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Author Cacciapaglia, C.; van Woesik, R.
Title Climate-change refugia: shading reef corals by turbidity Type Journal Article
Year 2016 Publication Global Change Biology Abbreviated Journal Glob Change Biol
Volume 22 Issue 3 Pages 1145-1154
Keywords climate; corals; irradiance; refuges; temperature; turbidity
Abstract Coral reefs have recently experienced an unprecedented decline as the world's oceans continue to warm. Yet global climate models reveal a heterogeneously warming ocean, which has initiated a search for refuges, where corals may survive in the near future. We hypothesized that some turbid nearshore environments may act as climate-change refuges, shading corals from the harmful interaction between high sea-surface temperatures and high irradiance. We took a hierarchical Bayesian approach to determine the expected distribution of 12 coral species in the Indian and Pacific Oceans, between the latitudes 37°N and 37°S, under representative concentration pathway 8.5 (W m&#8722;2) by 2100. The turbid nearshore refuges identified in this study were located between latitudes 20&#65533;30°N and 15&#65533;25°S, where there was a strong coupling between turbidity and tidal fluctuations. Our model predicts that turbidity will mitigate high temperature bleaching for 9% of shallow reef habitat (to 30 m depth) &#65533; habitat that was previously considered inhospitable under ocean warming. Our model also predicted that turbidity will protect some coral species more than others from climate-change-associated thermal stress. We also identified locations where consistently high turbidity will likely reduce irradiance to <250 &#956;mol m&#8722;2 s&#8722;1, and predict that 16% of reef-coral habitat &#8804;30 m will preclude coral growth and reef development. Thus, protecting the turbid nearshore refuges identified in this study, particularly in the northwestern Hawaiian Islands, the northern Philippines, the Ryukyu Islands (Japan), eastern Vietnam, western and eastern Australia, New Caledonia, the northern Red Sea, and the Arabian Gulf, should become part of a judicious global strategy for reef-coral persistence under climate change.
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ISSN 1354-1013 ISBN Medium
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Call Number FCI @ refbase @ Serial 847
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Author Dutra, E.; Koch, M.; Peach, K.; Manfrino, C.
Title Tropical crustose coralline algal individual and community responses to elevated pCO(2) under high and low irradiance Type Journal Article
Year 2016 Publication ICES Journal of Marine Science: Journal du Conseil Abbreviated Journal ICES J. Mar. Sci.
Volume 73 Issue 3 Pages 803-813
Keywords CCA; coral reef; irradiance; Little Cayman Island; macroalgae; ocean acidification
Abstract Crustose coralline algae (CCA) cement reefs and create important habitat and settling sites for reef organisms. The susceptibility of CCA to increasing ocean pCO(2) and declining pH or ocean acidification (OA) is a growing concern. Although CCA are autotrophs, there has been little focus on the interaction of elevated pCO(2) and irradiance. We examined elevated pCO(2) effects on individual CCA and macroalgal benthic communities at high and low irradiance (205 13 mol photons m(-2) s(-1)) in an aquaria experiment (35 d, June August 2014) on Little Cayman Island, Caribbean. A dominant Cayman reef wall CCA (Peyssonnelia sp.) in its adult lobed form and individual CCA recruits were used as experimental units. Changes in CCA, fleshy macroalgae (branching and turfs), and microalgae (including microbial biofilm) per cent cover and frequency were examined on macroalgal communities that settled onto plates from the reef. Reef diel cycles of pCO(2) and pH were simulated using seawater inflow from a back reef. Although CO2 enrichment to year 2100 levels resulted in 1087 mu atm pCO(2) in the elevated pCO(2) treatment, CaCO3 saturation states remained high (Omega(cal) >= 2.7). Under these conditions, elevated pCO(2) had no effect on Peyssonnelia sp. calcification rates or survival regardless of irradiance. Individual CCA surface area on the bottom of settling plates was lower under elevated pCO(2), but per cent cover or frequency within the community was unchanged. In contrast, there was a strong and consistent community assemblage response to irradiance. Microalgae increased at high irradiance and CCA increased under low irradiance with no significant pCO(2) interaction. Based on this short-term experiment, tropical macroalgal communities are unlikely to shift at pCO(2) levels predicted for year 2100 under high or low irradiance. Rather, irradiance and other factors that promote microalgae are likely to be strong drivers of tropical benthic algal community structure under climate change.
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ISSN 1054-3139 ISBN Medium
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Notes Approved no
Call Number FCI @ refbase @ Serial 964
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Author Pau, S; Okamoto, DK; Calderon, O; Wright, SJ
Title Long-term increases in tropical flowering activity across growth forms in response to rising CO2 and climate change Type Journal Article
Year 2018 Publication Global Change Biology Abbreviated Journal
Volume 24 Issue 5 Pages 2105-2116
Keywords climate change; CO2 fertilization; El Niño; lifeforms; reproduction; solar irradiance; solar radiation
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Call Number FCI @ refbase @ Serial 1811
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Author Wall, C.B.; Mason, R.A.B.; Ellis, W.R.; Cunning, R.; Gates, R.D.
Title Elevated pCO(2) affects tissue biomass composition, but not calcification, in a reef coral under two light regimes Type Journal Article
Year 2017 Publication Royal Society Open Science Abbreviated Journal R. Soc. Open Sci.
Volume 4 Issue 11 Pages 170683
Keywords ocean acidification; irradiance; scleractinian; biomass; energy reserves
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN 2054-5703 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number FCI @ refbase @ Serial 1805
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