Technological Institute of Guaymas

www.itg.edu.mx
Guaymas, Mexico
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Garcia-Hernandez J.,Research Center En Alimentacion sarrollo Ac | Rosales-Grano P.,Technological Institute of Guaymas
Journal of Environmental Planning and Management | Year: 2017

Recreational beaches are strategic ecosystems for tourism and should be used in a sustainable manner. We studied three beaches in the municipality of Guaymas (NW Mexico), in order to assess their beach quality and identify key management issues. The evaluation was based on the perceptions of users concerning: (1) the user profile; (2) the recreational habits of users; and (3) the biophysical characteristics, infrastructure, services, and cleanliness of each beach. The results showed that the beaches were of different quality. The key management issues identified were the need to design and apply specific management programs for each beach, specifically in regards to improving infrastructure and services, and obtaining certification as a sustainable beach. The evaluation of the beaches as perceived by users suggests that it would be useful to assess beach quality in order to support management goals and be applicable to other beaches, both nationally and internationally. © 2017 Newcastle University


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.


Ruelas-Pena J.H.,Technological Institute of Guaymas | Valdez-Munoz C.,Technological Institute of Guaymas
Latin American Journal of Aquatic Research | Year: 2013

The gulf corvina (Cynoscion othonopterus), is an endemic species of the Gulf of California, and its fishery is one of the most important in the Upper Gulf of California. Two dynamic biomass models (Schaefer & Pella-Tomlinson), were used to assess the state of the stock due to the lack of enough age data for a reliable full age-structured stock assessment. The models required an historical annual time-series of the abundance index (from 1993 to 2010), derived from the commercial catch and effort data. The Akaike information criterion indicates that the best model was the Schaefer model. The maximum sustainable yield (MSY), estimated with the Schaefer model was 3.100 ton, with a maximum surplus biomass (BMSY) that will allow the capture of 8.200 ton, and a fishing effort (fMSY) of 457 boats. The fishing mortality (F = 0.43) was 26% higher than the fishing mortality at the biological reference point (F0.1 = 0.34). The average biomass from 2006 to 2010 was 52% of the optimum level of the fishery (Est2006-2010 < 1). In 1999 an increase of the fishing effort accelerated the decrease of the biomass. These results indicate that the stock has not been healthy, in spite of the Biosphere Reserve decree, because the core zone has not been respected as a prohibited zone for fishing, and because of the increased fishing effort.


Rabago-Quiroz C.H.,University of Sonora | Valdez-Holguin J.E.,University of Sonora | Nevarez-Martinez M.O.,Centro Regional Of Investigacion Pesquera | Acevedo-Cervantes A.,Technological Institute of Guaymas
Marine Biology Research | Year: 2012

The assemblage of the fish species obtained as bycatch in trawl nets on the Gulf of California in 2004, 2005 and 2007 was studied. Sampling was carried out during July and August at a series of stations along the coast of Sonora. The criteria for the most important fish species caught were drawn from abundance and frequency of occurrence and weight, using various ecological indices (index of relative abundance, biological value index and index of relative importance). After identification, these species and their abundances were used to define study groups based on similarity matrices and Ward's clustering method. We analysed 125 fish hauls containing&19,000 organisms, representing 243 species (fish, crustaceans, molluscs and echinoderms). There were 28 dominant species, most notably Urobatis halleri, Synodus scituliceps, Eucinostomus argenteus, Diplectrum pacificum and Haemulopsis nitidus. Cluster analysis, based on latitude, and bathymetry showed three station groupings. The first was characterized by species from the northern region of the Gulf with a bathymetric distribution&25 m. The second was dominated by species from the central to southern region from depths<25 m. The third was a transitional group with species found between the central and southern Gulf from depths of 10 to 45 m. Most fish assemblages consist of species with wide distribution within distinct biogeographic provinces, which showed a major change in the association, frequency and absence of species from north to south, indicating a variety of habitats in the Gulf of California. © 2012 Copyright Taylor and Francis Group, LLC.


