Age populations and biometrics in eelgrass, Zostera marina L.

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Abstract
Differences in turion and leaf size of eelgrass, Zostera marina L., were examined in 26 populations in the Limfjord, Denmark. The number of flowering turions reached a peak in late June with 24.4 % of turions being reproductive. The sheath constituted about 25 % of the total turion length. The sheath/turion ratio was independent of rurion size. Turion length and leaf width inside individual beds were highly correlated (r = 0.94). Within individual plants whose rhizomes carry 2 or more turions, turion size varies and turion length is correlated with leaf width (r = 0.96). Grouping the turions into size groups indicated the existence of age classes, and it was possible to separate 5 distinct age groups.