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C a rbon fluxes from a m angrove c reek with ad jacen t seag rass m ead o w s an d coral reefs (at 4 km from the creek) w e re inves tiga ted in Gazi Bay (Kenya). Analysis of the s table isotope s ig n a tu re of sed im en t carbon in the seag rass zone and da ta on the sed im en t carbon conten t indicate tha t outwelling of par ticu la te organic m at te r (POM) from the m angrove forest occurs, but that deposition of this POM rapidly dec reases aw ay from the forest. No ev idence for any inpu t of m an g ro v e POM in the seagrass zone w as found at a d is tance of 3 km from the m an g ro v e creek, n e a r the reefs. T he g rad ien t in sed i ­ m en t 813C va lues in the seagrass zone was paral le led by a similar g rad ien t of 813C va lues in Thalasso­ dendron cilia tum , the d om inan t subtidal seagrass . This g rad ien t p robab ly reflects the availabili ty of respiratory C 0 2 der ived from m ang ro v e POM as a carbon source for the seagrass . Analysis of C :N ratios of par ticu la te m ateria l (< 1 mm) collected with sed im en t traps in the seagrass zone y ie lded va lues rang ing from 8.5 to 11.2. This ran g e is rem arkab ly low com p ared to C :N ratios of p lan t m ateria l p ro ­ d u ced in the m ang ro v e forest, a n d suggests that some of the m an g ro v e -d er iv ed organ ic particles deposi ted in the seag rass zone have gone th rough a ph ase of in tensive processing. During flood tides conspicuous decreases w e re found in 813C values of seston f lowing over the seagrass zone, coinciding with significant increases in the carbon content of the seston. T hese f indings point to a reversed flux of o rganic particles from the seagrass zone to the m an g ro v e forest. O ur da ta indica te that, as far as POM fluxes a re concerned , the m angrove forest and ad jacen t seagrass m ead o w s a re tightly coupled, but that the n earby coral reefs m ay exist in relative isolation.

Carbon outwelling from a mangrove forest with adjacent seagrass beds and coral reefs (Gazi Bay, Kenya)