The occurrence and behaviour of phosphate fractions in Izmir Bay, Aegean Sea


Bizsel N., Bizsel K.

HYDROBIOLOGIA, vol.450, no.1-3, pp.5-18, 2001 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 450 Issue: 1-3
  • Publication Date: 2001
  • Doi Number: 10.1023/a:1017949106138
  • Journal Name: HYDROBIOLOGIA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.5-18
  • Keywords: phosphate fractions, phosphate, eutrophication, PCA, Izmir Bay, DISSOLVED ORGANIC PHOSPHORUS, COASTAL-PLAIN ESTUARY, NUTRIENTS, DELAWARE, NITROGEN, PACIFIC, WATERS, FRANCE, CARBON, RIVERS
  • Dokuz Eylül University Affiliated: Yes

Abstract

The area around Izmir Bay (Turkey) is heavily urbanized and receives, therefore, high concentrations of phosphate originating from industrial and municipal inputs. During the surveys between April 1993 and July 1994, the total phosphate concentrations were highest in the Inner Bay (6.45 muM and 5.59 muM in the surface and bottom water, respectively) where very dense anthropogenic pollution occurs. The total phosphate value gradually decreased towards the Outer Bay where 0.70 muM and 1.18 muM were found in the surface and bottom water, respectively. The distribution of dissolved inorganic, dissolved organic and particulate phosphate along the bay reflected some peculiar spatial and temporal patterns. A high percentage of dissolved organic phosphate was observed in the Outer Bay while the particulate phosphate peaked in the Middle Bay where an upwelling mechanism was observed. In the bay, the biological production was strongly correlated with the variations in the dissolved inorganic, organic and particulate phosphate. The high phosphate concentration in particles caused the particulate phosphate formed in the Inner Bay to be transported to the outer parts of the bay because of the short water residence time. On the other hand, Principal Component Analysis showed that about 35% of the variation in all variables measured were related to the total phosphate, total dissolved phosphate, dissolved inorganic phosphate and particulate phosphate together with ammonium and reactive-Fe while about 14% of the variation was related to the dissolved organic phosphate and the number of phytoplankton cells, chl-a, pH and O(2).