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Seedlings of P. oceanica established in the Gulf of Ventilegne (Corsica, France). A patch of seedlings established in 2004 on a sandy substrate patch and marked (arrows) in July 2005 (A) and the same patch photographed after 11 years in July 2016 (B). Newly established seedlings (2016s cohort) found on sandy substrate very close to old seedlings (2004s cohort) (C), on rocky pools (D), and on the aboral surface of sea urchins Paracentrotus lividus (E).
