Increases in seagrass cover are paralleled by decreases in benthic slope along DGPS-and depth tracked video monitoring transacts in the a Central Adriatic embayment (CROSBI ID 586650)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Mokos, Melita ; Kruschel, Claudia, Schultz ; Stewart Tyre
engleski
Increases in seagrass cover are paralleled by decreases in benthic slope along DGPS-and depth tracked video monitoring transacts in the a Central Adriatic embayment
Shallow and enclosed bays are prone to experience sedimentation resulting in decreases in slope and overall depth. Seagrass beds are known to foster sedimentation which then either (i) benefits seagrass growth, as the bed expands onto new raised and sufficiently illuminated ground or (ii) hampers it, as fast sedimentation may burry newly growing shoots or interfere with seed germination. The shallow benthos of the westernmost Novigrad Sea, an enclosed bay in the Central Croatian Adriatic, has been monitored by means of videographed, DGPS and depth tracked transects positioned perpendicular to the shore and spanning depths from 0 to maximal 6 m, which is larger then 5.2 m, the maximum depth limit for seagrass in the area. Transects were repeatedly followed and videographed with sub-meter accuracy and subsequent video analyses identified each second (approximately 0.3 transect meters) as either seagrass, rock, algae, or unconsolidated sediment. From June 2007 to June 2008 almost all transects decreased in benthic slope and simultaneously experienced an overall gain in seagrass coverage averaging 40 linear transect meters and equaling an average yearly gain of 22% per transect. We identified most of the seagrass gain as a transition from unconsolidated sediment at various depths but mostly at the deep ends of transects where new shallow ground allowed for additional seagrass growth. Future research will include the continuation of the video monitoring as well as methods to estimate sedimentation rates, and experiments to identify interactions between seagrass growth and sedimentation events.
seagrass; sedimentation; monitoring; GPS; videography; Adriatic
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Podaci o prilogu
2009.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of the Mediterranean Seagrass Workshop ’09
Di Carlo, G., Calladine, A., Žuljević, A.
Hvar: Seagrass 2000 - Mediterranean Seagrass Association
Podaci o skupu
Mediterranean Seagrass Workshop ’ 09
predavanje
06.09.2009-10.09.2009
Hvar, Hrvatska