. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERSEGMENTAL FLEXIBILITY OF OPHIUROID ARMS 83 The metric of interest is #mjx, because we wish to know whether different ophiuroid species are differently lim- ited in their ability to flex between segments. Measure- ment error was determined by repetitive digitizing and was estimated to be ±2° (n = 900, SD = °). Results Results from this photographic survey allow interspe- cific comparisons of lateral flexibility between ophiuroid arm segments. These data do not address other plausible planes of rotation, such as oral-a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERSEGMENTAL FLEXIBILITY OF OPHIUROID ARMS 83 The metric of interest is #mjx, because we wish to know whether different ophiuroid species are differently lim- ited in their ability to flex between segments. Measure- ment error was determined by repetitive digitizing and was estimated to be ±2° (n = 900, SD = °). Results Results from this photographic survey allow interspe- cific comparisons of lateral flexibility between ophiuroid arm segments. These data do not address other plausible planes of rotation, such as oral-aboral flexibility or tor- sion. Figure 6 compares maximum intersegmental an- gles pooled separately from all of the locomotion and coiling experiments. The largest intersegmental rota- tions were observed during coiling trials (Fig. 6B), where both the minimum and the maximum observations ex- ceed those seen in unrestrained locomotion. This sug- gests that the direct illumination and limited refuge size used to elicit coiling prompts an increase in joint flexion. Because the observed rotations depend on the experi- mental conditions, data from the locomotion and coiling trials were analyzed separately. Locontotinn trials Six species provided sufficient data for analysis of flexion during locomotion. Individuals within species showed similar means and variances for intersegmental angles, so all measurements from conspecifics were 45 n Opt ii( iderma appressum Upluoderma cinereitm 40- n = 246 J - n = 176 35 - l- -. - 30- 1 \ - 25 - -\ - 20- / 1'1 \ - i -'"Tl_\ 15 1 j 1\ T y - 10 2 - ri M^ 5 0 ^\ _^ ... J^ "ht- vZi- \ • I i • i 0 4 8 12 16 20 24 0 4 8 12 16 20 24 4<; Ophiocoma echinata Ophiothrix oerstedii 40- n= 126 - n = 89 35 - - 30- - 25 - - 20- I 15 - 1 &ifc\ 10- 1 ? 4 * Jr ;i^i 5 - J Jrtf jf' "'T ff Tfsh 0 - 1 JJSL .-. I,.. .l.» — ' 1 — "^ 0 4 8 12 16 20 24 0 4 8 12 16 20 24 45 -. Ophionereis reticulata 40- n = 60 35 - 30- H a 2
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
