Lipids and stable carbon isotopes in two species of Hawaiian corals, Porites compressa and Montipora verrucosa, following a bleaching event

Grottoli, Andréa G.; Rodrigues, Lisa J.; Juárez, Carlos Arturo Noyola

doi:10.1007/s00227-004-1337-3

Cited by 261 publications

(247 citation statements)

References 77 publications

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“…Hypothesis 1: d 13 C depletion upon the onset of compression bands Isotopic profiles across compression bands coincident with the 1998 bleaching event did not consistently show depletions in d 13 C, contrary to past studies (e.g., Porter et al 1989;Carriquiry et al 1994;Suzuki et al 2003;Grottoli et al 2004;Rodrigues and Grottoli 2006). Both enrichment and depletion of skeletal d 13 C occurred at the onset of compression bands in the four cores studied here (Fig.…”

Section: Long-term Trendscontrasting

confidence: 88%

“…Inconsistent reports of the d 13 C response to bleaching across genera suggest that species-specific responses may also explain why skeletal d 13 C depletions are not consistently observed (e.g., Porites, Montipora; Porter et al 1989;Suzuki et al 2003;Grottoli et al 2004;Rodrigues and Grottoli 2006).…”

Section: Long-term Trendsmentioning

confidence: 99%

“…Indeed, depletion of d 13 C across known bleaching events has been observed in multiple species such as Montastraea annularis (Porter et al 1989), Porites spp. (Suzuki et al 2003), Montipora verrucosa and Porites compressa (Grottoli et al 2004), and Montipora capitata .…”

Section: Introductionmentioning

confidence: 99%

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Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata

et al. 2010

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Within boulder forming corals, fixation of dissolved inorganic carbon is performed by symbiotic dinoflagellates within the coral tissue and, to a lesser extent, endolithic algae within the coral skeleton. Endolithic algae produce distinctive green bands in the coral skeleton, and their origin may be related to periods of coral bleaching due to complete loss of dinoflagellate symbionts or ''paling'' in which symbiont populations are patchily reduced in coral tissue. Stable carbon isotopes were analyzed in coral skeletons across a known bleaching event and 12 blooms of endolithic algae to determine whether either of these types of changes in photosynthesis had a clear isotopic signature. Stable carbon isotopes tended to be enriched in the coral skeleton during the initiation of endolith blooms, consistent with enhanced photosynthesis by endoliths. In contrast, there were no consistent d 13 C patterns directly associated with bleaching, suggesting that there is no unique isotopic signature of bleaching. On the other hand, isotopic values after bleaching were lighter 92% of the time when compared to the bleaching interval. This marked drop in skeletal d 13 C may reflect increased kinetic fractionation and slow symbiont recolonization for several years after bleaching.

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Section: Long-term Trendscontrasting

confidence: 88%

Section: Long-term Trendsmentioning

confidence: 99%

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Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata

et al. 2010

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“…In whole coral analyses, total lipid content generally decreases in response to thermal stress. Grottoli et al (2004) observed a decrease in lipid abundance in bleached Porites compressa corals, but no change in Montipora verrucosa. Bachok et al (2006) observed a marked decrease in both total lipid concentration and the relative fatty acid content in bleached Pavona frondifera corals compared to healthy specimens.…”

Section: Discussionmentioning

confidence: 77%

Lipid biomarkers in Symbiodinium dinoflagellates: new indicators of thermal stress

et al. 2013

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Lipid content and fatty acid profiles of corals and their dinoflagellate endosymbionts are known to vary in response to high temperature stress. To better understand the heat stress response in these symbionts, we investigated cultures of Symbiodinium goreauii type C1 and Symbiodinium clade subtype D1 grown under a range of temperatures and durations. The predominant lipids produced by Symbiodinium are palmitic (C16) and stearic (C18) saturated fatty acids and their unsaturated analogs, docosahexaenoic (C22:6, n-3) polyunsaturated fatty acid (PUFA), and a variety of sterols. The relative amount of unsaturated acids within the C18 fatty acids in Symbiodinium tissue decreases in response to thermal stress. Prolonged exposure to high temperature also causes a decrease in abundance of fatty acids relative to sterols. These shifts in fatty acids and sterols are common to both types C1 and D1, but the apparent thermal threshold of lipid changes is lower for type C1. This work indicates that ratios among free fatty acids and sterols in Symbiodinium can be used as sensitive indicators of thermal stress.If the Symbdionium lipid stress response is unchanged in hospite, the algal heat stress biomarkers we have identified could be measured to detect thermal stress within the coral holobiont.. These results provide new insights into the potential role of lipids in the overall Symbiodinium thermal stress response.

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“…Many cnidarian taxa are rich in dietary lipids, including sterols, wax esters and free fatty acids (Fukuda and Naganuma, 2001;Hamoutene et al, 2008). Shallow reef-building corals often have extremely high lipid concentrations, although a substantial proportion of these lipids are derived from their dinoflagellate symbionts (Grottoli et al, 2004;Harland et al, 1993;Stimson, 1987). It is likely that fatty acids and/or other dietary lipids are substrates in N. vectensis for Hsd17b4 and possibly Hsd17b8.…”

Section: Discussionmentioning

confidence: 99%

Steroid metabolism in cnidarians: Insights from Nematostella vectensis

Tarrant

Reitzel

Blomquist

et al. 2009

Molecular and Cellular Endocrinology

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Cnidarians occupy a key evolutionary position as a sister group to bilaterian animals. While cnidarians contain a diverse complement of steroids, sterols, and other lipid metabolites, relatively little is known of the endogenous steroid metabolism or function in cnidarian tissues. Incubations of cnidarian tissues with steroid substrates have indicated the presence of steroid metabolizing enzymes, particularly enzymes with 17β-hydroxysteroid dehydrogenase (17β-HSD) activity. Through analysis of the genome of the starlet sea anemone, Nematostella vectensis, we identified a suite of genes in the short chain dehydrogenase/reductase (SDR) superfamily including homologs of genes that metabolize steroids in other animals. A more detailed analysis of Hsd17b4 revealed complex evolutionary relationships, apparent intron loss in several taxa, and predominantly adult expression in N. vectensis. Due to its ease of culture and available molecular tools N. vectensis is an excellent model for investigation of cnidarian steroid metabolism and gene function. KeywordsEvolution, hydroxysteroid dehydrogenase, short chain dehydrogenase/reductase Abbreviations CYP HSD AKR 3

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Lipids and stable carbon isotopes in two species of Hawaiian corals, Porites compressa and Montipora verrucosa, following a bleaching event

Cited by 261 publications

References 77 publications

Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata

Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata

Lipid biomarkers in Symbiodinium dinoflagellates: new indicators of thermal stress

Steroid metabolism in cnidarians: Insights from Nematostella vectensis

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