Temperature modulates the response of the thermophilous sea urchinArbacia lixula early life stages to CO2-driven acidification

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Abstract

The increasing abundances of the thermophilous black sea urchin Arbacia lixula in the Mediterranean Seaare attributed to the Western Mediterranean warming. However, few data are available on the potentialimpact of this warming on A. lixula in combination with other global stressors such as ocean acidification.The aim of this study is to investigate the interactive effects of increased temperature and of decreasedpH on fertilization and early development of A. lixula. This was tested using a fully crossed design withfour temperatures (20, 24, 26 and 27 C) and two pH levels (pHNBS 8.2 and 7.9). Temperature and pH hadno significant effect on fertilization and larval survival (2d) for temperature <27 C. At 27 C, thefertilization success was very low (<1%) and all larvae died within 2d. Both temperature and pH hadeffects on the developmental dynamics. Temperature appeared to modulate the impact of decreasing pHon the % of larvae reaching the pluteus stage leading to a positive effect (faster growth compared to pH8.2) of low pH at 20 C, a neutral effect at 24 C and a negative effect (slower growth) at 26 C. Theseresults highlight the importance of considering a range of temperatures covering today and the futureenvironmental variability in any experiment aiming at studying the impact of ocean acidification
Original languageEnglish
Pages (from-to)70-77
Number of pages8
JournalMarine Environmental Research
Volume93
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Aquatic Science
  • Pollution

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