Complex multivariate model predictions for coral diversity with climatic change

Models of the future of coral reefs are potentially sensitive to theoretical assumptions, variable selectivity, interactions, and scales. A number of these aspects were evaluated using boosted regression tree models of numbers of coral taxa trained on ~1000 field surveys and 35 spatially complete in...

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Vydáno v:Ecosphere (Washington, D.C) Ročník 15; číslo 12
Hlavní autoři: McClanahan, Tim R., Azali, Maxwell K., Muthiga, Nyawira A., Porter, Sean N., Schleyer, Michael H., Guillaume, Mireille M. M.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Hoboken, USA John Wiley & Sons, Inc 01.12.2024
Wiley
Témata:
Africa
Algorithms
Biodiversity
Carbon
climate
Climate change
Climate change models
Coral reefs
corals
Coupled Model Intercomparison Project (CMIP)
Energy consumption
environmental drivers
Heat
Human influences
humans
Intergovernmental Panel on Climate Change (IPCC)
Machine learning
Mapping
predictive spatial modeling
Proxies
regression analysis
Scleractinia
Taxonomy
Temperature
Variables
Water quality
Water temperature
Madagascar
ISSN:2150-8925, 2150-8925
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Shrnutí:Models of the future of coral reefs are potentially sensitive to theoretical assumptions, variable selectivity, interactions, and scales. A number of these aspects were evaluated using boosted regression tree models of numbers of coral taxa trained on ~1000 field surveys and 35 spatially complete influential environmental proxies at moderate scales (~6.25 km2). Models explored influences of climate change, water quality, direct human‐resource extraction, and variable selection processes. We examined the predictions for numbers of coral taxa using all variables and compared them to models based on variables commonly used to predict climate change and human influences (eight and nine variables). Results indicated individual temperature variables alone had lower predictive ability (R2 < 2%–7%) compared to human influence variables (6%–18%) but overall climate had a higher training–testing fit (70%) than the human influence (63%) model. The full variable model had the highest fit to the full data (27 variables; R2 = 85%) and indicated the strongly interactive and complex role of environmental and human influence variables when making moderate‐scale biodiversity predictions. Projecting changes using Coupled Model Intercomparison Project (CMIP) 2050 Representative Concentration Pathways (RCP2.6 and 8.5) water temperature predictions indicated high local variability and fewer negative effects than predictions made by coarse scale threshold and niche models. The persistence of coral reefs over periods of rapid climate change is likely to be caused by smaller scale variability that is poorly simulated with coarse scale modeled predictions.
Bibliografie:Handling Editor
F. Joel Fodrie
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ISSN:2150-8925
2150-8925
DOI:10.1002/ecs2.70057