Salinity, Temperature, and Seasonality Effects on the Metabolic Rate of the Brown Shrimp Farfantepenaeus aztecus (Ives, 1891) (Decapoda, Penaeidae) from the Coastal Gulf of Mexico

Crustaceana ◽  
2011 ◽  
Vol 84 (12-13) ◽  
pp. 1547-1560 ◽  
Author(s):  
Samuel Gómez-Aguirre ◽  
Ignacio D. González-Mora ◽  
Luis A. Soto ◽  
José R. Latournerié ◽  
Alma R. Estrada-Ortega
Keyword(s):  
Gulf Of Mexico ◽  
Metabolic Rate ◽  
Time Of Day ◽  
Brown Shrimp ◽  
Partial Replacement ◽  
Routine Metabolic Rate ◽  
Seasonal Temperature ◽  
Farfantepenaeus Aztecus ◽  
Seasonal Temperature Variation ◽  
Temperature Ranges

AbstractThe routine metabolic rate (QO2 in mg O2 g−1 DW h−1) was measured in juveniles of the brown shrimp, Farfantepenaeus aztecus (Ives, 1891) at salinity and temperature ranges prevailing during the cold and warm seasons at the coastal lagoon of Tamiahua, Veracruz, Mexico. A semi-closed respirometer was employed, with eight 4-L experimental chambers, each containing two shrimp of similar size and sex. The shrimp were fasting and in the intermoult stage, and acclimated to the chambers for 12 h prior to determining oxygen consumption. Oxygen measurements were taken every two hours with a partial replacement of water and aeration of one hour between readings. In a 24 h cycle, 6 to 8 measurements were made. Relations between QO2 and DW, for the different salinity and temperature conditions tested, were calculated and adjusted to the equation: QO2 = αDWβ. Two-way ANOVA was applied to analyse the effect of salinity, temperature, time of day, and body weight on F. aztecus QO2. Salinity had no significant (p > 0.05) effect upon the shrimp's routine metabolic rate at intervals of 26 to 34 psu and 22 to 36 psu, typical of the cold and warm seasons, respectively. However, seasonal temperature variation did significantly affect the shrimp's QO2, thus suggesting the existence of a different "pattern of acclimatization" in the energy requirements of the individuals from both seasons. The results indicate that the population of F. aztecus from this area of the Gulf of Mexico may represent a "cline", the physiological response of the components of which differs from that of other brown shrimp populations distributed over a wide geographical range in the western tropical Atlantic.

Spatial distribution of brown shrimp (Farfantepenaeus aztecus) on the northwestern Gulf of Mexico shelf: effects of abundance and hypoxia

2005 ◽  
Vol 62 (6) ◽  
pp. 1295-1308 ◽  
Author(s):  
J Kevin Craig ◽  
Larry B Crowder ◽  
Tyrrell A Henwood
Keyword(s):  
Spatial Distribution ◽  
Gulf Of Mexico ◽  
Dissolved Oxygen ◽  
Density Dependence ◽  
Habitat Loss ◽  
Large Scale ◽  
Brown Shrimp ◽  
Density Dependent ◽  
Louisiana Shelf ◽  
Farfantepenaeus Aztecus

We used fishery-independent hydrographic and bottom trawl surveys on the northwestern Gulf of Mexico shelf from 1983–2000 to test for density dependence and effects of hypoxia (dissolved oxygen ≤ 2.0 mg·L–1) on the spatial distribution of brown shrimp (Farfantepenaeus aztecus). Spatial distribution of shrimp was positively related to abundance on the Texas shelf but negatively related to abundance on the Louisiana shelf. Density dependence was weak, however, and may have been due to factors other than density-dependent habitat selection. Males were distributed over a broader area and further offshore than were females, though differences in spatial distribution between sexes were not large (~10%–15%). Large-scale hypoxia (up to ~20 000 km2) on the Louisiana shelf occurs in regions of typically high shrimp density and results in substantial habitat loss (up to ~25% of the Louisiana shelf), with shifts in distribution and associated high densities both inshore and offshore of the hypoxic region. We discuss these results in terms of the generality of density-dependent spatial distributions in marine populations and potential consequences of habitat loss and associated shifts in distribution due to low dissolved oxygen.

