Alkaline phosphatase activity of reef‐building corals

Godinot, Claire; Ferrier‐Pagés, Christine; Sikorski, S.; Grover, Renaud

doi:10.4319/lo.2013.58.1.0227

Cited by 26 publications

(40 citation statements)

References 29 publications

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“…Contrarily to what was shown for the uptake of dissolved inorganic nitrogen and phosphorus, which were not influenced by seawater acidification in S. pistillata (Godinot et al ), this study shows that the organic nutrient acquisition of that species was negatively affected under high

p_{{CO}_{2}}

, with a simultaneous decrease in the DFAA uptake rates, in the APA, and in the feeding rates, processes essential to fulfill the nitrogen and phosphorus needs of corals (Grover et al ; Godinot et al ). It has to be noticed that this latter effect was independent of the trophic status of the coral colonies.…”

Section: Discussionsupporting

confidence: 80%

Ocean acidification reduces feeding rates in the scleractinian coral Stylophora pistillata

et al. 2015

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A general decline in coral calcification has been observed in response to ocean acidification. It has recently been shown that heterotrophic feeding (the acquisition of organic nutrients) enables one massive coral species to maintain its calcification rates while exposed to ocean acidification but the consequences of higher seawater partial pressure of CO2 (pCO2) on coral feeding capacities themselves have never been investigated. Exposing long‐term acclimated starved and fed colonies of the major reef builder Stylophora pistillata to either ambient pHT (8.06 ± 0.05; 417 Pa pCO2) or low pHT (7.51 ± 0.06; 1697 Pa pCO2) showed that higher feeding rates can counterbalance the negative effects of seawater acidification on coral calcification. Indeed, relative to unfed corals under ambient pHT conditions, calcification rates in unfed corals decreased by 53.6% but remained constant in fed corals under high pCO2 conditions. Results also clearly show that acidification affects the feeding capacity and feeding effort of the branching coral S. pistillata. Organic nutrient acquisition was severely reduced under high pCO2, with a simultaneous decrease in the dissolved free amino acid uptake rates, the alkaline phosphatase activities, and the feeding rates on Artemia salina nauplii. Considering that all these processes are needed to fulfill the nutrient needs of the symbiotic association, on a long‐term basis, lower feeding rates will likely aggravate the already fragile physiological state of many corals under warmer, more acidic conditions.

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p_{{CO}_{2}}

Section: Discussionsupporting

confidence: 80%

Ocean acidification reduces feeding rates in the scleractinian coral Stylophora pistillata

et al. 2015

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“…However, APA is not always a good indicator of deficiency, because it also varies between symbiont clades and host species (Godinot et al. ). For the same symbiont clade, APA was for example, five times higher in colonies of the coral Pocillopora damicornis maintained at high DIP concentrations (0.7 μmol.L ‐1 P, N:P ratio of 1.28) than in much lower DIP concentrations (~0.05 μmol.L ‐1 P and an inorganic N:P ratio of 26; Godinot ).…”

Section: Uptake Of Phosphorus By the Symbiotic Associationmentioning

confidence: 99%

“…The recycling of 0.5 μmol.L ‐1 DOP into DIP via APA yields 6.1 ± 0.4 10 −3 μmol P·mg protein −1 ·h −1 if the whole amount becomes available to corals (Godinot et al. ). This amount corresponds to a daily contribution of 0.16 ± 0.02 μmol P·cm −2 ·d −1 , considering ~2 mg protein.cm ‐2 .…”

Section: Uptake Of Phosphorus By the Symbiotic Associationmentioning

confidence: 99%

“…AcPA was detected in free-living dinoflagellates, in host tissue, and in endosymbionts of corals (Jackson 1989, Annis and Cook 2002, Wiedenmann et al 2013) and tridacnid clams (Belda 1994). APA has been measured in both symbionts and host tissue of different scleractinian species (Jackson and Yellowlees 1990, Rands et al 1993, Annis and Cook 2002, Godinot et al 2013, Wiedenmann et al 2013. At natural concentrations of DOP (in oligotrophic waters), phosphate generated from the hydrolysis of DOP by coral APA ranged between 0.8 and 4.1 μmol P·mg protein −1 ·h −1 in the light, and between 0.5 to 2.0 μmol P·mg protein −1 ·h −1 in the dark.…”

Section: Uptake Of Dissolved Organic Phosphorus Dopmentioning

confidence: 99%

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Phosphorus metabolism of reef organisms with algal symbionts

Ferrier‐Pagés

Godinot

D’Angelo

et al. 2016

Ecological Monographs

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Phosphorus (P), an essential structural and functional component of all living organisms, is considered to be the ultimate limiting nutrient in marine ecosystems. To optimize its acquisition, marine species such as protozoa, sponges, foraminifera, clams, and reef corals, among others, have entered symbiotic relationships with algae, which recycle waste products of the animal host and transform dissolved inorganic nutrients into organic molecules, making them bioavailable to their host. Such associations provide a competitive edge in an environment where ambient nutrient availability is low. The aim of this review is to summarize the current knowledge on the P sources available to reef organisms with algal symbionts, to discuss the means by which P is taken up and stored within the symbiosis, and to assess the effects of eutrophication‐induced phosphate enrichment on the algal and host physiology. Finally, we give an overview of knowledge gaps and open questions that should be addressed to better understand the role of phosphorus in reef symbioses functioning.

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“…Nubbins were then, rinsed, and placed back into control culture conditions for 24 hours. The symbiont content was measured as previously described78.…”

Section: Methodsmentioning

confidence: 99%

The c-Jun N-terminal kinase prevents oxidative stress induced by UV and thermal stresses in corals and human cells

Courtial

Picco

Grover

et al. 2017

Sci Rep

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Coral reefs are of major ecological and socio-economic interest. They are threatened by global warming and natural pressures such as solar ultraviolet radiation. While great efforts have been made to understand the physiological response of corals to these stresses, the signalling pathways involved in the immediate cellular response exhibited by corals remain largely unknown. Here, we demonstrate that c-Jun N-terminal kinase (JNK) activation is involved in the early response of corals to thermal and UV stress. Furthermore, we found that JNK activity is required to repress stress-induced reactive oxygen species (ROS) accumulation in both the coral Stylophora pistillata and human skin cells. We also show that inhibiting JNK activation under stress conditions leads to ROS accumulation, subsequent coral bleaching and cell death. Taken together, our results suggest that an ancestral response, involving the JNK pathway, is remarkably conserved from corals to human, protecting cells from the adverse environmental effects.

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Alkaline phosphatase activity of reef‐building corals

Cited by 26 publications

References 29 publications

Ocean acidification reduces feeding rates in the scleractinian coral Stylophora pistillata

Ocean acidification reduces feeding rates in the scleractinian coral Stylophora pistillata

Phosphorus metabolism of reef organisms with algal symbionts

The c-Jun N-terminal kinase prevents oxidative stress induced by UV and thermal stresses in corals and human cells

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