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| [1.] Tim/Fragment 042 02 - Diskussion Zuletzt bearbeitet: 2014-12-12 22:40:36 WiseWoman | Fragment, Gesichtet, SMWFragment, Schutzlevel sysop, Tim, Verschleierung, Wikipedia Snakelocks anemone 2012 |
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| Untersuchte Arbeit: Seite: 42, Zeilen: 2-18 |
Quelle: Wikipedia Snakelocks anemone 2012 Seite(n): online source, Zeilen: - |
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| On average the anemone is 8 cm large.
Unlike other cnidarians, anemones (and other Anthozoa) entirely lack the free-swimming medusa stage of the life cycle; the polyp produces eggs and sperm, and the fertilized egg develops into a planula that develops directly into another polyp. Anemones tend to stay in the same spot until conditions become unsuitable (prolonged dryness, for example), or a predator attacks them. In that case, anemones can release themselves from the substrate and use flexing motions to swim to a new location. Most sea anemones attach temporarily to submerged objects; a few thrust themselves into the sand or live in furrows; a few are parasitic on other marine organisms. The sexes in sea anemones are separate in some species, while others are protandric hermaphrodites. The gonads are strips of tissue within the mesenteries. Both sexual and asexual reproduction can occur. In sexual reproduction males release sperm to stimulate females to release eggs, and fertilization occurs. Anemones eject eggs and sperm through the mouth. The fertilized egg develops into a planula, which settles and grows into a single polyp. In asexual reproduction extratentacular budding occurs, a type of fission, where the anemone will split roughly in half generally through the mouth. This species is extremely adaptable to various conditions of temperature and salinity. |
On average the snakelock anemone is 8 cm large.
[...] Unlike other cnidarians, anemones (and other Anthozoa) entirely lack the free-swimming medusa stage of the life cycle; the polyp produces eggs and sperm, and the fertilized egg develops into a planula that develops directly into another polyp. Anemones tend to stay in the same spot until conditions become unsuitable (prolonged dryness, for example), or a predator attacks them. In that case anemones can release themselves from the substrate and use flexing motions to swim to a new location. Most sea anemones attach temporarily to submerged objects; a few thrust themselves into the sand or live in furrows; a few are parasitic on other marine organisms.[1] The sexes in sea anemones are separate in some species, while others are protandric hermaphrodites. The gonads are strips of tissue within the mesenteries. Both sexual and asexual reproduction can occur. In sexual reproduction males release sperm to stimulate females to release eggs, and fertilization occurs. Anemones eject eggs and sperm through the mouth. The fertilized egg develops into a planula, which settles and grows into a single polyp. In asexual reproduction extratentacular budding occurs, a type of fission, where the anemone will split roughly in half generally through the mouth. [...] [...] It rapidly adapts to aquarium life as they are extremely adaptable to various conditions. |
The source is not mentioned. Note that there are invisible, but active wikipedia links for "cnidarians", "Anthozoa" and "medusa" in the PDF file of the thesis that is available for download. In the source one can find the same links. |
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Letzte Bearbeitung dieser Seite: durch Benutzer:Hindemith, Zeitstempel: 20141024200020