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Photorespirometry has long been used to examine primary production of aquatic micro- and macroalgae. Despite a growing number of studies examining in situ primary production in soft sediment ecosystems, little has been done to test in situ primary production on rocky reefs. This dis- parity may be due, in part, to a lack of a suitable photorespirometry apparatus able to be sealed to rocky reef surfaces. To compare laboratory and field-based primary production we designed and tested a photorespirometer. Because the device fits securely to rocky reefs, we were able to test nat- ural assemblages and monospecific stands during immersion in situ. These were then compared to similar algal assemblages in laboratory conditions over irradiance levels from 100 to 2000 µmol m -2 s -1 . Primary productivity of both canopy-forming fucoid algae and understory corallines was greater in situ than under lab conditions, particularly at irradiance levels above 1500 µmol m -2 s -1 . Compar- isons between laboratory and in situ conditions suggest fundamental differences in dynamics of pro- ductivity and point to a vital role of light delivery. Furthermore, the increasing productivity down a shore-height gradient shows that a combination of greater biomass and greater numbers of macro- algal species significantly increases primary productivity of these macroalgal assemblages.

Primary productivity of intertidal macroalgal assemblages: comparison of laboratory and in situ photorespirometry