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The Aztec chub or Aztec shiner, [1] (Aztecula sallaei) is a species of freshwater ray-finned fish in the family Leuciscidae, the shiners, daces and minnows. [2] This species is endemic to Mexico . [ 3 ]
Hyalella azteca was first described by Henri Louis Frédéric de Saussure in 1858, under the name Amphitoe aztecus, based on material collected by Aztecs [10] from a "cistern" near Veracruz, Mexico. [11] It has also been described under several junior synonyms, including: [12] Hyalella dentata S. I. Smith, 1874; Hyalella fluvialis Lockington, 1877
The surface and cave forms of the Mexican tetra have proven powerful subjects for scientists studying evolution. [28] When the surface-dwelling ancestors of current cave populations entered the subterranean environment, the change in ecological conditions rendered their phenotype—which included many biological functions dependent on the presence of light—subject to natural selection and ...
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Marine habitats can be broadly divided into pelagic and demersal habitats. Pelagic habitats are the habitats of the open water column, away from the bottom of the ocean. Demersal habitats are the habitats that are near or on the bottom of the ocean. An organism living in a pelagic habitat is said to be a pelagic organism, as in pelagic fish.
In Late Devonian vertebrate speciation, descendants of pelagic lobe-finned fish such as Eusthenopteron exhibited a sequence of adaptations: Panderichthys, suited to muddy shallows; Tiktaalik with limb-like fins that could take it onto land; early tetrapods in weed-filled swamps, such as Acanthostega, which had feet with eight digits, and Ichthyostega, which had limbs.
These lakes were drained by Spanish settlers after the conquest of the Aztec Empire, leading to the destruction of much of the axolotl's natural habitat. As of 2020, the axolotl was near extinction [6] [7] due to urbanization in Mexico City and consequent water pollution, as well as the introduction of invasive species such as tilapia and perch
The Gulf Council was concerned about the effect that the removal of structures serving as artificial reef habitat may have on reef fish fisheries in the region. [39] Artificial reefs can be inhabited by federally managed species and may provide important habitat necessary to fish for spawning, breeding, feeding or growth to maturity. [40]