Centro Intercultural Of Estudios Of Desiertos Y Oceanos

Puerto Peñasco, Mexico

Centro Intercultural Of Estudios Of Desiertos Y Oceanos

Puerto Peñasco, Mexico
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Perez-Valencia S.A.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos
Indian Journal of Marine Sciences | Year: 2013

This study first describes the age and growth of the cortes geoduck Panopea globosa in the upper Gulf of California. Ages were from 2 to 34 years old but mode was 11 and 12 y. Average size was 146±3 mm shell length. According to the VBGM, the asymptotic length of the shell in cortes geoduck P. globosa off Puerto Peñasco (located in the upper Gulf of California) was 163.88 mm and the growth coefficient (k) was 0.17. It is recorded a P. globosa of 34 y old and the nearest was another individual 22 y. This shows that cortes geoduck from the upper Gulf of California is a recently settled populations. Being a recently detected species this information become important for biological knowledge and for managerial purpose as fishery.

Ainsworth C.H.,Marine Resources Assessment Group Americas Inc. | Morzaria-Luna H.,Marine Resources Assessment Group Americas Inc. | Kaplan I.C.,National Oceanic and Atmospheric Administration | Levin P.S.,CSIRO | And 5 more authors.
Marine Policy | Year: 2012

The Northern Gulf of California is an area important for small-scale fisheries in terms of economic activity and food security, but widespread non-compliance with fisheries regulations impedes effective management of resources and conservation efforts. Where a previous study evaluated quantitatively a theoretical situation in which all regulations are perfectly followed, this article compares a suite of recently proposed ecosystem-based management (EBM) policies against the expected benefits of full enforcement of current regulations. Policies evaluated include no-take marine protected areas (MPAs), breeding period closures, changes in hook size and fishing effort, and gear-specific spatial closures. No-take MPAs yield ecological benefits over a wide range of MPA sizes and characteristics, but do not increase overall catch. Seasonal closures are effective at reducing overfishing for the depleted leopard grouper (Mycteroperca rosacea); changing the hook size of artisanal longlines does not increase catch of either the target species or the assemblage, and gear-specific fishery closures for crab traps near Puerto Peñasco are effective at reducing overfishing of blue crab (Callinectes bellicosus and C. arcuatus). In general, full enforcement of existing regulations outperforms these EBM policies in terms of conservation benefits, but it may be less palatable to stakeholders as it requires major reductions in catch. © 2012 Elsevier Ltd.

Perez-Valencia S.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos | Vadopalas B.,University of Washington | Ramirez-Perez S.,Autonomous University of Sinaloa
Malacologia | Year: 2012

Most previous studies identifying Panopea generosa and P. globosa have used non-rigorous visual methods as well as older shell measurement techniques. Newer mathematical methods based on shell shape variation allow for more accurate identification of clam species, as well as modeling of phenotypic differences due to environmental effects in populations in different sites. Interspecific shell morphology for two Mexican geoduck clam species was analyzed from a total of five sites off both coasts of the Baja California peninsula. In addition, intraspecific analyses of shell morphology were conducted for one of the species, P. globosa, at four sites along its reported distribution. Two approaches were employed for the analyses: a novel approach based on radiating lines to characterize shell outlines, and a more traditional approach using internal shell landmarks. In general, the novel approach afforded greater fidelity in distinguishing inter-and intraspecific variation. Our results from both methods agree with original species descriptions, and showed that Bahía Magdalena geoducks are P. globosa, thus revealing a wider distribution than previous reports for this species. The outline and internal scars were highly discriminant between the two species. Shell shape of P. generosa was also less variable than that of P. globosa. Intraspecific analyses of P. globosa shell shape suggest an adaptive or phenotypic response to environmental conditions at each site. Our results may also be indicative of reproductive isolation between Pacific P. globosa at Bahía Magdalena and conspecifics in the Gulf of California.

