. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEXUAL PHEROMONES IN APLYSIA 89 100. Egg layer, No eggs Non-conditioned Nonlayer, No eggs Non-conditioned 0 40 80 120 160 200 240 280 Time (min) 150 125 c E o> 100 75 50 25 B Nonlayer No eggs Non-cond. Egg layer No eggs Non-cond. Stimulus Figure 8. Aplysia brasiliana does not distinguish between recent egg layers and nonlayers in non-conditioned ASW without an egg cordon. (A) Recent egg layers and nonlayers mated at the same frequency in non-conditioned ASW without an egg cordon. The experimental protocol is shown in Figu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEXUAL PHEROMONES IN APLYSIA 89 100. Egg layer, No eggs Non-conditioned Nonlayer, No eggs Non-conditioned 0 40 80 120 160 200 240 280 Time (min) 150 125 c E o> 100 75 50 25 B Nonlayer No eggs Non-cond. Egg layer No eggs Non-cond. Stimulus Figure 8. Aplysia brasiliana does not distinguish between recent egg layers and nonlayers in non-conditioned ASW without an egg cordon. (A) Recent egg layers and nonlayers mated at the same frequency in non-conditioned ASW without an egg cordon. The experimental protocol is shown in Figure 6 (n = 20 experiments). (B) There is no difference in mean latency to mating between recent egg layers and nonlayers in non- conditioned ASW without an egg cordon. caged alone rather than in pairs (Blankenship et a!., 1983), the experiments were repeated with one animal in each beaker rather than two. Single-animal experiments: protocol. Four test animals, selected as described in the mating studies, were used in each experiment. One was placed in each of four beakers and egg-laying activity assessed at 10-min intervals for 270 min. The ASW in each beaker contained a different combination of animal-derived and cordon-derived fac- tors: (1) non-conditioned ASW without an egg cordon (negative control); (2) non-conditioned ASW with an egg cordon (cordon-derived factors only); (3) animal-condi- tioned ASW without an egg cordon (animal-derived fac- tors only); and (4) animal-conditioned ASW with an egg cordon (both animal-derived and cordon-derived factors). The conditions in each beaker were established as de- scribed in the section on mating (see Figs. 6 and 9). The volumes of the stimulus egg cordons were measured at the end of every experiment and averaged ml ( ± ml; mean ± ). In five experiments, all animals that were not induced to lay eggs were injected with atrial gland extract to verify that they were physiologically com- petent to do so; all laid egg
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