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Effects of Ocean Climate on Spatiotemporal Variation in Sea Urchin Settlement and Recruitment

Daniel K. Okamoto, Stephen Schroeter, Daniel C. Reed
doi: https://doi.org/10.1101/387282
Daniel K. Okamoto
1Department of Biological Science, Florida State University, Tallahassee, Florida 32303
2Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, CA 93106 USA
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  • For correspondence: dokamoto@bio.fsu.edu
Stephen Schroeter
3Marine Science Institute, University of California Santa Barbara, Santa Barbara, CA 93106 USA
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Daniel C. Reed
3Marine Science Institute, University of California Santa Barbara, Santa Barbara, CA 93106 USA
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Abstract

Sea urchins are voracious herbivores that influence the ecological structure and function of nearshore ecosystems throughout the world. Like many species that produce planktonic larvae, their recruitment is thought to be particularly sensitive to climatic fluctuations in temperature that directly or indirectly affect adult reproduction and larval transport and survival. Yet how climate alters sea urchin populations in space and time by modifying larval recruitment and year-class strength on the time-scales that regulate populations remains understudied. Using a, spatially replicated weekly-biweekly dataset spanning 27 years and 1100 km of coastline, we characterized seasonal, interannual, and spatial patterns of larval settlement of the purple sea urchin (Strongylocentrotus purpuratus). We show that large spatial differences in temporal patterns of larval settlement were associated with different responses to fluctuations in ocean temperature and climate. Importantly, we found a strong correlation between larval settlement and regional year class strength suggesting that such temporal and spatial variation in settlement plays an important role in controlling population dynamics. These results provide strong evidence over extensive temporal and spatial domains that climatic fluctuations shape broad-scale patterns of larval settlement and subsequent population structure of an important marine herbivore known to control the productivity, community state and provisioning services of marine ecosystems.

Footnotes

  • ↵† email: schroete{at}lifesci.ucsb.edu

  • ↵‡ email: dan.reed{at}lifesci.ucsb.edu

  • This version has been revised and resubmitted following peer review.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted January 25, 2020.
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Effects of Ocean Climate on Spatiotemporal Variation in Sea Urchin Settlement and Recruitment
Daniel K. Okamoto, Stephen Schroeter, Daniel C. Reed
bioRxiv 387282; doi: https://doi.org/10.1101/387282
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Effects of Ocean Climate on Spatiotemporal Variation in Sea Urchin Settlement and Recruitment
Daniel K. Okamoto, Stephen Schroeter, Daniel C. Reed
bioRxiv 387282; doi: https://doi.org/10.1101/387282

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