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Epizoic zoanthids reduce pumping in two Caribbean vase sponges

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Abstract

Sponges are common sessile benthic suspension feeders that play a critical role in carbon and nitrogen cycling within reef ecosystems via their filtration capabilities. Due to the contribution of sponges in benthic–pelagic coupling, it is critical to assess factors that may affect their role in the healthy function of coral reefs. Several factors can influence the rate at which an individual sponge pumps water, including body size, environmental conditions, mechanical blockage, and reduction of inhalant pores (ostia). Symbiotic zoanthid colonization is a common occurrence on Caribbean sponges, and the presence of zoanthids on the surface of a sponge may occlude or displace the inhalant ostia. We quantified pumping rates of the giant barrel sponge, Xestospongia muta (N = 22 uncolonized, 37 colonized) and the common vase sponge, Niphates digitalis (N = 21 uncolonized, 17 colonized), with and without zoanthid symbionts, Parazoanthus catenularis and Parazoanthus parasiticus, respectively. For X. muta, biovolume-normalized pumping rates of individuals colonized by zoanthids were approximately 75 % lower than those of uncolonized sponges. Moreover, colonization with zoanthids was related to a difference in morphology relative to uncolonized individuals: Colonized sponges exhibited an osculum area to biovolume ratio that was nearly 65 % less than uncolonized sponges. In contrast, the presence of zoanthids on N. digitalis resulted in only a marginal decrease in pumping rates and no detectable difference in morphology. The difference in zoanthid effects between X. muta and N. digitalis is likely due to the differences in wall thickness and architecture between the two species. The probable cause of reduced pumping in affected sponges is occupation of the sponge surface that leads to blockage or displacement of inhalant ostia. To partially test this hypothesis, zoanthid colonization on specimens of X. muta was simulated by wrapping sponges with plastic mesh of varying porosity. Mechanical blockage of ostia resulted in a 20–50 % reduction in pumping rates compared with controls.

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Acknowledgments

This study was funded by a Grant to CMF from the National Science Foundation (OCE-0751753). We thank the staff of the National Oceanic and Atmospheric Administration’s Aquarius Reef Base in Key Largo, Florida, and the crews of the R/V Walton Smith, R/V Cape Hatteras, and the R/V Seward Johnson for logistical support. Assistance in the field was provided by Kristen Jabanoski, Tse-Lynn Loh, and Steven McMurray. We are grateful to Dr. H. Lasker, University of Buffalo, for providing additional cruise time at Cross Harbor. Joseph Pawlik, Stuart Borrett, Steven McMurray, and John Carroll provided thoughtful comments on previous versions of this manuscript. Research in the Florida Keys National Marine Sanctuary was performed under permit FKNMS-2009-126-A1.

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  1. T. B. Lewis

    Present address: Biology Department, San Diego State University, 5500 Campanile Dr., San Diego, CA, 92182-4614, USA

Authors and Affiliations

  1. Department of Biology and Marine Biology, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC, 28403, USA

    T. B. Lewis & C. M. Finelli

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  1. T. B. Lewis
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  2. C. M. Finelli
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Correspondence to C. M. Finelli.

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Communicated by Handling Editor Brian Helmuth

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Lewis, T.B., Finelli, C.M. Epizoic zoanthids reduce pumping in two Caribbean vase sponges. Coral Reefs 34, 291–300 (2015). https://doi.org/10.1007/s00338-014-1226-2

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