Photoacclimation supports environmental tolerance of a sponge to turbid low-light conditions
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Changes to coral reefs are occurring worldwide, often resulting in declining environmental quality which can be in the form of higher sedimentation rates and increased turbidity. While environmental acclimation to turbid and low-light conditions has been extensively studied in corals, far less is known about other phototrophic reef invertebrates. The photosynthetic cyanobacteria containing sponge Lamellodysidea herbacea is one of the most abundant sponges in the Wakatobi Marine National Park (WMNP, Indonesia), and its abundance is greatest at highly disturbed, turbid sites. This study investigated photoacclimation of L. herbacea symbionts to turbid reef sites using in situ PAM fluorometry combined with shading and transplant experiments at environmental extremes of light availability for this species. We found in situ photoacclimation of L. herbacea to both shallow, clear, high-light environments and deep, turbid, low-light environments. Shading experiments provide some evidence that L. herbacea are dependent on nutrition from their photosymbionts as significant tissue loss was seen in shaded sponges. Symbionts within surviving shaded tissue showed evidence of photoacclimation. Lamellodysidea herbacea transplanted from high- to low-light conditions appeared to have photoacclimated within 5 d with no significant effect of the lowered light level on survival. This ability of L. herbacea to photoacclimate to rapid and extreme changes in light availability may be one of the factors contributing to their survival on more turbid reef sites in the WMNP. Our study highlights the ability of some sponge species to acclimate to changes in light levels as a result of increased turbidity.
KeywordsSponge Photophysiology Coral reef Phase shifts Turbidity Acclimation
This research was facilitated by a Victoria University of Wellington doctoral scholarship awarded to Andrew Biggerstaff. A research permit for this research was issued to Professor David Smith from the Indonesian Ministry of Research and Technology (RISTEK). We also thank Operation Wallacea for providing funding for travel and accommodation associated with the data collection and the staff and volunteers of Hoga Island Marine Research Station.
- Burke L, Reytar K, Spalding M, Perry A (2011) Reefs at risk revisited. World Resources Institute, Washington, DC, pp 3–9Google Scholar
- Campbell D, Hurry V, Clarke AK, Gustafsson P, Öquist G (1998) Chlorophyll fluorescence analysis of cyanobacterial photosynthesis and acclimation. Microbiol Mol Biol R 62:667–683Google Scholar
- Clifton J, Unsworth RKF (2010) Introduction to the Wakatobi National Park, Chapter 1. In: Clifton J, Unsworth RKF, Smith DJ (eds) Marine Conservation and Research in the Coral Triangle: The Wakatobi National Park. Nova Publishers, New York, pp 1–9Google Scholar
- Cook SD, Bergquist PR (2002) Family Dysideidae Gray, 1867. In: Hooper JNA, van Soest RWM (eds) Systema porifera. A guide to the classification of sponges. Kluwer Academic/Plenum, New York, pp 1061–1066Google Scholar
- Hoegh-Guldberg O, Mumby PJ, Hooten AJ, Steneck RS, Greenfield P, Gomez E, Harvell CD, Sale PF, Edwards AJ, Caldeira K, Knowlton N, Eakin CM, Iglesias-Prieto R, Muthiga N, Bradbury RH, Dubi A, Hatsiolos ME (2007) Coral reefs under rapid climate change and ocean acidification. Science 318:1737–1742CrossRefPubMedGoogle Scholar
- Hooper JNA, Levi C (1994) Biogeography of Indo-west Pacific sponges: Microcionidae, Raspailiidae, Axinellidae. In: Braekman JC, van Kampen TMG, van Soest RWG (eds) Sponges in time and space. Balkema, Rotterdam, pp 265–271Google Scholar
- Hughes TP, Baird AH, Bellwood DR, Card M, Connolly SR, Folke C, Grosberg R, Hoegh-Guldberg O, Jackson JBC, Kleypas J, Lough JM, Marshall P, Nystrom M, Palumbi SR, Pandolfi JM, Rosen B, Roughgarden J (2003) Climate change, human impacts, and the resilience of coral reefs. Science 301:929–933CrossRefPubMedGoogle Scholar
- Powell AL (2013) The impacts of fish predation and habitat degradation on Indo-Pacific sponge assemblages. PhD thesis, Victoria University of Wellington, New ZealandGoogle Scholar