Comparison of recruitment tile materials for monitoring coralline algae responses to a changing climate

Kennedy, Emma V.; Ordoñez, Alexandra; Lewis, Bonnie; Díaz-Pulido, Guillermo

doi:10.3354/meps12076

Cited by 38 publications

(35 citation statements)

References 59 publications

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“…PVC was selected owing to the success in previous experiment on larval recruitment (C Cerrano, pers. comm., 2010; but see also Kennedy et al, 2017 ). Moreover, having positive buoyancy, the risk of detachment from the ceiling was avoided.…”

Section: Methodsmentioning

confidence: 96%

Living upside down: patterns of red coral settlement in a cave

Costantini

Rugiu

Cerrano

et al. 2018

PeerJ

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BackgroundLarval settlement and intra-specific interactions during the recruitment phase are crucial in determining the distribution and density of sessile marine populations. Marine caves are confined and stable habitats. As such, they provide a natural laboratory to study the settlement and recruitment processes in sessile invertebrates, including the valuable Mediterranean red coral Corallium rubrum. In the present study, the spatial and temporal variability of red coral settlers in an underwater cave was investigated by demographic and genetic approaches.MethodsSixteen PVC tiles were positioned on the walls and ceiling of the Colombara Cave, Ligurian Sea, and recovered after twenty months. A total of 372 individuals of red coral belonging to two different reproductive events were recorded. Basal diameter, height, and number of polyps were measured, and seven microsatellites loci were used to evaluate the genetic relationships among individuals and the genetic structure.ResultsSignificant differences in the colonization rate were observed both between the two temporal cohorts and between ceiling and walls. No genetic structuring was observed between cohorts. Overall, high levels of relatedness among individuals were found.ConclusionThe results show that C. rubrumindividuals on tiles are highly related at very small spatial scales, suggesting that nearby recruits are likely to be sibs. Self-recruitment and the synchronous settlement of clouds of larvae could be possible explanations for the observed pattern.

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Section: Methodsmentioning

confidence: 96%

Living upside down: patterns of red coral settlement in a cave

Costantini

Rugiu

Cerrano

et al. 2018

PeerJ

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show abstract

“…For example, rafting on pumice has been recorded previously (Bryan et al, 2012), and it is extremely likely that this occurs on other substrates such as kelp holdfasts and other drifting macroalgae that have large dispersal capacity (Fraser et al, 2018). Coralline algae are almost always the first colonizers to occupy new space on new substrate in many systems (Kroeker et al, 2013;Fabricius et al, 2015;Kennedy et al, 2017), demonstrating their ability to spread quickly. Their migration over large spatial scales could thus be relatively rapid.…”

Section: Coralline Algal Bleachingmentioning

confidence: 98%

Impacts of Ocean Warming on Coralline Algal Calcification: Meta-Analysis, Knowledge Gaps, and Key Recommendations for Future Research

2019

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Coralline algae are foundation species in many hard-bottom ecosystems acting as a settlement substrate, and binding together and even creating reefs in some locations. Ocean acidification is known to be a major threat to coralline algae. However, the effects of ocean warming are less certain. Here we bring multiple lines of evidence together to discuss the potential impacts of ocean warming on these ecologically crucial taxa. We use a meta-analysis of 40 responses within 14 different studies available which assessed the effects of increasing temperature on coralline algal calcification in laboratory experiments. We find a net negative impact of increasing temperature on coralline algal calcification at 5.2 • C above ambient conditions. Conversely, negative effects are observed when temperature drops below 2.0 • C from ambient conditions. We propose that some coralline algae will be more capable of both acclimatizing and locally adapting to increasing ocean temperatures over the coming decades. This is because many species possess short generation times, the ability to opportunistically rapidly utilize open space, and relatively high phenotypic plasticity. However, less resistant and resilient species will be those that are long-lived, those with long generation times, or with narrow thermal tolerances (e.g., tropical taxa living close to their thermal maxima). Additionally, ocean warming will occur simultaneously with ocean acidification, a potentially greater threat to coralline algae, which could also reduce any tolerance to ocean warming for many species. To maximize the potential to accurately determine how coralline algae will respond to future ocean warming and marine heatwaves, future research should use environmentally relevant temperature treatments, use appropriate acclimation times and follow best practices in experimental design.

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“…Germlings were grown on an acrylic substrate in the laboratory environment, whereas, in the field germlings would most likely be growing on porous carbonate substrate with diverse endolithic and epilithic algal communities that modify carbonate chemistry via metabolic processes. Past studies have found substrate to not be critical for CCA community structure [76], however, if substrate plays a role in germling calcification and growth in the presence of lowered pH has not been investigated and it is possible that the carbonate substrate in the field could act as a buffer to changes in carbonate chemistry surrounding the germling. It is important to note that under all treatments, there was mortality and reductions in growth rate.…”

Section: Germling Survival and Growthmentioning

confidence: 99%

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

Page

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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Comparison of recruitment tile materials for monitoring coralline algae responses to a changing climate

Cited by 38 publications

References 59 publications

Living upside down: patterns of red coral settlement in a cave

Living upside down: patterns of red coral settlement in a cave

Impacts of Ocean Warming on Coralline Algal Calcification: Meta-Analysis, Knowledge Gaps, and Key Recommendations for Future Research

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

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