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Cidaroids spines facing ocean acidification
Dery, A.; Tran, P.D.; Compère, P.; Dubois, P. (2018). Cidaroids spines facing ocean acidification. Mar. Environ. Res. 138: 9-18. https://hdl.handle.net/10.1016/j.marenvres.2018.03.012
In: Marine Environmental Research. Applied Science Publishers: Barking. ISSN 0141-1136; e-ISSN 1879-0291, more
Peer reviewed article  

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Keywords
    Euechinoidea [WoRMS]
    Marine
Author keywords
    Ocean acidification; Benthos; Sea urchin; Spine; Minerals; Magnesiumconcentration; Epibionts

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Abstract
    When facing seawater undersaturated towards calcium carbonates, spines of classical sea urchins (euechinoids) show traces of corrosion although they are covered by an epidermis, Cidaroids (a sister Glade of euechinoids) are provided with mature spines devoid of epidermis, which makes them, at first sight, more sensitive to dissolution when facing undersaturated seawater. A recent study showed that spines of a tropical cidaroid are resistant to dissolution due to the high density and the low magnesium concentration of the peculiar external spine layer, the cortex. The biofilm and epibionts covering the spines was also suggested to take part in the spine protection. Here, we investigate the protective role of these factors in different cidaroid species from a broad range of latitude, temperature and depth. The high density of the cortical layer and the cover of biofilm and epibionts were confirmed as key protection against dissolution. The low magnesium concentration of cidaroid spines compared to that of euechinoid ones makes them less soluble in general.

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