. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 000 025 050 075 100 125 150 175 200 0 00 0 25 0 50 0 75 1 00 125 1 50 175 2 00 Time (s) 120 100 80 60 40 20 0 -20 -40 -60 -80 100. 000 025 050 075 1 00 1 25 1 50 1 75 2 00 0 00 0 25 0 50 0 75 1 00 1 50 1 75 2 00 Time (s) Figure 1. Electromyograms recorded from electrodes embedded in both peripheral aerobic circular muscle and central anaerobic circular muscle of a brief squid ( cm dorsal mantle length) while swimming at 6, 15, and 24 cm s" '. Mantle diameter and acceleration are plotted underneath each recording
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 000 025 050 075 100 125 150 175 200 0 00 0 25 0 50 0 75 1 00 125 1 50 175 2 00 Time (s) 120 100 80 60 40 20 0 -20 -40 -60 -80 100. 000 025 050 075 1 00 1 25 1 50 1 75 2 00 0 00 0 25 0 50 0 75 1 00 1 50 1 75 2 00 Time (s) Figure 1. Electromyograms recorded from electrodes embedded in both peripheral aerobic circular muscle and central anaerobic circular muscle of a brief squid ( cm dorsal mantle length) while swimming at 6, 15, and 24 cm s" '. Mantle diameter and acceleration are plotted underneath each recording. Electrical activity occurs during each mantle contraction, and at high speeds electrical activity is sometimes present during mantle expansion. burst swimming in fishes (Rome el al., 1984; Jayne and Lauder, 1996) and escape jets in cephalopods (Bone et al., 1981. 1994; Mommsen et 1981). Finke et al. (1996) determined that anaerobic end products, such as a-glycero- phosphate. succinate. and octopine. begin to accumulate in Lolliguncula brevis at speeds of mantle lengths s~' ( cm s"' for a specimen of DML), suggest- ing that anaerobic metabolism may occur in the mantle at low intermediate speeds. Moreover, intramantle pressure records revealed that at speeds of mantle lengths s~' ( cm s~' for a specimen of DML) high mantle pressures comparable to those recorded at speeds of mantle lengths s~' ( cm s~' for a specimen of DML) are periodically generated (Finke et al., 1996). Ac- cumulation of anaerobic end products and the occasional detection of high intramantle pressures at intermediate speeds are consistent with the activity of anaerobic circular muscle observed at intermediate speeds in this study. Peri- odic anaerobic circular mantle activity at intermediate speeds boosted power production, which helped squid keep pace with free-stream flow in the tunnels. Periodic anaero- bic activity was probably not energetical
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
