Nitrate increases zooxanthellae population density and reduces skeletogenesis in corals

Marubini, Francesca; Davies, Phil

doi:10.1007/bf00942117

Cited by 271 publications

(239 citation statements)

References 33 publications

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“…For instance, Symbiodinium densities in P. damicornis declined~10-20% after 2 weeks at 30°C in Panama (ambient +2°C) (Glynn and D'Croz, 1990), and in P. damicornis from Australia, they declined~15-25% after 2 weeks at 29°C (ambient +3°C) (Ulstrup et al, 2006). Against this backdrop, it is surprising that the collateral effects in the present study of exposure to fluctuating temperatures and 30°C were small, and included calcification rates that remained within the range reported for congeners (Marubini and Davies, 1996;Edmunds, 2005, P.J. Edmunds unpublished data).…”

Section: Discussionsupporting

confidence: 41%

The physiological response of reef corals to diel fluctuations in seawater temperature

Putnam

Edmunds

2011

Journal of Experimental Marine Biology and Ecology

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An opportunity to explore the effects of fluctuating temperatures on tropical scleractinian corals arose when diurnal warming (as large as 4.7°C) was detected over the rich coral communities found within the back reef of Moorea, French Polynesia. In April and May 2007, experiments were completed to determine the effects of fluctuating temperature on Pocillopora meandrina and Porites rus, and consecutive trials were used to expose them for 13 days to 26°C, 28°C (ambient conditions), 30°C, or a fluctuating treatment ranging from 26 to 30°C over 24 h. The multivariate response was assessed using maximum dark-adapted quantum yield of PSII (F V /F M ), Symbiodinium density, chlorophyll-a content, and calcification. In trial 1, multivariate physiology of both species was significantly affected by treatments, with the fluctuating temperature resulting in a 17-45% decline in Symbiodinium density (relative to the ambient) matching that occurring at a constant 30°C; F V /F M , chlorophyll-a content, and calcification, did not differ between the fluctuating and the steady treatments. In contrast, in trial 2 that utilized corals collected two weeks after those used in trial 1, the corals were unaffected by the treatments, likely due to an environment × trial interaction caused by seasonal declines in Symbiodinium density. Together, these results demonstrate that short transgressions to ecologically relevant high and low temperatures can elicit a potentially detrimental response equivalent to that occurring upon exposure to a constant high temperature. The dissimilar responses among dependent variables and consecutive trials underscore the importance of temporal replication and multivariate approaches in coral ecophysiology. It is likely that recent history has a stronger effect on the response of corals to treatments than is currently recognized.

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Section: Discussionsupporting

confidence: 41%

The physiological response of reef corals to diel fluctuations in seawater temperature

Putnam

Edmunds

2011

Journal of Experimental Marine Biology and Ecology

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“…However, coral growth is also indirectly affected by changes in irradiance due to variable turbidity and nutrient conditions (e.g. Marubini and Davies 1996). On the Great Barrier Reef, the growth parameters of massive Porites vary along cross-shelf gradients.…”

Section: Coral Growthmentioning

confidence: 99%

Bioindicators of changes in water quality on coral reefs: review and recommendations for monitoring programmes

2009

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Effective environmental management requires monitoring programmes that provide specific links between changes in environmental conditions and ecosystem health. This article reviews the suitability of a range of bioindicators for use in monitoring programmes that link changes in water quality to changes in the condition of coral-reef ecosystems. From the literature, 21 candidate bioindicators were identified, whose responses to changes in water quality varied spatially and temporally; responses ranged from rapid (hours) changes within individual corals to long-term (years) changes in community composition. From this list, the most suitable bioindicators were identified by determining whether responses were (i) specific, (ii) monotonic, (iii) variable, (iv) practical and (v) ecologically relevant to management goals. For long-term monitoring programmes that aim to quantify the effects of chronic changes in water quality, 11 bioindicators were selected: symbiont photophysiology, colony brightness, tissue thickness and surface rugosity of massive corals, skeletal elemental and isotopic composition, abundance of macro-bioeroders, micro-and meiobenthic organisms such as foraminifera, coral recruitment, macroalgal cover, taxonomic richness of corals and the maximal depth of coralreef development. For short-term monitoring programmes, or environmental impact assessments that aim to quantify the effects of acute changes in water quality, a subset of seven of these bioindicators were selected, including partial mortality. Their choice will depend on the specific objectives and the timeframe available for each monitoring programme. An assessment framework is presented to assist in the selection of bioindicators to quantify the effects of changing water quality on coral-reef ecosystems.

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“…This increase in CO 2 and HCO 3 -may in fact stimulate photosynthesis by zooxanthellae, but it is accompanied by a decrease rather than an increase in calcification [Langdon and Atkinson, 2005]. This may be due to competition between zooxanthellae and the host for the same internal pool of dissolved inorganic carbon [Marubini and Davies, 1996;Cruz-Pinon et al, 2003]. …”

Section: Natural Variability Of the Carbonate System On Coral Reefsmentioning

confidence: 99%

Coral reefs and changing seawater carbonate chemistry

Kleypas¹,

Langdon²

2006

Coral Reefs and Climate Change: Science and Management

151

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Seawater carbonate chemistry of the mixed layer of the oceans is changing rapidly in response to increases in atmospheric CO 2 . The formation and dissolution of calcium carbonate is now known to be strongly affected by these changes, but many questions remain about other controls on biocalcification and inorganic cementation that confound our attempts to make accurate predictions about the effects on both coral reef organisms and reefs themselves. This chapter overviews the current knowledge of the relationship between seawater carbonate chemistry and coral reef calcification, identifies the hurdles in our understanding of the two, and presents a strategy for overcoming those hurdles.

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Nitrate increases zooxanthellae population density and reduces skeletogenesis in corals

Cited by 271 publications

References 33 publications

The physiological response of reef corals to diel fluctuations in seawater temperature

The physiological response of reef corals to diel fluctuations in seawater temperature

Bioindicators of changes in water quality on coral reefs: review and recommendations for monitoring programmes

Coral reefs and changing seawater carbonate chemistry

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