scholarly journals ENERGY EXPENDITURE AND PHYSICAL ACTIVITY AMONG OLDER PARTICIPANTS FROM THE MULTICENTER AIDS COHORT STUDY (MACS)

2019 ◽  
Vol 3 (Supplement_1) ◽  
pp. S549-S549
Author(s):  
Jennifer A Schrack ◽  
Todd T Brown ◽  
Joseph B Margolick
Keyword(s):  
Physical Activity ◽  
Metabolic Rate ◽  
Resting Metabolic Rate ◽  
Functional Decline ◽  
Time Of Day ◽  
Energy Utilization ◽  
Hiv Viral Load ◽  
Cross Sectional ◽  
And Function ◽  
Lower Physical Activity

Abstract Energy utilization becomes more inefficient with age and is linked to low physical activity and functional decline. Persons aging with HIV exhibit accelerated functional decline, but the effect of chronic HIV infection on energy utilization and free-living physical activity remains unclear. We investigated cross-sectional associations between age and: resting metabolic rate, peak walking energy (VO2), and 7-day physical activity by accelerometry in 100 men in the MACS (age: 60.8+/-6.8 years, 35% black, 46.1% HIV+, 94% virally suppressed). In multivariable regression models adjusted for age, BMI, race, chronic conditions, and HIV viral load, HIV+ men had a higher resting metabolic rate (β=103.2 kcals/day, p=0.03) and lower peak walking VO2 (β=-1.8 ml/kg/min, p<0.02) than HIV- men. Moreover, HIV+ men demonstrated lower physical activity, overall and by time of day (p<0.05). These results suggest that energy utilization differs by HIV serostatus, which may contribute to lower physical activity and function with aging.

scholarly journals Quantifying sea surface temperature ranges of the Arabian Sea for the past 20 000 years

2011 ◽  
Vol 7 (4) ◽  
pp. 1337-1349 ◽  
Author(s):  
G. M. Ganssen ◽  
F. J. C. Peeters ◽  
B. Metcalfe ◽  
P. Anand ◽  
S. J. A. Jung ◽  
...  
Keyword(s):  
Arabian Sea ◽  
Isotope Composition ◽  
Planktonic Foraminifera ◽  
Sediment Cores ◽  
Maximum Temperature ◽  
Physical Parameters ◽  
Seasonal Temperature ◽  
Mean Values ◽  
The Past ◽  
Temperature Ranges

Abstract. The oxygen isotopic composition of planktonic foraminifera tests is one of the widest used geochemical tools to reconstruct past changes of physical parameters of the upper ocean. It is common practice to analyze multiple individuals from a mono-specific population and assume that the outcome reflects a mean value of the environmental conditions during calcification of the analyzed individuals. Here we present the oxygen isotope composition of individual specimens of the surface-dwelling species Globigerinoides ruber and Globigerina bulloides from sediment cores in the Western Arabian Sea off Somalia, inferred as indicators of past seasonal ranges in temperature. Combining the δ18O measurements of individual specimens to obtain temperature ranges with Mg/Ca based mean calcification temperatures allows us to reconstruct temperature extrema. Our results indicate that over the past 20 kyr the seasonal temperature range has fluctuated from its present value of 16 °C to mean values of 13 °C and 11 °C for the Holocene and LGM, respectively. The data for the LGM suggest that the maximum temperature was lower, whilst minimum temperature remained approximately constant. The rather minor variability in lowest summer temperatures during the LGM suggests roughly constant summer monsoon intensity, while upwelling-induced productivity was lowered.

scholarly journals ESTIMACIÓN DE LA ABUNDANCIA DE CAMARÓN CAFÉ (Farfantepenaeus aztecus) EN LAS COSTAS DE TAMAULIPAS, 2002

