Modelling susceptibility of coral reefs to environmental stress using remote sensing data and GIS models

Maina, Joseph; Venus, V.; McClanahan, Tim R.; Ateweberhan, Mebrahtu

doi:10.1016/j.ecolmodel.2007.10.033

Cited by 171 publications

(207 citation statements)

References 75 publications

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“…Consequently, while I found strong correspondence in the temperature exposure between the 2 years, other factors such as radiation and water flow and quality could have influenced bleaching responses (McClanahan et al 2005, Maina et al 2008. Because I sampled the same locations and found no differences in light and water flow between them, I suspect that these 2 factors could have but did not influence responses.…”

Section: Discussionmentioning

confidence: 99%

“…Previous bleaching research has indicated that light and water temperature are major influences on bleaching in this region but there are other forces, such as water flow, that could ameliorate responses (Maina et al 2008, McClanahan et al 2005. Consequently, environmental metrics of SST, light, water flow, and Indian Ocean basin-scale temperature variation were either measured in situ or ac cessed from open data sources.…”

Section: Environmental Metricsmentioning

confidence: 99%

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Changes in coral sensitivity to thermal anomalies

McClanahan¹

2017

Mar. Ecol. Prog. Ser.

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The 1998 and 2016 thermal anomalies were among the 2 most severe global-scale anomalies in recent history, with broad-scale impacts on reef condition. In 2 Kenyan fully protected national park reef lagoons, the water flow, light, and temperature exposure severity of these 2 events was grossly similar at 7.3 cm s -1 , ~50 Einsteins m −2 d −1 and ~85 degree-days above summer baseline. Yet, despite similarities in the coral communities' metrics over this time, the bleaching responses were diminished considerably across this 17 yr period. For example, the numbers of pale and bleached colonies declined from 73 to 27% and from 96 to 60% in the low and high thermal exposure reefs, respectively. A metric that weights bleaching by the intensity of the response and the number of individuals of each taxon also found a decline from 35 to 10% and from 65 to 33%. Of the 21 most common coral taxa, 11, including major contributors to coral cover such as Porites and Acropora, showed declines in their sensitivity. Ten taxa, including Montipora and Pocillopora, showed either little or weak evidence for change in sensitivity, and 1 taxon, Acanthastrea, was more sensitive to the exposure in 2016 than in 1998. Sampling limitations and qualitative differences in the pre-peak temperature conditions did not allow separating the influences of genetic adaptation, acclimatization, and community change.

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Section: Discussionmentioning

confidence: 99%

Section: Environmental Metricsmentioning

confidence: 99%

Changes in coral sensitivity to thermal anomalies

McClanahan¹

2017

Mar. Ecol. Prog. Ser.

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“…The and 2005 bleaching events were used for the present analysis because they were the latest, most severe and the most extensively observed coral bleaching events on record. Although the Reefbase data have known uncertainties that stem from the multitude of data contributors, these data have been used to show useful regional stress patterns (Kleypas et al 2008;Maina et al 2008). The use of bleaching severity categories allowed for a more robust assessment of relative bleaching severity, because the surveyor only had to estimate an approximate range of bleaching severity, rather than estimate the per cent bleaching.…”

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confidence: 99%

Corals escape bleaching in regions that recently and historically experienced frequent thermal stress

2009

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The response of coral-reef ecosystems to contemporary thermal stress may be in part a consequence of recent or historical sea-surface temperature (SST) variability. To test this hypothesis, we examined whether: (i) there was a relationship between the historical frequency of SST variability and stress experienced during the most recent thermal-stress events (in 1998 and 2005 -2006) and (ii) coral reefs that historically experienced frequent thermal anomalies were less likely to experience coral bleaching during these recent thermal-stress events. Examination of nine detrended coral d 18O and Sr/Ca anomaly records revealed a high-(5.7-year) and low-frequency (.54-year) mode of SST variability. There was a positive relationship between the historical frequency of SST anomalies and recent thermal stress; sites historically dominated by the high-frequency mode experienced greater thermal stress than other sites during both events, and showed extensive coral bleaching in 1998. Nonetheless, in 2005Nonetheless, in -2006, corals at sites dominated by high-frequency variability showed reduced bleaching, despite experiencing high thermal stress. This bleaching resistance was most likely a consequence of rapid directional selection that followed the extreme thermal event of 1998. However, the benefits of regional resistance could come at the considerable cost of shifts in coral species composition.

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“…Resistance Existing sea surface temperature (SST) data products can be used to evaluate historical SST variability [11,26]. Coarse Nutrients (pollution)…”

Section: Historical Temperature Variabilitymentioning

confidence: 99%

“…Based on global data sets, Maina et al [10,11] developed a spatially explicit global coral reef exposure model that identifies regional hotspots where coral reefs are vulnerable to climate-related stressors and quantifies local stress-reinforcing and stress-reducing factors. The data can be used to assess cumulative impact, as well as change and variability of exposure, all of which may affect corals' abilities to cope with climate change.…”

Section: Introductionmentioning

confidence: 99%

Mapping Coral Reef Resilience Indicators Using Field and Remotely Sensed Data

et al. 2013

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Abstract:In the face of increasing climate-related impacts on coral reefs, the integration of ecosystem resilience into marine conservation planning has become a priority. One strategy, including resilient areas in marine protected area (MPA) networks, relies on information on the spatial distribution of resilience. We assess the ability to model and map six indicators of coral reef resilience-stress-tolerant coral taxa, coral generic diversity, fish herbivore biomass, fish herbivore functional group richness, density of juvenile corals and the cover of live coral and crustose coralline algae. We use high spatial resolution satellite data to derive environmental predictors and use these in random forest models, with field observations, to predict resilience indicator values at unsampled locations. Predictions are compared with those obtained from universal kriging and from a baseline model. Prediction errors are estimated using cross-validation, and the ability to map each resilience indicator is quantified as the percentage reduction in prediction error compared to the baseline model. Results are most promising (percentage reduction = 18.3%) for mapping the cover of live coral and crustose coralline algae and least promising (percentage reduction = 0%) for coral diversity. Our study has demonstrated one approach to map indicators of coral reef resilience. In the context of MPA network planning, the potential to consider reef resilience in addition to habitat and feature representation in decision-support software now exists, allowing planners

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Modelling susceptibility of coral reefs to environmental stress using remote sensing data and GIS models

Cited by 171 publications

References 75 publications

Changes in coral sensitivity to thermal anomalies

Changes in coral sensitivity to thermal anomalies

Corals escape bleaching in regions that recently and historically experienced frequent thermal stress

Mapping Coral Reef Resilience Indicators Using Field and Remotely Sensed Data

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