ISSN:
1573-5117
Keywords:
Oil dispersant
;
phototaxis
;
swimming behaviour
;
barnacle larvae
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The effects of two oil dispersants (Vecom B-1425 GL and Norchem OSD-570) mixed with diesel oil on the survival and behaviour of the stage II nauplii of the barnacle Balanus amphitrite were investigated. The24 and 48-hour LC50 values for Vecom B-1425 GL:diesel mixture were 514 and 48 mg l−1 respectively, while respective values for Norchem OSD-570:diesel mixture were 505 and 71 mg l−1. Under sublethal concentrations, increased levels of the dispersant:diesel mixtures caused a reduction in phototactic responses. Balanus amphitrite nauplii failed to exhibit phototactic responses when exposed to Vecom B-1425GL:diesel mixtures of 400 mg l−1 and higher for 24 hours. A longer exposure time of 48 hours further reduced the Lowest Observable Effect Concentrations (LOECs) to 60 mg l−1. The LOECs for Norchem OSD-570:diesel mixtures under exposure periods of 24 and 48 hours were 400and 80 mgl−1 respectively. The curvilinear velocities (VCL) and straight-line velocities (VSL) of the stage II nauplii ranged from 0.7–1.1and 0.2-0.4 mms−1 respectively. Increased concentrations of dispersant:diesel mixtures caused a significant change in the curvilinear and straight-line velocities. Both oil dispersants, dispersant:diesel mixtures of 20 to 40 mgl−1 caused significant increases in VCL, but no significant change in VSL. Dispersant:diesel mixtures of 100 mg l−1 and higher resulted in a reduction in VSL for both dispersants.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1003024500609
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