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Assessing physiological tipping point of sea urchin larvae exposed to a broad range of pH

Journal article
Authors Narimane Dorey
Pauline Lancon
Michael C. Thorndyke
Samuel Dupont
Published in Global Change Biology
Volume 19
Issue 11
Pages 3355-3367
ISSN 1354-1013
Publication year 2013
Published at Linnaeus Centre for Marine Evolutionary Biology (CEMEB)
Department of Biological and Environmental Sciences
Pages 3355-3367
Language en
Links dx.doi.org/10.1111/gcb.12276
Keywords development, morphometric, ocean acidification, physiology, Strongylocentrotus droebachiensis, INDUCED SEAWATER ACIDIFICATION, OCEAN-ACIDIFICATION, STRONGYLOCENTROTUS-DROEBACHIENSIS, INTRACELLULAR-PH, MYTILUS-EDULIS, CARBONIC-ACID, CO2, GROWTH, CALCIFICATION, EMBRYOS, ATES OF AMERICA, V109, P18192, RATHMANN R, 1978, JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, V34, P23, ARR M, 1992, MARINE ECOLOGY PROGRESS SERIES, V79, P275, RISTEN R, 1982, JOURNAL OF BIOLOGICAL CHEMISTRY, V257, P4881, ARR M, 1990, SCIENCE, V247, P1071
Subject categories Environmental Sciences

Abstract

Our ability to project the impact of global change on marine ecosystem is limited by our poor understanding on how to predict species sensitivity. For example, the impact of ocean acidification is highly species-specific, even in closely related taxa. The aim of this study was to test the hypothesis that the tolerance range of a given species to decreased pH corresponds to their natural range of exposure. Larvae of the green sea urchin Strongylocentrotus droebachiensis were cultured from fertilization to metamorphic competence (29days) under a wide range of pH (from pH(T)=8.0/pCO(2)approximate to 480atm to pH(T)=6.5/pCO(2)approximate to 20000atm) covering present (from pH(T) 8.7 to 7.6), projected near-future variability (from pH(T) 8.3 to 7.2) and beyond. Decreasing pH impacted all tested parameters (mortality, symmetry, growth, morphometry and respiration). Development of normal, although showing morphological plasticity, swimming larvae was possible as low as pH(T)7.0. Within that range, decreasing pH increased mortality and asymmetry and decreased body length (BL) growth rate. Larvae raised at lowered pH and with similar BL had shorter arms and a wider body. Relative to a given BL, respiration rates and stomach volume both increased with decreasing pH suggesting changes in energy budget. At the lowest pHs (pH(T)6.5), all the tested parameters were strongly negatively affected and no larva survived past 13days post fertilization. In conclusion, sea urchin larvae appeared to be highly plastic when exposed to decreased pH until a physiological tipping point at pH(T)=7.0. However, this plasticity was associated with direct (increased mortality) and indirect (decreased growth) consequences for fitness.

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Utskriftsdatum: 2020-08-07