Comb jelly diet
Both have two major cell layers: the external epidermis and the internal gastrodermis. Most jellies can detect chemical traces in the water that allow them to locate food, and many are equipped with a gravity-sensitive structure, called a statocyst, that gives them a sense of up and down in the water. ). As seawater temperature rises, predators of jellies are removed by fishing, more structures are built in seawater, and more nutrients flow into the ocean, some types of jellyfish and comb jellies may be finding it easier to grow and survive. As they swim, the comb rows diffract light to produce a shimmering, rainbow effect. Between these layers is a gelatinous material called mesoglea, which makes up most of their bodies. Many jellyfish in the class Hydrozoa, such as this hydromedusa Aglantha digitale, are transparent and easily overlooked. Whatever the reason, huge explosions in jelly numbers (a jelly bloom) can disrupt fisheries, make for unpleasant swimming, or foul up the works of power plants that use seawater for cooling. Yet though they look similar in some ways, jellyfish and comb jellies are not very close relatives (being in different phyla—Cnidaria and Ctenophora, respectively) and have very different life histories. While jellyfish and comb jellies have several anatomical differences, the basics are the same. They are both beautiful—the jellyfish with their pulsating bells and long, trailing tentacles, and the comb jellies with their paddling combs generating rainbow-like colors. Both groups are ancient animals, having roamed the seas for at least 500 million years.
Comb jellies are beautiful, oval-shaped animals with eight rows of tiny comblike plates that they beat to move themselves through the water. Voracious predators on other jellies, some can expand their stomachs to hold prey nearly half their own size. (Ctenophores also have musculature in their in-between layer, the mesoderm, but it likely evolved separately from the mesoderm found in bilaterians like people. Jellies are simple creatures with few specialized organs. Raskoff, Monterey Peninsula College, Hidden Ocean 2005, NOAA. The gastrodermis lines the all-purpose gut and an opening where food enters and reproductive cells are released and taken in. (Although some small species have very thin mesoglea. And, in the modern age, they are having similar effects on ecosystems. ) Jellyfish and comb jellies are 95 percent water and so, rightly, mesoglea is mostly water. Jellies can be very sensitive to water quality during certain points in their life cycle. Raskoff, Monterey Peninsula College, Arctic Exploration 2002, NOAA. Invasive jellies have also wreaked havoc in some parts of the world.
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Comb jelly diet
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