Factors determining the dynamics of toxic blooms of Alexandrium minutum during a 10-year study along the shallow southwestern Mediterranean coasts

详细信息	查看全文 | 推荐本文 |

• 作者：Moufida Abdenadher^a ; Asma Hamza^a ; Wafa Fekih^a ; Imen Hannachi^b ; Amel Zouari Bellaaj^a ; Mohamed Nejmeddine Bradai^a ; Lotfi Aleya^c ; ^{lotfi.aleya@univ-fcomte.fr}
• 关键词：Alexandrium minutum ; distribution ; beach samples ; southwestern Mediterranean ; HAB
• 刊名：Estuarine ; Coastal and Shelf Science
• 出版年：2012
• 期刊代码：79_02727714
• 类别：env
• 出版时间：20 June, 2012
• 卷：106
• 期：Complete
• 页码：102-111
• 文件大小：1590 K

摘要

Many blooms of the toxic dinoflagellate Alexandrium minutum have been recorded since 1990 in the Gulf of Gabes (southwestern Mediterranean Sea). To understand the determining factors of bloom formation, we studied the distribution of A.聽minutum in relation to environmental factors in samples taken at shallow sandy (<1聽m) beach stations and a lagoon between 1997 and 2006. This was accompanied by laboratory experiments to identify A.聽minutum. The species forms harmful algal blooms (HABs) in stations subjected to anthropogenic eutrophication and in confined lagoons, living under conditions of varying salinity which gives it a unique opportunity to broaden its physiological tolerance and increase its colonisation potential. Increases in phosphorus appear to be more important than nitrogen or temperature in the control of A.聽minutum. The stations sampled all along the coast present specific hydrographic properties (shallowness, turbulence) suggesting that factors other than temperature and nutrients influence Alexandrium distribution, the exception being Boughrara Lagoon where the species developed in accordance with published data. Our findings and their interpretations indicate that the mechanism of the sudden A.聽minutum blooms along the nearshore of the Gulf of Gabes was complex and differed from that of true coastal ecosystems.