An estuary is a semi-enclosed coastal water
feature where freshwater from rivers and streams interacts
with seawater. Estuaries also sustain distinct ecosystems of plants
and animals that have evolved specifically for living at the sea's edge.
Rising sea levels resulted in the formation of estuaries. As the sea level rose, it submerged river valleys and filled glacial troughs, resulting in the formation of estuaries.
How are Estuaries formed?
.Because many animal species rely on estuaries for feeding and mating, they are often referred to as the "nurseries of the sea."
.22 of the world's 32 major cities are situated on estuaries. . Before rivers and streams flow into the ocean, estuaries filter away sediments and contaminants.
Coastal development, the introduction of invasive species, overfishing, dams, and global climate change have all contributed to the decline of estuaries' health, making them one of the world's most endangered ecosystems.
Life in Estuaries
The water content in nearly all estuaries
changes regularly throughout the tidal cycle.
Plants and animals living in estuaries must be able
to respond quickly to extreme changes in salinity in order to
survive in these environments. Plants and animals are those
that can only tolerate tiny variations in saltwater.