Where rivers meet the sea, creating productive brackish habitats.
Salinity varies with tides; organisms are euryhaline. High nutrient input makes them productive. Salt marshes and mudflats filter pollutants and provide bird habitat.
Salinity gradients structure communities. Tidal mixing brings nutrients. Estuaries serve as nurseries for commercially important fish.
Remember: organisms need osmoregulation to cope with changing salinity.
Where rivers meet the sea, creating productive brackish habitats.
Estuaries is one of the 54 topics in Marine & Environmental Biology. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Wetland Ecology, Plankton, Upwelling.
Oyster reefs in estuaries filter water.
Estuaries is a Beginner topic, so no earlier topic is required. Other Beginner topics in Marine & Environmental Biology that pair well with it include Oceans, Ocean Zones, Plankton.
The closest topics to Estuaries are Wetland Ecology, Plankton, Upwelling, Soil Ecology. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Estuaries. To practise the whole of Marine & Environmental Biology, use the Marine & Environmental Biology quiz.
Estuaries: Where rivers meet the sea, creating productive brackish habitats. Wetland Ecology: Wetlands filter water, store carbon, buffer floods and support rich biodiversity. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Wetland Ecology and explain the difference aloud. Finally, take the Marine & Environmental Biology quiz and come back to this page for any question you miss.
Wetlands filter water, store carbon, buffer floods and support rich biodiversity.
🌊 Marine & Environmental BiologyDrifting organisms: phytoplankton photosynthesise and zooplankton feed on them, forming the base of marine food webs.
🌊 Marine & Environmental BiologyWind-driven rise of cold, nutrient-rich water that fuels some of the ocean's richest fisheries.
🌊 Marine & Environmental BiologySoil organisms such as worms, fungi and bacteria drive decomposition and nutrient availability.
🌊 Marine & Environmental Biology