Many undisturbed marine habitats have a well-developed three-dimensional structure and heterogeneity, providing niches for a diverse array of organisms. Activities such as trawling and dredging, in particular, grossly simplify habitat structures either by uprooting, crushing and flattening epifaunal species or by disrupting sediment stratification, burrows and other structures for infaunal species (see Section 6.10.2).

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Department of Environment and Heritage