Variations between winter and summer in the toxicity of copper to a population of the mysid Praunus flexuosus |
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Authors: | E Garnacho L S Peck P A Tyler |
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Institution: | (1) School of Ocean and Earth Science, Southampton Oceanography Centre, European Way, Southampton S014 3ZH, Hants, England Fax: 004 (0) 1703 593 059 e-mail: pat8@soc.soton.ac.uk, GB;(2) N.E.R.C. British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 9EU, England, GB |
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Abstract: | Copper toxicity was tested on a coastal population of the mysid Praunus flexuosus (Müller) from Southampton Water (Southern England) under winter and summer conditions. Ten-day toxicity tests were performed
on the different life-cycle stages (female, male and juvenile) present in winter (December/February) and summer (August).
The individuals were in winter or summer physiological condition and were exposed to seawater to which 0, 5, 25, 75 and 200 μg l−1 copper was added. There were significantly different copper toxicity effects in winter and summer. In winter mortality was
≤ 1% at all levels of copper exposure, while in summer identical exposure levels caused mortality of up to 93%. The 96 h LC50 was 30.8 μg l−1 copper added in the summer. In winter, the low mortality prevented calculation of LC50. There were differences in responses to copper between the life-cycle stages. Juveniles were more sensitive than adults,
and were severely affected within 24 h. Females were more affected than males at lower doses and shorter exposure times.
Received: 28 April 1999 / Accepted: 22 June 2000 |
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