Two concentrations of the domestic detergent, 2 and 4 mg/l, and one of LAS, 0.8 mg/l, which corresponds roughly to the amount contained in 4 mg of the commercial powder, were tested. Males and females were put into test solutions immediately after having reached sexual maturity, and left there until the first egg sac appeared in females, that is for two to six days. Ovigerous females were then isolated in water without detergent and the number of nauplii produced by the first egg sac was counted. The effect of these detergents depends on the crowding level. When 1 male and 1 female were put in one vessel with 20 ml of water, the presence of the pollutant induced a reduction of the mean number of nauplii, which did not occur in the controls. When 8 males and 8 females were put in the same volume of water, the pollutants induced an increase of the number of nauplii. It is suggested that these apparently paradoxical results depend on two different actions of the detergents. First, they may affect the exchange of gases, so that the following reduced oxygenation may damage the developing eggs. On the other hand, these pollutants appear to remove the mechanism that enables the animals to perceive and to react to crowding. This agrees with a previous hypothesis that the above mechanism might depend on the production by Tisbe of some specific chemical, so far unidentified. Thus, the detergent may interact with such substances and/or damage the chemoreceptors of the animals. In all cases LAS appears to be responsible for the phenomena observed.
@article{RLINA_1979_8_66_3_223_0,
author = {Giancarlo Fava and Eugenio Crotti},
title = {Effetto di un detersivo commerciale e di uno dei suoi componenti, LAS, sulla produzione di nauplii in Tisbe holothuriae (Copepoda, Harpacticoida) in condizioni di alto e basso affollamento},
journal = {Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti},
volume = {66},
year = {1979},
pages = {223-231},
language = {it},
url = {http://dml.mathdoc.fr/item/RLINA_1979_8_66_3_223_0}
}
Fava, Giancarlo; Crotti, Eugenio. Effetto di un detersivo commerciale e di uno dei suoi componenti, LAS, sulla produzione di nauplii in Tisbe holothuriae (Copepoda, Harpacticoida) in condizioni di alto e basso affollamento. Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti, Tome 66 (1979) pp. 223-231. http://gdmltest.u-ga.fr/item/RLINA_1979_8_66_3_223_0/
, e (1965) - Detergents: effects on the chemical senses of the fish Ictalurus natalis (le Sueur). «Science», 148, 1605-1607.
(1973) - Évaluation de la pollution par les détergents anioniques en cinq zones du littoral français. «Rev. Trav. Inst. Pêches marit.», 37, 429-469.
e (1976) - Effetti di un detersivo commerciale in copepodi del genere Tisbe (Copepoda, Harpacticoida). «Atti Ist. veneto Sci.», 134, 221-237.
e (1975) - Tisbe (Copepoda: Harpacticoida) species from the lagoon of Venice. I. Seasonal fluctuations and ecology. «Mar. Biol.», 30, 151-165.
(1972) - Development and growth of eggs and larvae of Mytilus edulis exposed to a linear dodecylbenzenesulphonate, LAS. «Mar. Biol.», 13, 356-358.
, , e (1967) - L'inquinamento delle acque del mare nell'Alto Adriatico. II. Ricerche chimiche. «Archo Oceanogr. Limnol.», 13, suppl., 125-134.
, , , e (1969 a) - L'inquinamento delle acque del mare nell'Alto Adriatico. Nota II. Studio della zona compresa tra le foci del Po e Ravenna. «L'Igiene Moderna», 62, 590-613.
, , , e (1969 b) - L'inquinamento delle acque del mare nell'Alto Adriatico. Nota III. Studio della laguna veneta e della zona di mare ad essa prospicente. «L'Igiene Moderna», 62, 715-749.
, , e (1971) - Biological effects of surface active agents on marine animals. «Mar. Biol.», 9, 183-201.