2005 ◽  
Vol 20 (1-2) ◽  
pp. 17
Author(s):  
A. T. Wakida Kusunoki ◽  
R. Solana Sansores ◽  
A. González-Cruz
Keyword(s):  
Size Structure ◽  
Brown Shrimp ◽  
Laguna Madre ◽  
Farfantepenaeus Aztecus ◽  
Open Sea ◽  
Distant Zone ◽  
El Sistema ◽  
Rain Fall ◽  
Swept Area

Se presentan los resultados de la evaluación de la abundancia de camarón café (Farfantepeneaus aztecus ) en las costas de Tamaulipas durante el verano de 2002. Se realizaron cuatro cruceros de pesca exploratoria en las costas de Tamaulipas en agosto en donde se analizaron los valores de biomasa por área barrida. Estos valores fueron comparados con los obtenidos en cruceros de pesca exploratoria previos. La información fue complementada con datos de la estructura por tallas observadas durante mayo en Laguna Madre y tallas capturadas durante julio en altamar. Los resultados muestran que los rendimientos de la captura y la bio masa existentes son menores a los meses anteriores. Asi mismo, la estructura de tallas en el sistema lagunar, en la costa y la zona lejana a la costa (20 m a 42 m de profundidad) muestran un retraso en el reclutamiento y una desaceleración en el crecimiento, posiblemente como resultado de la anormalidad en la temperatura y la precipitación. Los valores bajos de la bio masa y las tallas observadas provocaron que los rendimientos en las capturas comerciales de altamar fueran menores a lo esperado. Abundance as sessment of brown shrimp (Farfantepenaeus aztecus) in Tamaulipas coasts, 2002 Results from brown shrimp (Farfantepenaeus aztecus ) abundance evaluation of the coasts of Tamaulipas during summer of 2002 are presented. Four exploratory fishing cruises were carried out in the coasts Tamaulipas during August, where bio mass values were analyzed by swept area. These values were compared with data of previous exploratory fishing cruises. The information was complemented with data of size structure, observed during May in Laguna Madre and information from a survey carried out in June 2001. The results shown that the yield of capture and bio mass existing are smaller than the previous months. Likewise, the structure of sizes in the inshore system, from the coast and the distant zone to the coast (20 m to 42 m depth) shown a de lay in the recruit ment and abundance on decrease, possibly explained as a result of a temperature and rain fall abnormality. The low values observed of bio mass and sizes, caused that yields in the commercial captures of open sea were smaller than the expected ones.

Testing the “rate of living” model: further evidence that longevity and metabolic rate are not inversely correlated in Drosophila melanogaster

2004 ◽  
Vol 97 (5) ◽  
pp. 1915-1922 ◽  
Author(s):  
Wayne A. Van Voorhies ◽  
Aziz A. Khazaeli ◽  
James W. Curtsinger
Keyword(s):  
Drosophila Melanogaster ◽  
Metabolic Rate ◽  
Recombinant Inbred ◽  
Recombinant Inbred Lines ◽  
Time Of Day ◽  
Metabolic Rates ◽  
Extended Longevity ◽  
Flow Through ◽  
The Relationship

In a recent study examining the relationship between longevity and metabolism in a large number of recombinant inbred Drosophila melanogaster lines, we found no indication of the inverse relationship between longevity and metabolic rate that one would expect under the classical “rate of living” model. A potential limitation in generalizing from that study is that it was conducted on experimental material derived from a single set of parental strains originally developed over 20 years ago. To determine whether the observations made with those lines are characteristic of the species, we studied metabolic rates and longevities in a second, independently derived set of recombinant inbred lines. We found no correlation in these lines between metabolic rate and longevity, indicating that the ability to both maintain a normal metabolic rate and have extended longevity may apply to D. melanogaster in general. To determine how closely our measurements reflect metabolic rates of flies maintained under conditions of life span assays, we used long-term, flow-through metabolic rate measurements and closed system respirometry to examine the effects of variables such as time of day, feeding state, fly density, mobility of the flies, and nitrogen knockout on D. melanogaster metabolic rate. We found that CO2 production estimated in individual flies accurately reflects metabolic rates of flies under the conditions used for longevity assays.

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