INCREASED EUTROPHICATION OF THE NORTHERN ADRIATIC SEA - 2ND ACT
INCREASED EUTROPHICATION OF THE NORTHERN ADRIATIC SEA - 2ND ACT
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DOI：
10.1016/0025-326x(89)90066-0
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发表时间：
1989-09-01
影响因子：
5.8
通讯作者：
DEGOBBIS, D
中科院分区：
文献类型：
--
作者：
DEGOBBIS, D
Very calm and warm weather in late spring and early summer 1988 supported intense non-seasonal phytoplankton blooms in the western part of the northern Adriatic which is under direct influence of Po River discharge. Surface salinity decreased to 16 .times. 10-3, and concentration of chlorophyll a increased up to 17 mg m-3, with oxygen supersaturation to 203 .times. 10-2. Nannoplankton dominated the blooms (up to 76 .times. 109 cells m-3, but diatoms, particularly Chaetoceros spp. (up to 17 .times. 109 cells m-3), also occurred in large numbers. Large ''organic'' aggregates were formed in the water column with dimensions (up to 2 m long) and in quantities never previously observed. During late summer and early fall aggregates were distributed over the entire region, and a general contamination of the coasts occurred. Oxygen concentration was dramatically reduced in the bottom layer of the entire region, an event not observed to such a degree since 1977. During that year, in contrast to 1988, large quantities of fresh water spread over the entire northern Adriatic causing extended phytoplankton blooms. In 1988 extremely low horizontal advection (current velocitis usually below 20 cm s-1) primarily favoured an accumulation and high aggregation of detritus, and greatly reduced oxygen concentration in the bottom layer.
