. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B 100 50 100 150 TIME(MIN) 200 250 QUINPIROLE. 100 150 TIME(MIN) 200 250 Figure 2. Percentage of larvae ofBugitla ncrilina that were pholo- • after timed exposure to varying concentrations of (A) dopa- and (B) quinpirole. Each point represents the mean (±1 SEM) of ic trials. I •, i .nation of symbols as in Figure 1. •of larvae of B. neritina at concentrations of 10 5 to ;. but was clearly toxic to the larvae. The D: DA >r agonist quinpirole, however, mimicked the effect o )\ in prolonging positive phototaxis. The per- cen
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B 100 50 100 150 TIME(MIN) 200 250 QUINPIROLE. 100 150 TIME(MIN) 200 250 Figure 2. Percentage of larvae ofBugitla ncrilina that were pholo- • after timed exposure to varying concentrations of (A) dopa- and (B) quinpirole. Each point represents the mean (±1 SEM) of ic trials. I •, i .nation of symbols as in Figure 1. •of larvae of B. neritina at concentrations of 10 5 to ;. but was clearly toxic to the larvae. The D: DA >r agonist quinpirole, however, mimicked the effect o )\ in prolonging positive phototaxis. The per- centage of photopositive larvae was significantly greater after 240 min in quinpirole treatments of 10~5 and 10^6 M than in the untreated controls (P< , Fig. 2B). Application of quinpirole at 10~7 and 10~s M produced an initial decrease in the percentage of photopositive lar- vae compared with the controls, but the difference was no longer significant after 240 min. Localization of serotonin Larvae of B. neritina have two pigmented eyespots sit- uated in two depressions on the posterior lateral surface of the larva (Fig. 3). The lateral surfaces of the larva are formed by heavily ciliated cells of the corona, the larval locomotory organ. An apical disc complex with a central neural plate is situated at the aboral pole of the larva. Immunolocalization of 5HT was achieved in larvae of B neritina, but the procedure resulted in distortion of larvae and made precise determination of sites of the re- action difficult (Fig. 4). Strong 5HT-like immunoreactiv- ity is evident, however, in the region of the equatorial nerve-muscle ring and in two tracts extending from the apical disc to this ring. These tracts are in a position oc- cupied by a nerve-muscle tract extending from the roof of the metasomal sac and equatorial nerve-muscle ring to the neural plate in the center of the apical disc. The equatorial nerve-muscle ring underlies the two posterior lateral pigmented eyespots
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
