Energetic cost of photoinhibition in corals

Hoogenboom, Mia O.; Anthony, Ken; Connolly, Sean R.

doi:10.3354/meps313001

Cited by 84 publications

(71 citation statements)

References 48 publications

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“…The F v /F m decline in March might be due to cold seawater temperature accompanied by a sharp rise in light intensity. The photosynthetic apparatus of zooxanthellae that are acclimated to weak light might become inactivated by the increase in sunlight (Hoogenboom et al 2006). The mechanism of photosynthetic inactivation induced by cold temperature in corals is thought to be similar to that induced by high temperature (Saxby et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Seasonal fluctuation in zooxanthellar genotype composition and photophysiology in the corals Pavona divaricata and P. decussata

Suwa¹,

Hirose²,

Hidaka

2008

Mar. Ecol. Prog. Ser.

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We simultaneously examined seasonal fluctuations in maximum quantum yield (F v /F m ), cell density and genotypic clade composition of zooxanthellae in the sympatric corals Pavona divaricata and P. decussata at a high latitude site in Okinawa, Japan. The 2 species had different responses to seasonal changes in light and seawater temperature. P. decussata was associated only with clade C zooxanthellae (at all sampling times) while genotypic clade composition fluctuated in P. divaricata. Three colonies of P. divaricata harbored clade D throughout the year and the other 7 colonies changed clade type from C to D or vice versa, or contained a mixture of both clades on some sampling occasions. Though neither coral species suffered bleaching during the experimental period, there were F v /F m decreases in P. decussata and P. divaricata harboring clade C during cold and warm seasons; F v /F m of P. divaricata harboring clade D was stable. When exposed to low or high temperature under normal or high light, P. divaricata harboring clade D was less damaged and Photosystem II recovery was faster than in P. decussata harboring clade C. These results suggest that the sympatric congeneric corals have different symbiont switching flexibilities and this difference might account for the observed difference in stress susceptibility between the two species. In high-latitude reefs, both winter low temperatures and summer high temperatures may be potential stressors that cause coral bleaching, at least in corals with high clade C zooxanthellar fidelity.

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Section: Discussionmentioning

confidence: 99%

Seasonal fluctuation in zooxanthellar genotype composition and photophysiology in the corals Pavona divaricata and P. decussata

Suwa¹,

Hirose²,

Hidaka

2008

Mar. Ecol. Prog. Ser.

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“…While decreased fluorescence yield is a common stress response, few studies have examined the energetic consequences of such changes. Daily energetic costs of natural photoinhibition (i.e., reduced yield due to light stress) are negligible but can have adverse effects in the long term (Hoogenboom et al, 2006). Sedimentation stress has the additional danger of tissue loss or necrosis due to smothering.…”

Section: Implications For Field Studiesmentioning

confidence: 99%

“…The site, environmental conditions, and stress characteristics should be described as completely as possible. Finally, PAM studies may be most effective when paired with additional response variables, since yield reduction may not always have an energetic consequence (Hoogenboom et al, 2006). …”

Section: Conclusion and Future Concernsmentioning

confidence: 99%

Effects of two sediment types on the fluorescence yield of two Hawaiian scleractinian corals

Piniak¹

2007

Marine Environmental Research

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“…These symbiotic associations have physiological properties favoring the enhancement of light harvesting and can be expected to successfully colonize deep or shaded habitats. In very shallow water, they are probably limited by oxidative stress resulting from extreme light excitation (note the highest Qm was measured for M. senaria at 5 m; see Table 1), a phenomenon supposed to influence the upper limit of distribution of scleractinians (Hoogenboom et al 2006). In our sampling approach, purposely limited to exposed colonies to fully capture the depth-light effect, the M. senaria samples collected at 5-m depth are part of the rare conspecific colonies at that depth that occupy noncryptic habitats.…”

Section: Positionmentioning

confidence: 99%

In situ photobiology of corals over large depth ranges: A multivariate analysis on the roles of environment, host, and algal symbiont

Frade

Bongaerts

Winkelhagen

et al. 2008

Limnology & Oceanography

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We applied a multivariate analysis to investigate the roles of host and symbiont on the in situ physiological response of genus Madracis holobionts towards light. Across a large depth gradient (5-40 m) and for four Madracis species and three symbiont genotypes, we assessed several variables by measuring chlorophyll a fluorescence, photosynthetic pigment composition, or symbiont population descriptors. Most of the variation is explained by two major photobiological components: light-use efficiency and symbiont cell densities. Two other minor components emphasize photoprotective pathways and light-harvesting properties such as secondary pigments. Statistics highlight the role of irradiance on coral physiology and reveal mechanisms that are either genetically constrained, such as symbiont cell sizes, or environmentally dependent, such as photochemical efficiencies. Other parameters, such as cellular light-harvesting and photoprotective pigment concentrations, are regulated by host, symbiont, and environment. The interaction between host and environment stresses the role of host properties in adjusting the internal environment available for the endosymbionts. Different holobiont strategies, relating to symbiont cell density, vary in their physiological optimization of light-harvesting or photoprotective mechanisms and link to host-species distribution and dominance over the reef slope. Symbiont functional diversity appears to have a significant role but does not explain host vertical distribution patterns per se, highlighting the importance of species-specific morphological and physiological properties of the coral host.

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Energetic cost of photoinhibition in corals

Cited by 84 publications

References 48 publications

Seasonal fluctuation in zooxanthellar genotype composition and photophysiology in the corals Pavona divaricata and P. decussata

Seasonal fluctuation in zooxanthellar genotype composition and photophysiology in the corals Pavona divaricata and P. decussata

Effects of two sediment types on the fluorescence yield of two Hawaiian scleractinian corals

In situ photobiology of corals over large depth ranges: A multivariate analysis on the roles of environment, host, and algal symbiont

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