. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMICAL ATTRACTION OF OYSTER DRILLS 499 CO c O Q. (V o: 90 - 70 - 50 - 30 - 10. log Stimulus Concentration FIGURE 4. The response of newly hatched snails to a dilution series of Balanus eburneus stimulus water. Seven grams wet weight of barnacles (11 individuals) were placed in 850 ml of 1 nm filtered sea water and allowed to incubate for two hours. Subsequently the activity response of recently hatched snails was tested over a range of concentrations of stimulus water diluted with 1 ^m filtered sea water. Full strength sti
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMICAL ATTRACTION OF OYSTER DRILLS 499 CO c O Q. (V o: 90 - 70 - 50 - 30 - 10. log Stimulus Concentration FIGURE 4. The response of newly hatched snails to a dilution series of Balanus eburneus stimulus water. Seven grams wet weight of barnacles (11 individuals) were placed in 850 ml of 1 nm filtered sea water and allowed to incubate for two hours. Subsequently the activity response of recently hatched snails was tested over a range of concentrations of stimulus water diluted with 1 ^m filtered sea water. Full strength stimulus was considered as having a value of 1. Assay criterion was the same as that described in Figure 2. Flow discharges were ml/min. Point represented by * was actually generated by assay of water with background stimulus activity. d. Individual species stimulus: filter feeders The first experiments on stimulus water of individual species suggested that not all potential prey of Urosalpinx cinerea release attractants that elicit responses from newly hatched snails. Accordingly, we next tested several additional filter feeding organisms. Only water from Trypetesa lampas was marginally active, eliciting a low (15%) but significant (P < ) response from the drills (Fig. 3). Water from the six additional species did not stimulate the newly hatched predators to creep up- current. e. Individual species stimulus experiments: other organisms Of the 8 potential sources tested, only mixed bryozoans and tube worms pro- duced attractants. Waters from mixed bryozoans stimulated up to a 70% response and were active when diluted tenfold. A stimulus associated with tube worms was active only when diluted 10-fold, and evoked a greater than 30% response. No obvious negative responses were made by snails to water from any of the potential predators and no other positive responses were observed. In summary, screening experiments showed high percentage responses of newly hatched snails
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
