Oxygen evolution in a hypersaline crust: in situ photosynthesis quantification by microelectrode profiling and use of planar optode spots in incubation chambers

Aquatic Microbial Ecology

Ketil Sørensen¹  Jana Woelfel¹  Mareike Warkentin¹  Rhena Schumann¹  Aharon Oren¹  Stefan Forster¹ 

关键词: Hypersaline;    Gypsum crust;    Microbial mat;    Net production and respiration;    Microelectrode;    Optode;   

DOI  :  10.3354/ame01326

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Net primary production and respiration were estimated in a hypersaline cyanobacterial mat colonizing a gypsum crust in the Eilat salterns, Israel. Two different approaches were used: in situ microprofiling with Clark-type O₂ sensors and application of optode sensor spots in incubation chambers. The net O₂ release rates of the mat phototrophs was high, with a maximum of 3.4 nmol O₂ cm^–2 min^–1 measured by microprofiling and 4.4 nmol O₂ cm^–2 min^–1 determined in the incubation chambers. The upper 2 layers of the mat as well as the overlying water quickly became O₂ saturated during the day. The respiration of the whole gypsum crust was also very intensive and corresponded to the O₂ produced by photosynthesis on a diurnal basis, which prevented most of the evolved O₂ from reaching the water. The results presented show that optode sensor spots are useful tools providing additional information about export and photosynthetic production rates of O₂ in hypersaline microbial mats.

【 授权许可】

Unknown