Nutrients and clam contamination by Escherichia coli in a meso-tidal coastal lagoon: Seasonal variation in counter cycle to external sources

被引：2

作者：

Botelho, Maria Joao ^{[1
,2
]}

Soares, Florbela ^{[1
]}

Matias, Domitilia ^{[1
,2
]}

Vale, Carlos ^{[1
,2
]}

机构：

[1] IPMA, Portuguese Inst Sea & Atmosphere, P-1449006 Lisbon, Portugal

[2] Univ Porto, CIIMAR, Interdisciplinary Ctr Marine & Environm Res, P-4050123 Oporto, Portugal

来源：

MARINE POLLUTION BULLETIN | 2015年 / 96卷 / 1-2期

关键词：

Ria Formosa; Nutrients; Bivalves; Escherichia coli; RIA FORMOSA LAGOON; RUDITAPES-DECUSSATUS L; SOUTHERN PORTUGAL; WATER EXCHANGES; SEDIMENTS; AMMONIUM; REMINERALIZATION; PHOSPHATE; SHELLFISH; DYNAMICS;

D O I：

10.1016/j.marpolbul.2015.05.030

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The clam Ruditapes decussatus was transplanted from a natural recruitment area of Ria Formosa to three sites, surveyed for nutrients in water and sediments. Specimens were sampled monthly for determination of Escherichia coli, condition index and gonadal index. Higher nutrient values in low tide reflect drainage, anthropogenic sources or sediment regeneration, emphasising the importance of water mixing in the entire lagoon driven by the tide. Despite the increase of effluent discharges in summer due to tourism, nutrient concentrations and E. coli in clams were lower in warmer periods. The bactericide effect of temperature and solar radiation was better defined in clams from the inlet channel site than from sites closer to urban effluents. High temperature in summer and torrential freshwater inputs to Ria Formosa may anticipate climate change scenarios for south Europe. Seasonal variation of nutrients and dam contamination may thus point to possible alterations in coastal lagoons and their ecosystem services. (C) 2015 Published by Elsevier Ltd.

引用

页码：188 / 196

页数：9