The main challenge and at the same time the most important feature governing species diversity of transitional waters is the variable salinity regime.Salt dissolved in water dehydrates living organisms by exerting what is called osmotic pressure on the cell walls. For example grass (producer) is eaten by rabbits (primary consumer) who are eaten by foxes (secondary consumer). constituents within an estuary. Detritus feeders, plant grazers, and zooplankton are the primary consumers, and the secondary consumers and tertiary consumers include estuarine birds, ducks, invertebrate predators, and fish. What are three examples of primary consumers from estuaries? An estuary may also be called a bay, lagoon, sound, or slough. A primary consumer eats the producer, a secondary consumer eats the primary consumer. These resources focus on the different types of estuaries, how they interact with surrounding areas, what kinds of producers, consumers, and decomposers exist there, and the adaptations organisms have made to survive in these areas. An estuary is an area where a freshwater river or stream meets the ocean. Estuaries are usually rich in nutrients due to the mix of fresh and salty waters. Fish, birds, and benthic Marco-invertebrates -3. Estuaries are among the most productiv:~}?ar~n~).~'tosystems of the world" with primary production estimates for phytopfarikton ranging between 7 and 875 g C m-2 year-I (Boynton et at. Phytoplankton is "plant plankton," the primary producer and the basis of the complex fjord food web. Estuaries Many primary producers are first converted by bacterial decomposition into organic detritus which serves as a major food source for the majority of consumers living in the estuarine community. The challenges of estuarine ecosystems. River inflow is largely controlled by upstream reservoir releases. Salt snails, quick fish, and squat jellies. What are three examples of primary consumers from estuaries? What is a secondary consumer? ... Primary consumers. -3. Consumers cannot create organic carbon from its inorganic form, and thus consume either primary producers or other consumers to acquire the organic carbon necessary for life. Primary consumers rely upon primary production as a main food source. Estuaries are peculiar yet challenging ecosystems. For example, primary producers transform inorganic carbon in the atmosphere or water into organic biomolecules to make living tissue. The primary fresh water inputs to the estuary derive from runoff of regional precipitation, the Sacramento River, and the San Joaquin River. 1997), saltmarsh mudflat infauna at Plum Island Estuary, USA (Galvan et al. Primary producers use the sun's energy to convert carbon dioxide and nutrients into carbohydrates which feed the primary consumers who eat the phytoplankton - and who are in turn eaten by secondary consumers. Estuaries are rich in food sources for the primary consumer trophic level in the food web. Phytoplankton, as we have seen, is limited by turbidity but is nevertheless a rich source of food. Water continually circulates into and out of an estuary. Within the estuaries, the plants and other primary producers (algae) convert energy into living biological materials. In estuaries, the salty ocean mixes with a freshwater river, resulting in brackish water.Brackish water is somewhat salty, but not as salty as the ocean. An estuary is a partly concealed body of water where fresh water from rivers and canals mixes with the salty and brackish waters of the open sea. 2008), and the Pearl River estuary, China (Lee 2000), for cockles in Marennes‐Oleron Bay, France (Kang et al. Estuaries facilitate the development of various land forms at the coast such as bays, lagoons, harbors, inlets and fjords. The main food source is however the large quantities of detritus which abound in the water column and on the bottom of the estuary. -1. Benthic primary production was also found to be dominant in salt marsh consumers in Mont St. Michel, France (Creach et al. A secondary consumer consumes the animals that eats plants.