English Nature's proposed list of categories of operations which may cause deterioration or disturbance to interest features and sub-features, together with the processes that link the operation to the ecological requirements of the interest feature and examples of activities which may cause such effects (Burt et al in preparation).

Categories of operations which may cause deterioration or disturbance to interest features of sub-features

Processes (with examples of maritime activity)

Physical loss of interest feature or sub-feature Removal (e.g. land claim, harvesting)

Smothering (e.g. disposal of dredged material)

Physical damage to interest feature or sub-feature Siltation (e.g. dredging)

Abrasion (e.g. fishing trawls, direct human contact)

Selective extraction (e.g. aggregate dredging)

Non-physical disturbance to interest feature or sub-feature Noise (e.g. cargo handling)

Visual presence (e.g. recreational activity)

Toxic contamination of interest feature or sub-feature Introduction of synthetic compounds (e.g. TBT)

Introduction of non-synthetic (e.g. heavy metals)

Introduction of radio-nuclides.

Non-toxic contamination of interest feature or sub-feature Nutrient enrichment (e.g. waste-water discharge)

Organic enrichment (e.g. waste-water discharge)

Changes in suspended sediment and turbidity (e.g. dredging)

Changes in salinity (e.g. water abstraction)

Changes to thermal regime

Biological disturbance to interest feature or sub-feature Introduction of microbial pathogens (e.g. industrial and waste water outfalls)

Introduction of non-native species and translocation (e.g. ballast water exchange)

Selective extraction of species (e.g. commercial and recreational fisheries)

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