Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 7-Day Trial for You or Your Team.

Learn More →

Population growth of Daphnia magna under multiple stress conditions: Joint effects of temperature, food, and cadmium

Population growth of Daphnia magna under multiple stress conditions: Joint effects of... Aquatic organisms in the field often are exposed to combinations of stress factors of variousorigins. Little is known of the interaction between different types of stressors; hence, the predictability of their joint effects is low. Therefore, the present study analyzed the joint effects of temperature, food, and cadmium on the population growth rate of the water flea Daphnia magna. The results revealed that temperature, food, and cadmium, as well as their interactions, were important factors that influenced life‐history parameters and, as a consequence, the population growth rate of D. magna. In general, population growth rate increased at high temperature and food level but decreased when cadmium was present. The positive effect of temperature on population growth rate was smallest at limiting food levels. Negative effects of cadmium on the growth rate were enhanced at elevated temperatures, whereas high food levels protected the daphnids from adverse effects of cadmium. To avoid over‐ or underestimation regarding the toxicity of substances to field populations, results of standard toxicity tests should be applied in a location‐specific way. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Toxicology and Chemistry Oxford University Press

Population growth of Daphnia magna under multiple stress conditions: Joint effects of temperature, food, and cadmium

Download PDF
9 pages

Loading next page...
 
/lp/oxford-university-press/population-growth-of-daphnia-magna-under-multiple-stress-conditions-nhHeymGZY7

References (33)

Publisher
Oxford University Press
Copyright
Copyright © 2006 SETAC
ISSN
0730-7268
eISSN
1552-8618
DOI
10.1897/05-294r.1
Publisher site
See Article on Publisher Site

Abstract

Aquatic organisms in the field often are exposed to combinations of stress factors of variousorigins. Little is known of the interaction between different types of stressors; hence, the predictability of their joint effects is low. Therefore, the present study analyzed the joint effects of temperature, food, and cadmium on the population growth rate of the water flea Daphnia magna. The results revealed that temperature, food, and cadmium, as well as their interactions, were important factors that influenced life‐history parameters and, as a consequence, the population growth rate of D. magna. In general, population growth rate increased at high temperature and food level but decreased when cadmium was present. The positive effect of temperature on population growth rate was smallest at limiting food levels. Negative effects of cadmium on the growth rate were enhanced at elevated temperatures, whereas high food levels protected the daphnids from adverse effects of cadmium. To avoid over‐ or underestimation regarding the toxicity of substances to field populations, results of standard toxicity tests should be applied in a location‐specific way.

Journal

Environmental Toxicology and Chemistry – Oxford University Press

Published: May 1, 2006

There are no references for this article.