Effects of ocean warming and acidification on the energy budget of an excavating sponge

J.K.H. Fang, Christine Schonberg, M.A. Mello-Athayde, O. Hoegh-Guldberg, S.G. Dove

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Recent research efforts have demonstrated increased bioerosion rates under experimentally elevated partial pressures of seawater carbon dioxide (pCO2) with or without increased temperatures, which may lead to net erosion on coral reefs in the future. However, this conclusion clearly depends on the ability of the investigated bioeroding organisms to survive and grow in the warmer and more acidic future environments, which remains unexplored. The excavating sponge Cliona orientalis Thiele, is a widely distributed bioeroding organism and symbiotic with dinoflagellates of the genus Symbiodinium. Using C. orientalis, an energy budget model was developed to calculate amounts of carbon directed into metabolic maintenance and growth. This model was tested under a range of CO2 emission scenarios (temperature + pCO2) appropriate to an Austral early summer. Under a pre-industrial scenario, present day (control) scenario, or B1 future scenario (associated with reducing the rate of CO2 emissions over the next few decades), C. orientalis maintained a positive energy budget, where metabolic demand was likely satisfied by autotrophic carbon provided by Symbiodinium and heterotrophic carbon via filter-feeding, suggesting sustainability. Under B1, C. orientalis likely benefited by a greater supply of photosynthetic products from its symbionts, which increased by up to 56% per unit area, and displayed an improved condition with up to 52% increased surplus carbon available for growth. Under an A1FI future scenario (associated with 'business-as-usual' CO2 emissions) bleached C. orientalis experienced the highest metabolic demand, but carbon acquired was insufficient to maintain the sponge, as indicated by a negative energy budget. These metabolic considerations suggest that previous observations of increased bioerosion under A1FI by C. orientalis may not last through the height of future A1FI summers, and survival of individual sponges may be dependent on the energy reserves (biomass) they have accumulated through the rest of the year. © 2013 John Wiley & Sons Ltd.
Original languageEnglish
Pages (from-to)1043-1054
JournalGlobal Change Biology
Volume20
Issue number4
DOIs
Publication statusPublished - 2014

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Acidification
energy budget
sponge
acidification
Carbon
warming
carbon
ocean
bioerosion
Reefs
filter feeding
summer
symbiont
partial pressure
Seawater
Carbon Dioxide
Partial pressure
dinoflagellate
coral reef
Sustainable development

Cite this

Fang, J.K.H. ; Schonberg, Christine ; Mello-Athayde, M.A. ; Hoegh-Guldberg, O. ; Dove, S.G. / Effects of ocean warming and acidification on the energy budget of an excavating sponge. In: Global Change Biology. 2014 ; Vol. 20, No. 4. pp. 1043-1054.
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Effects of ocean warming and acidification on the energy budget of an excavating sponge. / Fang, J.K.H.; Schonberg, Christine; Mello-Athayde, M.A.; Hoegh-Guldberg, O.; Dove, S.G.

In: Global Change Biology, Vol. 20, No. 4, 2014, p. 1043-1054.

Research output: Contribution to journalArticle

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AU - Fang, J.K.H.

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AU - Mello-Athayde, M.A.

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AU - Dove, S.G.

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AB - Recent research efforts have demonstrated increased bioerosion rates under experimentally elevated partial pressures of seawater carbon dioxide (pCO2) with or without increased temperatures, which may lead to net erosion on coral reefs in the future. However, this conclusion clearly depends on the ability of the investigated bioeroding organisms to survive and grow in the warmer and more acidic future environments, which remains unexplored. The excavating sponge Cliona orientalis Thiele, is a widely distributed bioeroding organism and symbiotic with dinoflagellates of the genus Symbiodinium. Using C. orientalis, an energy budget model was developed to calculate amounts of carbon directed into metabolic maintenance and growth. This model was tested under a range of CO2 emission scenarios (temperature + pCO2) appropriate to an Austral early summer. Under a pre-industrial scenario, present day (control) scenario, or B1 future scenario (associated with reducing the rate of CO2 emissions over the next few decades), C. orientalis maintained a positive energy budget, where metabolic demand was likely satisfied by autotrophic carbon provided by Symbiodinium and heterotrophic carbon via filter-feeding, suggesting sustainability. Under B1, C. orientalis likely benefited by a greater supply of photosynthetic products from its symbionts, which increased by up to 56% per unit area, and displayed an improved condition with up to 52% increased surplus carbon available for growth. Under an A1FI future scenario (associated with 'business-as-usual' CO2 emissions) bleached C. orientalis experienced the highest metabolic demand, but carbon acquired was insufficient to maintain the sponge, as indicated by a negative energy budget. These metabolic considerations suggest that previous observations of increased bioerosion under A1FI by C. orientalis may not last through the height of future A1FI summers, and survival of individual sponges may be dependent on the energy reserves (biomass) they have accumulated through the rest of the year. © 2013 John Wiley & Sons Ltd.

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DO - 10.1111/gcb.12369

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JO - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

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