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A Contribution on the Age‐structure of Branchiostoma lanceolatum
Author(s) -
Sager Günther,
Gosselck Fritz
Publication year - 1985
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19850700413
Subject(s) - mathematics , function (biology) , regression , point (geometry) , statistics , nonlinear system , econometrics , biology , evolutionary biology , physics , geometry , quantum mechanics
Former investigations into the age structure of Branchiostoma lanceolatum by Courtney (1975) and Gosselck and Spittler (1979) centered on the assumption that the relative length growth of this species diminishes logarithmically with increasing age. Regarded from a mathematical point of view, this relation demands an exactly channelled form of growth, and this can be checked by submitting the basic values to nonlinear regression. As the results of this procedure yield considerable deviations from the measured data, the function of length growth given by Pütter and v. Bertalanffy is applied and reduces the error by about 70 %. As a consequence the former assumption must be corrected.