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A deep-diving swordfish, photographed in the eastern Gulf of Mexico at 701 meters below the surface. Swordfish prefer water temperatures between 18 and 22 °C (64 and 72 °F), [3] but have the widest tolerance among billfish, and can be found from 5 to 27 °C (41 to 81 °F). [6]
Diel vertical migration (DVM), also known as diurnal vertical migration, is a pattern of movement used by some organisms, such as copepods, living in the ocean and in lakes. The adjective "diel" (IPA: / ˈ d aɪ. ə l /, / ˈ d iː. əl /) comes from Latin: diēs, lit. 'day', and refers to a 24-hour period.
Diel vertical migration is a common behavior; many marine species move to the surface at night to feed, then return to the depths during daytime. A number of large marine fishes, such as the tuna , migrate north and south annually, following temperature variations in the ocean.
Acclimatization or acclimatisation (also called acclimation or acclimatation) is the process in which an individual organism adjusts to a change in its environment (such as a change in altitude, temperature, humidity, photoperiod, or pH), allowing it to maintain fitness across a range of environmental conditions.
Trees cannot grow at high altitude, because of cold temperature or lack of available moisture. [82]: 51 The lack of trees causes an ecotone, or boundary, that is obvious to observers. This boundary is known as the tree line. The highest-altitude plant species is a moss that grows at 6,480 m (21,260 ft) on Mount Everest. [83]
The 0 °C isotherm under normal conditions. The freezing level, or 0 °C (zero-degree) isotherm, represents the altitude in which the temperature is at 0 °C (the freezing point of water) in a free atmosphere (i.e. allowing reflection of the sun by snow, icing conditions, etc.).
The species of benthic invertebrates are those which arise greater interest since they are enriched by a great variety of forms and colours due to the abundance of Cnidaria (sea anemones, madrepore and corals). A clear example is the "forest" of yellow and red Paramuricea clavata. These, adding to the substrate, create an ideal benthic ...
The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ in bony fish (but not cartilaginous fish [1]) that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift via swimming, which expends more energy. [2]