ISSN:
1573-5117
Keywords:
pH
;
temperature
;
Hyalella
;
bioassay
;
lethality
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Field observations on temperature and pH of a small pond showed that a amphipod population of Hyalella azteca was exposed to variable seasonal pH between 5.10–5.85, and water temperatures between 2–21 °C. Laboratory experiments were designed to simulate seasonal temperatures and field pHs of a small pond habitat. Laboratory bioassay experiments were conducted to determine the survival of Hyalella azteca at pHs 4, 5, 6 and 7, and varying temperatures of 5°, 10°, 15°, 20° and 25 °C. The LT100 at pH 4 and 25 °C was 5.7 ± 0.47 days, compared to 47.3 ± 2.49 days at 5 °C. An Analysis of Variance (ANOVA) showed temperature was a significant (p 〉 0.0001) source of variation in the acute lethality of pH to H. azteca. A Duncans Multiple Range Test (DMRT) further showed that in laboratory experiments at pH 4, there was a significant difference (α = 0.01) between the LT100s at 5°, 10°, 15° and 20 °C, but not between temperatures 20° and 25 °C.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00014312
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