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• W2617014782 abstract "Abstract Benthic habitats on deep continental margins (> 1000 m) are now considered heterogeneous – in particular because of the occasional presence of hard substrate in a matrix of sand and mud – influencing the distribution of megafauna which can thrive on both sedimented and rocky substrates. At these depths, optical imagery captured with high-definition cameras to describe megafauna can also describe effectively the fine-scale sediment properties in the immediate vicinity of the fauna. In this study, we determined the relationship between local heterogeneity (10–100 sm) in fine-scale sediment properties and the abundance, composition, and diversity of megafauna along a large depth gradient (1000–3000 m) in a previously-unexplored habitat: the Northeast Fan, which lies downslope of submarine canyons off the Gulf of Maine (northwest Atlantic). Substrate heterogeneity was quantified using a novel approach based on principles of computer vision. This approach proved powerful in detecting gradients in sediment, and sporadic complex features (i.e. large boulders) in an otherwise homogeneous environment because it characterizes sediment properties on a continuous scale. Sediment heterogeneity influenced megafaunal diversity (morphospecies richness and Shannon-Wiener Index) and community composition, with areas of higher substrate complexity generally supported higher diversity. However, patterns in abundance were not influenced by sediment properties, and may be best explained by gradients in food supply. Our study provides a new approach to quantify fine-scale sediment properties and assess their role in shaping megafaunal communities in the deep sea, which should be included into habitat studies given their potential ecological importance." @default.
• W2617014782 created "2017-06-05" @default.
• W2617014782 creator A5061685044 @default.
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• W2617014782 date "2017-08-01" @default.
• W2617014782 modified "2023-09-24" @default.
• W2617014782 title "Hard substrate in the deep ocean: How sediment features influence epibenthic megafauna on the eastern Canadian margin" @default.
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• W2617014782 doi "https://doi.org/10.1016/j.dsr.2017.05.013" @default.
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