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• W2988198260 abstract "Shallow coral reef and seamount-based ecosystems associated with Pacific islands and atolls host a high and abundant biodiversity, yet many of the ecosystems are threatened by a range of climatic, oceanographic, and anthropogenic stresses. In these types of environments, the morphology and composition of the seabed have been shown to be useful proxies/surrogates for the distribution and abundance of benthic organisms, as well as the other organisms and communities that depend on them. However, currently-available maps of substrate character across these ecosystems are either absent or insufficiently accurate to adequately support ecosystem science and marine spatial planning. We developed classification approaches for substrate mapping in coral reef and deeper-water environments (0–500 m) around the main Hawaiian Islands (MHI) based on multibeam echosounder bathymetry and backscatter, utilizing several key morphological variables together with the backscatter data in an unsupervised classification. Predicted substrate composition (i.e., hard vs soft) reflects the geomorphological character of the seafloor, as the morphology and backscatter-response of the seafloor showed clear associations with diverse features that have been formed over a range of temporal and spatial scales. The resulting substrate maps, together with further seafloor metrics, were then used within species distribution models to predict the biomass distribution of several functional groups (benthic–associated fish species) within the MHI. While depth was estimated to be the most important predictor of biomass distribution, substrate composition and several morphological metrics (at different spatial scales) were also found to be significant predictors. Independent of this, the biomass distribution maps (as well as the seafloor substrate maps) will provide needed spatial information to support marine spatial planning, as well as further ecosystem science (e.g., commercially-important bottomfish communities)." @default.
• W2988198260 created "2019-11-22" @default.
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• W2988198260 date "2020-01-01" @default.
• W2988198260 modified "2023-10-03" @default.
• W2988198260 title "Substrate mapping to inform ecosystem science and marine spatial planning around the main Hawaiian Islands" @default.
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• W2988198260 doi "https://doi.org/10.1016/b978-0-12-814960-7.00037-3" @default.
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