is an important ecological resource for indigenous people and is used as feed for range cattle. Since 2000, in the central and southern part of the State of Baja California Sur, an apical stem rot has spread to ~17% of the natural cardon population around San Pedro (23°29′N, 110°12′W), La Paz (24°08′N, 110°18′W), and El Comitán (24°05′N, 110°21′W). Affected cacti display necrosis of apical branches, dry rot, cracks in the stem and branches, bronzing of mature spines surrounding the affected area, and reddish brown gummy exudate. Thirty samples from the edges of symptomatic lesions were surface disinfected for 2 min in 0.8% (wt/vol) NaOCl and ethanol (70%), rinsed in sterile, distilled water, and grown on potato dextrose agar at 27°C. A cottony, brownish fungus was consistently isolated from affected tissues. Koch's postulates were performed in pots of 10 cm in diameter with 5-year-old cacti inoculated (9-day-old mycelia) and incubated (15 days) at room temperature (26°C). The rough, dry, brownish, circular lesions that appeared were the same as those observed in the field. Healthy cacti inoculated with potato dextrose agar plugs were symptomless. The fungus was always reisolated from infected cacti and morphological examinations (2) were performed: one-septate, olive-green, smooth, ellipsoidal conidium and two-celled ascospores (15 to 20 × 5 to 7 μm) were present. Also present were conidial masses from monomorphic, penicillate conidiophores in sporodochia. Cottony and white-to-light yellow PDA colonies were observed. Genomic DNA was extracted from lyophilized hyphae using the method described by O'Donnell (1) or with a DNeasy Plant Mini Kit (Qiagen, Hilden, Germany). The internal transcribed spacer (ITS) regions 1 and 2 of the 5.8, 18, and 28S ribosomal RNA genes were amplified with the primer pairs ITS1 and ITS4 (3). The expected amplicon of 571 bp was sequenced and compared with fungal sequences available from the GenBank-EMBL database using the BlastN and CLUSTAL programs (MegAlign, DNASTAR, Madison, WI). The closest nucleotide similarity had 99% identity with a Bionectria sp. (GenBank Accession No. HM849058.1). To our knowledge, on the basis of morphological characteristics, DNA comparisons, and pathogenicity tests, this is the first report of a Bionectria sp. causing an apical stem rot disease in cardon cacti in Mexico. Since there are no control measures in Mexico there is a permanent risk that the disease will spread to healthy areas. References: (1) K. O'Donell et al. Mycologia 92:919, 2000. (2) H. J. Schroers. Stud. Mycol. 46:1, 2001. (3) T. J. White et al. PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, 1990.

Strain partitioning in highly oblique rift settings: Inferences from the southwestern margin of the Gulf of California (Baja California Sur, México)

Tectonics ◽  
2019 ◽  
Vol 38 (12) ◽  
pp. 4426-4453
Author(s):  
Marco Bonini ◽  
Mariano Cerca ◽  
Giovanna Moratti ◽  
Margarita López‐Martínez ◽  
Giacomo Corti ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Baja California Sur ◽  
Strain Partitioning ◽  
Southwestern Margin

Genetic investigation of three type specimens of Osmundea (Rhodomelaceae, Rhodophyta) from the Gulf of California, Mexico and California, USA

Phytotaxa ◽  
2021 ◽  
Vol 489 (1) ◽  
pp. 65-78
Author(s):  
JEFFERY R. HUGHEY ◽  
KATHY ANN MILLER
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Taxonomic Status ◽  
Baja California Sur ◽  
Genetic Investigation ◽  
Type Specimens ◽  
Organellar Genomes ◽  
Red Algal ◽  
Algal Genus ◽  
High Level

