The ecology of two sandy beaches in south west India. I. Seasonal changes in physical and chemical factors, and in the macrofauna

Ansell, A. D.; Sivadas, P.; Narayanan, Badri; Sankaranarayanan, V.N.; Trevallion, Ann

doi:10.1007/bf00346953

Cited by 41 publications

(1 citation statement)

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“…An accentuated decrease in the mollusc fauna richness and abundance was observed after this disturb, with the excIusion of species associated with rocks (Denadai & Amaral, 1999), mainly gastropods and some bivalves (A. adamsi, Corbula caribaea and C. cubaniana). In fact, storms and monsoons are known to play an important role in community structure by eroding sandy beaches (Ansell et a!., 1972;Ong & Krishnan, 1995). McLachlan (1996) observed changes in the macrofaunal composition (abundance and species excIusion) in a sandy beach after coarse sand addition originating from diamond mines in Namibia, thus reinforcing the importance of sediment constitution to sandy beach macrofaunal structure (Dexter, 1984;McLachlan, 1990).…”

Section: Discussionmentioning

confidence: 93%

Annual variation of the malacofauna on two intertidal sandy substrates with rock fragments in southeastern Brazil

2000

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The temporal variation in molluscan communities was studied in two intertidal substrates composed of sand and rock fragments <300 mm) in São Sebastião Channel, Brazil. Samples were taken between August 1995 and July 1996 in São Francisco (mainland) and Engenho d'Água (São Sebastião Island) beaches. A pronounced decrease in abundance and diversity of molluscs was associated with changes in the structure of the environment, caused by sea storms in the beginning of the summer (December), and by the increase of waste water discharge in this same period. Areas not subjected to such events showed no evident modifications in mollusc fauna structure during the sampling period, and the small oscillations observed were attributed to population recruitment. Both natural and human factors may be acting together in determining the community organization in these environments, as is also in typical sandy beaches.
Estudou-se a variação anual da comunidade de moluscos em dois ambientes entremarés constituídos por areia e fragmentos rochosos <300 mm) no Canal de São Sebastião, Brasil. As amostras foram obtidas mensalmente entre agosto de 1995 e julho de 1996 nas praias São Francisco (continente) e Engenho d'Água (Ilha de São Sebastião). Uma marcante redução na abundância e diversidade foi associada às mudanças estruturais do ambiente, causada por ressacas do mar no início do verão (dezembro), e ao aumento no fluxo de esgotos domésticos neste período. Em áreas onde estes eventos não foram evidentes, não houve grande alteração na composição faunística, e as pequenas oscilações foram atribuídas ao recrutamento de populações numericamente importantes. Ambos os fatores naturais e antrópicos podem estar atuando em conjunto para determinar a organização da comunidade nestes ambientes, tal como ocorre em praias arenosas típicas

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