| Potential impacts | Attributes |
Physical environment | ||
Light Chapter 3.1 | Measure for potential shading of phototrophic benthic and pelagic organisms | Irradiance at different depths from surface to seabed |
Nutrients and carbon Chapter 3.2 | Changes in concentrations may lead to nutrient depletion and inhibition of growth of natural populations of phytoplankton and seaweed | Seawater concentrations of N, P and C |
Hydrography Chapter 3.3 | Changes in water exchange due to seaweed cultivation farm acting as a barrier for water flow and exposure | Current velocity and direction Wind direction and degree of exposure |
Contaminants Chapter 3.7 | Pollution by microplastics in different environmental compartments; seabed, invertebrates, fish, seabirds and marine mammals | If relevant, microplastics abundance (AMAP, 2021) |
Organic matter Chapter 3.8 | Driver for changes in benthos community by increased feed and or increased oxygen consumption | Organic matter in seabed |
Oxygen conditions Chapter 3.8 | Changes in oxygen conditions from degradation of potential enhanced contribution of POM to pelagic and seafloor habitats | Oxygen concentration and consumption in bottom water and seafloor |
Living environment | ||
Phytoplankton Chapter 3.1,3.2 | Changes in primary production and biomass of lowest trophic level as a result of shading and/or nutrient depletion | Chlorophyll a fluorescence |
Benthos Chapter 3.8, 3.9, 3.12 | Changes in benthic communities due to changes in POM contribution, habitat creation and/or disturbance from mooring | Diversity, distribution, composition, abundance |
Marine vegetation communities Chapter 3.1, 3.4, 3.9 | Changes in natural seagrass and seaweed communities caused by shading, introduction of NIS, sampling of mother plants | Diversity, distribution, composition, coverage, density |
Fish Chapter 3.9 | Changes in local fish population due to attraction by introduction of habitat creation and/ or NIS | Diversity abundance (?) |
Seabirds Chapter 3.5, 3.13 | Disturbance from breeding and feeding habitats, mortality from entanglement | Diversity breeding colonies’ abundance |
Marine mammals Chapter 3.5, 3.13 | Disturbance from breeding and feeding habitats, mortality from entanglement | Diversity abundance |
Pathogens Chapter 3.10 | Diseases due to crowding and monoculture. Risk for transfer to natural populations | If relevant, due to knowledge deficiency, eDNA mapping |
Seaweed population genetics Chapter 3.11 | Genetic divergence from the local populations which by genetic transfer may put future health of the natural stocks at risk. | Species population DNA mapping |