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RESEARCH ARTICLE (Open Access)

Variability of the carbonate chemistry in a shallow, seagrass-dominated ecosystem: implications for ocean acidification experiments

Roberta C. Challener A D , Lisa L. Robbins B and James B. McClintock C
+ Author Affiliations
- Author Affiliations

A Department of Biology, Bellarmine University, Louisville, KY 40205, USA.

B Saint Petersburg Coastal and Marine Science Center, US Geological Survey, St Petersburg, FL 33701, USA.

C Department of Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.

D Corresponding author. Email rchallener@bellarmine.edu

Marine and Freshwater Research 67(2) 163-172 https://doi.org/10.1071/MF14219
Submitted: 30 July 2014  Accepted: 3 February 2015   Published: 25 May 2015

Journal Compilation © CSIRO Publishing 2016 Open Access CC BY-NC-ND

Abstract

Open ocean observations have shown that increasing levels of anthropogenically derived atmospheric CO2 are causing acidification of the world’s oceans. Yet little is known about coastal acidification and studies are just beginning to characterise the carbonate chemistry of shallow, nearshore zones where many ecologically and economically important organisms occur. We characterised the carbonate chemistry of seawater within an area dominated by seagrass beds (Saint Joseph Bay, Florida) to determine the extent of variation in pH and pCO2 over monthly and daily timescales. Distinct diel and seasonal fluctuations were observed at daily and monthly timescales respectively, indicating the influence of photosynthetic and respiratory processes on the local carbonate chemistry. Over the course of a year, the range in monthly values of pH (7.36–8.28), aragonite saturation state (0.65–5.63), and calculated pCO2 (195–2537 μatm) were significant. When sampled on a daily basis the range in pH (7.70–8.06), aragonite saturation state (1.86–3.85), and calculated pCO2 (379–1019 μatm) also exhibited significant range and indicated variation between timescales. The results of this study have significant implications for the design of ocean acidification experiments where nearshore species are utilised and indicate that coastal species are experiencing far greater fluctuations in carbonate chemistry than previously thought.

Additional keywords: benthic zone, climate change, echinoderms


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