Combining ballast water exchange and treatment to maximize prevention of species introductions to freshwater ecosystems

Briski, Elizabeta, Gollasch, Stephan, David, Matej, Linley, R. Dallas, Monroy, Oscar Casas, Rajakaruna, Harshana and Bailey, Sarah A. (2015) Combining ballast water exchange and treatment to maximize prevention of species introductions to freshwater ecosystems Environmental Science & Technology, 49 (16). pp. 9566-9573. DOI 10.1021/acs.est.5b01795.

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Abstract

The most effective way to manage species transfers is to prevent their introduction via vector regulation. Soon, international ships will be required to meet numeric ballast discharge standards using ballast water treatment (BWT) systems, and ballast water exchange (BWE), currently required by several countries, will be phased out. However, there are concerns that BWT systems may not function reliably in fresh and/or turbid water. A land-based evaluation of simulated ‘BWE plus BWT’ versus ‘BWT alone’ demonstrated potential benefits of combining BWE with BWT for protection of freshwater ecosystems. We conducted ship-based testing to compare the efficacy of ‘BWE plus BWT’ versus ‘BWT alone’ on voyages starting with freshwater ballast. We tested the hypotheses that there is an additional effect of ‘BWE plus BWT’ compared to ‘BWT alone’ on the reduction of plankton, and that taxa remaining after ‘BWE plus BWT’ will be marine (low risk for establishment at freshwater recipient ports). Our study found that BWE has significant additional effect on the reduction of plankton, and this effect increases with initial abundance. As per expectations, ‘BWT alone’ tanks contained higher risk freshwater or euryhaline taxa at discharge, while ‘BWE plus BWT’ tanks contained mostly lower risk marine taxa unlikely to survive in recipient freshwater ecosystems.

Document Type: Article
Additional Information: WOS:000359891700022
Keywords: LAURENTIAN GREAT-LAKES; SHIPS BALLAST; BIOLOGICAL INVASIONS; TRANSPORT STAGE; BALTIC SEA; EFFICACY; PHYTOPLANKTON; INVERTEBRATES; MANAGEMENT; FILTRATION
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
DOI etc.: 10.1021/acs.est.5b01795
ISSN: 0013-936X
Date Deposited: 22 Jul 2015 07:45
Last Modified: 12 Apr 2017 09:44
URI: http://eprints.uni-kiel.de/id/eprint/29285

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