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Time Lag in Population Growth Response of Isochrysis Galbana to a Variable Nitrate Environment
Author(s) -
Caperon John
Publication year - 1969
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1934845
Subject(s) - isochrysis galbana , chemostat , steady state (chemistry) , nitrate , population , population growth , lag , ecology , biology , chemistry , algae , bacteria , demography , computer network , genetics , sociology , computer science
Non—steady—state population growth equations are presented for Isochrysis galbana growing in a nitrate limited chemostat. It is necessary to introduce a more general response function in place of the customary time—lag parameter to describe the observed population growth. The model successfully predicts the population growth over two experiments, one of 56 and another of 80 days, under a variety of dynamic and steady—state growth conditions. The increasing instability at lower growth rates, shown by both the data and the growth equations, indicates that steady—state growth equations may not be adequate in at least some natural environments.