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ECOLOGY OF GASTROPODA IN A SOUTH AFRICAN MAN-GROVE SWAMP
BROWN, DS
PROC MALACOL SOC LONDON. 39(4): 263-279. ILLUS. 1971.
FORTY-FOUR QUADRAT SAMPLES WERE TAKEN ALONG 3 TRANSECTS THROUGH A
SOUTH AFRICAN MANGROVE SWAMP IN ORDER TO STUDY THE DISTRIBUTIONS
OF GASTROPOD SNAILS. QUANTITATIVE OBSERVATIONS ARE PRESENTED FOR
NERITINA NATALENSIS, ASSIMINEA BIFASCIATA, CERITHIDEA DECOLATA,
MELAMPUS SEMIARATUS, CASSIDULA LABRELLA, AURICULASTRA RADIOLATA.
DISTRIBUTIONS SHOWED HORIZONTAL ZONATION IN RELATION TO A CREEK,
THOUGH SEVERAL SPECIES OCCURRED TOGETHER IN MANY QUADRATS.
DENSITIES VARIED LOCALLY IN RELATION TO THE TEXTURE AND MOISTURE
CONTENT OF THE SUBSTRATUM, AND THE DEGREE OF SHADING. WITH THE
EXCEPTION OF CERITHIDEA DECOLLATA, SNAILS WERE FOUND ALMOST
EXCLUSIVELY ON OR WITHIN THE SUBSTRATUM. RESTING INDIVIDUALS OF C.
DECOLLATA FORMED DENSE AGGREGATIONS ON TREE TRUNKS AND
OBSERVATIONS ON MARKED SNAILS SUGGESTED THAT FEEDING TOOK PLACE ON
THE MUD SURFACE IN AN ACTIVITY CYCLE RELATED TO SPRING TIDES. SOME
ASPECTS OF TROPHIC RELATIONS ARE DISCUSSED.--COPYRIGHT 1971,
BIOLOGICAL ABSTRACTS, INC.
 Descriptors: AFRICAN | ASSIMINEA-BIFASCIATA | AURICULASTRA-RADIOLATA | CASSIDULA-LABRELLA | CERITHIDEA-DECOLLATA | DISTRIBUTION | ECOLOGY | GASTROPODA | MANGROVE | MELAMPUS-SEMIARATUS | NERITINA-NATALENSIS | RELATIONS | SOUTH | SWAMP | TROPHIC
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