Do fluctuating temperature environments elevate coral thermal tolerance?

Oliver, Thomas; Palumbi, Stephen R.

doi:10.1007/s00338-011-0721-y

Cited by 421 publications

(445 citation statements)

References 62 publications

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“…4). Our results are at odds with previous studies that have found higher thermal tolerance of organisms when exposed to greater magnitudes of fluctuating temperatures (Schaefer and Ryan, 2006;Oliver and Palumbi, 2011;Kern et al, 2015;Giomi et al, 2016). Temperature tolerance was only increased with acclimation to unpredictable heating regimes in one trial of the unpredictable treatments, but only in comparison to the predictable low and predictable high treatments.…”

Section: Discussioncontrasting

confidence: 99%

“…This phenomenon, known as heat hardening (Bowler, 2005), is a very important inducible stress tolerance mechanism in many organisms, both terrestrial and aquatic, inhabiting variable environments (Maness and Hutchinson, 1980;Rutledge et al, 1987;Middlebrook et al, 2008;Bilyk et al, 2012). Previous studies have shown fluctuating thermal environments increase thermal tolerance (Feldmeth et al, 1974;Otto, 1974;Threader and Houston, 1983;Woiwode and Adelman, 1992;Schaefer and Ryan, 2006;Oliver and Palumbi, 2011;Manenti et al, 2014;Kern et al, 2015), with intertidal species exposed to tidal cycle fluctuations being more stress-tolerant than those that are exposed to constant temperatures (Tomanek and Sanford, 2003;Podrabsky and Somero, 2004;Todgham et al, 2006;Giomi et al, 2016). Taken together, these studies suggest that the thermal physiology of intertidal organisms is likely modulated by the natural variability inherent with the ebb and flow of tides.…”

Section: Introductionmentioning

confidence: 99%

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The role of stochastic thermal environments in modulating the thermal physiology of an intertidal limpet, Lottia digitalis

Drake

Miller

Todgham

2017

Journal of Experimental Biology

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Much of our understanding of the thermal physiology of intertidal organisms comes from experiments with animals acclimated under constant conditions and exposed to a single heat stress. In nature, however, the thermal environment is more complex. Aerial exposure and the unpredictable nature of thermal stress during low tides may be critical factors in defining the thermal physiology of intertidal organisms. In the fingered limpet, Lottia digitalis, we investigated whether upper temperature tolerance and thermal sensitivity were influenced by the pattern of fluctuation with which thermal stress was applied. Specifically, we examined whether there was a differential response (measured as cardiac performance) to repeated heat stress of a constant and predictable magnitude compared with heat stress applied in a stochastic and unpredictable nature. We also investigated differences in cellular metabolism and damage following immersion for insights into biochemical mechanisms of tolerance. Upper temperature tolerance increased with aerial exposure, but no significant differences were found between predictable treatments of varying magnitudes (13°C versus 24°C versus 32°C). Significant differences in thermal tolerance were found between unpredictable trials with different heating patterns. There were no significant differences among treatments in basal citrate synthase activity, glycogen content, oxidative stress or antioxidants. Our results suggest that aerial exposure and recent thermal history, paired with relief from high low-tide temperatures, are important factors modulating the capacity of limpets to deal with thermal stress.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The role of stochastic thermal environments in modulating the thermal physiology of an intertidal limpet, Lottia digitalis

Drake

Miller

Todgham

2017

Journal of Experimental Biology

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“…These pools are approximately 500 m apart and are characterized by varying degrees of daily fluctuations in a suite of environmental variables (for example, temperature, flow, salinity) described in detail elsewhere (Smith et al, 2007(Smith et al, , 2008Barshis et al, 2010;Oliver and Palumbi, 2011). The magnitude of the environmental fluctuations correlate with the amount of open ocean admixture, providing variable environmental conditions over short distances, while presumably maintaining comparable access to pools of microbial immigrants.…”

Section: Methodsmentioning

confidence: 99%

“…For example, in both field observations and laboratory experiments, corals hosting specific members of clade D Symbiodinium have been shown to be more resistant to warmer waters and less prone to bleaching than corals hosting common members of clade C (Rowan, 2004;Berkelmans and Van Oppen, 2006). Acroporid corals are known to associate with multiple genetically distinct Symbiodinium types, including heatresistant members of clade D (Baker, 2003;Oliver and Palumbi, 2011).…”