Munguia-Vega A.,University of Arizona | Castillo-Lopez A.,University of Arizona | Pfister T.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos | Cudney-Bueno R.,University of California at Santa Cruz
Conservation Genetics Resources | Year: 2010

Twelve microsatellite markers (six di-nucleotides, four tri-nucleotides and two tetra-nucleotides) were isolated and characterized for Callinectes bellicosus, a commercial crustacean species from the Gulf of California, Mexico. One locus was monomorphic and 11 loci were polymorphic in 32 individual samples from a single location. Overall polymorphic loci, the number of alleles per locus ranged from 2 to 24 (average 10.0), the observed heterozygosity ranged from 0.094 to 0.969 (average 0.603), and the expected heterozygosity varied from 0.089 to 0.935 (average 0.597). One locus deviated significantly from Hardy- Weinberg equilibrium due to an excess of heterozygotes, while another locus showed evidence for the presence of a null allele. No evidence of linkage disequilibrium was found among pair of loci. These markers will be helpful to estimate the level of genetic connectivity over a small spatial and temporal scale in order to identify stocks for the management of this small-scale fishery in the Gulf of California. © The Author(s) 2010.

Moreno-Baez M.,University of Arizona | Moreno-Baez M.,University of California at San Diego | Cudney-Bueno R.,University of Arizona | Cudney-Bueno R.,University of California at Santa Cruz | And 4 more authors.
Ocean and Coastal Management | Year: 2012

Fishers' knowledge collected through a rapid appraisal process that involved semi-structured interviews in 17 fishing communities in the Northern Gulf of California, Mexico, was used to understand the spatial and temporal scales at which small-scale fisheries operate. This study identifies 43 main target species and group of species and the fishing gear preference(s) for the harvest of each. The reported spatial and temporal patterns associated with the target species were used to evaluate use of existing marine protected areas (MPAs), the distance traveled to reach fishing areas, and the timing and locations of fishing activities. MPAs were found to be important fishing areas for multiple communities with 79% of the total area within MPAs being actively utilized. Five communities stand out in their capacity to travel up to 200km to reach their fishing grounds. The results also show a clear a seasonal differentiation in species and areas targeted as well as fishing gear and methods used. A systematic incorporation of information related to spatial and temporal scales in fishing activities provides additional opportunities for the sustainable management of fisheries, both for the Mexican government and local interests. The incorporation of local knowledge helped building a source of information that can provide insights for regulatory agencies in the development of spatially explicit management measures in the Northern Gulf of California, Mexico. © 2011 Elsevier Ltd.

Calderon-Aguilera L.E.,Research Center Cientifica Educacion Superior Of Ensenada | Perez-Valencia S.A.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos
Journal of Shellfish Research | Year: 2015

In the upper Gulf of California, a lucrative fishery of the Cortes geoduck Panopea globosa (Dall 1898) is developing rapidly. Both exploited and unexploited areas for this fishery still exist in this area. The effect of the data source of the length-atage data on growth models fitted to Panopea globosa was evaluated. Five growth models were tested: von Bertalanffy, logistic, Gompertz, Schnute, and Schnute-Richards. The parameters of each model and their confidence intervals (CIs) were computed using the maximum likelihood method. Multimodel inference was used to average the asymptotic length for each area. The bestfitting model was selected using Akaike's information criterion (AIC). According to this criterion, the logistic growth model best described the growth of P. globosa in unexploited beds, and the Schnute models performed best in exploited beds. The asymptotic length values obtained frommultimodel inferencewere 161.88 mm (95% CI, 161.83-161.93 mm) in unexploited beds and 205.20 mm (95% CI, 197.60-212.96 mm) in exploited beds. The latter value is the largest asymptotic length obtained for any Panopea species worldwide. In conclusion, the data source of the length-at-age data clearly affects the performance of growth models.

