Overview

Brief Summary

Found clustered against the surfaces of craggy rocks and roughened shells, Balanus balanus is a cold-water species of barnacle that can measure up to 5cm in diameter. Greyish-white in color, B. balanus is primarily identified by its steeply conical shell, deep longitudinal ridges, strongly beaked tergum, and yellow opercular membrane. This hearty crustacean prefers to dwell in waters above 150m deep and often shares its habitat with other barnacles of the same Family.

  • Andrew Hosie 2008. Balanus balanus. An acorn barnacle. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 15/11/2011].
  • Barnes, H., and Margaret Barnes. "The General Biology of Balanus Balanus (L.) Da Costa." Oikos 5.1 (1954): 63-76. Http://jstor.org. Ithaka. Web. 21 Nov. 2011. .
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Distribution

This species is mainly an arctic boreal deepwater species, although it can occur into the lower third of the intertidal zone. Its distribution encloses the North Atlantic and North Pacific.
  • Kerckhof, F. (2002). Barnacles (Cirripedia, Balanomorpha) in Belgian waters, an overview of the species and recent evolutions, with emphasis on exotic species. Bull. Kon. Belg. Inst. Natuurwet. Biologie 72(Suppl.): 93-104
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Arctic to Cape Cod
  • North-West Atlantic Ocean species (NWARMS)
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Ecology

Habitat

intertidal, bathyal, infralittoral and circalittoral of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
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Depth range based on 213 specimens in 1 taxon.
Water temperature and chemistry ranges based on 46 samples.

Environmental ranges
  Depth range (m): -3 - 164.6
  Temperature range (°C): -1.315 - 12.270
  Nitrate (umol/L): 0.897 - 14.548
  Salinity (PPS): 27.165 - 35.352
  Oxygen (ml/l): 5.303 - 8.585
  Phosphate (umol/l): 0.094 - 1.607
  Silicate (umol/l): 2.315 - 24.717

Graphical representation

Depth range (m): -3 - 164.6

Temperature range (°C): -1.315 - 12.270

Nitrate (umol/L): 0.897 - 14.548

Salinity (PPS): 27.165 - 35.352

Oxygen (ml/l): 5.303 - 8.585

Phosphate (umol/l): 0.094 - 1.607

Silicate (umol/l): 2.315 - 24.717
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Balanus balanus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 62
Species With Barcodes: 1
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Wikipedia

Balanus balanus

Balanus balanus is a species of acorn barnacle in the Balanidae family. It is native to the colder seas of the northern hemisphere.

Contents

Description

Unlike most crustaceans, barnacles are unable to move from place to place. Cement glands near the base of the antennae fix them to the rock. The carapace of this species is conical with a circular base which has an irregular edge and a diameter of up to three centimetres. The surface is ridged and white or pale brown. The cover plates protecting the opening are shaped like the beak of a bird.[2]

Ecology

This species is found at depths of up to 60 metres (200 ft) and grows on bedrock, boulders, pebbles and shells. It seems to favour habitats with strong currents and when overcrowding occurs, adopts different shapes to fit the space available. It is often found growing alongside another barnacle, Balanus crenatus. Other species often found in its vicinity include Tubularia larynx, Obelia geniculata, Pomatoceros triqueter, Pecten maximus, Hydroides norvegica, Chlamys opercularis and Sertularia species. Coralline algae was often present as were the whelk, the European edible sea urchin (Echinus esculentus), the great spider crab (Hyas araneus) and the shore crab (Carcinus maenas).[3]

The main predator is the juvenile common starfish (Asterias rubens). Medium sized barnacles seem to be at greatest risk. Small specimens are ignored while large specimens seem able to withstand attack.[4]

Distribution

Balanus balanus is found in the Arctic Ocean and the more northerly seas of the northern hemisphere. It has been introduced to Argentina where it is displacing other species and is considered invasive.

Biology

Larvae settle out of the zooplankton in about April and attach themselves to objects on the sea floor. The newly metamorphosed cyprid develops slowly reaching 1 millimetre (0.039 in) diameter in a few weeks and 7 mm (0.28 in) by September. The growth rate then slows over the winter so that the year old barnacle averages 8 mm (0.31 in). Thereafter it grows at 5–10 mm (0.20–0.39 in) a year and the largest specimens, 30–40 mm (1.2–1.6 in) across are probably four to six years old. Under experimental conditions of total submersion growth is faster and more nearly resemble growth rates of Semibalanus balanoides and Balanus crenatus. This may be because these barnacles, being always under water, have a greater continuity of food supply. There is a wide variation in rate of growth and the factors affecting it include currents and nutrient content. A scarcity of diatoms in mid-summer may slow growth at this time.[3]

B. balanus is a cross-fertilising hermaphrodite and the single brood of nauplii is produced in the middle of winter. In mature individuals (barnacles at least ten millimetres in diameter) the white vesiculae seminales are very much enlarged at this time and filled with spermatozoa, occupying much of the body cavity and the penis is also greatly enlarged. At the same time, a creamy mass of eggs are present in the ovarian tubules. Fertilisation takes place over the course of a few days in each group of barnacles and the fertilised eggs change to an orange colour and then to a greyish-brown as the nauplii develop. New ovaries begin to form soon after fertilisation, and the testes re-develop during the summer with the size of the penis being reduced. After about forty days of embryonic development, the nauplii are liberated into the water. Many first year specimens are not fully mature in their first winter but those that are liberate 3,000 to 4,000 nauplii. Second year individuals at an average size of twenty millimetres will produce about 20,000 nauplii, whilst larger individuals of thirty millimetres may produce over 100,000.[3]

The nauplii feed, moult five times and swim with their antennae. It takes about one month for them to develop into the cyprid larvae, the non-feeding stage before adulthood.[5]

References

  1. ^ "Balanus balanus (Linnaeus, 1758)". Encyclopedia of Life. April 13, 2011. http://www.eol.org/pages/339615. Retrieved May 5, 2011.
  2. ^ Kåre Telnes (April 14, 2011). "Barnacle – Balanus balanus". The Marine Flora & Fauna of Norway. http://www.seawater.no/fauna/arthropoda/balanus.html. Retrieved May 5, 2011.
  3. ^ a b c H. Barnes & Margaret Barnes (1954). "The general biology of Balanus balanus (L.) Da Costa". Oikos 5 (1): 63–76. JSTOR 3564651. 
  4. ^ H. Barnes & H. T. Powell (1951). "The growth rate of juvenile Asterias rubens L." (PDF). Journal of the Marine Biological Association of the United Kingdom 30 (2): 381–385. doi:10.1017/S0025315400012844. 
  5. ^ William A. Newman (2007). "Cirripedia". In Sol Felty Light & James T. Carlton. The Light and Smith Manual: Intertidal Invertebrates from Central California to Oregon (4th ed.). University of California Press. pp. 475–484.
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