Organic matter, sediment particle size and nutrient distributions in a sewage affected shallow channel

Total mercury in marine sediments near a sewage outfall. Relation with organic matter.

“…Certified grade reagents were used for the calibration curve and the blank solutions. Mercury determinations were carried out on samples previously analyzed for total protein, % silt-clay, and humic material contents (6). TABLE 1 shows total mercury values as determined in sediments of the corresponding stations, as well as total protein and humic-substance values corresponding to the Bahia Blanca samples.…”

Global change effects on biogeochemical processes of Argentinian estuaries: An overview of vulnerabilities and ecohydrological adaptive outlooks

“…Some of the causes of this catastrophe were not only heavy rainfall but also the lack of waterworks, poor environmental awareness, and deforestation. In the Bahía Blanca case, the first report of pollution by raw sewage discharge was mentioned in 1985 (Lara et al, 1985) and is still used as a case study after approximately 30 years (Dutto et al, 2014). Moreover, in the proposal for dredging a navigation channel in the inner estuary of Bahía Blanca, the social costs derived from the loss of the nursery function of the estuary and the loss of jobs associated with fishing activities of about $5 and 6.5 million were not included in the initial study of environmental impact (Zilio et al, 2013).…”

“…Despite this ecological importance, the system is strongly impacted by industrial activities and maritime traffic. The Bahía Blanca estuary is considered highly eutrophic (Freije et al, 2008) and is polluted by untreated sewage discharge (Lara et al, 1985;Biancalana et al, 2012;Dutto et al, 2014), hydrocarbons (Lara et al, 1995;Arias et al, 2010), heavy metals (Marcovecchio and Ferrer, 2005;Simonetti et al, 2012;Fernández-Severini et al, 2013), and organotin compounds (Delucchi et al, 2007). The invading species B. glandula and the copepod Eurytemora americana have caused changes in species richness and diversity (Hoffmeyer, 2004).…”

Sewage pollution effects on mesozooplankton structure in a shallow temperate estuary

“…Bahía Blanca city's effluent, in particular, has been physically and chemically characterized (Lara et al 1985;Tombesi et al 2000;Hoffmeyer et al 2004) and its effects on the biota have been evaluated through bioindicators such as bacteriae (Baldini and Cabezalí 1988;Baldini et al 1999) and planktonic ciliates (Barría de Cao et al 2003) in different areas of the estuary. The composition, structure and dynamics of meso-and macrozooplankton fractions related to environmental features of Bahía Blanca estuary are well-known (Cervellini 1986(Cervellini , 2001Hoffmeyer 1983Hoffmeyer , 1994Hoffmeyer , 2004Hoffmeyer and Cervellini 2004;Sabatini 1989, among others).…”