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Marine Ecology Progress Series

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MEPS 667:43-60 (2021)  -  DOI: https://doi.org/10.3354/meps13706

Effects of temperature, salinity, and depth on Symbiodiniaceae lineages hosted by Palythoa tuberculosa near a river mouth

Hin Boo Wee1,2,*, Yui Kobayashi3, James Davis Reimer1,3,4

1Graduate School of Science and Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
2Institute of Climate Change, Universiti Kebangsaan Malaysia (UKM), Bangi 43600, Selangor, Malaysia
3Department of Chemistry, Biology, and Marine Science, Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
4Tropical Biosphere Research Center, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
*Corresponding author:

ABSTRACT: The diversity of symbiotic dinoflagellate Symbiodiniaceae hosted by anthozoans is known to be driven by the environment where the hosts are found. This study examined how environmental variations (<1 to 100s m) can influence the diversity of Symbiodiniaceae within the zoantharian Palythoa tuberculosa. We monitored the dominant Symbiodiniaceae lineages within tagged P. tuberculosa colonies near the Hija River mouth and adjacent coastal reefs at Mizugama, Okinawa, Japan, between July 2016 and April 2018. Seven sites were chosen based on depth and distance from the river mouth, with 5 tagged colonies at each site. Water parameters of tidal pools (TPs) at the river mouth, especially temperature, were significantly different from other sites. Surprisingly, P. tuberculosa colonies at TPs were more resilient to bleaching during summers compared to colonies at other shallow sites. We observed different Cladocopium psbAncr lineages hosted by the tagged P. tuberculosa, with TPs colonies usually hosting one Cladocopium lineage (designated as lineage 4). Colonies from the deep sites and other shallow sites hosted mostly Cladocopium lineages 1 (generalist) and 2 (riverine specialist). Throughout the study period, the shallow colonies (included TPs) recorded higher rates of switching dominant Cladocopium lineages (mostly to lineage 1), whereas most deep colonies did not switch their dominant Cladocopium lineages. Our results show that Cladocopium lineage 1, previously reported as a generalist lineage in terms of environmental parameters, could also be an opportunist lineage during periods of host stress. Our study confirms that Cladocopium lineage flexibility likely helps the resilience of P. tuberculosa in such variable environments.


KEY WORDS: Okinawa · Zoantharian · Anthozoa · Bleaching · Zooxanthellae


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Cite this article as: Wee HB, Kobayashi Y, Reimer JD (2021) Effects of temperature, salinity, and depth on Symbiodiniaceae lineages hosted by Palythoa tuberculosa near a river mouth. Mar Ecol Prog Ser 667:43-60. https://doi.org/10.3354/meps13706

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