Barnacle ist. die englische Bezeichnung für Rankenfußkrebse (Cirripedia); Barnacle Goose, die englische Bezeichnung der Weißwangengans (Branta. Übersetzungen für barnacle im Englisch» Deutsch-Wörterbuch von PONS Online:barnacle, goose barnacle, acorn barnacle. Viele übersetzte Beispielsätze mit "barnacle" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen.
Typically, recently moulted hermaphroditic individuals are receptive as females. Self-fertilization, although theoretically possible, has been experimentally shown to be rare in barnacles.
The sessile lifestyle of barnacles makes sexual reproduction difficult, as the organisms cannot leave their shells to mate.
Barnacles probably have the largest penis to body size ratio of the animal kingdom. Barnacles can also reproduce through a method called spermcasting, in which the male barnacle releases his sperm into the water and females pick it up and fertilise their eggs.
Most barnacles are suspension feeders; they dwell continually in their shells, which are usually constructed of six plates,  and reach into the water column with modified legs.
These feathery appendages beat rhythmically to draw plankton and detritus into the shell for consumption. Other members of the class have quite a different mode of life.
For example, members of the superorder Rhizocephala , including the genus Sacculina , are parasitic and live within crabs.
Since the intertidal zone periodically desiccates , barnacles are well adapted against water loss. Their calcite shells are impermeable, and they possess two plates which they can slide across their apertures when not feeding.
These plates also protect against predation. Barnacles are displaced by limpets and mussels , which compete for space. They also have numerous predators.
In the swamping strategy, vast numbers of barnacles settle in the same place at once, covering a large patch of substrate, allowing at least some to survive in the balance of probabilities.
Competitors may include other barnacles, and disputed evidence indicates balanoid barnacles competitively displaced chthalamoid barnacles.
Balanoids gained their advantage over the chthalamoids in the Oligocene, when they evolved tubular skeletons, which provide better anchorage to the substrate, and allow them to grow faster, undercutting, crushing, and smothering the latter group.
Among the most common predators on barnacles are whelks. They are able to grind through the calcareous exoskeletons of barnacles and feed on the softer inside parts.
Mussels also prey on barnacle larvae. Barnacles and limpets compete for space in the intertidal zone. Underside of large Chesaconcavus sp.
Miocene showing internal plates in bioimmured smaller barnacles. The anatomy of parasitic barnacles is generally simpler than that of their free-living relatives.
They have no carapace or limbs, having only unsegmented sac-like bodies. Barnacles were originally classified by Linnaeus and Cuvier as Mollusca , but in John Vaughan Thompson published observations showing the metamorphosis of the nauplius and cypris larvae into adult barnacles, and noted how these larvae were similar to those of crustaceans.
In Hermann Burmeister published further information, reinterpreting these findings. The effect was to move barnacles from the phylum of Mollusca to Articulata , showing naturalists that detailed study was needed to reevaluate their taxonomy.
Charles Darwin took up this challenge in , and developed his initial interest into a major study published as a series of monographs in and Some authorities regard the Cirripedia as a full class or subclass , and the orders listed above are sometimes treated as superorders.
In , Martin and Davis placed Cirripedia as an infraclass of Thecostraca and divided it into six orders: Infraclass Cirripedia Burmeister , Trace fossils of acrothoracican barnacle borings Rogerella are common in the fossil record from the Devonian to the recent.
Barnacles can play an important role in estimating paleo-water depths. The degree of disarticluation of fossils suggests the distance they have been transported, and since many species have narrow ranges of water depths, it can be assumed that the animals lived in shallow water and broke up as they were washed down-slope.
The completeness of fossils, and nature of damage, can thus be used to constrain the tectonic history of regions.
Balanus improvisus , one of the many barnacle taxa described by Charles Darwin. Miocene Messinian Megabalanus , smothered by sand and fossilised.
Particularly in the case of ships, they are classified as fouling organisms. The stable isotope signals in the layers of barnacle shells can potentially be used as a forensic tracking method for whales , loggerhead turtles and marine debris , such as shipwrecks or a flaperon suspected to be from Malaysia Airlines Flight Some barnacles are considered edible by humans, including Japanese goose barnacles e.
Capitulum mitella , and goose barnacles e. Pollicipes pollicipes , a delicacy in Spain and Portugal. Indeed, the word "barnacle" originally referred to a species of goose, the barnacle goose Branta leucopsis , whose eggs and young were rarely seen by humans because it breeds in the remote Arctic.
Additionally, the picoroco barnacle is used in Chilean cuisine and is one of the ingredients in curanto. Barnacles slowly reclaim pilings along the Siuslaw River in Oregon.
Gooseneck barnacles being enjoyed in a Spanish restaurant in Madrid. From Wikipedia, the free encyclopedia. For other uses, see Barnacle disambiguation.
The World of Animals. Their physiology and role in the control of behavior". BMC Biology , 7: The Light and Smith Manual: Intertidal Invertebrates from Central California to Oregon 4th ed.
University of California Press. Invertebrate Zoology, 7th edition. Structure, Function, Development and Evolution.
Archived from the original on February 17, Retrieved April 20, Sexuality and hermaphroditism in barnacles: A natural selection approach.
Encarta Encyclopedia DVD. Central Connecticut State University. Hat jemand ein… 14 Replies. In need of language advice? Get help from other users in our forums.
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