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An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. [1] Estuaries form a transition zone between river environments and maritime environments and are an example of an ecotone.
Also called resource cost advantage. The ability of a party (whether an individual, firm, or country) to produce a greater quantity of a good, product, or service than competitors using the same amount of resources. absorption The total demand for all final marketed goods and services by all economic agents resident in an economy, regardless of the origin of the goods and services themselves ...
The Upper Estuary takes up the most area of the park, making up approximately 53%. [5] It is characterized by wide flats, islands, and strong tides. [5] It is the shallowest and warmest region, and has a rough sea floor. [14] [15] The water is high salinity-wise, but good circulation in this area mixes it well with freshwater. [14]
A marine coastal ecosystem is a marine ecosystem which occurs where the land meets the ocean. Worldwide there is about 620,000 kilometres (390,000 mi) of coastline. Coastal habitats extend to the margins of the continental shelves, occupying about 7 percent of the ocean surface area.
James Stuart (1767) authored the first book in English with 'political economy' in its title, explaining it just as: . Economy in general [is] the art of providing for all the wants of a family, so the science of political economy seeks to secure a certain fund of subsistence for all the inhabitants, to obviate every circumstance which may render it precarious; to provide everything necessary ...
The Estuary plays host to a plethora of species of marine and terrestrial flora and fauna, and multiple conservation organisations exist that maintain the area. Geologically, it is situated on a continental margin of the North American Plate .
The San Francisco Estuary has a numerous sources of nutrients that can be used for primary production, derived largely from waste water treatment facilities, agricultural and urban drainage, and the ocean. [20] [21] In spite of this, the estuary is unique in that it tends to have a relatively depressed rate of primary production. [22]
The National Estuary Program is made up of 28 smaller organizations set up regionally by estuary. Each of the estuary organizations is managed by local community leaders and staff. Participating organizations may include universities, local non-profit organizations, and state and local government agencies.