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Thread: Complexity of Animal Form Related to Species Density

  1. #1 Complexity of Animal Form Related to Species Density 
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    It seems that the greater the species density the greater the complexity of animal form (color, shape, behavior). Why is this the case? (Why are tropical fish colorful and strange while cold water fish are often gray and boring?)


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    i don't know if this fits into your question, but i recently heard someone say by weight there are more pounds of ants, than humans. this would make them pretty dense and there is nothing plainer.

    your tropical fish are probably tank raised, as fish are species that do grow in size as to there environment. at the sizes in you tank, they would not last long in there natural or original environment. the larger size, some several hundred times yours, have a little better chance even then do not dominate. gold fish for instance (tho not tropical) grow to 2+ feet or so and several pounds. Angels to 18-24 inches, tiger barbs to a foot and guppies are young fish of various others and bred into color, fins etc. today most all guppies are tank or farm bred. the silver fish is a domesticated ParanĂ¡. the Archer fish is a little more interesting and will grow to the amount you feed them and the tank size. i have seen 18 inch archers in 50 gallon tanks, but i no idea how big they can get in nature. to me another interesting point is maturity. although very small to there cousins in natural environment, they mature and reproduce at the smaller size.

    as to cold water fish and the variety found in fresh water, very some from salt water, but do have some with color. in fact the deeper you go the more color you can see. any lack of color is probably a result of the food chain. i don't know if fish are color blind, but if not that bright color would make an easy chase for all the predators in an environment that feed off each other. by the way there is a salt water angel fish and many other fish that also grow in warm, shallow tropical conditions.


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    Thanks! It doesn't answer my question exactly but your reply is interesting. Now I have more questions! Hmm, are fish color blind? If so then why would they be colored? Is color a way for fish to communicate or does it have some sort of internal health benefit (like the way green helps a plant photosynthesize). Probably both I imagine.
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  5. #4  
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    Quote Originally Posted by backwardghost
    Thanks! It doesn't answer my question exactly but your reply is interesting. Now I have more questions! Hmm, are fish color blind? If so then why would they be colored? Is color a way for fish to communicate or does it have some sort of internal health benefit (like the way green helps a plant photosynthesize). Probably both I imagine.
    Ive heard it both ways. many feel fish are color blind as the color of bait has never mattered to the fisherman. (flashy or metal and smell seem to attract). on the other hand colorful fish do have trouble surviving. fish seem to act primarily on instinct, color should have little to do with it, since look alike but not do not link with other schools. they also feed on smaller fish of there kind in most cases. pigment no doubt has to do with scale colors and as mentioned survival will eventually weed out some or all color. this should have nothing to do with health. color in people is altered by blood flow and some other factors caused by sickness in warm blooded spieces. fish are cold blooded and even if you cut off there head the appearance of scale or skin, will not change.

    did you know ick (Sp?), is comparable to our cold and the best cure b4 that blue stuff, was to place a fresh water fish in salt water (no iodine) or a salt water fish in fresh.

    the green in plants is technically a result of sunlight. all plants are not green and a none in the oceans deep waters. there are many and well below where sunlight goes.
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