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Galvan-Magana F.,Centro Interdisciplinario Of Ciencias Marinas | Acevedo-Cervantes A.,Technological Institute of Guaymas
Latin American Journal of Aquatic Research | Year: 2016

We presented the species composition and biogeography at the Las Guásimas Lagoon, located in the central portion of the Gulf of California. We perform seven sampling and the seasonal collections were made with three gear: cast nets, seine and trawl line. We recorded 95 species represented by 16 orders, 38 families and 67 genera. The families in number of species were: Carangidae, Sciaenidae, Haemulidae, Paralichthydae, Engraulidae and Gerreidae. Besides were identified three endemic species of the Gulf of California (Micropogonias megalops, Leuresthes sardina and Pleuronichthys ocellatus). Biogeographic affinity analyzes showed results that indicate a high dominance of species distributed in the Eastern Tropical Pacific (Province of Cortes and Panamic) and transitional species between the California Province and the Eastern Tropical Pacific (ETP). We use previous research on fish in the locality and make a comparison between the previously recorded species and new species observed, using as indicators of vulnerability and resilience. Changes in community structure over time, which might be induced by environmental changes, human activities such as fishing and/or ecosystem dynamics were observed. Most of the species that are new records in the coastal lagoon (84%) they showed moderate to high vulnerabilities, emphasizing the fact of the high importance of the lagoon as a nursery and protection of these species. © 2016, Escuela de Ciencias del Mar. All rights reserved. Source

The Gulf of California has a high variety of ecosystems that allow different services and the fishery resources play a prominent role in its ecology, evolution and economics. Fish coastal species have been previously reported for most coastal areas, especially those species that are subject to fishing, how-ever, litde is known on the species from deep sea zones, due to sampling difficulties. We studied the deep sea fishes collected with trawl nets during three research surveys in the Gulf of California, Mexico in 2004-2005. We provide a systematic checklist and some notes on biogeographical aspects. For this, 74 fishing hauls were done, and a total of 9 898 fishes were captured, belonging to two classes, 15 orders, 35 families, 53 genera and 70 species. The best represented families in number of species were: Paralichthyidae (eight), Serranidae (six), and Scorpaenidae and Triglidae with five species each one. The typical families from deep waters were: Ophidiidae, Moridae, Lophiidae, Scorpaenidae, Triglidae, Paralichthydae, Pleuronectidae and Cynoglossidae. Size range varied from 13cm for the Splinose searobin (Bellator xenisma) to 234cm in the Pacific Cutlassfish (Trichiurus nitens). The biogeographical affinity showed that species with affinity to the East Tropical Pacific (ETP) dominated, followed by species from San Diego-Panamic, San Diego-Panamic-Peruvian-Chilean and Oregonian-Cortes provinces, respectively. A biogeographic overlap was found in the fauna, which reflects the Gulf of California's geographical position, with distribution limits of species from temperate, tropical and warm-temperature transition affinities, divisions that characterize the Gulf of California. Taxonomic status of fish with a focus on composition, location, characterization and zoogeography are fundamental to any subject of biodiversity and fisheries management actions. Rev. Biol. Trop. 60 (1): 347-360. Epub 2012 March 01. Source

Miranda-Baeza A.,University of Sonora | Orozco-Medina C.,Technological Institute of Guaymas | Rivas-Vega M.E.,University of Sonora | Luna-Gonzalez A.,National Polytechnic Institute of Mexico
Hidrobiologica | Year: 2015

The load of heterotrophic bacteria and Vibrio spp. were evaluated in an integrated culture system of Litopenaeus vannamei Boone 1931, Mytella guyanensis Lamarck 1819 y Gracilaria vermiculophylla (Ohmi) Papenfuss, lasting for 45 days. The concentrations of heterotrophic bacteria were statistically similar at the beginning and at the end of the integrated culture and non-integrated culture (control), within a range from 106 to 107 CFU/mL; however, at the end, the total counts of vibrios in non-integrated culture were significantly higher than in an integrated culture, up to 8.8×104 UFC/mL. The integrated culture systems showed the capability to maintain load low levels of heterotrophic bacteria without detriment of the shrimp survival, reducing additionally the load of Vibrio spp. Source

Acevedo-Cervantes A.,Technological Institute of Guaymas
Hidrobiologica | Year: 2013

The cannonball jellyfish (S. meleagris) has reached production levels that has led it to become an important fishery resource in Las Guásimas, Sonora, a coastal lagoon in northwestern Mexico; however, its ecological importance and role in the ecosystem remain unstudied. This contribution describes the diet composition of this species in order to reveal its trophic importance in this coastal lagoon. Up to 17 jellyfish were captured in each of three surveys (March 2008, February and April 2009), their stomachs were extracted and analyzed to determine their diet composition. The quantitative methods: frequency of occurrence (F), numeric (N), gravimetric (W) and the index of relative importance, were used to measure the diet components, and Levińs index to measure the diet amplitude. Thirteen preys were identified; all belonging to the zooplankton community; the most important prey were the anchovy eggs. Our results show that S. meleagris is a specialist predator (with a marked preference for certain prey), classified in the third trophic level (3.2), as a secondary consumer. Source

Vazquez H.J.,CICESE | Gomez-Valdes J.,CICESE | Ortiz M.,CICESE | Dworak J.A.,Technological Institute of Guaymas
Journal of Atmospheric and Oceanic Technology | Year: 2011

Spatiotemporal fitting by the least squaresmethod is commonly applied to distinguish themean flow fromthe tidal current from shipboard ADCP data in coastal ocean. To analyze this technique in a pelagic region of an eastern boundary current system, a 6-yr period of shipboard ADCP data off Baja California is examined. A diverse set of basis functions is studied and a global tidal model is used for comparison purposes. The Gaussian function together with a nodal configuration of one node in themiddle and close to the coast of the region is the best option. However, to obtain the optimal solution, the geostrophic flow, which is stronger than the tidal flow and highly variable off Baja California, might be removed prior to fitting the data. In general, the semimajor axis of the tidal ellipse (M2) is parallel to the coast and the phase speed is poleward and parallel to the coast, in agreement with Kelvin wave dynamics. Because the tides in eastern boundary currents are explained by Kelvin wave dynamics, the use of both the velocity fieldwithout geostrophic variability and theGaussian function in the spatiotemporal fitting by least squares technique is a promising tool for detiding shipboard ADCP data from these systems. © 2011 American Meteorological Society. Source

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