Effect of temperature on diatom volume, growth rate, and carbon and nitrogen content: Reconsidering some paradigms

This source preferred by Daniel Franklin

Authors: Montagnes, D.J.S. and Franklin, D.J.

Journal: Limnology and Oceanography

Volume: 46

Pages: 2008-2018

ISSN: 0024-3590

We examined the response of diatoms to naturally experienced temperatures and tested these hypotheses: (1) diatoms follow the rule that organism size decreases with increasing temperature; (2) diatom growth rate follows a Q1O-like response; (3) diatom carbon (C) and nitrogen (N) content per unit volume (V) decrease with increasing size, and changes in temperature affect this relationship; and (4) diatom C: V is the same as that of other phyto- plankton. We also present, as predictive equations, relationships between (1) growth rate, temperature, and size; (2) C content and V; and (3) N content and V. Eight diatoms and two flagellates were acclimated for approximately five generations and grown for approximately five more generations at five temperatures (9-25°C) on a 14: 10 light: dark cycle at 50 ,umol photons m-2 s-l. Growth rate, cell V, and C and N content per cell were measured; relationships between these parameters and temperature were determined. For five diatoms and both flagellates, cell V decreased with increasing temperature; cells decrease by 4% of their mean V per °C. Growth rate appeared to increase linearly with temperature in all cases. The literature suggests that a linear response is the rule, not the exception. Temperature did not significantly affect C or N per V of diatom species. When all diatoms were con- sidered, both C and N per V decreased with increasing cell size; our data support the argument that diatoms differ from other protists in this respect, but the difference is less pronounced than stated in previous reports.

The data on this page was last updated at 05:17 on May 25, 2020.