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11 results for “Acropora cervicornis”
TagSeq gene expression data from Acropora cervicornis genotypes exhibiting above or below average heat tolerance
<p>TagSeq data taken from Acropora cervicornis genotypes taken from nurseries in the Florida Reef tract and subjected to thermal stress. </p>
Assisted sexual reproduction of Acropora cervicornis for active restoration on Florida's Coral Reef
<p class="MsoNormal">Given the rapid, global decline in the health and abundance of coral reefs, increased investments in restoration-based interventions – including asexual and sexual propagation – are being made by coral reef scientists at research institutions, but also at zoos and aquariums. Mote Marine Laboratory & Aquarium is an independent, non-profit marine science organization dedicated to the conservation and restoration of Florida's Coral Reef, and does so, using science-based strategies. In order to promote the long-term persistence, resilience, and adaptive potential of restored coral populations on Florida's Coral Reef, Mote scientists are performing critical research and restoration activities related to assisted sexual reproduction (ASR). The objective of this study was to optimize ASR of <em>Acropora</em> <em>cervicornis</em> by (1) evaluating broodstock compatibility for genets actively used within Mote's restoration gene pool, (2) optimizing larval settlement by testing spectral cues, (3) and optimizing the grow-out of sexual recruits by testing the impact of light on growth, survival, and algal symbiont uptake in the presence of adult corals or not. Overall, we found that corals and genets spawned with high synchrony, both within and across years, and in terms of predicted spawning times related to nights after the full moon and minutes after sunset. Across two years, overall fertilization success was high (~95%), but we did find one pair of genets that was not compatible. During settlement, larvae preferred pink and purple-colored substrates, which was consistent with our expectation that they would select substrates similar in color to crustose coralline algae (CCA). Interestingly though, they only did so when a matching chemical cue from CCA was also present, indicating that larvae integrate multiple cues simultaneously to determine the most appropriate place to settle. Growth and symbiont uptake were faster in recruits reared in the presence of adult corals and additional lighting, but survivorship was not different through the first ten weeks post-settlement between treatments. A subset of corals was outplanted using two different techniques based on single or clustered corals. We report the initial 1-month survival results. We also provide a detailed protocol and general recommendations for ASR based on years of coral sexual propagation experience.</p>
Assisted sexual reproduction of Acropora cervicornis for active restoration on Florida’s Coral Reef
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Data from: Survivorship and growth in staghorn coral (Acropora cervicornis) outplanting projects in the Florida Keys National Marine Sanctuary
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Data from: Diurnal and nocturnal transcriptomic variation in the Caribbean staghorn coral, Acropora cervicornis
Reef-building corals experience large diel shifts in their environment, both externally due to changes in light intensity, predator activity and prey availability, and internally as a result of diel fluctuations in photosynthesis by their endosymbiotic algae, Symbiodinium. Diel patterns of tentacle behaviour, skeletal growth and gene expression indicate reactions of the coral animal in response to light and through circadian regulation. Some corals, such as the Caribbean Acroporas, have strong within-colony division of labour, including specialized fast-growing apical polyps, accompanied by large gene expression differences. Here we use RNA-seq to evaluate how diel changes in gene expression vary within the branching Caribbean staghorn coral, Acropora cervicornis, between branch tips and branch bases. Multifactor generalized linear model analysis indicated that 6% (3005) of transcripts were differentially expressed between branch tips and bases, while 1% (441) of transcripts were differentially expressed between day and night. The gene expression patterns of 220 transcripts were affected by both time of day and location within the colony. In particular, photoreceptors, putative circadian genes, stress response genes and metabolic genes were differentially expressed between day and night, and some of these, including Amcry1, tef and hebp2, exhibited location-specific regulation within the coral colony as well. These findings indicate that the genetic response of the coral to day and night conditions varies within the colony. Both time of day and location within the colony are factors that should be considered in future coral gene expression experiments.
Data from: Diurnal and nocturnal transcriptomic variation in the Caribbean staghorn coral, Acropora cervicornis
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Data from: Clonal diversity impacts coral cover in Acropora cervicornis thickets: potential relationships between density, growth and polymorphisms
As coral reefs decline, cryptic sources of resistance and resilience to stress may be increasingly important for the persistence of these communities. Among these sources, inter‐ and intraspecific diversity remain understudied on coral reefs but extensively impact a variety of traits in other ecosystems. We use a combination of field and sequencing data at two sites in Florida and two in the Dominican Republic to examine clonal diversity and genetic differentiation of high‐ and low‐density aggregations of the threatened coral Acropora cervicornisin the Caribbean. We find that high‐density aggregations called thickets are composed of up to 30 genotypes at a single site, but 47% of genotypes are also found as isolated, discrete colonies outside these aggregations. Genet–ramet ratios are comparable for thickets (0.636) and isolated colonies after rarefaction (0.569), suggesting the composition of each aggregation is not substantially different and highlighting interactions between colonies as a potential influence on structure. There are no differences in growth rate, but a significant positive correlation between genotypic diversity and coral cover, which may be due to the influence of interactions between colonies on survivorship or fragment retention during asexual reproduction. Many polymorphisms distinguish isolated colonies from thickets despite the shared genotypes found here, including putative nonsynonymous mutations that change amino acid sequence in 25 loci. These results highlight intraspecific diversity as a density‐dependent factor that may impact traits important for the structure and function of coral reefs.
Data from: Heritable variation and lack of tradeoffs suggest adaptive capacity in Acropora cervicornis despite negative synergism under climate change scenarios
<p>Knowledge of multi-stressor interactions and the potential for trade-offs among tolerance traits is essential for developing intervention strategies for the conservation and restoration of reef ecosystems in a changing climate. Thermal extremes and acidification are two major co-occurring stresses predicted to limit the recovery of vital Caribbean reef-building corals. Here we conducted an aquaria-based experiment to quantify the effects of increased water temperatures and pCO2 individually and in concert on 12 genotypes of the endangered branching coral, Acropora cervicornis, currently being reared and outplanted for large-scale coral restoration. Quantification of 11 host, symbiont, and holobiont traits throughout the 2-month long experiment showed several synergistic negative effects, where the combined stress treatment often caused greater reduction in physiological function than the individual stressors alone. However, we found significant genetic variation for most traits and positive trait correlations among treatments indicating an apparent lack of tradeoffs, suggesting that adaptive evolution will not be constrained. Our results suggest that it may be possible to incorporate climate-resistant coral genotypes into restoration and selective breeding programs, potentially accelerating adaptation. </p>
Data from: Heritable variation and lack of tradeoffs suggest adaptive capacity in Acropora cervicornis despite negative synergism under climate change scenarios
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Data from: Clonal diversity impacts coral cover in Acropora cervicornis thickets: potential relationships between density, growth and polymorphisms
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Gene expression dataset for nursery-reared Staghorn coral (Acropora cervicornis) under thermal stress
GEO Series GSE108338. Acropora cervicornis. 12 samples. Type: Expression profiling by high throughput sequencing.
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