CONCENTRATIONS OF HEAVY METALS IN SEDIMENT AND ORGANISMS DURING A HARMFUL ALGAL BLOOM (HAB) AT KUN KAAK BAY SONORA MEXICO
In early April 2003, fishermen from Kino Bay Sonora alerted us about a massive die-off of fish and mollusks occurring at Kun Kaak Bay. Phytoplankton samples taken on 17 May 2003 reported the presence of a harmful algal bloom composed of Chatonella marina, Chatonella cf. ovata, Gymnodinium catenatum...
| Autores: | , , , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2005 |
| País: | México |
| Recursos: | Universidad Autónoma de Nayarit |
| Repositório: | Repositorio Institucional Aramara de la UAN |
| Idioma: | espanhol |
| OAI Identifier: | oai:dspace.uan.mx:123456789/2237 |
| Acesso em linha: | https://doi.org/10.1016/j.marpolbul.2005.02.027 http://dspace.uan.mx:8080/jspui/handle/123456789/2237 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Heavy metals Harmful algal bloom (HAB) Sediment Mollusks Kun Kaak Bay BIOLOGÍA Y QUÍMICA [2] |
| Resumo: | In early April 2003, fishermen from Kino Bay Sonora alerted us about a massive die-off of fish and mollusks occurring at Kun Kaak Bay. Phytoplankton samples taken on 17 May 2003 reported the presence of a harmful algal bloom composed of Chatonella marina, Chatonella cf. ovata, Gymnodinium catenatum and Gymnodinium sanguineum. On 22 of May, we collected samples of water, sediment and organisms at the affected area. Physicochemical parameters and nutrients were measured in water samples from different depths. Sediment and benthic organisms were analyzed for Cd, Cu, Zn, Pb and Hg. We found concentrations of heavy metals higher than background levels for this area. Cadmium and Lead concentrations in sediment from the HAB area were up to 6× greater than background levels and Cd in mollusks was 8× greater than regulations allow. A relationship between elevated Cd and Pb concentrations in sediment and the survival of toxic dinoflagellates is suspected. |
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