. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEXUAL PHEROMONES IN APLYSIA 91 100 * 80 OB c 60 ra CL 40 20. Nonlayer, Eggs Non-conditioned Nonlayer, No eggs Non-conditioned 0 40 80 120 160 200 240 280 Time (min) 200 150 100 50 Nonlayer No eggs Non-cond. Nonlayer Eggs Non-cond. Stimulus Figure 10. High concentrations of animal-denved factors are not required for the induction of mating activity by recently deposited egg cordons. (A) A higher percentage of nonlaying .•l/Vrau brasiliana mated at early time periods when an egg cordon was placed in the surrounding non-condit
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEXUAL PHEROMONES IN APLYSIA 91 100 * 80 OB c 60 ra CL 40 20. Nonlayer, Eggs Non-conditioned Nonlayer, No eggs Non-conditioned 0 40 80 120 160 200 240 280 Time (min) 200 150 100 50 Nonlayer No eggs Non-cond. Nonlayer Eggs Non-cond. Stimulus Figure 10. High concentrations of animal-denved factors are not required for the induction of mating activity by recently deposited egg cordons. (A) A higher percentage of nonlaying .•l/Vrau brasiliana mated at early time periods when an egg cordon was placed in the surrounding non-conditioned ASW; the increase was statistically significant at 20, 30,40. 70, and 100-140 min [X2(l)> in each case; P < ]. The experimental protocol is shown in Figure 9 (n = 15 experiments). (B) Placing an egg cordon in the non-conditioned ASW surrounding two nonlaying animals significantly reduced their latency to mating relative to nonlaying animals without an egg cordon (P < ; one-way analysis of variance). The experimental protocol is shown in Figure 9 (n = 15 expenmentsl. chains of A. californica, for example, are both more stable and more attractive when the first animal in the chain is laying eggs (Audesirk, 1977). The present studies have shown that both egg-layer- derived and cordon-derived factors contribute to the at- tractiveness of an egg-laying animal. Although there are two apparent sources of this pheromonal activity, it re- mains to be demonstrated whether the two sets of factors differ biochemically. There is extensive and prolonged contact between the egg layer and its cordon, both during and following oviposition, which would facilitate a transfer of activity between the two. The attractiveness of a nonlaying animal was increased by placing a recently deposited egg cordon in the same arm of the T-maze, providing the basis for a simple bioas- say system in which to identify potential tissue sources of the "cordon-derived" pheromon
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
