Open Access

Table 3

A comparison of growth parameters in different M. margaritifera populations (results on populations from the Syskyanjoki River, the Nemina River and the Varzuga River presented in Zotin and Ieshko (2018)).

River
(latitude)
a k (per year) P1 (years) P2 (years)
Syskyanjoki
(61.7° N)
0.114 ± 0.003
(n = 88)
0.121 3.9 ± 0.1
(n = 87)
Nemina
(62.8° N)
0.064 ± 0.005
(n = 23)
0.066 5.1 ± 0.1
(n = 13)
3.9 ± 0.1
(n = 20)
Livojoki
(64.8° N)
0.060 ± 0.006
(n = 32)
0.062 7.2 ± 0.3
(n = 26)
4.1 ± 0.1
(n = 26)
Varzuga
(66.7° N)
0.048 ± 0.001
(n = 90)
0.049 6.5 ± 0.1
(n = 68)
4.1 ± 0.1
(n = 68)

a is the growth deceleration coefficient in equation (1), k is the growth constant, n is the number of specimens, P1 is the period of low-frequency biorhythms, P2 is the period of high-frequency biorhythms, and “–” is the no biorhythm detected.

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