Nitrogen fixation in Northern Red Sea

Abstract EN

-Se\'en locations of different ewlogictl cO'1

Thl'se locations varied from a polilited area (SlIez Hay) to a dean one (coral rech ofSharm EISheikh) near southern pan of Sinai Peninsula.

Iligh activity of nitrogen fixation (up to I.X) f..!g I I h ') simult,llIeouslv with high counts of cvanohacteria werl' rl'cnrded in the dean coral red areas.

whik rl'm"rk"hk low "cti"itv and low cOllnts werc obsl'!'\'l'd in the polilltl'd Slil'/ fby.

Frici/(){II'.\'JIli/llll.

l.rllgh\'ll and Sl.iil'lllilll/ spp.

WL'rc the domin,lIlt specil's of cyano\)al'tcri, 1.

Did patterns of nitrogen fixation Wl're mL'asurcd in Sh,lrm I::I-Sheikh and in Sue/ Hay.

The measured dark fixati"n in cor,tI arL'," sllggests excretion of org'lnic carh"n required as energ\' sourCL' for thc ProCL'SS.

Nitrogen fixati"n rate in winter did IWI L'XtTl'd 1.'% "fSllTllmCr \',tlUL'S.

jlvtagnitlltk.

signifi"1I1Cl' ,111<1 fact"rs affecting nitrogen fixati"n ill differCili sites were discllssed.