Articles on this page are available in 1 other language: Dutch (1) (learn more)

Overview

Brief Summary

As opposed to the acorn barnacle, bay barnacles can also survive in brackish water. They didn't originally belong to the original Dutch fauna. They probably arrived in the North Sea attached to a ship arriving from the eastern shores of the United States. Or possibly attachted to a whale. This is often how a small animal travels a long distance without exerting any effort. When Australasian barnacles inhabit the same area where bay barnacles already live, then the bay barnacle is often the weaker of the two and is displaced.
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Copyright Ecomare

Source: Ecomare

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Ecology

Habitat

Depth range based on 195 specimens in 1 taxon.
Water temperature and chemistry ranges based on 10 samples.

Environmental ranges
  Depth range (m): -99 - 774.5
  Temperature range (°C): 5.693 - 23.384
  Nitrate (umol/L): 0.437 - 30.755
  Salinity (PPS): 6.151 - 36.162
  Oxygen (ml/l): 2.846 - 8.227
  Phosphate (umol/l): 0.138 - 2.003
  Silicate (umol/l): 0.942 - 28.168

Graphical representation

Depth range (m): -99 - 774.5

Temperature range (°C): 5.693 - 23.384

Nitrate (umol/L): 0.437 - 30.755

Salinity (PPS): 6.151 - 36.162

Oxygen (ml/l): 2.846 - 8.227

Phosphate (umol/l): 0.138 - 2.003

Silicate (umol/l): 0.942 - 28.168
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Balanus improvisus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Wikipedia

Balanus improvisus

Amphibalanus improvisus, the bay barnacle, is a species of acorn barnacle in the family Balanidae.

Description[edit]

Amphibalanus improvisus has a smooth white or pale grey conical calcareous shell composed of six fused plates. There is an oval or rhombic opening at the top which is blocked by two hinged plates.[2] Adults usually grow to about 10 mm (0.4 in) in diameter and 6 millimetres (0.24 in) in width though they are sometimes larger than this and can grow taller when densely packed. The base is characteristically grooved radially. This species can be confused with the striped barnacle (Amphibalanus amphitrite) [3] and in European waters with the northern rock barnacle (Semibalanus balanoides) or the rock barnacle (Balanus crenatus).[4]

Distribution[edit]

Bay barnacles in the Sea of Azov, Ukraine

Amphibalanus improvisus has a cosmopolitan distribution and is found in temperate and tropical parts of the Atlantic Ocean, the Arctic Ocean, the Baltic Sea the North Sea, the Mediterranean Sea and the Black Sea. It is not known where the species natural range lies but it may have originated in North America. It has colonised many parts of the world's oceans including the Indo-Pacific and Australasia as a biofouling agent on the hulls of ships.[2] It was one of the first recorded introductions to the Baltic Sea, having been found in Sweden and Lithuania in 1844, the Elbe estuary in 1854 and Great Britain in the 1880s.[4]

Habitat[edit]

Amphibalanus improvisus is found, sometimes in vast numbers, down to a depth of about 6 metres (20 ft) on rocks, man made structures, buoys, ships' hulls, the shells of crabs and molluscs, and certain seaweeds. It has been known to block the water intake pipes of factories and power stations. It is tolerant of both high and low salinity levels and is often found in estuaries and low salinity bays. As an invasive species it competes with native organisms and it is an unwanted coloniser of the shells of cultivated oysters and mussels and aquaculture cages.[4][5]

Biology[edit]

Live barnacles on a shell with the small hermit crab (Diogenes pugilator)

Amphibalanus improvisus is a filter feeder. It extends its six pairs of modified legs called cirri to catch plankton and other organic material floating past. It is a hermaphrodite and sperm is passed into the cavity of a neighbouring barnacle through a long penis. The eggs are fertilised and brooded in the cavity and hatch into nauplius larvae which drift with the currents. After six naupliar stages occupying two to five weeks, these become cyprid larvae and find a suitable surface on which to settle. Here they cement themselves to the substrate and undergo metamorphosis into juveniles. There may be several broods in the year but usually just two in the cooler waters of the Baltic and only one in low salinity environments.[5][6]

References[edit]

  1. ^ "Balanus improvisus Darwin, 1854". Integrated Taxonomic Information System. 
  2. ^ a b WoRMS (2009). "Amphibalanus improvisus Darwin, 1854". World Register of Marine Species. Retrieved August 14, 2014. 
  3. ^ Sweat, L. H. (2009). "Balanus eburneus". Smithsonian Marine Station at Fort Pierce. Retrieved 2012-10-04. 
  4. ^ a b c "Bay barnacle (Balanus improvisus)" (PDF). Främmande arter i svenska hav. Retrieved April 18, 2010. 
  5. ^ a b "Balanus improvisus (Darwin 1854), Balanidae, Cirripedia". Exotics Across the Ocean - EU Concerted Action. Retrieved 2012-10-04. 
  6. ^ Dorit, R. L.; Walker, W. F.; Barnes, R. D. (1991). Zoology. Saunders College Publishing. p. 742. ISBN 0-03-030504-7. 
Creative Commons Attribution Share Alike 3.0 (CC BY-SA 3.0)

Source: Wikipedia

Unreviewed

Article rating from 0 people

Default rating: 2.5 of 5

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!