Open Access

Table 2

Characteristics of the biorhythms of the relative linear growth rate in M. margaritifera.

Specimen No. m1 P1, years m2 P2 (years) No. specimen m1 P1 (years) m2 P2 (years)
1 3 8.0 7 4.3 ± 0.3 14 6 7.6 ± 0.7 13 3.7 ± 0.3
2 6 6.8 ± 1.0 12 4.0 ± 0.3 15 5 8.5 ± 1.3 10 4.4 ± 0.4
3 4 7.3 ± 1.8 9 4.0 ± 0.9 16 8 4.9 ± 0.4 10 4.4 ± 0.6
4 6 7.6 ± 1.5 11 4.2 ± 0.4 17 8 5.4 ± 1.8 12 3.5 ± 0.3
5 5 8.0 ± 2.0 8 4.3 ± 0.3 18 5 8.0 ± 1.8 9 4.3 ± 0.3
6 8 7.4 ± 1.4 13 4.2 ± 0.3 19 6 6.4 ± 2.6 9 4.8 ± 0.4
7 8 7.7 ± 1.3 11 4.8 ± 0.4 20 7 6.3 ± 1.3 11 4.4 ± 0.4
8 5 7.5 ± 2.9 8 4.0 ± 0.4 21 11 4.8 ± 0.4 16 3.6 ± 0.3
9 8 8.0 ± 0.6 15 4.0 ± 0.3 22 7 6.0 ± 0.5 12 3.6 ± 0.2
10 4 7.3 ± 2.7 10 4.0 ± 0.3 23 5 7.0 ± 0.6 10 3.6 ± 0.3
11 10 5.3 ± 0.7 14 3.5 ± 0.2 24 5 7.0 ± 1.7 10 4.0 ± 0.5
12 5 8.5 ± 1.5 9 4.5 ± 0.5 25 6 4.8 ± 1.0 8 3.7 ± 0.3
13 4 10.0 ± 1.2 10 4.0 26 3 10.0 5 4.5 ± 1.3

m is the number of local extreme points, P is the biorhythm period, index 1 is the low-frequency biorhythm, and index 2 is the high-frequency biorhythm. Data are given for the shells with at least 15 measured annual growth rings.

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