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Barnacle: Difference between revisions
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The [[life process]] of a barnacle consists of three stages. The nauplius, the cyprid, and the adult stage.[http://www.absoluteastronomy.com/topics/Barnacle#encyclopedia] | The [[life process]] of a barnacle consists of three stages. The nauplius, the cyprid, and the adult stage.[http://www.absoluteastronomy.com/topics/Barnacle#encyclopedia] | ||
The first step of the process is fertilization. The barnacle will release sperm into the ocean | The first step of the process is fertilization. The barnacle will release sperm into the ocean. The sperm will travel until the sperm enters another barnacle. When the sperm reaches another barnacle it is delivered to the mantle cavity to fertilize the eggs that are stored there. In some species the barnacle will extend its extremely long penis to another barnacle and inject the sperm to fertilize it.[http://webs.lander.edu/rsfox/invertebrates/balanus.html] | ||
The eggs will hatch as a nauplius: a small larval creatures with one eye, two antennae, and several mandibles. [http://webs.lander.edu/rsfox/invertebrates/balanus.html] The nauplius will usually moult six times before it morphs into the next stage. It usually moults once before it is released from the mantle cavity and into the open ocean. | The eggs will hatch as a nauplius: a small larval creatures with one eye, two antennae, and several mandibles.[http://webs.lander.edu/rsfox/invertebrates/balanus.html] The nauplius will usually moult six times before it morphs into the next stage. It usually moults once before it is released from the mantle cavity and into the open ocean.[http://www.absoluteastronomy.com/topics/Barnacle#encyclopedia] | ||
After it has spent its time as a free-swimming creature and has moulted enough it will change into its next form. The cypris stage of a barnacle is a [[bivalve]] with the creature between the two shells. The cypris has one naupliar eye, and two compound eyes that it uses to navigate around the ocean. It has an antennae from its previous form and six pairs of appendages that help it to move around the ocean.[http://webs.lander.edu/rsfox/invertebrates/balanus.html] It then uses its antennae to find an appropriate location to settle. This search can take days or weeks, and the cypris conserves energy by not feeding. When the cypris has found somewhere to settle it extends its antennae to the surface and secretes a cement-like substance. It then pulls itself to that surface and becomes permanently attached. After time it will eventually morph into its adult form.[http://www.absoluteastronomy.com/topics/Barnacle] | After it has spent its time as a free-swimming creature and has moulted enough it will change into its next form. The cypris stage of a barnacle is a [[bivalve]] with the creature between the two shells. The cypris has one naupliar eye, and two compound eyes that it uses to navigate around the ocean. It has an antennae from its previous form and six pairs of appendages that help it to move around the ocean.[http://webs.lander.edu/rsfox/invertebrates/balanus.html] It then uses its antennae to find an appropriate location to settle. This search can take days or weeks, and the cypris conserves energy by not feeding. When the cypris has found somewhere to settle it extends its antennae to the surface and secretes a cement-like substance. It then pulls itself to that surface and becomes permanently attached. After time it will eventually morph into its adult form.[http://www.absoluteastronomy.com/topics/Barnacle] | ||
== Ecology == | == Ecology == | ||
Barnacles are marine animals that live in both shallow and tidal waters.[http://en.wikipedia.org/wiki/Barnacles]The Barnacles are also suspension feeders that are sessile and feed on [[detritus]] and [[plankton]]. They use their net-like cirri to reach out into the water and back in a constant drum-like rhythm in order to capture food. | Barnacles are marine animals that live in both shallow and tidal waters.[http://en.wikipedia.org/wiki/Barnacles]The Barnacles are also suspension feeders that are sessile and feed on [[detritus]] and [[plankton]]. They use their net-like cirri to reach out into the water and back in a constant drum-like rhythm in order to capture food.[http://www.absoluteastronomy.com/topics/Barnacle] They can be found anywhere in the [[intertidal zone]] on just about any coast in the world.[http://www.wildsingapore.com/wildfacts/crustacea/othercrust/ciriipedia/cirripedia.htm] Also they can be found glued to just about any surface. These surfaces include ships, rocks, whales, plants, and docks.[http://library.thinkquest.org/J001418/barnacles.html] | ||
Their predators include [[sea stars]], [[sea snails]], some [[birds]], [[fish]] (Such as Sheephead), and [[worms]]. Also dangerous chemicals can harm the Barnacles. This can be toxic to barnacles when oil spills occur.[http://library.thinkquest.org/J001418/barnacles.html] [[Limpets]] and [[Mussels]] also invade and compete with the barnacles for space.[http://www.absoluteastronomy.com/topics/Barnacle] | Their predators include [[sea stars]], [[sea snails]], some [[birds]], [[fish]] (Such as Sheephead), and [[worms]]. Also dangerous chemicals can harm the Barnacles. This can be toxic to barnacles when oil spills occur.[http://library.thinkquest.org/J001418/barnacles.html] [[Limpets]] and [[Mussels]] also invade and compete with the barnacles for space.[http://www.absoluteastronomy.com/topics/Barnacle] | ||
