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Paracanthurus hepatus is a species of Indo-Pacific surgeonfish.A popular fish in marine aquaria, it is the only member of the genus Paracanthurus. [2] [3] A number of common names are attributed to the species, including regal tang, palette surgeonfish, blue tang (leading to confusion with the Atlantic species Acanthurus coeruleus), royal blue tang, hippo tang, blue hippo tang, flagtail ...
These evolutionary domains are called Bacteria and Archaea. [64] The ancestors of modern bacteria were unicellular microorganisms that were the first forms of life to appear on Earth, about 4 billion years ago. For about 3 billion years, most organisms were microscopic, and bacteria and archaea were the dominant forms of life.
The vast majority of bacteria in lakes and ponds obtain their energy by decomposing vegetation and animal matter. In the pelagic zone, dead fish and the occasional allochthonous input of litterfall are examples of coarse particulate organic matter (CPOM>1 mm). Bacteria degrade these into fine particulate organic matter (FPOM<1 mm) and then ...
[3] [4] There has been little research on mixotrophic protists, but recent studies in marine environments found mixotrophic protists contribute a significant part of the protist biomass. [5] Since protists are eukaryotes (and not prokaryotes) they possess within their cell at least one nucleus , as well as organelles such as mitochondria and ...
While not as common, bacterial bioluminescence is also found in terrestrial and freshwater bacteria. [125] These bacteria may be free living (such as Vibrio harveyi) or in symbiosis with animals such as the Hawaiian bobtail squid (Aliivibrio fischeri) or terrestrial nematodes (Photorhabdus luminescens). The host organisms provide these bacteria ...
The littoral zone is the uppermost layer and the warmest water found in lakes and ponds, as the sun directly heats is. [7] This zone hosts the most biodiversity in standing water, with a wide variety of organisms found here, vital to the health of the ecosystem and an important aspect of the diet of organisms in the habitat, like algae ...
The name of the family is derived from the Greek words akantha and oura, which loosely translate to "thorn" and "tail", respectively.This refers to the distinguishing characteristic of the family, the "scalpel" found on the caudal peduncle. [2]
Pond life is an umbrella term for all life forms found in ponds. Although there is considerable overlap with the species lists for small lakes and even slow-flowing rivers, pond life includes some species not found elsewhere, and as a biome it represents a unique assemblage of species.