The taxonomic status of species assigned to the marine red algal genus Osmundea from Pacific North America has not been critically studied. We analyzed the complete organellar genomes of an isotype specimen of O. sinicola and conducted a genetic comparison of rbcL and COI-5P markers based on 15 specimens of Laurencia scrippsensis, O. crispa, and O. sinicola collected from California, the Gulf of California, and Pacific Baja California, including their type specimens. The mitogenome of O. sinicola was 25,021 bp in length and contained 44 genes, and the plastid genome was 171,419 bp with 225 genes. Both genomes show a high level of gene synteny with previously published organellar chromosomes from the Rhodomelaceae. Phylogenetic analysis of the rbcL and COI-5P genes identified two distinct clades, one containing the isotype of O. sinicola, and the other included the isotype of O. crispa and holotype of Laurencia scrippsensis. These data show that L. scrippsensis is a heterotypic synonym of O. crispa, rather than of O. sinicola. They support the recognition of two species, O. crispa from Monterey, California to Baja California Sur, and O. sinicola from Baja California Sur to the Gulf of California. California specimens identified as O. sinicola are misidentified O. crispa. Reports of O. sinicola from outside this range based on morpho-anatomy require confirmation by DNA sequencing. These genetic results highlight the need further analyses of type material from the Rhodomelaceae.

A new species of Dasybranchethus (Annelida: Capitellidae) from Mexican Pacific, with a redescription of Dasybranchethus fauveli

2009 ◽  
Vol 89 (7) ◽  
pp. 1437-1441 ◽  
Author(s):  
M.E. García-Garza ◽  
J.A. de León-González
Keyword(s):  
New Species ◽  
Gulf Of California ◽  
Type Species ◽  
Baja California ◽  
Type Material ◽  
Baja California Sur ◽  
Middle Line ◽  
Dorsal Lobe ◽  
Mexican Pacific ◽  
A New Species

Dasybranchetus pacifica, collected in Concepcion Bay, Baja California Sur, Gulf of California, is described as a new species. In addition, the type species of the genus, Dasybranchetus fauveli Monro, 1931, is redescribed based on type material. The new species differs from D. fauveli in the absence of branchiae, the begining of the mid-dorsal lobe from chaetiger 2 instead of chaetiger 9, abdominal segments with well-developed neuropodial lobes, and hooded hooks with a main fang and three rows of subapical teeth in the following arrangement: 4 teeth in the basal line, 3 in the middle line, and 2 in the apical line.

scholarly journals Sequestration of Carbonate Shell Material in Coastal Dunes on the Gulf of California (Baja California Sur, Mexico)

2006 ◽  
Vol 223 ◽  
pp. 611-624 ◽  
Author(s):  
Paul A. Skudder ◽  
David H. Backus ◽  
David H. Goodwin ◽  
Markes E. Johnson
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Coastal Dunes ◽  
Baja California Sur ◽  
Shell Material ◽  
Carbonate Shell

scholarly journals Coastal Geomorphology of a Post-Holocene Hurricane Deposit on a Pleistocene Marine Terrace from Isla Carmen (Baja California Sur, Mexico)

2018 ◽  
Author(s):  
Markes E. Johnson ◽  
Jorge Ledesma-Váqquez ◽  
Rigoberto Guardado-France
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Coastal Geomorphology ◽  
Baja California Sur ◽  
Marine Terrace ◽  
Eastern Shore ◽  
Rock Types ◽  
Igneous Origin ◽  
Average Wave ◽  
Rocky Coast

This study reports the first example of major erosion from hurricanes degrading a rocky coastline anywhere around the Gulf of California, although other sources of evidence are well known regarding the effect of inland erosion due to catastrophic rainfall in the Southern Cape Region of the Baja California peninsula and farther north. The uplifted, 12-meter terrace on the eastern shore of Isla del Carmen is the site of an unconsolidated coastal boulder deposit (CBD) consisting of large limestone blocks and boulders eroded from underlying Pliocene strata. The CBD stretches approximately 1.5 km in length, mostly set back 25 m from the lip of the terrace. The largest blocks of upturned limestone near the terrace edge are estimated to weigh between 5.8 and 28 metric tons. Waves impacting the rocky coast that peeled back slabs of horizontally layered limestone at this spot are calculated to have been between 11.5 and 14 m in height. Analysis of sampled boulders from the CBD set back from the terrace edge by 25 m suggest that the average wave height responsible for moving those boulders was on the order of 4.3 m. Additional localities with exposed limestone shores, as well as other more common rock types of igneous origin, have yet to be surveyed for this phenomenon elsewhere around the Gulf of California.

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