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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

Salinity, Temperature, and Seasonality Effects on the Metabolic Rate of the Brown Shrimp... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crustaceana Brill

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

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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0011-216X
eISSN
1568-5403
DOI
10.1163/156854011x605738
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Crustaceana – Brill

Published: Jan 1, 2011

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