4.3 Article

Dinitrogen fixation and primary productivity by carbonate and silicate reef sand communities of the Northern Red Sea

期刊

MARINE ECOLOGY PROGRESS SERIES
卷 527, 期 -, 页码 47-57

出版社

INTER-RESEARCH
DOI: 10.3354/meps11224

关键词

Carbonate sand; Silicate sand; Gulf of Aqaba; Microphytobenthos; Photosynthesis; Seasonality; Oxygen fluxes; Acetylene reduction

资金

  1. German Research Foundation (DFG) [Wi 2677/6-1]
  2. German Leibniz Association (WGL)
  3. Evangelisches Studienwerk Villigst e.V.

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Permeable sediments are highly bioactive compartments in coral reefs. The associated dense microbial communities sustain fast degradation of organic matter, thereby playing a key role in nutrient recycling within the reef. Besides nutrient recycling, new nutrients (i.e. nitrogen) are acquired by dinitrogen (N-2) fixing microbial communities, but knowledge about the influence of sand mineralogy and key environmental factors on this process is scarce. Therefore, this study quantified seasonal N-2 fixation (via acetylene reduction) along with gross photosyn thesis (via O-2 fluxes) by adjacent carbonate and silicate sands in a Northern Red Sea coral reef. Findings revealed significantly higher N-2 fixation in carbonate than in silicate sands (2.88 and 1.52 nmol C2H4 cm(-2) h(-1), respectively) and a more pronounced seasonal response in the former, likely caused by its higher permeability, grain size and microbial abundance. Ambient light and organic matter availability were the main controlling environmental factors for sand-associated N-2 fixation. Carbonate and silicate sands showed similar gross photosynthesis rates (270 and 233 nmol O-2 cm(-2) h(-1)) that positively (carbonate sands) or negatively (silicate sands) correlated with N-2 fixation, likely due to different diazotrophic communities. Seasonal appearance of microbial mats on carbonate sands increased N-2 fixation and gross photosynthesis by up to one order of mag nitude. On an annual average, carbonate and silicate sands obtain similar to 8% and microbial mat communities obtain similar to 13% of their photo-metabolic N demand via N-2 fixation.

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