A dual indicator approach for monitoring benthic impacts from organic enrichment with test application near Atlantic salmon farms.

Autor: Cranford PJ; Fisheries and Oceans Canada, Bedford Institute of Oceanography, 1 Challenger Dr., Dartmouth, Nova Scotia B2Y 4A2, Canada. Electronic address: Peter.Cranford@dfo-mpo.gc.ca., Brager L; Fisheries and Oceans Canada, Bedford Institute of Oceanography, 1 Challenger Dr., Dartmouth, Nova Scotia B2Y 4A2, Canada. Electronic address: Lindsay.Brager@dfo-mpo.gc.ca., Wong D; Fisheries and Oceans Canada, St. Andrews Biological Station, 531 Brandy Cove Rd., St. Andrews, New Brunswick E5B 2L9, Canada. Electronic address: David.Wong@dfo-mpo.gc.ca.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2017 Nov 15; Vol. 124 (1), pp. 258-265. Date of Electronic Publication: 2017 Jul 24.
DOI: 10.1016/j.marpolbul.2017.07.049
Abstrakt: The organic enrichment of surficial sediments has a known effect on benthic faunal communities due largely to oxygen depletion and sulfide toxicity. Total dissolved sulfide (free S -2 =H 2 S+HS - +S 2- ) concentrations in sediments are widely measured as a practical indicator of community effects. However, the standard ion selective electrode (ISE) method for free S -2 analysis can provide biased results owing to the inclusion of non-toxic mineral sulfides and the oxidation and volatilization of free S -2 . A rapid field protocol was developed that alleviates these problems while also providing data on dissolved oxygen concentrations. Sediments collected near salmon aquaculture pens over cohesive and permeable substrates were analysed using the standard and new protocols. The results confirm previous conclusions of artifacts with the standard ISE method, while the dual indicator approach more accurately describes the stages, spatial extent and magnitude of sediment geochemical alterations affecting benthic communities.
(Crown Copyright © 2017. Published by Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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