Daily variations of temperature, salinity, dissolved oxygen and chlorophyll a, in a hypersaline lagoon of the Gulf of California

Holguín, José Eduardo Valdez

doi:10.7773/cm.v20i2.965

Cited by 11 publications

(5 citation statements)

References 4 publications

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“…Feeding of pen shells is affected by variations in concentrations of POM and PIM (Safi et al 2007); for example, a strong relationship between tissue growth and availability of food, as measured by organic seston matter, has been documented in P. carnea (Narváez et al 2000). Although seston as well as concentrations of chlorophyll a at our study site showed similar ranges as those reported in other lagoons of the region (Valdez‐Holguín 1994; Barrios‐Ruíz et al 2003), no correlation of these parameters with the measurements of somatic growth was detected in our study. Nevertheless, the concentration of seston and chlorophyll may suggest that availability of food was not a limiting factor for growth of A. maura .…”

Section: Discussionsupporting

confidence: 72%

Cultivation of Pen Shells: An Example with Atrina maura in Northwestern Mexico

Leal-Soto¹,

Barraza-Guardado²,

Castro‐Longoria³

et al. 2011

J World Aquaculture Soc

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Pen shells are economically important and most are threatened by overexploitation and habitat degradation. Cultivation represents an alternative for preserving the resource and increasing the production. Atrina maura was cultivated in a suspension system which was followed by a bottom phase. Samples of pen shells and tissues were collected monthly to measure absolute growth, shell height increase, and an adductor muscle index. After the trials, adults shell height was 195 ± 10 mm, total weight was 223 ± 28 g, and mean shell height increase was 0.81 cm/mo. Protective devices were vital to avoid predation by crabs and fish; survival was 90% in the suspension phase and 70% in the bottom phase. Variations in the muscle index were apparently related to reproduction, suggesting activity (partial spawning)

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Section: Discussionsupporting

confidence: 72%

Cultivation of Pen Shells: An Example with Atrina maura in Northwestern Mexico

Leal-Soto¹,

Barraza-Guardado²,

Castro‐Longoria³

et al. 2011

J World Aquaculture Soc

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“…and biological (e.g. the balance between photosynthesis and respiration) phenomena [26] , [27] . Further investigation into the physical characteristics of the natural hypersaline environment of halophilic archaea provided clues into the potential implication of light-mediated entrainment of oxygen-associated physiologies.…”

Section: Resultsmentioning

confidence: 99%

Diurnally Entrained Anticipatory Behavior in Archaea

et al. 2009

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By sensing changes in one or few environmental factors biological systems can anticipate future changes in multiple factors over a wide range of time scales (daily to seasonal). This anticipatory behavior is important to the fitness of diverse species, and in context of the diurnal cycle it is overall typical of eukaryotes and some photoautotrophic bacteria but is yet to be observed in archaea. Here, we report the first observation of light-dark (LD)-entrained diurnal oscillatory transcription in up to 12% of all genes of a halophilic archaeon Halobacterium salinarum NRC-1. Significantly, the diurnally entrained transcription was observed under constant darkness after removal of the LD stimulus (free-running rhythms). The memory of diurnal entrainment was also associated with the synchronization of oxic and anoxic physiologies to the LD cycle. Our results suggest that under nutrient limited conditions halophilic archaea take advantage of the causal influence of sunlight (via temperature) on O2 diffusivity in a closed hypersaline environment to streamline their physiology and operate oxically during nighttime and anoxically during daytime.

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“…Dado que el crecimiento de los juveniles en los sitios de producción coincide con las temperaturas extremas, el equilibrio fisiológico de los ostiones puede verse amenazado. Además, las variaciones de temperatura a su vez afectan otras variables hidrológicas estacionales, especialmente la biomasa fitoplanctónica (Valdez-Holguín 1994). No se sabe con precisión la importancia relativa de la temperatura y la disponibilidad de alimento sobre el crecimiento y la condición de los ostiones, en particular durante las etapas juveniles (Barraza-Guardado et al 2008).…”

Section: Experimental Design and Samplingunclassified

“…Las semillas de la especie nativa y la introducida son transportadas a los cultivos comerciales durante los mismos periodos, pero no se han hecho estudios en que se hayan comparado directamente crecimiento, rendimiento y supervivencia de ambas especies. Sorprendentemente, existe poca información sobre los efectos de las variaciones ambientales de factores abióticos y bióticos sobre el crecimiento y la supervivencia que for other seasonal hydrological fluctuations, especially that of phytoplankton biomass (Valdez-Holguín 1994). The relative importance of temperature and food availability for the growth and condition of oysters, particularly during juvenile stages, is not precisely understood (Barraza-Guardado et al 2008).…”

Section: Introductionunclassified

Comparative growth, condition, and survival of juvenile Crassostrea gigas and C. corteziensis oysters cultivated in summer and winter

et al. 2010

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We report differences in growth, condition, and survival of the Pacific oyster Crassostrea gigas and the Cortez oyster C. corteziensis cultivated in a semi-arid lagoon in northwestern Mexico (Las Guásimas, Sonora) during summer and winter, periods corresponding to juvenile development at the production sites. Three sampling stations were established to determine variations in temperature, salinity, seston, chlorophyll a content, oxygen concentration, and pH at the coastal system. Growth rates and condition indices were higher during winter and cumulative mortality was higher in summer. This was the pattern for both species though significant differences were noted only for C. gigas. The Pacific oyster showed faster growth in winter and slower in summer than the Cortez oyster. While food availability was not a limiting factor in any season, differences in growth, condition, and survival were related to temperature, which ranged from a maximum of 32.7°C in summer to a minimum of 12.7°C in winter. Low temperatures are propitious for C. gigas, since high temperatures cause physiological stress. The Cortez oyster has the ability to adapt its metabolic functions to variations in temperature with no differences in growth and condition during the extreme seasons. The Pacific oyster exhibited better adaptation to variations in conditions at sites like Las Guásimas, but high temperature is a limiting factor for cultivation. Autumn is a propitious period to begin cultivating C. gigas, while the native C. corteziensis can be cultivated year-round.

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Daily variations of temperature, salinity, dissolved oxygen and chlorophyll a, in a hypersaline lagoon of the Gulf of California

Cited by 11 publications

References 4 publications

Cultivation of Pen Shells: An Example with Atrina maura in Northwestern Mexico

Cultivation of Pen Shells: An Example with Atrina maura in Northwestern Mexico

Diurnally Entrained Anticipatory Behavior in Archaea

Comparative growth, condition, and survival of juvenile Crassostrea gigas and C. corteziensis oysters cultivated in summer and winter

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