. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF SQUID MANTLE KINEMATICS 163 * -I on cd 5 J — — Hatchling Young 2. Time (sec) 01 :/ cs - >• T E o Z X 2 0 S - IA 1 S 09 '-J cs B 0 10 20 30 40 50 60 70 80 90 Dorsal Mantle Length (mm) Figure 8. Ontogenetic differences in the mass flux of the escape jet. l A) Calculation of the relative mass of water remaining in the mantle cavity versus the time course of the exhalant phase of one escape jet. The dashed line represents a hatchling stage squid ( mm dorsal m
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF SQUID MANTLE KINEMATICS 163 * -I on cd 5 J — — Hatchling Young 2. Time (sec) 01 :/ cs - >• T E o Z X 2 0 S - IA 1 S 09 '-J cs B 0 10 20 30 40 50 60 70 80 90 Dorsal Mantle Length (mm) Figure 8. Ontogenetic differences in the mass flux of the escape jet. l A) Calculation of the relative mass of water remaining in the mantle cavity versus the time course of the exhalant phase of one escape jet. The dashed line represents a hatchling stage squid ( mm dorsal mantle length) and the solid line a young 2 stage animal (65 mm dorsal mantle length). For each squid, the relative mass of water in the mantle cavity at intervals during the escape jet was calculated using morphometric and mantle kinematics data. See the Discussion for more details. The data for each animal were fitted with a polynomial equation. The equations are. }' = \HX- - + (r- = ) for the young 2 squid and )' = - + (r: = for the hatchling squid. The derivative of each equation yields the average mass flux during the escape jet. The average mass flux of the hatchling animal is approximately 2 times greater than that for the larger animal. Note that mass flux is highest early in the escape jet and diminishes at the end of the escape jet. (B) Calculation of the average mass flux of the escape jet versus dorsal mantle length. Each point represents the average mass flux of the exhalant phase of the escape jet normalized by the wet weight of the squid. Normalized average mass flux decreased significantly during ontogeny (Spearman rank order correlation coefficient. P < n = 55). See the Discussion for more details. a portion of the total jet thrust. Under steady-state condi- tions, the instantaneous thrust produced during a jet is proportional to the product of the instantaneous mass flux and the instantaneous
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
