. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COMPONENTS OF FEEDING BEHAVIOR IN HYDRA 115 In turn, the writhing activity becomes less vigorous, and concerts return at en- hanced frequencies. Concert frequencies are gradually restored to base line levels, 30-60 minutes later. Both concerted oral flexion and tentacle writhing can be chemically induced, by either Arteinia extract or GSH (Fig. 2 and 4). On exposure to Artemia extract CO 25 Q O CC. 20 LJ Q_ Z 15 in 10 L. O 5. 5 10 15 20 NUMBER OF CONCERTS/15 MIN. B. 40 O cr LJ Q. CO o LLI CO O OJ \ CO i cr. LjJ U- o UJ O cr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COMPONENTS OF FEEDING BEHAVIOR IN HYDRA 115 In turn, the writhing activity becomes less vigorous, and concerts return at en- hanced frequencies. Concert frequencies are gradually restored to base line levels, 30-60 minutes later. Both concerted oral flexion and tentacle writhing can be chemically induced, by either Arteinia extract or GSH (Fig. 2 and 4). On exposure to Artemia extract CO 25 Q O CC. 20 LJ Q_ Z 15 in 10 L. O 5. 5 10 15 20 NUMBER OF CONCERTS/15 MIN. B. 40 O cr LJ Q. CO o LLI CO O OJ \ CO i cr. LjJ U- o UJ O cr LjJ a. 100 200 300 400 500 INTER-CONCERT INTERVAL LENGTH (SECS.) FIGTRE 3. Concert frequency in H. littomlis; A: per cent distribution of concerts/15 min periods for 60 hydra ; B : inter-concert interval distribution for 60 hydra. there are a few initial concerted tentacle flexions, followed by considerable tentacle writhing. Such writhing is the predominant tentacle activity in the first 15 minute period following exposure to the homogenate. Thus, the concert frequency is only slightly above the pre-stimulation level during this period. However, for the subsequent 45 minutes, concert frequency is greatly enhanced, and is still above control values an hour after administration of the extract. This behavioral se-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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