7 Questions
What is the advantage of studying heat-resistant corals?
To determine the mechanisms of coral response to climate change
What is the difference in temperature between the highly variable (HV) and moderately variable (MV) pools in the U.S. National Park of American Samoa?
The HV pool often exceeds the local critical bleaching temperature of 30°C, reaching 35°C during strong noontime low tides, while the MV pool rarely experiences temperatures above 32°C
What is the intensity parameter I in evolutionary biology?
The change in mean phenotype before versus after natural selection, divided by the standard deviation
What is the average contribution of acclimation to phenotypic differences in corals native to different pools?
42%
What loci may be due to adaptive evolution or other factors such as epigenetics or symbiont type?
Both A and C
What is the potential impact of acclimatization on predictions for coral reef demise?
It can worsen the predictions
What is the difference between acclimation and adaptation in gene expression shifts in corals, and what is the contribution of acclimation to phenotypic differences?
Acclimation and adaptation both contribute to gene expression shifts in corals. The contribution of acclimation was measured by swapping corals between pools, and it was found to average 42% of the phenotypic difference.
Study Notes
Acclimation and adaptation in gene expression shifts in corals
- Gene expression shifts in corals can be attributed to both acclimation and adaptation.
- 141 contigs showed significant differences in gene expression levels between corals native to different pools.
- The contribution of acclimation was measured by swapping corals between pools, and it was found to average 42% of the phenotypic difference.
- Fixed effects, including TNFR and cellular transport loci, may be due to adaptive evolution or other factors such as epigenetics or symbiont type.
- Loci with strong acclimation components include TRAF, Ras and Rab proteins, transcription factors, and heat shock proteins.
- Corals have the ability to acclimate to local differences, as seen in differences in bleaching temperatures between conspecific corals at different latitudes.
- Coral acclimatization or local adaptation can alter predictions of climate change effects and potentially change predictions for coral reef demise.
- Acclimatization can allow corals to acquire high-temperature resistance more quickly than strong natural selection would produce.
- It is unknown how many coral species can acclimate or evolve, and whether there is an upper thermal limit to acclimatization or adaptation.
- Multiple stressors, such as acidification and heat, can reduce the ability of corals to respond to environmental changes.
- The rate and scope of acclimatization in coral species is central to understanding the impact of climate change on coral reefs.
- Acclimatory and adaptive responses allowed fast-growing, shallow-water corals to inhabit reef areas with water temperatures far above their expected tolerances.
Acclimation and adaptation in gene expression shifts in corals
- Gene expression shifts in corals can be attributed to both acclimation and adaptation.
- 141 contigs showed significant differences in gene expression levels between corals native to different pools.
- The contribution of acclimation was measured by swapping corals between pools, and it was found to average 42% of the phenotypic difference.
- Fixed effects, including TNFR and cellular transport loci, may be due to adaptive evolution or other factors such as epigenetics or symbiont type.
- Loci with strong acclimation components include TRAF, Ras and Rab proteins, transcription factors, and heat shock proteins.
- Corals have the ability to acclimate to local differences, as seen in differences in bleaching temperatures between conspecific corals at different latitudes.
- Coral acclimatization or local adaptation can alter predictions of climate change effects and potentially change predictions for coral reef demise.
- Acclimatization can allow corals to acquire high-temperature resistance more quickly than strong natural selection would produce.
- It is unknown how many coral species can acclimate or evolve, and whether there is an upper thermal limit to acclimatization or adaptation.
- Multiple stressors, such as acidification and heat, can reduce the ability of corals to respond to environmental changes.
- The rate and scope of acclimatization in coral species is central to understanding the impact of climate change on coral reefs.
- Acclimatory and adaptive responses allowed fast-growing, shallow-water corals to inhabit reef areas with water temperatures far above their expected tolerances.
"Test Your Knowledge on Heat-Resistant Corals and Bleaching Events" - Learn about how coral populations cope with warm-water exposure and the impact of bleaching events. Explore recent research on heat-resistant corals and their survival in naturally warm environments. Challenge your understanding of these fascinating organisms and their responses to changing ocean temperatures.
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