OXYGEN PROFILES IN INTERTIDAL SEDIMENTS OF RIA FORMOSA (S PORTUGAL)

被引:45
作者
BROTAS, V [1 ]
AMORIMFERREIRA, A [1 ]
VALE, C [1 ]
CATARINO, F [1 ]
机构
[1] INST NACL INVEST PESCAS,P-1400 LISBON,PORTUGAL
关键词
OXYGEN PROFILES; SEDIMENT-WATER INTERFACE; INTERTIDAL ZONES;
D O I
10.1007/BF00041448
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Microelectrode oxygen profiles were measured in intertidal sediments from Ria Formosa (S. Portugal), a very productive shallow coastal lagoon. Four intertidal sampling sites were selected according to different sediment characteristics. Individual profiles revealed a high degree of lateral variability on a centimeter spatial scale. Nevertheless, consistent differences were observed between oxygen profiles measured in atmosphere-exposed and inundated intertidal sediments: in organically poor sand oxygen-penetration depth varied from 3 mm in inundated cores to more than 7 mm in exposed ones, while in organically rich muddy sand and mud it remained between 0.5-2.0 mm. The oxygen input from inundated to exposed conditions was estimated for each sampling site. Semi-diurnal tidal fluctuation, leading to periodical atmospheric exposure of sediments plays a major role in the oxygenation process of intertidal zones of Ria Formosa.
引用
收藏
页码:123 / 129
页数:7
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