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Mangrove litter fall: Extrapolation from traps to a large tropical macrotidal harbour.

Metcalfe, Kristin N., Franklin, Donald C. and McGuinness, Keith A. (2011). Mangrove litter fall: Extrapolation from traps to a large tropical macrotidal harbour.. Estuarine, Coastal and Shelf Science,95(1):245-252.

Document type: Journal Article

IRMA ID 82057923xPUB59
Title Mangrove litter fall: Extrapolation from traps to a large tropical macrotidal harbour.
Author Metcalfe, Kristin N.
Franklin, Donald C.
McGuinness, Keith A.
Journal Name Estuarine, Coastal and Shelf Science
Publication Date 2011
Volume Number 95
Issue Number 1
ISSN 0272-7714   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-82855161326
Start Page 245
End Page 252
Total Pages 8
Place of Publication United Kingdom
Publisher Academic Press
HERDC Category C1 - Journal Article (DIISR)
Abstract Mangrove litter is a major source of organic matter for detrital food chains in many tropical coastal ecosystems, but scant attention has been paid to the substantial challenges in sampling and extrapolation of rates of litter fall. The challenges arise due to within-stand heterogeneity including incomplete canopy cover, and canopy that is below the high tide mark. We sampled litter monthly for three years at 35 sites across eight mapped communities in the macrotidal Darwin Harbour, northern Australia. Totals were adjusted for mean community canopy cover and the occurrence of canopy below the high tide mark. The mangroves of Darwin Harbour generate an estimated average of 5.0 t ha-1 yr-1 of litter. This amount would have been overestimated by 32% had we not corrected for limited canopy cover and underestimated by 11% had we not corrected for foliage that is below the high tide mark. Had we made neither correction, we would have overestimated litter fall by 17%. Among communities, rates varied 2.6-fold per unit area of canopy, and 3.9-fold among unit area of community. Seaward fringe mangroves were the most productive per unit of canopy area but the canopy was relatively open; Tidal creek forest was the most productive per unit area of community. Litter fall varied 1.1-fold among years and 2.0-fold among months though communities exhibited a range of seasonalities. Our study may be the most extensively stratified and sampled evaluation of mangrove litter fall in a tropical estuary. We believe our study is also the first such assessment to explicitly deal with canopy discontinuities and demonstrates that failure to do so can result in considerable overestimation of mangrove productivity.
Keywords mangals
carbon cycle
leaf litter
plant communities
vegetation cover
statistical sampling
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Created: Fri, 17 Jan 2014, 00:50:31 CST