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Author Clements, Jeff C ♦ Hunt, Heather L
Source PANGAEA
Content type Text
Publisher PANGAEA
File Format TSV
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Life sciences; biology ♦ Ecology
Subject Keyword Biosphere ♦ Animalia ♦ Benthic animals ♦ Benthos ♦ Coast and continental shelf ♦ Laboratory experiment ♦ Mesococosm or benthocosm ♦ Mollusca ♦ Mya arenaria ♦ North Atlantic ♦ Reproduction ♦ Single species ♦ Temperate
Abstract Although ocean acidification is expected to reduce carbonate saturation and yield negative impacts on open-ocean calcifying organisms in the near future, acidification in coastal ecosystems may already be affecting these organisms. Few studies have addressed the effects of sedimentary saturation state on benthic invertebrates. Here, we investigate whether sedimentary aragonite saturation (Omega aragonite) and proton concentration ([H+]) affect burrowing and dispersal rates of juvenile soft-shell clams (Mya arenaria) in a laboratory flume experiment. Two size classes of juvenile clams (0.5-1.5 mm and 1.51-2.5 mm) were subjected to a range of sediment Omega aragonite and [H+] conditions within the range of typical estuarine sediments (Omega aragonite 0.21-1.87; pH 6.8-7.8; [H+] 1.58 × 10**-8-1.51 × 10**- 7) by the addition of varying amounts of CO2, while overlying water pH was kept constant ~ 7.8 (Omega aragonite ~ 1.97). There was a significant positive relationship between the percent of juvenile clams burrowed in still water and Omega aragonite and a significant negative relationship between burrowing and [H+]. Clams were subsequently exposed to one of two different flow conditions (flume; 11 cm/s and 23 cm/s) and there was a significant negative relationship between Omega aragonite and dispersal, regardless of clam size class and flow speed. No apparent relationship was evident between dispersal and [H+]. The results of this study suggest that sediment acidification may play an important role in soft-shell clam recruitment and dispersal. When assessing the impacts of open-ocean and coastal acidification on infaunal organisms, future studies should address the effects of sediment acidification to adequately understand how calcifying organisms may be affected by shifting pH conditions.
Spatial Coverage Latitude: 45.124670;Longitude: -66.471660
Description Project(s):Ocean Acidification International Coordination Centre (OA-ICC);Note: 800 data points
Part of series Supplement to: Clements, JC; Hunt, HL (2014): Influence of sediment acidification and water flow on sediment acceptance and dispersal of juvenile soft-shell clams (Mya arenaria L.). Journal of Experimental Marine Biology and Ecology, 453, 62-69, https://doi.org/10.1016/j.jembe.2014.01.002
Educational Use Research
Learning Resource Type Data Set
Publisher Date 2014-07-09
Rights License https://creativecommons.org/licenses/by/3.0/


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