Organochlorine pesticides in immature scalloped hammerheads Sphyrna lewini from the western coast of the Gulf of California, Mexico: Bioaccumulation patterns and human exposure

Author(s):  
Ángela Ángel-Moreno Briones ◽  
Félix Augusto Hernández-Guzmán ◽  
Rogelio González-Armas ◽  
Felipe Galván-Magaña ◽  
Ana Judith Marmolejo-Rodríguez ◽  
...  
Atmosphere ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 275 ◽  
Author(s):  
Christian A. Álvarez ◽  
José N. Carbajal ◽  
Luis F. Pineda-Martínez ◽  
José Tuxpan ◽  
David E. Flores

Numerical simulations revealed a profound interaction between the severe dust storm of 2007 caused by Santa Ana winds and the Gulf of California. The weather research and forecasting model coupled with a chemistry module (WRF-CHEM) and the hybrid single-particle Lagrangian integrated trajectory model (HYSPLIT) allowed for the estimation of the meteorological and dynamic aspects of the event and the dust deposition on the surface waters of the Gulf of California caused by the erosion and entrainment of dust particles from the surrounding desert regions. The dust emission rates from three chosen areas (Altar desert, Sonora coast, and a region between these two zones) and their contribution to dust deposition over the Gulf of California were analyzed. The Altar Desert had the highest dust emission rates and the highest contribution to dust deposition over the Gulf of California, i.e., it has the most critical influence with 96,879 tons of emission and 43,539 tons of dust deposition in the gulf. An increase of chlorophyll-a concentrations is observed coinciding with areas of high dust deposition in the northern and western coast of the gulf. This kind of event could have a significant positive influence over the mineralization and productivity processes in the Gulf of California, despite the soil loss in the eroded regions.


2016 ◽  
Vol 31 (1) ◽  
pp. 55
Author(s):  
Hector Reyes -Bonilla ◽  
Arturo Ayala -Bocos ◽  
Francisco Javier Fernández -Rivera Melo ◽  
Ronald Zepeta -Vilchis ◽  
Andrea Asúnsolo-Rivera ◽  
...  

Cronología de tiburones del Parque Nacional Cabo Pulmo, Golfo de California; registros bibliográficos y de campo El arrecife de Cabo Pulmo en el suroeste del Golfo de California, México (23° 26´ N, 109° 25´ W), es considerado una de las áreas protegidas más exitosas del Pacífico americano, ya que durante este siglo han habido aumentos en abundancia y biomasa de peces carnívoros residentes (pargos, cabrillas, jureles, tiburones, etc.). Ello se debe al régimen de no pesca y el buen estado de conservación que le permiten mantener niveles altos de productividad primaria y secundaria. El aumento en el flujo de materia y energía ha provocado la llegada de especies de niveles tróficos altos como los tiburones, los cuales son más frecuentes y representan una atracción turística local. El objetivo del presente trabajo es presentar una cronología de la aparición de las distintas especies de tiburones en Cabo Pulmo, con base en bibliografia, trabajo de campo y consultas con residentes locales, guías de buceo y especialistas que han visitado la zona en los últimos 15 años. Los resultados muestran que en el arrecife de Cabo Pulmo se han registrado 11 especies de tiburones de 9 géneros y 6 familias; ocho de estas fueron anotadas en diversas fuentes bibliográficas; aquí se cita por primera vez la ocurrencia de tres más (Sphyrna lewini, Gynglymostoma cirratum y Carcharhinus longimanus). La llegada de estas especies a la zona arrecifal pudiera ser indicativo de un buen estado del ecosistema local, por ello es de esperarse que los próximos años se registre un número mayor de especies de tiburones, o de su biomasa.


2020 ◽  
Vol 38 ◽  
pp. 101381
Author(s):  
Juana López-Martínez ◽  
Carlos H. Rábago-Quiroz ◽  
Eloísa Herrera-Valdivia ◽  
Rufino Morales-Azpeitia ◽  
Jesús G. Padilla-Serrato

2013 ◽  
Vol 113B (3) ◽  
pp. 281-291
Author(s):  
Nancy Jazmín Reyes-Montiel ◽  
Apolinar Santamaría-Miranda ◽  
G. Durga Rodríguez-Meza ◽  
José Guillermo Galindo-Reyes ◽  
Héctor Abelardo González-Ocampo

2014 ◽  
Vol 2 (1) ◽  
pp. 17 ◽  
Author(s):  
E Hoyos-Padilla ◽  
James T Ketchum ◽  
A Klimley ◽  
Felipe Galván-Magaña

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Thelma A Aguilar-Rendón ◽  
José Juan Rendón-Herrera ◽  
Virginia Osuna-González ◽  
Erick Cristóbal Oñate González ◽  
Omar Domínguez-Domínguez ◽  
...  

The demand for shark fins in Asiatic markets has resulted in excessive increases in shark catches, even for species that may be under protection or subject to management. As such, it has been necessary to develop and promote monitoring efforts for exploited species and taxonomic groups in order to improve fishing management strategies for elasmobranchs. Identifying species from landings is one of many fishing management problems because landed organisms have usually already been processed and are therefore incomplete, which makes identification problematic, impedes the generation of proper species records, and leads to poor fishery assessments. Tools that can correctly identify species, such as various molecular techniques, have become essential for accurate fishery assessments. In this study, 30 hammerhead trunks from artisanal fisheries from the southern portion of the Gulf of California were identified using multiplex PCR (17 Sphyrna lewini and 13 Sphyrna zygaena). The total fee to identify each trunk with this technique was ~ $3.80 and the procedure required 2 to 5 days. When compared with other widely-used methods, such as PCR-RFLP or barcoding, multiplex PCR is fast, efficient, low-cost, and easy to implement in a laboratory.


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