Section: Introductionmentioning

confidence: 99%

Coral-associated marine fungi form novel lineages and heterogeneous assemblages

Amend

Barshis²,

Oliver³

2011

The ISME Journal

139

100

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Coral stress tolerance is intricately tied to the animal's association with microbial symbionts. The most well-known of these symbioses is that between corals and their dinoflagellate photobionts (Symbiodinium spp.), whose genotype indirectly affects whether a coral can survive cyclical and anthropogenic warming events. Fungi comprise a lesser-known coral symbiotic community whose taxonomy, stability and function is largely un-examined. To assess how fungal communities inside a coral host correlate with water temperature and the genotype of co-occurring Symbiodinium, we sampled Acropora hyacinthus coral colonies from adjacent natural pools with different water temperatures and Symbiodinium identities. Phylogenetic analysis of coral-associated fungal ribosomal DNA amplicons showed a high diversity of Basidiomycetes and Ascomycetes, including several clades separated from known fungal taxa by long and well-supported branches. Community similarity did not correlate with any measured variables, and total fungal community composition was highly variable among A. hyacinthus coral colonies. Colonies in the warmer pool contained more phylogenetically diverse fungal communities than the colder pool and contained statistically significant 'indicator' species. Four taxa were present in all coral colonies sampled, and may represent obligate associates. Messenger RNA sequenced from a subset of these same colonies contained an abundance of transcripts involved in metabolism of complex biological molecules. Coincidence between the taxonomic diversity found in the DNA and RNA analysis indicates a metabolically active and diverse resident marine fungal community.

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“…For example, exposure of the corals Pocillopora damicornis and Porites rus to diurnally varying temperatures reduces their Symbiodinium content and dark-adapted quantum yield of PSII more than exposure to steady temperature perturbations similar in magnitude to those at the extremes of the diurnal treatment [26]. Similarly, exposure in tidal pools of Acropora hyacinthus to diurnally varying temperature increases their resistance to elevated thermal stress compared with corals in more homogeneous conditions [25]. Together, these results suggest that corals might respond to ecologically relevant natural oscillations in pCO 2 in ways differing from those recorded under steady-state conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of diurnally oscillatingpCO₂on the calcification and survival of coral recruits

et al. 2012

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Manipulative studies have demonstrated that ocean acidification (OA) is a threat to coral reefs, yet no experiments have employed diurnal variations in pCO 2 that are ecologically relevant to many shallow reefs. Two experiments were conducted to test the response of coral recruits (less than 6 days old) to diurnally oscillating pCO 2 ; one exposing recruits for 3 days to ambient (440 matm), high (663 matm) and diurnally oscillating pCO 2 on a natural phase (420 -596 matm), and another exposing recruits for 6 days to ambient (456 matm), high (837 matm) and diurnally oscillating pCO 2 on either a natural or a reverse phase (448 -845 matm). In experiment I, recruits exposed to natural-phased diurnally oscillating pCO 2 grew 6-19% larger than those in ambient or high pCO 2 . In experiment II, recruits in both high and natural-phased diurnally oscillating pCO 2 grew 16 per cent larger than those at ambient pCO 2 , and this was accompanied by 13 -18% higher survivorship; the stimulatory effect on growth of oscillatory pCO 2 was diminished by administering high pCO 2 during the day (i.e. reverse-phased). These results demonstrate that coral recruits can benefit from ecologically relevant fluctuations in pCO 2 and we hypothesize that the mechanism underlying this response is highly pCO 2 -mediated, night-time storage of dissolved inorganic carbon that fuels daytime calcification.

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Do fluctuating temperature environments elevate coral thermal tolerance?

Cited by 421 publications

References 62 publications

The role of stochastic thermal environments in modulating the thermal physiology of an intertidal limpet, Lottia digitalis

The role of stochastic thermal environments in modulating the thermal physiology of an intertidal limpet, Lottia digitalis

Coral-associated marine fungi form novel lineages and heterogeneous assemblages

Effects of diurnally oscillatingpCO₂on the calcification and survival of coral recruits

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Do fluctuating temperature environments elevate coral thermal tolerance?

Cited by 421 publications

References 62 publications

The role of stochastic thermal environments in modulating the thermal physiology of an intertidal limpet, Lottia digitalis

The role of stochastic thermal environments in modulating the thermal physiology of an intertidal limpet, Lottia digitalis

Coral-associated marine fungi form novel lineages and heterogeneous assemblages

Effects of diurnally oscillatingpCO2on the calcification and survival of coral recruits

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Effects of diurnally oscillatingpCO₂on the calcification and survival of coral recruits