Abstract
Summary Male Gametes Of The Two Marine Brown Algae Ectocarpus siliculosus And Cutleria Multifida Are Attracted By Respective Female Gametes. Several Unsaturated Hydrocarbons are involved In This Interaction: ectocarpen in Ectocarpus and multifiden, accompanied by aucanten and ectocarpen in Cutleria . The response of male gametes to various concentrations of synthesized samples of these substances was examined. The most sensitive interactions found were those between male gametes and their species-specific attractant: Ectocarpus with ectocarpen and Cutleria with multifiden. All other interactions examined, including those with n-hexane, are less sensitive. Cross-combinations of gametes showed that Cutleria females attract Ectocarpus males and vice versa. Male gametes of Cutleria have been found to be attracted much more effectively than those of Ectocarpus . The quantitative data were used to compare isogamy in Ectocarpus with strong anisogamy in Cutleria .
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