Your browser doesn't support javascript.
loading
Setting a size-exclusion limit to remove toxic dinoflagellate cysts from ships' ballast water.
Doblin, Martina A; Dobbs, Fred C.
Afiliação
  • Doblin MA; Department of Environmental Sciences/Institute for Water and Environmental Resource Management, University of Technology, P.O. Box 123 Broadway, Sydney, NSW 2007, Australia. martina.doblin@uts.edu.au
Mar Pollut Bull ; 52(3): 259-63, 2006 Mar.
Article em En | MEDLINE | ID: mdl-16480748
ABSTRACT
Dinoflagellate cysts are well-recognized biological constituents of ships' ballast tanks. They are present in ballast water, sediments and residual water in drained tanks, and in biofilms formed on interior tank surfaces. Therefore, cysts have the potential to be released during ballast discharge. The International Maritime Organization's (IMO) Ballast Water Management Convention (promulgated February 2004) stipulates a performance standard (Annex, Regulation D2) requiring discharged ballast water contain <10 viable organisms between 10 and 50 microm per ml and <10 viable organisms 50 microm per m3. The proposed size limit has potential to exclude both the smallest toxic and the largest toxic and non-toxic dinoflagellate (and other microalgal) cysts from discharged ballast water. Despite the appropriateness of size cutoffs however, ballast water containing predominantly small cysts (<50 microm) could be deemed in compliance with the performance standard, even without treatment, while ballast water having the same concentration of larger cysts (>50 microm) could require a multiple-log reduction in abundance before its permissible discharge. Also of concern, it remains uncertain whether ballast-water treatment can remove sufficient organisms, including dinoflagellate cysts, to meet the performance standard.
Assuntos
Buscar no Google
Base de dados: MEDLINE Assunto principal: Navios / Microbiologia da Água / Dinoflagellida / Eliminação de Resíduos Líquidos / Monitoramento Ambiental Idioma: En Ano de publicação: 2006 Tipo de documento: Article
Buscar no Google
Base de dados: MEDLINE Assunto principal: Navios / Microbiologia da Água / Dinoflagellida / Eliminação de Resíduos Líquidos / Monitoramento Ambiental Idioma: En Ano de publicação: 2006 Tipo de documento: Article