TEMPERATURE CONTROLS ON CORALLINE ALGAL SKELETAL GROWTH1

Authors


  • 1

    Received 16 September 2008. Accepted 29 August 2009.

Abstract

Many marine and terrestrial organisms lay down regular growth bands. In some species (e.g., trees), control of growth band geometry is related to environmental conditions. Coralline algae are long-lived marine plants with a global distribution that lay down regular calcitic growth bands composed of more- and less-extensively calcified cells. Little is known about environmental and organism controls on their growth. In this investigation, coralline algae (Lithothamnion glaciale Kjellm.) were grown at 8, 11, and 15°C, and temperature controls on algal growth were considered. Calcite density within less-extensively calcified cells in L. glaciale was negatively correlated to summer temperature. No relationships were observed between temperature and calcite density in more-extensively calcified cells or growth-band width itself. Additionally, temperature controls on growth in three L. glaciale thalli over the last 50 years were considered. Temperature was negatively related to calcite density in more- and less-extensively calcified cells but showed no consistent relationship with band width.

Ancillary