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Mangroves are trees or shrubs that grow in low-oxygen soil near coastlines in tropical or subtropical latitudes. [8] They are an extremely productive and complex ecosystem that connects the land and sea.
General characteristics of a large marine ecosystem (Gulf of Alaska) Killer whales (orcas) are highly visible marine apex predators that hunt many large species. But most biological activity in the ocean takes place with microscopic marine organisms that cannot be seen individually with the naked eye, such as marine bacteria and phytoplankton.
The organ pipe coral (Tubipora musica) is an alcyonarian octocoral native to the waters of the Indian Ocean and the central and western regions of the Pacific Ocean. [1] It is the only known species of the genus Tubipora.
A school of large pelagic predator fish (bluefin trevally) sizing up a school of small pelagic prey fish (). Pelagic fish live in the pelagic zone of ocean or lake waters—being neither close to the bottom nor near the shore—in contrast with demersal fish that live on or near the bottom, and reef fish that are associated with coral reefs.
Microorganisms make up about 70% of the marine biomass. [4] A microorganism, or microbe, is a microscopic organism too small to be recognised adequately with the naked eye. In practice, that includes organisms smaller than about 0.1 mm. [12]: 13
Entomostraca is a historical subclass of crustaceans, no longer in technical use.It was originally considered one of the two major lineages of crustaceans (the other being the class Malacostraca), combining all other classes—Branchiopoda, Cephalocarida, Ostracoda, Copepoda and Maxillopoda.
There are three basic types of freshwater ecosystems: Lentic (slow moving water, including pools, ponds, and lakes), lotic (faster moving water, for example streams and rivers) and wetlands (areas where the soil is saturated or inundated for at least part of the time).
Saltwater fish, also called marine fish or sea fish, are fish that live in seawater.Saltwater fish can swim and live alone or in a large group called a school. [1]Saltwater fish are very commonly kept in aquariums for entertainment.