Projects per year
Methods: We tested the effects of sedimentary OM additions on Posidonia australis seedlings growing in tank cultures. We focussed on sediment biogeochemical processes and microbial communities that may impact seedling growth and physiology. Results: Enrichment of sediments with OM changed microbial community composition (DNA-ARISA) and a significant increase in hydrolytic enzyme expression. Total seedling biomass did not differ between OM treatments, but above:belowground biomass increased with OM enrichment. Nitrogen and phosphorus concentration of seagrass leaves was lower with increasing OM.
Conclusions: Seagrass derived OM has been considered a refractory store of carbon, yet here we show its deposition into sediments significantly alters belowground conditions. Remineralization of the OM changes both physical and chemical nature of sediments that leads to greater biochemical activity, change in microbial communities and greater investment into above ground photosynthetic biomass. The presence of OM may assist seagrass seedling survival during early development by enhancing root branching and stability in sediments, but is unlikely to provide nutritional benefits. © 2015, Springer International Publishing Switzerland.
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- 2 Finished
Overcoming Critical Recruitment Bottlenecks Limiting Seedling Establishment in Degraded Seagrass Ecosystems: A Systems Approach to Restoration
Kendrick, G., Duarte, C., Dixon, K., Merritt, D., Orth, R., Broenland, E. & Williams, M.
1/01/13 → 31/12/16
Kendrick, G., Krauss, S., Waycott, M. & Dixon, K.
30/06/10 → 30/06/13