Radiation of the coralline red algae (Corallinophycidae, Rhodophyta) crown group as inferred from a multilocus time-calibrated phylogeny

Peña, Viviana; Vieira, Christophe; Braga, Juan C.; Aguirre, Julio; Rösler, Anja; Baele, Guy; Clerck, Olivier De; Gall, Line Le

doi:10.1016/j.ympev.2020.106845

Cited by 42 publications

(51 citation statements)

References 114 publications

(204 reference statements)

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“…The quantification of CCA species diversity in the geological past is associated to a number of challenges. While for recent CCA the extensive use of molecular phylogenetic methods resolved the four orders (Corallinales, Hapalidiales, Sporolithales, and Rhodogorgonales) currently recognized in the subclass Corallinophycidae as monophyletic lineages 36 , 37 , we have to rely on morphological characters since molecular methods are not available for the identification of fossil CCA. Because CCA show a pronounced phenotypic plasticity depending on environmental factors, their taxonomic identification depends on morphological characters like conceptacles (i.e.…”

Section: Discussionmentioning

confidence: 99%

A possible link between coral reef success, crustose coralline algae and the evolution of herbivory

Teichert

Steinbauer

Kiessling

2020

Sci Rep

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Crustose coralline red algae (CCA) play a key role in the consolidation of many modern tropical coral reefs. It is unclear, however, if their function as reef consolidators was equally pronounced in the geological past. Using a comprehensive database on ancient reefs, we show a strong correlation between the presence of CCA and the formation of true coral reefs throughout the last 150 Ma. We investigated if repeated breakdowns in the potential capacity of CCA to spur reef development were associated with sea level, ocean temperature, CO2 concentration, CCA species diversity, and/or the evolution of major herbivore groups. Model results show that the correlation between the occurrence of CCA and the development of true coral reefs increased with CCA diversity and cooler ocean temperatures while the diversification of herbivores had a transient negative effect. The evolution of novel herbivore groups compromised the interaction between CCA and true reef growth at least three times in the investigated time interval. These crises have been overcome by morphological adaptations of CCA.

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Section: Discussionmentioning

confidence: 99%

A possible link between coral reef success, crustose coralline algae and the evolution of herbivory

Teichert

Steinbauer

Kiessling

2020

Sci Rep

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“…the family, may play a role in this [45][46][47]. The slight decrease in O 2 production in response to increased pCO 2 without any impact on survivorship indicates a potential acclimatory or plastic response to new CO 2 conditions [55,56].…”

Section: Plos Onementioning

confidence: 92%

“…The differences in responses to the independent stressors of temperature and pCO 2 between P. cf. onkodes and Sporolithon could be attributed to a number of reasons including differences between the divergence times of these genera [47,80], their habitat preferences [81], or other unknown factors. The genus Sporolithon diverged during previous times of high temperature and CO 2 , possibly suggesting that if more CO 2 is present, Sporolithon germlings will positively respond as energy usage for CO 2 uptake is reduced and the germlings are able to utilise the additional CO 2 instead of relying on CCMs.…”

Section: Germling Survival and Growthmentioning

confidence: 99%

“…It was hypothesised that pCO 2 would negatively affect the growth and survival of the germlings and this negative effect would be enhanced by increased temperature. The order that Sporolithon belongs to, Sporolithales, has basal evolutionary origins having diverged and persisted during times of elevated temperature and pCO 2 (relative to current levels) [45][46][47], due to this, it was hypothesised that the adult S. cf. durum, although a more recently diverged species from the genus Sporolithon, would acclimate more readily than their germlings to prolonged exposure to increased temperature and pCO 2 , resulting in low mortality and no effect on metabolic rate across all treatments.…”

Section: Introductionmentioning

confidence: 99%

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Plasticity of adult coralline algae to prolonged increased temperature and pCO2 exposure but reduced survival in their first generation

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Díaz-Pulido

2020

PLoS ONE

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Crustose coralline algae (CCA) are vital to coral reefs worldwide, providing structural integrity and inducing the settlement of important invertebrate larvae. CCA are known to be impacted by changes in their environment, both during early development and adulthood. However, long-term studies on either life history stage are lacking in the literature, therefore not allowing time to explore the acclimatory or potential adaptive responses of CCA to future global change scenarios. Here, we exposed a widely distributed, slow growing, species of CCA, Sporolithon cf. durum, to elevated temperature and pCO 2 for five months and their first set of offspring (F 1) for eleven weeks. Survival, reproductive output, and metabolic rate were measured in adult S. cf. durum, and survival and growth were measured in the F 1 generation. Adult S. cf. durum experienced 0% mortality across treatments and reduced their O 2 production after five months exposure to global stressors, indicating a possible expression of plasticity. In contrast, the combined stressors of elevated temperature and pCO 2 resulted in 50% higher mortality and 61% lower growth on germlings. On the other hand, under the independent elevated pCO 2 treatment, germling growth was higher than all other treatments. These results show the robustness and plasticity of S. cf. durum adults, indicating the potential for them to acclimate to increased temperature and pCO 2. However, the germlings of this species are highly sensitive to global stressors and this could negatively impact this species in future oceans, and ultimately the structure and stability of coral reefs.

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“…CCA are important marine organisms because of their role as ecosystem engineers (e.g., construction of coral reefs and maerl beds 15 ) and their contribution to the global carbon cycle 16 . Some CCA genera have persisted and diversified through times of elevated temperature and pCO2/reduced pH that equal or surpass levels projected for the year 2100 [17][18][19] . One could speculate that the evolutionary environmental histories of some genera of CCA would result in inherent resistance to OW and OA, compared with recently diverged genera that have not been exposed to levels of seawater temperature and pCO2/pH that are more extreme than current ocean conditions 17,18 .…”

Section: Mainmentioning

confidence: 99%

Transcriptomic stability or lability explains sensitivity to climate stressors in coralline algae

Page

McDougall

Bar

et al. 2021

Preprint

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Crustose coralline algae (CCA) are calcifying red macroalgae crucial to tropical coral reefs because they cement together the reef framework1. Previous research into the responses of CCA to ocean warming (OW) and ocean acidification (OA) have found reductions in calcification rates and survival2,3, with magnitude of effect being species-specific. Responses of CCA to OW and OA could be linked to evolutionary divergence time and/or their underlying molecular biology, the role of either being unknown in CCA. Here we show Sporolithon durum, a species from an earlier diverged lineage that exhibits low sensitivity to climate stressors, had little change in metabolic performance and did not significantly alter the expression of any genes, showing a stable transcriptomic profile when exposed to temperature and pH perturbations. In contrast, Porolithon onkodes, a species from a recently diverged lineage, reduced photosynthetic rates and had a labile transcriptomic response with over 400 significantly differentially expressed genes in response to experimental treatments, with differential regulation of genes relating to physiological processes. We suggest earlier diverged CCA may be resistant to OW and OA conditions predicted for 2100, whereas taxa from more recently diverged lineages with demonstrated high sensitivity to climate stressors may have limited ability for acclimatisation.

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Radiation of the coralline red algae (Corallinophycidae, Rhodophyta) crown group as inferred from a multilocus time-calibrated phylogeny

Cited by 42 publications

References 114 publications

A possible link between coral reef success, crustose coralline algae and the evolution of herbivory

A possible link between coral reef success, crustose coralline algae and the evolution of herbivory

Plasticity of adult coralline algae to prolonged increased temperature and pCO2 exposure but reduced survival in their first generation

Transcriptomic stability or lability explains sensitivity to climate stressors in coralline algae

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