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Field studies of ammonia excretion in Aphanius iberus (Pisces; Cyprinodontidae): body size and habitat effects

Field studies of ammonia excretion in Aphanius iberus (Pisces; Cyprinodontidae): body size and... Summary The effects of body size and habitat variability on ammonia excretion rates (RAMs) of Aphanius iberus were analyzed in situ for the first time. At hourly intervals during a 5‐h field experiment, ammonia excretion was measured in 75 mature specimens from three sampling sites (small creek, marine salt‐mine, and salt‐marsh) established in a gradient of water salinity (0–5; 35–40; 65–70‰). Our results showed a specific size dependence pattern of RAMs in the reproduction period, which might reflect an effect of the reproductive effort. In addition, the results point to a significant decrease in mean RAM values of each population from freshwater aquatic systems (3.81 ± 0.58 μmol g−1 h−1 in fish of 2.8 ± 0.3 mm total length, TL) to salt aquatic systems with significantly higher alkalinity (2.52 ± 0.35 μmol g−1 h−1 in fish of 3.1 ± 0.5 mm TL in marine salt‐mine; 1.98 ± 0.55 μmol g−1 h−1 in fish of 3.1 ± 0.4 mm TL in salt‐marsh). Due to the size‐dependent pattern, RAM in different habitats cannot be compared directly; ancova, followed by residual compared analysis (regression‐related techniques), is seen as a valid method for this purpose. This work presents the first field data on ammonia excretion in the Aphanius genus and the flexible physiologic response characteristic of Cyprinodontids has been demonstrated. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Field studies of ammonia excretion in Aphanius iberus (Pisces; Cyprinodontidae): body size and habitat effects

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References (55)

Publisher
Wiley
Copyright
Copyright © 2007 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1111/j.1439-0426.2006.00791.x
Publisher site
See Article on Publisher Site

Abstract

Summary The effects of body size and habitat variability on ammonia excretion rates (RAMs) of Aphanius iberus were analyzed in situ for the first time. At hourly intervals during a 5‐h field experiment, ammonia excretion was measured in 75 mature specimens from three sampling sites (small creek, marine salt‐mine, and salt‐marsh) established in a gradient of water salinity (0–5; 35–40; 65–70‰). Our results showed a specific size dependence pattern of RAMs in the reproduction period, which might reflect an effect of the reproductive effort. In addition, the results point to a significant decrease in mean RAM values of each population from freshwater aquatic systems (3.81 ± 0.58 μmol g−1 h−1 in fish of 2.8 ± 0.3 mm total length, TL) to salt aquatic systems with significantly higher alkalinity (2.52 ± 0.35 μmol g−1 h−1 in fish of 3.1 ± 0.5 mm TL in marine salt‐mine; 1.98 ± 0.55 μmol g−1 h−1 in fish of 3.1 ± 0.4 mm TL in salt‐marsh). Due to the size‐dependent pattern, RAM in different habitats cannot be compared directly; ancova, followed by residual compared analysis (regression‐related techniques), is seen as a valid method for this purpose. This work presents the first field data on ammonia excretion in the Aphanius genus and the flexible physiologic response characteristic of Cyprinodontids has been demonstrated.

Journal

Journal of Applied Ichthyology – Wiley

Published: Feb 1, 2007

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