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Commercial fish enhancement values are based on a model, informed by
field data, to estimate the finfish catch enhancement value of mangroves across the world. To calculate the number of individuals enhanced by mangroves, the team derived a model of fish density enhancement value from mangrove which incorporated biophysical and environmental inputs (e.g., salinity, sea surface temperature, productivity, mangrove edge length and area, and tidal amplitude). These values were then multiplied by an estimate of fishing pressure, derived from variables including population density, access to cities, proximity of key fishing habitats (coral reefs, mangroves, shallow shelfs), and storminess.The commercial fish covered include representatives from all regions, however they do not include all commercial species enhanced by mangroves- only those strongly affiliated with mangroves and so estimates may be conservative. Further, there is a possible sampling bias between regions and so results are most useful for comparing enhancement within regions, and should be viewed with caution in making inter-regional comparisons. |