Morzaria-Luna H.N.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos | Turk-Boyer P.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos | Rosemartin A.,National Coordinating Office | Rosemartin A.,University of Arizona | Camacho-Ibar V.F.,Autonomous University of Baja California
Ocean and Coastal Management | Year: 2014

The ecosystem functions and environmental services provided by coastal wetlands are threatened by climate change and other anthropogenic impacts. Assessing the degree of vulnerability and the nature and extent of probable impacts of climate change on coastal wetlands is necessary to develop adaptation strategies. Here we review and synthesize existing scientific information to examine climate change impacts on physical and biotic processes of hypersaline salt marshes in the Northern Gulf of California, Mexico. In this region, negative estuaries provide nursery and refuge for migratory species and sustain important fisheries. We found marshes in the Northern Gulf may be susceptible to the effects increased CO2, sea-level rise, storm frequency and intensity, changes in ambient temperature, and ocean physical changes, including elevated sea temperature, and acidification. The responses of coastal marshes to these climate change effects will likely be interactive and hard to predict; climatic interannual variability (i.e. El Niño-Southern Oscillation) will play an important role in determining the strength and directionality of the impacts. Given the uncertainty of climate change effects, it will be important to continue ongoing monitoring programs and implement new ones that help separate natural variability from the effects of climate change. Management actions and adaptation plans will be needed that consider uncertainty, are flexible, and encourage ongoing learning. Our study is a first step toward understanding vulnerability of coastal wetlands in the Northern Gulf of California to climate change. © 2014 Elsevier Ltd.

Morzaria-Luna H.N.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos | Castillo-Lopez A.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos | Danemann G.D.,Marine Conservation and Sustainable Fishing Program | Turk-Boyer P.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos
Wetlands Ecology and Management | Year: 2014

Wetlands worldwide, the fisheries they support, and the communities that depend on them are threatened by habitat modification. We describe strategies being used for wetland conservation in the Gulf of California, Mexico, their effectiveness, and challenges for implementation. We base our analysis on the authors' experience working for local environmental non-governmental organizations and available literature. The strategies discussed include public and private policy instruments such as Environmental Impact Evaluations, environmental land easements, concessions and transfer agreements, Natural Protected Areas, and international agreements such as the Ramsar convention and the North American Wetlands Conservation Act. We present examples from the Gulf of California that highlight some of the challenges to wetland conservation. These challenges range from governmental failure to enforce existing environmental legislation, lack of verification of requirements for development projects, to low economic penalties for wetland modification or destruction. We found that in the Gulf of California successful conservation of coastal wetlands required a combination of policy instruments and relied on integrating science, management, and public participation through partnerships between non-governmental institutions, academic institutions, community stakeholders, and government agencies. © 2013 Springer Science+Business Media Dordrecht.

Morzaria-Luna H.N.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos | Turk-Boyer P.,Centro Intercultural Of Estudios Of Desiertos Y Oceanos | Moreno-Baez M.,University of California at San Diego
Marine Policy | Year: 2014

Marine fisheries support the livelihoods of millions of people worldwide. These fisheries and the communities that depend on them are highly vulnerable to climate change and other interacting anthropogenic threats. The cumulative and interacting effects of these stressors could potentially produce declines in fish production, which would significantly impact artisanal fishers. Assessing relative vulnerability of fishing communities to anthropogenic stressors is an important first step to identifying mitigation or adaptation strategies. This study assessed the vulnerability of 12 coastal communities in the Northern Gulf of California to disruptions in fishing activities from anthropogenic stressors, including climate change. The Northern Gulf is a megadiverse area and a major source of fishery resources. Quantitative indicator indices based on secondary and primary data were developed to assess the three aspects of vulnerability: sensitivity, exposure, and adaptive capacity. The key components of vulnerability varied amongst communities. Vulnerability was higher in communities with higher fishing dependence and lower socioeconomic diversification. The approach presented here provides important insights into the type of policy actions that might be needed in different communities for adaptation and mitigation. © 2013 Elsevier Ltd.

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