FAUNA AND FLORA O F MANGROVE SWAMPS
135
dwarfing. The only other locality where I have seen dwarfing similar
to that near Auckland is at Inhambane in Moqambique, but here
dwarfing is due to hypersalinity in an infertile well-drained sandy soil.
5 . Effects of erosion on mangrove shores
It has been shown above that a fully zoned mangal is typically
developed on a shore which is recently emergent or t o which silt or
other material is accruing. A mangal on a stable shore line tends to be
less extensive in width, to have a high proportion of mature trees, and
FIG. 35. Erosion of rhizophora forest. Note the shallow root system. This photograph
was taken 300 m from Fig. 34. A field of Sonneratia griflthii and Avicennia marina
extended to seaward on the lower platform. Xanthid crabs are common among
the exposed roots.
135
dwarfing. The only other locality where I have seen dwarfing similar
to that near Auckland is at Inhambane in Moqambique, but here
dwarfing is due to hypersalinity in an infertile well-drained sandy soil.
5 . Effects of erosion on mangrove shores
It has been shown above that a fully zoned mangal is typically
developed on a shore which is recently emergent or t o which silt or
other material is accruing. A mangal on a stable shore line tends to be
less extensive in width, to have a high proportion of mature trees, and
FIG. 35. Erosion of rhizophora forest. Note the shallow root system. This photograph
was taken 300 m from Fig. 34. A field of Sonneratia griflthii and Avicennia marina
extended to seaward on the lower platform. Xanthid crabs are common among
the exposed roots.