Benthic foraminiferal assemblages and morphological abnormalities as pollution proxies in two Egyptian bays

Samir, Ashraf M.; EL-Din, A. Badr

doi:10.1016/s0377-8398(00)00061-x

Cited by 173 publications

(108 citation statements)

References 33 publications

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“…This density increment is a biological effect that agrees with previous studies of domestic waste influence and organic enrichment on benthic foraminiferal populations (Watkins, 1961;Seiglie, 1971;Bates and Spencer, 1979;Alve, 1991Alve, , 1995Yanko et al, 1994;Samir andEl-Din, 2001, Burone et. al., 2006).…”

Section: Stations Group Isupporting

confidence: 91%

Foraminiferal assemblages in the Ubatuba Bay, south-eastern Brazilian Coast

Burone¹,

Pires-Vanin²

2006

Sci. Mar.

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Section: Stations Group Isupporting

confidence: 91%

Foraminiferal assemblages in the Ubatuba Bay, south-eastern Brazilian Coast

Burone¹,

Pires-Vanin²

2006

Sci. Mar.

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“…We found no sign of any deformed foraminiferal shells in the cores, suggesting that neither natural environmental stress levels nor heavy metal concentrations were sufficient for these to be generated. Elsewhere, where significant numbers of deformed foraminiferal shells have been attributed to heavy metal pollution, concentrations of Pb, Cu, and probably other elements, have been one or two orders of magnitude higher than recorded in this study (e.g., Alve 1991;Samir & El-Din 2001).…”

Section: Sediment Grain Size Influence On the Foraminiferacontrasting

confidence: 55%

Foraminiferal record of sewage outfall impacts on the inner Manukau Harbour, Auckland, New Zealand

Matthews¹,

Grenfell²,

Hayward³

et al. 2005

New Zealand Journal of Marine and Freshwater Research

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The fossil foraminiferal faunas preserved in intertidal sediment in six cores document the impact of human activities on the ecosystems of the north-east arm of the Manukau Harbour, Auckland, New Zealand. They indicate that Polynesian forest clearance and horticulture had negligible impact on the harbour biota. Before 1960, organic-rich discharges from four large meat works around the head of Mangere Inlet produced changes in nearby foraminiferal faunas but did not affect faunas in the more seaward part of the arm. Initial early European increases in organic nutrients from the meat works resulted in the development of weak hypertrophic zones around the outfalls, characterised by higher absolute abundances of benthic foraminifera and ostracods and possible benthic algal blooms. Higher organic nutrient levels in one core closer to an outfall produced eutrophic and anoxic conditions with no foraminifera (abiotic zone the meat works and other outfalls progressively closed. This change coincided with a sharp increase in zinc (Zn) and lead (Pb) levels in sediments throughout the arm, attributed to a rapid increase in motor vehicle numbers and stormwater run-off. The MSTP discharged vast quantities of nutrient-and mud-rich fresh water into the seaward part of the arm, resulting in an order of magnitude increase in sedimentation rates throughout most of the arm and a widespread change in the foraminiferal faunas. Foraminiferal abundance generally decreased and species diversity increased with the appearance of numerous juvenile foraminiferal shells carried in by the incoming tide from subtidal habitats nearer the harbour mouth. Also appearing in large numbers in the post-1960 sediment are planktic foraminifera, large diatom valves, and sponge sterrasters, all of which are inferred to have been transported in. The sudden increase in displaced microfossils may be a result of a combination of fresh water-induced flocculation and increased "stickiness" of the substrate from the growth of benthic algal mats, resulting from the high nutrient output from the MSTP.

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“…El-Mex Bay receives a heavy load of wastewater (2.4×109 m3/year) both directly to the sea from industrial outfalls and indirectly from Lake Maryout via El-Mex Pumping station [8], which lies about 1 km upstream on El-Umum Drain, is mainly agricultural drainage water collected by El-Umum Drain but also comprises the overflow from Lake Maryout [9]. Also, shipping activities in the harbors (eastern and western harbors as well as the Bays; El-Mex and Abu Qir Bays) contribute to the area pollution [10]. The study of pollutants in the Egyptian Mediterranean Sea has been investigated by numerous workers [11,12].…”

Section: Introductionmentioning

confidence: 99%

Distribution and Seasonal Variation of Nutrient Salts and Chlorophyll-a in Surface Seawater Along Alexandria Costal Zone Area

Dango¹

2015

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Abstract:The aim of the present study is to investigate the hydrographic characteristics, nutrient salts and chlorophyll-a (Chl-a) along Alexandria Costal Zone Area. The study revealed that the pH values lie slightly in the alkaline side, with a range of 7.53 to 8.12, salinity showed a slightly variation, it ranged from 35.34 to 38.28 PSU, the values of dissolved oxygen were fluctuated between 4.77 and 11.13 mgl -1 . The annual average of nutrients (µM) was as follow: (7.97 ± 1.72), (0.66 ± 0.14), (2.18 ± 0.73), (0.37± 0.09) and (12.42 ± 4.04) for nitrate, nitrite, ammonium, reactive phosphate and silicate, respectively. Relatively high levels of Chl-a concentrations was recorded during the period of study ranged from 0.38 to 6.96µgl -1 and a positive correlation was found between Chl-a and both NO 3 , NH 4 , PO 4 and SiO 4 (r= 0.383, 0.303, 0.213 and 0.341, respectively). Very high values of N/P ratio were recorded during the study period, this consideration showed that Phosphorus was limiting factor in the study area.

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Benthic foraminiferal assemblages and morphological abnormalities as pollution proxies in two Egyptian bays

Cited by 173 publications

References 33 publications

Foraminiferal assemblages in the Ubatuba Bay, south-eastern Brazilian Coast

Foraminiferal assemblages in the Ubatuba Bay, south-eastern Brazilian Coast

Foraminiferal record of sewage outfall impacts on the inner Manukau Harbour, Auckland, New Zealand

Distribution and Seasonal Variation of Nutrient Salts and Chlorophyll-a in Surface Seawater Along Alexandria Costal Zone Area

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