Benthic nitrogen fixation in the SW New Caledonia lagoon

Aquatic Microbial Ecology

Romain Alliod Martine Rodier Stjepko Golubic¹  Loïc Charpy¹ 

关键词: Nodularia;    Hydrocoleum;    Microbial mats;    Nitrogen fixation;    Coral;    Reef lagoon;   

DOI  :  10.3354/ame047073

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Various types of microbial mats are widespread in the SW New Caledonia lagoon. Both heterocystous (Nodularia harveyana) and non-heterocystous (Hydrocoleum cantharidosmum, H. lyngbyaceum) cyanobacteria dominate these mats. Using the acetylene reduction technique, nitrogenase activity was observed at all sites. Heterocystous cyanobacteria fix N₂ during the daytime, whereas non-heterocystous cyanobacteria fix N₂ during the night. The intensity of nitrogenase activity depended on the level of light energy received during daylight. An estimation of nitrogen fixation by benthic cyanobacteria (16.4 ± 5.4 mg N₂ m^–2 d^–1) at 21 m depth (average depth of the lagoon) represented 19% of the nitrogen requirement for benthic primary production.

【 授权许可】

Unknown