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• W2077767049 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 507:153-167 (2014) - DOI: https://doi.org/10.3354/meps10852 Complex ecological associations: competition and facilitation in a sponge–algal interaction Cole G. Easson1,5,*, Marc Slattery1,2,3, David M. Baker4, Deborah J. Gochfeld1,2 1Environmental Toxicology Research Program, University of Mississippi, University, MS 38677, USA 2National Center for Natural Products Research, University of Mississippi, University, MS 38677, USA 3Department of Pharmacognosy, University of Mississippi, University, MS 38677, USA 4The Swire Institute of Marine Science, School of Biological Sciences & Department of Earth Science, University of Hong Kong, Hong Kong, PR China 5Present address: Department of Biology, University of Alabama at Birmingham, 1300 University Blvd, Birmingham, AL 35294, USA *Corresponding author: cgeasson@uab.edu ABSTRACT: Over the past few decades, Caribbean coral reefs have undergone a phase shift from coral-dominated to algal-dominated communities due to several factors, including increased input of anthropogenic nutrients. With the decline in coral cover, sponges have also become more dominant members of Caribbean coral reef communities. Increased algal and sponge dominance on Caribbean reefs has led to an increase in the frequency of interaction between these 2 groups. This study used a factorial design to assess the independent and interactive effects of contact and elevated nutrient levels on 2 common members of these communities, the sponge Aplysina cauliformis, and the macroalga Microdictyon marinum. Algal contact had a significant negative physiological effect on A. cauliformis, affecting both the host sponge and its cyanobacterial symbionts. While elevated nutrient levels had some positive effects on the sponge photosymbionts, this only occurred in the absence of algal contact or a shading/abrasion control, and elevated nutrient levels had a negative effect on the sponge holobiont. In contrast, M. marinum responded positively to experimentally enhanced nutrient levels and to sponge contact under ambient nutrient regimes, but was not affected by sponge contact under elevated nutrient concentrations. Stable isotope enrichment experiments showed that the alga’s positive response to sponge contact was associated with nitrogen transfer from the sponge over the course of the experiment. Thus, while A. cauliformis facilitates increased productivity in M. marinum, algal contact competitively inhibits sponge condition. KEY WORDS: Aplysina cauliformis · Microdictyon marinum · Sponge · Nutrient enrichment · Stable isotope · Macroalga · Coral reef · Cyanobacteria · Symbiont · Caribbean Full text in pdf format PreviousNextCite this article as: Easson CG, Slattery M, Baker DM, Gochfeld DJ (2014) Complex ecological associations: competition and facilitation in a sponge–algal interaction. Mar Ecol Prog Ser 507:153-167. https://doi.org/10.3354/meps10852 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 507. Online publication date: July 17, 2014 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2014 Inter-Research." @default.
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• W2077767049 title "Complex ecological associations: competition and facilitation in a sponge–algal interaction" @default.
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