Hydrodynamics, organisms and pollution of coastal sands

Webb, J. E.

doi:10.1016/0951-8312(91)90037-3

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…In addition to their toxicity, dispersants are now known to alter the physical properties of sandy beaches and this is thought to account for the majority of observations made on beaches at the time (Webb, 1991). Surfactants alter the cohesiveness of sand through a decrease in interstitial water surface tension.…”

Section: Dumpingmentioning

confidence: 99%

Intertidal Ecology

Raffaelli¹,

Hawkins²

1996

339

253

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Section: Dumpingmentioning

confidence: 99%

Intertidal Ecology

Raffaelli¹,

Hawkins²

1996

339

253

View full text Add to dashboard Cite

“…In fact, sewage discharge alone did not severely affect the diversity patterns in a small Norwegian sill system (JØRGENSEN, 1980;HOLTE, 2001). Furthermore, any increase in the influx of organic material that does not reduce permeability, provides additional food for the organisms, increasing the psammic biomass and thereby the capacity of the sand deposit for processing even large quantities of organics (WEBB, 1991). KJERFVE et al (1997) reported that the time to replace 50% of the water volume of Guanabara Bay is 11.4 days, which is considered fast compared with other bays.…”

Section: Discussionmentioning

confidence: 99%

Polychaete assemblage of an impacted estuary, Guanabara Bay, Rio de Janeiro, Brazil

Santi

Tavares

2009

Braz. j. oceanogr.

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(Avenida Nazaré, 481, São Paulo, SP, Brasil) mdst@usp.br A B S T R A C T Thirty-eight stations were sampled in Guanabara Bay, Rio de Janeiro, Brazil, to assess the spatio-temporal diversity and biomass of sublittoral polychaetes. Samples were collected during the dry (September 2000) and rainy season (May 2001) in shallow sublittoral sediments. The polychaete spatial composition showed a heterogeneous distribution throughout the bay. A negative gradient of diversity and biomass was observed towards the inner parts of the bay and sheltered areas. A wide azoic area was found inside the bay. Some high-biomass and low-diversity spots were found near a sewage-discharge point. In these areas, the polychaete biomass increased after the rainy season. A diversified polychaete community was identified around the bay mouth, with no dramatic changes of this pattern between the two sampling periods. Deposit-feeders were dominant in the entire study area. The relative importance of carnivores and omnivores increased towards the outer sector, at stations with coarse sediment fractions. Guanabara Bay can be divided into three main zones with respect to environmental conditions and polychaete diversity and biomass patterns: A) High polychaete diversity, hydrodynamically exposed areas composed of sandy, oxidized or moderately reduced sediments with normoxic conditions in the water column. B) Low diversity and high biomass of deposit and suspension-feeding polychaete species in the middle part of the bay near continental inflows, comprising stations sharing similar proportions of silt, clay and fine sands. C) Azoic area or an impoverished polychaete community in hydrodynamically low-energy areas of silt and clay with extremely reduced sediments, high total organic matter content and hypoxic conditions in the water column, located essentially from the mid-bay towards the north sector. High total organic matter content and hypoxic conditions combined with slow water renewal in the inner bay seemed to play a key role in the polychaete diversity and biomass. Sedimentation processes and organic load coming from untreated sewage into the bay may have negatively affected the survivorship of the fauna. R E S U M OTrinta e oito estações foram amostradas na Baía de Guanabara, Rio de Janeiro, Brasil, no intuito de descrever a diversidade e biomassa de poliquetas sublitorais. As coletas foram realizadas em dois períodos distintos do ano: seco (Setembro 2000) e chuvoso (Maio de 2001). A distribuição espacial dos poliquetas sublitorais demonstrou ser nitidamente heterogênea na Baía de Guanabara. Um gradiente negativo de diversidade e biomassa foi observado em direção as partes internas e protegidas da baía. Foi encontrada uma grande área azóica dentro da baía. Por outro lado, algumas áreas com alta biomassa e baixa diversidade foram encontradas nas proximidades de locais com despejo de esgoto urbano não tratado. Nestas áreas foi observado aumento da biomassa de poliquetas no período chuvoso. Uma comunidade diversificada foi identificada na...

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Pedal function in nassariid gastropods: crawling and burrowing in Cyclope neritea

Trueman

Brown

1992

Journal of Experimental Marine Biology and Ecology

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Hydrodynamics, organisms and pollution of coastal sands

Cited by 7 publications

References 13 publications

Intertidal Ecology

Intertidal Ecology

Polychaete assemblage of an impacted estuary, Guanabara Bay, Rio de Janeiro, Brazil

Pedal function in nassariid gastropods: crawling and burrowing in Cyclope neritea

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