. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. R. M. CERRATO ET AL. Sp (f ) 400 j_JiJiAisiO,N,D,J,F,M1A,M,J 2. 0 100 200 300 400 Day Number Figure 1. Microgrowth patterns in the chondrophore of Mya arenaria. (u) I lew of left valve with associated chondrophore. Line A-B shows orientation oj thin sections, (b). (c), and (e) Optical micrographs oj thin sections illustrating the detailed microgrowth increment patterns. Note the seasonal variations in increment thickness and morphology. All three micrographs to same scale, (d) Composite optical micrograph of a thin section o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. R. M. CERRATO ET AL. Sp (f ) 400 j_JiJiAisiO,N,D,J,F,M1A,M,J 2. 0 100 200 300 400 Day Number Figure 1. Microgrowth patterns in the chondrophore of Mya arenaria. (u) I lew of left valve with associated chondrophore. Line A-B shows orientation oj thin sections, (b). (c), and (e) Optical micrographs oj thin sections illustrating the detailed microgrowth increment patterns. Note the seasonal variations in increment thickness and morphology. All three micrographs to same scale, (d) Composite optical micrograph of a thin section oj the chondrophore and hinge region of a 4+ year old individual. Distinct summer (S) and spawning features (R) are evident. Spring (Sp) and fall/winter (F/\\') appear as dark (opaque) regions in thin sections. Specimen collected in March 1989. [/) Counts of the number of microgrowth increment pairs occurring after the spawning band versus day number during 1988-89 (n = 46). Based on monthly sampling, the spawning band was produced in individuals after 13 May and prior to 8 June, the first date plotted in the figure. For the regression. 1 June is defined as the origin. The segmented or two-phase linear function was fit by least squares under the assumptions that the location of the join point was unknown and error variances in the two segments were unequal. Detailed methods lor this regression may he found in Hudson (30). Slope oj the lirst line segment verifies the semidiurnal rate of increment deposition (95% CI: < b, < pairs of increments per day). Rale oj increment production decreases in fall/winter us shown by the slope of the second line segment (95% CI: < b: < pairs of increments per day). the chondrophore edge (Fig. la). Specimens were then mounted onto petrographic slides, sectioned a second time, ground, and polished by hand. Thin sections of 231 specimens were examined under transmitted light using a compound microscope at low magnific
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
