Increased susceptibility to No. 2 fuel oil coincident with initiation of particle feeding in developing mud snails, Ilyanassa obsoleta

Encapsulated embryos and free-living larvae of Ilyanassa obsoleta were exposed to concentrations of No. 2 fuel oil (water-accommodated fraction, WAF) up to 1.0 ppm. Development of velum pigmentation and release of larvae from egg capsules were delayed in the presence of 1.0 ppm WAF, but exposure to...

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Bibliographic Details
Published in:Estuaries 1983-01, Vol.6 (3), p.237-242
Main Authors: Pechenik, J.A, Miller, D.C
Format: Article
Language:English
Subjects:
animal diseases
animal health
aquatic organisms
Brackish
Capsules
Eggs
Embryos
Fuel oils
Hydrocarbons
Ilyanassa obsoleta
Larvae
Larval development
Mortality
noninfectious diseases
Phytoplankton
Sea water
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Summary:Encapsulated embryos and free-living larvae of Ilyanassa obsoleta were exposed to concentrations of No. 2 fuel oil (water-accommodated fraction, WAF) up to 1.0 ppm. Development of velum pigmentation and release of larvae from egg capsules were delayed in the presence of 1.0 ppm WAF, but exposure to the oil did not increase developmental mortality of encapsulated individuals. Individuals which were prematurely removed from egg capsules and exposed to oil directly suffered no mortality until yolk reserves were depleted and feeding on phytoplankton commenced. Feeding, free-living larvae suffer high mortality at 1.0 ppm WAF. The reduced susceptibility of encapsulated embryos to the oil stress may therefore reflect the importance of toxicant uptake by ingestion (as opposed to diffusion) rather than the degree of protection afforded by encapsulation.
ISSN:0160-8347
1559-2758
DOI:10.2307/1351515