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Mexicali, Mexico

Leon-Chavez C.A.,National Autonomous University of Mexico | Beier E.,Research Center Cientifica Educacion Superior Of Ensenada | Sanchez-Velasco L.,CICIMAR IPN | Barton E.D.,Instituto Investigaciones Marinas CSIC | Godinez V.M.,Research Center Cientifica Educacion Superior Of Ensenada
Journal of Geophysical Research C: Oceans | Year: 2015

On the basis of five oceanographic cruises carried out in the Eastern Tropical Pacific off Mexico, relationships between the larval fish habitats (areas inhabited by larval fish assemblages) and the environmental circulation scales (mesoscale, seasonal, and interannual) were examined. Analysis of in situ data over a grid of hydrographic stations and oblique zooplankton hauls with bongo net (505 μm) was combined with orthogonal robust functions decomposition applied to altimetry anomalies obtained from satellite. During both cool (March and June) and warm (August and November) periods, Bray-Curtis dissimilarity Index defined three recurrent larval fish habitats which varied in species composition and extent as a function of the environmental scales. The variability of the Tropical larval fish habitat (characterized by high species richness, and dominated by Vinciguerria lucetia, Diogenichthys laternatus, and Diaphus pacificus) was associated with the seasonal changes. The Transitional-California Current larval fish habitat (dominated by V. lucetia and D. laternatus, with lower mean abundance and lower species richness than in the Tropical habitat) and Coastal-and-Upwelling larval fish habitat (dominated by Bregmaceros bathymaster) was associated mainly with mesoscale activity induced by eddies and with coastal upwelling. During February 2010, the Tropical larval fish habitat predominated offshore and the Transitional-California Current larval fish habitat was not present, which we attribute to the effect of El Niño conditions. Thus, the mesoscale, seasonal, and interannual environmental scales affect the composition and extension of larval fish habitats. Key Points: Variability of larval fish habitats in the Eastern Tropical Pacific Water masses and larval fish habitats in the Eastern Tropical Pacific ENSO influences in the larval fish habitats in the Eastern Tropical Pacific © 2015. American Geophysical Union. All Rights Reserved. Source


Gomez-Munoz V.M.,CICIMAR IPN | Porta-Gandara M.A.,Engineering Group CIBNOR | Fernandez J.L.,National Autonomous University of Mexico
Landscape and Urban Planning | Year: 2010

The present study is carried out for dry hot climate places, where excessive solar heating is felt throughout the year. The effect of tree shadowing buildings is found to reduce heating loads; hence trees have a beneficial effect in energy economics. The emerging economic value of tree shadows in hot climate cities grants the development of an appropriate simulation numerical method to establish relative advantages on energy savings related to dwelling envelopes. The results demonstrate that large trees can provide up to 70% shade during spring and autumn, thus saving a very large amount of energy along the whole year. Hence, economic value of larger trees is greater than that of younger species. © 2009 Elsevier B.V. All rights reserved. Source


Mucino-Marquez R.E.,Metropolitan Autonomous University | Garate-Lizarraga I.,CICIMAR IPN | Lopez-Cortes D.J.,CIBNOR
Acta Biologica Colombiana | Year: 2015

The genus Prorocentrum Ehrenberg includes 81 marine species, of which 21 are considered causative agents of harmful algal blooms, and approximately 9 species produce toxins. The objectives of this study were to determine distribution and abundance of Prorocentrum species during an annual cycle at two sampling sites within tuna farms near San Juan de La Costa (SC), Rancheros del Mar (RM) and at a station without the influence of these farms located off El Mogote (M), in the Bahia de la Paz, Gulf of California. Samples were taken monthly (June 2006-May 2007) at different depths at SC (0.25 and 50 m), at the RM (0.15 and 30 m) and at El Mogote (0 m) with a van Dorn bottle. The results showed a total of twelve species in the annual cycle: P. compressum, P. dactylus, P. emarginatum, P. gracile, P. lima, P. micans, P. minimum, P. rhathymum, P. rostratum, P. shikokuense, P. triestinum and P. vaginula, of which the first eight form blooms. The study of Prorocentrum blooms became important because they have been linked to widespread harmful ecosystem impacts. © 2015, Universidad Nacional de Colombia. All rights reserved. Source


The seasonal variability of sea surface temperature (SST) in the Magdalena-Almejas Bay lagoon system (Mexico) and adjacent oceanic region was characterized in terms of the averaged monthly SST distributions obtained from AVHRR satellite images during the period 1996-2001. Additionally, oceanographic data obtained during five sampling campaigns were analyzed. A regional subdivision of the study area was made in relation to the main physical processes affecting the thermohaline structure, such as upwelling, tidal transport, and surface heat fluxes. Annual cycles of monthly mean SST for these subregions showed that during the period from April to September the inner lagoon water was warmer than the adjacent oceanic water, with a maximum difference of 1.3°C in June. During the period from October to February, the SST inside the lagoon system was lower than in the adjacent ocean (by up to -1.5°C in December). These results are discussed in terms of upwelling activity in the adjacent oceanic region and winter cooling effects on the surface, particularly in Almejas Bay. Most of the system (about 70% of its surface) is characterized by vertical homogeneity. Thermohaline stratification modulated by coastal upwelling activity in the adjacent oceanic region is observed in the deepest part of the lagoon system (>15 m), especially during the spring and summer. The oceanic conditions frequently observed in this subregion of Magdalena Bay are hypothetically explained by the combined action of coastal upwelling and horizontal tidal transport. These local effects were more evident during the flood, when a strong tidal flow (up to 1.1 m s-1) produced intense vertical mixing of near-bottom cold water with upper layer water leading to reduced SST values. Source


Sandoval S.,CICIMAR IPN | Gomez-Munoz V.,CICIMAR IPN | Gutierrez J.,Engineering Group | Porta-Gandara M.T.,Engineering Group
Journal of Thermal Biology | Year: 2011

Several studies have reported the importance of metabolic heat on the increment of temperature in the sea turtle nests; however, the metabolic heat has not been calculated for sea turtle eggs. In this study, the metabolic heat generated by embryos of the sea turtle Lepidochelys olivacea was estimated from a thermal balance model by means of three measured temperatures-one in the center of the nest, and the others in the sand above and beside the nest. An experiment was conducted with a sample of 100 eggs from a Lepidochelys olivacea nest collected in the Baja Peninsula, Mexico. The results showed that during the incubation period, no metabolic heat was detected before day 19 but it increased from that day until a maximum of 0.84. W at day 34, when the incubation process was interrupted due to rain. This value corresponds to 31 emerged hatchlings. The novel model is a suitable framework to predict the temperature and metabolic heat within the nest. © 2011 Elsevier Ltd. Source

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