Carbajal N.,San Luis Potosí Institute of Scientific Research and Technology | Dworak J.A.,Technological Institute of Guaymas | Montano-Ley Y.,National Autonomous University of Mexico | Noyola-Medrano C.,San Luis Potosí Institute of Scientific Research and Technology
Environmental Earth Sciences | Year: 2014

A two-dimensional, vertically integrated, nonlinear numerical model was applied to investigate the tide-driven bed load transport of sediments and morphodynamics in the shallow coastal lagoon of Yavaros, located in the southeastern part of the Gulf of California, Mexico. Satellite imagery exposes strong sediment dynamics in this coastal region. The dynamics in the lagoon were forced by 13 tidal constituents at the open boundary. Tides are of a mixed character and they are predominantly semidiurnal. The calculations showed areas of intense tidal currents and considerable water exchange with the Gulf of California. Numerical experiments revealed an ebb-dominant tidal distortion and a net export of sediment from the lagoon to the Gulf of California. A simulation of 20 years showed that the lagoon exported about 1,600 m3 of sediment; however, the daily oscillating exchange of sediment reached values of around 8 m3. The daily averaged flux of export-import sediments oscillates principally with semiannual, monthly and fortnightly periods. By applying a threshold velocity, a variable friction coefficient and the calculated amplitude of tidal velocities, it was possible to determine that morphological changes occur in zones of sharp topographic gradients and to explain the effect of friction on the export-import process of sediments. A 10-year simulation revealed that accumulation of sediment (~20 cm) occurred in small areas, whereas erosion occurred in larger areas but with less intensity (~8 cm). Besides the importance for the morphodynamics, these kinds of erosion-accretion processes may be relevant for the marine ecology. © 2013 Springer-Verlag Berlin Heidelberg.


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.


PubMed | Technological Institute of Guaymas
Type: Journal Article | Journal: Fish physiology and biochemistry | Year: 2013

Metamorphosing leptocephalous larvae of the bonefish (Albula sp.) were analyzed for total ninhydrinpositive substances (NPS) and free amino acids. Total NPS content showed little change during metamorphosis. The average NPS value (S.E.) for 16 larvae was 1.8 (0.1) mglarva(-1), which represents approximately 4% and 8% of the total dry weight of early and advanced larvae, respectively. Taurine was the most abundant free amino acid in whole-larva extracts, accounting for 36% and 59% of the total by weight in early and advanced larvae, respectively. The essential amino acids, leucine, isoleucine, phenylalanine, histidine, valine, methionine, lysine and arginine, accounted for about half (47%) of the total in early larvae but were reduced to about 23% of the total in advanced larvae. All of the component essential amino acids decreased during metamorphosis, but the greatest effect was seen with the first five. The remaining non-essential amino acids comprised less than 20% of the total in early larvae and, although the overall value changed little during metamorphosis, certain components such as glycine and glutamic acid showed large increases whereas others such as tyrosine and serine were reduced. Increases in amino acid content after acid hydrolysis of whole-larva extracts indicated that trichloroacetic acid-soluble, low molecular weight peptides were present in both early and advanced leptocephali.


PubMed | Technological Institute of Guaymas
Type: Journal Article | Journal: Fish physiology and biochemistry | Year: 2013

Proteoglycans (PGs) were isolated from leptocephalous larvae of the bonefish (Albula sp.), which were in the early stages of metamorphosis, using both associative and dissociative conditions in the presence of protease inhibitors. The procedure was rapid and resulted in an extraction efficiency of 75% (associative) and 85-90% (dissociative). The majority of co-extracted protein could be effectively separated from the PGs by utilizing either Sepharose CL-2B or CL-6B gel chromatography. Sepharose CL-2B chromatography of extracted PGs after treatment with bacterial keratan sulfate-endo--galactosidase (keratanase) showed that most of the high molecular weight (M r) carbohydrate was degraded. Free keratan sulfate (KS) chains were prepared from whole-larva extracts (which also contain small amounts of chondroitin sulfate) by both chondroitinase ABC treatment and ethanol fractionation. Sepharose CL-6B chromatography under dissociative conditions showed that larval KS chains were much larger (M r55,000) than those from cornea. These chains tended to aggregate when chromatographed under associative conditions. Larval KS was degraded by keratanase and resistant to chondroitinase, ABC and testicular hyaluronidase. Differences were also noted in the oligosaccharides produced by keratanase treatment of the two preparations. However, biochemical composition of larval and corneal KS was similar.


PubMed | Technological Institute of Guaymas
Type: Journal Article | Journal: Fish physiology and biochemistry | Year: 2013

Energy budget calculations, based on published values for changes in biochemical composition and oxygen consumption, have confirmed that metamorphosing bonefish (Albula sp.) larvae from the Gulf of California receive all of their metabolic energy requirements from the breakdown of endogenous reserves. The calculations showed that during metamorphosis, about 80% of the energy was supplied by lipid, and most of the remainder was provided by keratan sulfate glycosaminoglycan. These results support the suggestion that keratan sulfate can function as a storage polysaccharide, a novel function for glycosaminoglycans in vertebrates.


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.

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