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|Name||Castaneda-Moya E.,Rivera-Monroy V. H., Twilley R. R., 2006. Mangrove Zonation in the Dry Life Zone of the Gulf of Fonseca, Honduras. Estuaries and Coasts Vol. 29, No. 5, p. 751–764 October 2006. |
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|Abstract||The structural attributes and zonation patterns of mangrove forests in a dry environmental setting were
evaluated in relation to gradients of soil resources, soil regulators, and hydroperiod between October 2000 and August 2001
in the Gulf of Fonseca, Honduras. Transects perpendicular to the edge of tidal channels were established at four mangrove
sites, each sectioned into three mangrove zones (fringe, transition, and scrub) based upon distinct tree-height gradients.
Porewater sulfide concentrations among zones were normally below levels of detection (< 0.03 mM) and mean redox values
ranged from 163.4 6 9.9 to 242.4 6 15.8 mv, indicating slightly reducing conditions in all zones. Mean porewater NOx- and PO4 3- concentrations were not significantly different among zones and ranged from 3.3 +- 0.5 to 4.5 +- 0.4 mM and from 0.05 +- 0.02 to 0.18 +- 0.04 mM, respectively. Soil nitrogen concentrations were 1–3 mg g21 in all zones, and mean
nitrogen:phosphorus atomic ratios were < 20 (range: 12.9–14.9), indicative of fertile wetland soils. Mean basal areas were
significantly different among mangrove zones (fringe > transition) and were coupled with differences in height within species
and zones. Avicennia germinans occupied areas with higher elevations associated with higher salinities ranging from 80 to
140 g kg-1 in the dry season. Rhizophora mangle dominated lower elevations where salinities ranged from 38 to 57 g kg-1 in
both the dry and wet seasons. Spatial analysis on mangrove seedlings along transects confirmed that seedling distribution
along the intertidal profile was statistically correlated with conspecific adults, indicating that survival and growth of seedlings
in different intertidal locations are closely matched to canopy membership. The sharp transition (< 100 m) in forest
structure and distribution of mangrove species along the intertidal zone of subhumid coastal environments demonstrate
common zonation patterns where species distribution and species-specific habitat suitability are mediated closely with
tolerance to soil regulators (high soil salinity) rather than resource availability.|
|Gulf of Fonsca for Avicennia bicolor Standley |
Gulf of Fonsca for Avicennia germinans (L.) L.
Gulf of Fonsca for Laguncularia racemosa (L.) C.F. Gaertn.
Gulf of Fonsca for Rhizophora mangle L.
Gulf of Fonsca for Rhizophora racemosa Meyer
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|2013-01-12 18:30:12Z|| created|| db_admin|
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