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Mar Pollut Bull. 2019 Apr;141:70-78. doi: 10.1016/j.marpolbul.2019.02.018. Epub 2019 Feb 18.

Effects of ocean warming and acidification on fertilization success and early larval development in the green sea urchin Lytechinus variegatus.

Author information

1
Department of Marine and Environmental Science, Halmos College of Natural Sciences and Oceanography, Nova Southeastern University, Dania Beach, FL, USA.
2
Department of Marine and Environmental Science, Halmos College of Natural Sciences and Oceanography, Nova Southeastern University, Dania Beach, FL, USA; Department of Biology and Marine Biology, University of North Carolina Wilmington, Center for Marine Science, USA.
3
Department of Marine and Environmental Science, Halmos College of Natural Sciences and Oceanography, Nova Southeastern University, Dania Beach, FL, USA. Electronic address: jfigueiredo@nova.edu.

Abstract

Ocean acidification and warming are predicted to affect the early life of many marine organisms, but their effects can be synergistic or antagonistic. This study assessed the combined effects of near-future (2100) ocean acidification (pH 7.8) and warming (+3 °C) on the fertilization, larval development and growth of the green sea urchin, Lytechinus variegatus, common in tropical reefs of Florida and the Caribbean. Acidification had no effect on fertilization, but delayed larval development, stunted growth, and increased asymmetry. Warming decreased fertilization success when the sperm:egg ratio was higher (1847:1), accelerated larval development, but had no effect on growth. When exposed to both acidification and warming, fertilization rates decreased, larval development accelerated (due to increased respiration/metabolism), but larvae were smaller and more asymmetric, meaning acidification and warming had additive effects. Thus, climate change is expected to decrease the abundance of this important herbivore, exacerbating macroalgal growth and dominance on coral reefs.

KEYWORDS:

Acidification; Climate change; Echinoids; Fertilization; Larval development; Larval growth

PMID:
30955782
DOI:
10.1016/j.marpolbul.2019.02.018
[Indexed for MEDLINE]

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