Bleaching effect on regeneration and resource translocation in the coral Oculina patagonica

Fine, Maoz; Oren, U.; Loya, Yossi

doi:10.3354/meps234119

Cited by 68 publications

(41 citation statements)

References 35 publications

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“…This may be explained by a longer stress (bleaching) period experienced by polyps in the perimeter as compared with polyps at the colony center, leading to their death. Fine et al (2002) reported termination of intra-colonial resource translocation toward bleached parts of O. patagonica colonies. It is possible that during bleaching there is a controlled 'blockage' of the unbleached colony section (colony center) from the bleached section (perimeter region).…”

Section: Discussionmentioning

confidence: 99%

Size matters: bleaching dynamics of the coral Oculina patagonica

Shenkar¹,

Fine²,

Loya³

2005

Mar. Ecol. Prog. Ser.

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A 2-yr continuous photographic monitoring of a tagged population of the encrusting coral Oculina patagonica in the Mediterranean was conducted to study intra-colonial bleaching dynamics and the relationship between bleaching, mortality, and colony size. Surveys of non-tagged colonies showed that during the peak bleaching season (August, sea surface temperature = 31°C), non-bleached colonies were frequently found to be small colonies averaging 4.6 ± 2.3 cm in diameter. Within tagged colonies, percent bleached surface area was correlated to water temperature. In colonies that underwent bleaching, the perimeter of the colony was affected first, and, as water temperatures increased, bleaching progressed toward the colony center. During the summer months, partial mortality occurred in the perimeter region of bleached colonies in 22% of the tagged colonies and 25% of the tagged colonies died; 40% of the colonies that died belonged to the largest size group. This partial mortality caused an average decline of 46 ± 27% in the average colony size, resulting in a shift to a smaller size group within the monitored population. Since in this species, colonies as small as 2 cm in diameter are reproductive, bleaching may have a less significant effect on the reproductive fitness of the small size groups in the population. The high mortality of large colonies, high survivorship of the small colonies, and the decline in colony size, due to partial mortality, suggest that, in the case of bleaching in populations of O. patagonica, small colony size is advantageous.

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Section: Discussionmentioning

confidence: 99%

Size matters: bleaching dynamics of the coral Oculina patagonica

Shenkar¹,

Fine²,

Loya³

2005

Mar. Ecol. Prog. Ser.

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“…Disease has been shown to activate directional transport of photosynthates away from the affected area, as if to reduce nutrient availability to the infecting pathogen and restrict resource loss to polyps that cannot be saved (Roff et al 2006). Bleaching that reduces Symbiodinium densities by as little as 40% is capable of halting inter-module translocation of photosynthates altogether, effectively isolating each polyp to fend for itself during stress events (Fine et al 2002). Our results are consistent with the observed responses to other stressors where physiological integration aids in the stress response.…”

Section: Discussionmentioning

confidence: 99%

“…The inverse relationship between colony integration and bleaching suggests that the response to moderate thermal stress may be akin to moderate pre dation, injury, or disease, where integration among modules may contribute to the effectiveness of the colony-wide response by permitting unaffec ted polyps to aid those in distress or to selectively isolate damage and reallocate resources from non-vital life history functions (Pearse & Muscatine 1971, Rinkevich & Loya 1983, Fang et al 1989, Gladfelter et al 1989, Oren et al 1997, Fine et al 2002, Roff et al 2006. Lesion induction has been shown to activate directional transport of photosynthates toward the injured tissue from modules up to 10 cm away, and to reduce reproductive investment up to 15 cm away from the lesion (Oren et al 1997, 2001, Roff et al 2006.…”

Section: Discussionmentioning

confidence: 99%

“…One of the most important advantages of coloniality is that inter-module physiological integration can allow for resource translocation among modules and colony-wide coordinated responses to stimuli (Mackie 1986, Oren et al 2001, Fine et al 2002. Physiological integration can homogenize the distribution of resources acquired through prey capture and symbiont photosynthesis and allow for a more effective colony-wide response to injury, predation, disease, and stress (Pearse & Muscatine 1971, Rinkevich & Loya 1983, Fang et al 1989, Gladfelter et al 1989, Oren et al 1997, Fine et al 2002, Roff et al 2006.…”

Section: Introductionmentioning

confidence: 99%

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Physiological integration of coral colonies is correlated with bleaching resistance

Swain¹,

Bold²,

Osborn³

et al. 2018

Mar. Ecol. Prog. Ser.

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Inter-module physiological integration of colonial organisms can facilitate colony-wide coordinated responses to stimuli that strengthen colony fitness and stress resistance. In scleractinian corals, whose colonial integration ranges from isolated polyps to a seamless continuum of polyp structures and functions, this coordination improves re sponses to injury, predation, disease, and stress and may be one of the indications of an evolutionary origin of Symbiodinium symbiosis. However, observations of species-specific coral bleaching patterns suggest that highly integrated coral colonies may be more susceptible to thermal stress, and support the hypothesis that communication pathways between highly integrated polyps facilitate the dissemination of toxic byproducts created during the bleaching response. Here we reassess this hypothesis by parameterizing an integration index using 7 skeletal features that have been historically employed to infer physiological integration. We examine the relationship between this index and bleaching response across a phylogeny of 88 diverse coral species. Correcting for phylogenetic relationships among species in the analyses reveals significant patterns among species characters that could otherwise be obscured in simple crossspecies comparisons using standard statistics, whose assump tions of independence are violated by the shared evolutionary history among species. Similar to the observed benefits of in creased coloniality for other types of stressors, the results indicate a significantly reduced bleaching response among coral species with highly integrated colonies.KEY WORDS: Colony integration · Colony form · Coral bleaching · Phylogenetically corrected analysis Stylized representation of the phylogeny and morphologies that allowed detection of decreased thermal bleaching with greater polyp integration (coloniality).

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“…In theory, a low proportion of affected branches similar to that observed in January could be obtained in the (Oren et al 1997(Oren et al , 2001KramarskyWinter and Loya 2000;Lirman 2000;Fine et al 2002). If reports of disease …”

Section: Resultsmentioning

confidence: 99%