Effects of two oil dispersants on phototaxis and swimming behaviour of barnacle larvae

Shiu Sun Rudolf WU, P. K. S. LAM, B. S. ZHOU

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21 Citations (Scopus)

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. The 24 and 48-hour LC50 values for Vecom B-1425 GL:diesel mixture were 514 and 48 mg 1-1 respectively, while respective values for Norchem OSD-570:diesel mixture were 505 and 71 mg 1-1. 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-1425 GL:diesel mixtures of 400 mg 1-1 and higher for 24 hours. A longer exposure time of 48 hours further reduced the Lowest Observable Effect Concentrations (LOECs) to 60 mg 1-1. The LOECs for Norchem OSD-570:diesel mixtures under exposure periods of 24 and 48 hours were 400 and 80 mg 1-1 respectively. The curvilinear velocities (VCL) and straight-line velocities (VSL) of the stage II nauplii ranged from 0.7-1.1 and 0.2-0.4 mm s-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 mg 1-1 caused significant increases in VCL, but no significant change in VSL. Dispersant:diesel mixtures of 100 mg 1-1 and higher resulted in a reduction in VSL for both dispersants. Copyright © 1997 Kluwer Academic Publishers.

Original languageEnglish
Pages (from-to)9-16
JournalHydrobiologia
Volume352
Issue number1-3
DOIs
Publication statusPublished - Sep 1997

Fingerprint

phototaxis
swimming behavior
dispersant
Cirripedia
diesel
larva
oils
oil
larvae
lowest observed effect level
nauplii
Balanus amphitrite
exposure duration
diesel fuel
effect
lethal concentration 50

Citation

Wu, R. S. S., Lam, P. K. S., & Zhou, B. S. (1997). Effects of two oil dispersants on phototaxis and swimming behaviour of barnacle larvae. Hydrobiologia, 352(1-3), 9-16. doi: 10.1023/A:1003024500609

Keywords

  • Oil dispersant
  • Phototaxis
  • Swimming behaviour
  • Barnacle larvae