. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRUSTACEAN ESCAPE BEHAVIOR 313 Table 3 Ttiilfun anil abdominal dimensions for Homarus americanus and Cherax destructor Species Stage Tailfan width in mm Abdomen length in mm (mean ± SD) (mean ± SD) H. tinicru tintis I 13 2 .24 ± ± f).2S H. americanus 11 13 2 .36 ± ± H. americanus 111 5 2 .48 ± 0. 33 ± H. IV 7 3 .85 ± 0. 35 ± C. tli'slnictor ADI 9 2 .83 ± 0 19 ± Tailfan widths for H. americain/s stages III and IV and C. destructor ADI include uropods and se
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRUSTACEAN ESCAPE BEHAVIOR 313 Table 3 Ttiilfun anil abdominal dimensions for Homarus americanus and Cherax destructor Species Stage Tailfan width in mm Abdomen length in mm (mean ± SD) (mean ± SD) H. tinicru tintis I 13 2 .24 ± ± f).2S H. americanus 11 13 2 .36 ± ± H. americanus 111 5 2 .48 ± 0. 33 ± H. IV 7 3 .85 ± 0. 35 ± C. tli'slnictor ADI 9 2 .83 ± 0 19 ± Tailfan widths for H. americain/s stages III and IV and C. destructor ADI include uropods and setae, and abdominal lengths were taken from the tip of the telson (including the setae for stages III and IV H americanus and ADI C. destructor) to the anterior edge of the first abdominal segment. dence of the MG fiber in all three stages. No large-diameter axon was detected in the lateral region where the LG fiber is found in the adult (Fig. 6A): more than ten thousand sections were examined, from 6 stage I animals. 5 stage II animals, 6 stage III animals, and 3 stage IV animals. Un- fortunately, the sections of stage IV H. iiiucricanus were not of a high enough quality to draw any conclusions. Both MG and LG fibers were clearly present in most of the sections taken from the same region in ADI C. destructor (Fig. 6B). Hiihiniution of tailflick responses To investigate the habituation of the tailflick escape re- sponse in larval and postlarval H. americanus and juvenile C. destructor, we presented animals with a water jet stim- ulus at 1-min intervals and counted the number of tailflicks in response to each stimulus. Fricke (1984) also successfully employed a water jet stimulus to measure the rate of habit- uation in another species of crayfish. Procanibarus clarkii. Although many other researchers use tactile stimuli to elicit tailflicks in crayfish (Krasne and Woodsmall. 1969; Wine and Krasne, 1969: Wine er al, 1975). Wine and Krasne (1972) emphasize that the sudd
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