Carbonate chemistry dynamics in shellfish farming areas along the Chilean coast: natural ranges and biological implications. (7th September 2020)

• Record Type: Journal Article
• Authors: Saavedra, Luisa M; Saldías, Gonzalo S; Broitman, Bernardo R; Vargas, Cristian A
• Editors: Birchenough, Silvana
• Is Part Of: ICES journal of marine science. Volume 78:Number 1(2021)
• Page Start: 323
• Page End: 339
• Publication Date: 2020-09-07
• Subjects: bivalve aquaculture -- carbonate system -- climate change -- nearshore -- variability; Ocean -- Periodicals; Fisheries -- Periodicals; Fishes -- Periodicals; Marine biology -- Bibliography -- Periodicals; 551.4605
• DOI: 10.1093/icesjms/fsaa127
• Languages: English
• ISSNs: 1054-3139

Abstract

Abstract: The increasing shellfish aquaculture requires knowledge about nearshore environmental variability to manage sustainably and create climate change adaptation strategies. We used data from mooring time series and in situ sampling to characterize oceanographic and carbonate system variability in three bivalve aquaculture areas located along a latitudinal gradient off the Humboldt Current System. Our results showed pHT <8 in most coastal sites and occasionally below 7.5 during austral spring–summer in the lower (−30°S) and central (−37°S) latitudes, related to upwelling. Farmed mussels were exposed to undersaturated (Ωarag < 1) and hypoxic (<2 ml l −1 ) waters during warm seasons at −37°S, while in the higher latitude (43°S) undersaturated waters were only detected during colder seasons, associated with freshwater runoff. We suggest that both Argopecten purpuratus farmed at −30°S and Mytilus chilensis farmed at −43°S may enhance their growth during summer due to higher temperatures, lower p CO2, and oversaturated waters. In contrast, Mytilus galloprovincialis farmed at 37°S grows better during spring–summer, following higher temperatures and high p CO2 . This knowledge is relevant for aquaculture, but it must be improved using high-resolution time series and in situ experimentation with farmed species to aid their adaptation to climate change and ocean acidification.