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Deep Sea Biology Essay

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Q. 8) Deep-sea Biology (two parts) a. Bioluminescence is an unusual physiological trait. You are either emitting light or you are not. How did evolution cross the gap? In your explanation include a description of how animals use chemistry to make light? “The vast majority of bioluminescent organisms reside in the ocean…” [b] so it is clear that this is where bioluminescence evolved from, and since all life originated in the oceans it is likely that this is a very ancient evolutionary adaptation. Based on the wide variety of organisms that possess bioluminescent traits, it is clear that it evolved independently “…at least 40 times.”[b] According to Dr. Eddith Widder: “Most hypotheses put forth to explain the evolution of luminescent systems …show more content…
List and describe three major functions of bioluminescence. About 50% of all jellyfish are bioluminescent. What do they mostly use bioluminescence for? 1) Mate-finding. Anglerfish use their bioluminescence in part to attract mates. The female is much larger and will attract one or more males to her using her bioluminescent lure. The males will then attach, fuse, and atrophy leaving nothing but a sack of sperm for the female to use for fertilization. [1] 2) Defense. Though the ways in which jellyfish use bioluminescence and for what purpose is still being explored, “…jellyfish use it primarily for defense.”[e] Atolla lanat is a species of jellyfish that uses a ‘burglar alarm’ method of defense[j]. When a predator comes near the jellyfish, or towards a group of jellyfish, it will use an array of flashes to make itself known and to attract much larger predators that will eat what is about to eat itself. Jellies have also been observed to exhibit warning coloration and have been used as a sacrificial tag. [e] 3) Offense. Deep sea predators will often use bioluminescence to illuminate prey, like the Heterophotus ophistoma which uses a searchlight to see prey which is useful for finding transparent prey which are invisible in down welling

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