Sagot :
Helping to protect estuaries
•Plant trees: The biggest problem for estuaries is sedimentation. Land clearance has been a major contributing factor to sedimentation. Experts estimate that about 390 million tonnes of sediment washes from the mainland into the sea every year, affecting estuaries. Native vegetation can be planted alongside rivers and streams that enter estuaries and along estuary margins to help stop erosion and trap sediment and nutrient run-off into the estuary.
•Fence off stock: Landowners around estuaries can fence off streams from stock so that they do not cause streambank erosion of sediment or deposit nutrient-laden effluent into the water that will flow into the estuary. Fencing will also protect planting along riparian (waterway bank) margins as above.
•Improve catchment Improved catchment can help limit pollution that enters estuaries through stormwater run-off. This is important following heavy rainfall. Stormwater brings many pollutants from the land into estuaries through drainage systems.
•Restrict fishing activities: Pay attention to regulations that limit quantity and size of fish and shellfish that can be taken to prevent excessive harvesting.
•Respect marine reserves: Do not take marine life from these areas.
•Biosecurity checks on ships: Ships arriving from overseas are checked to prevent the invasion of exotic species.
•Stop reclaiming land: Stop reclaiming land from estuaries.
•Limit pollution: Help to keep the estuary healthy by not adding solid waste or liquid pollution. Don’t pour harmful substances such as oil, detergent or paint into an estuary or allow these materials to go down stormwater drains that lead to estuaries. Boat owners need to prevent spillage of fuel or detergent into water when refuelling or cleaning boats.
•Report threats to estuaries: Let your local council know if you see something that could be a risk for an estuary – like illegal dumping of rubbish, pollution spills, strange new marine organisms or people cutting down or removing estuarine plants such as mangroves without a permit.
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for more answer visit this link:
https://www.sciencelearn.org.nz/resources/1233-protecting-estuaries