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Vulnerability of the calcifying larval stage of the Antarctic sea urchin Sterechinus neumayeri to near-future ocean acidification and warming

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Byrne, M and Ho, MA and Koleits, L and Price, C and King, K and Virtue, P and Tilbrook, B and Lamare, M (2013) Vulnerability of the calcifying larval stage of the Antarctic sea urchin Sterechinus neumayeri to near-future ocean acidification and warming. Global Change Biology, 19. pp. 2264-2275. ISSN 1354-1013

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Abstract

Stenothermal polar benthic marine invertebrates are highly sensitive to environmental perturbations but little is
known about potential synergistic effects of concurrent ocean warming and acidification on development of their
embryos and larvae. We examined the effects of these stressors on development to the calcifying larval stage in the
Antarctic sea urchin Sterechinus neumayeri in embryos reared in present and future (2100+) ocean conditions from
fertilization. Embryos were reared in 2 temperature (ambient: 1.0 °C, + 2 °C : 1.0 °C) and 3 pH (ambient: pH 8.0,
0.2–0.4 pH units: 7.8,7.6) levels. Principle coordinates analysis on five larval metrics showed a significant effect of
temperature and pH on the pattern of growth. Within each temperature, larvae were separated by pH treatment, a
pattern primarily influenced by larval arm and body length. Growth was accelerated by temperature with a 20–28%
increase in postoral (PO) length at +2 °C across all pH levels. Growth was strongly depressed by reduced pH with a
8–19% decrease in PO length at pH 7.6–7.8 at both temperatures. The boost in growth caused by warming resulted in
larvae that were larger than would be observed if acidification was examined in the absence of warming. However,
there was no significant interaction between these stressors. The increase in left-right asymmetry and altered body
allometry indicated that decreased pH disrupted developmental patterning and acted as a teratogen (agent causing
developmental malformation). Decreased developmental success with just a 2 °C warming indicates that development
in S. neumayeri is particularly sensitive to increased temperature. Increased temperature also altered larval
allometry. Altered body shape impairs swimming and feeding in echinoplutei. In the absence of adaptation, it
appears that the larval phase may be a bottleneck for survivorship of S. neumayeri in a changing ocean in a location
where poleward migration to escape inhospitable conditions is not possible.

Item Type: Article
Keywords: climate change, development, Eastern Antarctica, echinopluteus, pCO2 , sea urchin, temperature
Journal or Publication Title: Global Change Biology
Page Range: pp. 2264-2275
ISSN: 1354-1013
Identification Number - DOI: 10.1111/gcb.12190
Additional Information:

Copyright 2013 Blackwell Publishing Ltd

Date Deposited: 13 Aug 2013 00:02
Last Modified: 18 Nov 2014 04:53
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