. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 5 Position (mm). 100 Time (ms) Figure 2. Displacement trajectories in the vertical plane plotted from a common starting point for escape responses to rapid decreases in light intensity of adult female specimens of Acurtia IHIIMI (A). Distance from original position plotted against time (B). tion intensities of /nmol photons m 2 s ' and higher resulted in a response by about 80% of the copepods (Fig. 3A). For an adaptation intensity of jLunol photons m "' s \ the response rate dropped rapidly to less than 10%.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 5 Position (mm). 100 Time (ms) Figure 2. Displacement trajectories in the vertical plane plotted from a common starting point for escape responses to rapid decreases in light intensity of adult female specimens of Acurtia IHIIMI (A). Distance from original position plotted against time (B). tion intensities of /nmol photons m 2 s ' and higher resulted in a response by about 80% of the copepods (Fig. 3A). For an adaptation intensity of jLunol photons m "' s \ the response rate dropped rapidly to less than 10%. For adult females of A. tonxa the change in response rate with light adaptation intensity changed more gradually (Fig. 3B). At both 10 and 100 /umol photons m"2 s ', response rate was similar to that of males at the same intensity, about 80%. However, the response rate dropped to about 60%- at ju,mol photons rrT2 s" ' and to less than 50% at /imol photons m~2 s '. None of the females responded at an adaptation intensity of /umol photons m~2 s '. There- fore, the threshold light intensity for stimulating escape responses with complete shadows is between and jumol photons m 2 s ' for both adult males and females of A. tonsu. For complete reduction in light intensity, the response latency between the initiation of the change in light intensity and the initiation of the first escape movement increases as the light adaptation intensity decreases (Fig. 3). For adult males, the mean response latencies progressively changed from 38 ms at 100 /xmol photons m 2 S ' to 90 ms at /Limol photons m 2: s~'. A Kruskal-Wallis one-way ANOVA on ranks indicated a significant difference in re- sponse latencies at different adaptation intensities (P < ). Dunn's method for pairwise comparisons revealed that all pairs of groups were significantly different from one another (P < ). For adult females, the mean response latencies changed from 33 ms at 100
Size: 1929px × 1295px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
