MEPS 322:61-73 (2006)  -  doi:10.3354/meps322061

ABSTRACT: The use of pulse-amplitude modulated (PAM) fluorometry in situ and in vivo as an indicator for nutrient and light status of microphytobenthos communities was investigated on the Great Barrier Reef. The 10 reefs investigated were located along a previously described water quality gradient, confirmed by sediment chemistry parameters (C_org, N) and incident light measurements. Estimates of the efficiency of Photosystem II (PSII) were biased when not corrected for background fluorescence that increased with increasing inorganic C content of the sediments. Uncorrected values mimicked a decline in quantum efficiency towards areas with presumed lower nutrient levels. Upon correction, maximum and effective quantum efficiency (ca. 0.59) did not vary significantly along the gradient. The maximum quantum efficiency (F_v/F_m,corr) measured after dark-adaptation did not differ statistically from effective quantum efficiency in the field (φ_PSII,corr). F₀ values measured in the laboratory were much lower than in situ F readings, indicating a higher concentration of biomass on the surface of the sediment in the field. Rapid light curve parameters (initial slope α, relative electron transport rate at light saturation rETR_max, irradiance at onset of light saturation E_k) were lower during in vitro readings than in situ. rETR_max and α values exhibited no statistical differences along the gradient. In contrast, E_k increased towards midshelf reefs and correlated with incident PAR, indicating that microphytobenthos communities were highly adapted to incident light conditions. Because coral reef microphytobenthos was previously shown to be nitrogen limited, it was unexpected that efficiency measurements would not vary. It is hypothesised that, due to potential for differential vertical migration, the actual species involved in photosynthesis at a given time are nutrient sufficient. Higher nutrient supply may change the community composition on the surface to dominance by species with higher productivity.

KEY WORDS: PAM · WQ gradient · Benthic microalgae (BMA) · Nutrient limitation · Light limitation