Amphibalanus reticulatus

Invasion History

First Non-native Panama (Pacific) Tidal Record: 1985
First Non-native Panama (Caribbean) Tidal Record: 1965

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Panama Invasion History:

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Invasion history elsewhere in the world:

Amphibalanus reticulatus is now established from the coast of Panama, north to Mazatlan, Mexico (Laguna 1985) and La Paz, on the Gulf of California (Carlton et al. 2011). It was collected at the Pacific entrance to the Panama Canal, suggesting that the likely invasion route is shipping (Laguna 1985). This barnacle has a broad Indo-Pacific distribution, and has been treated variously as native (Jones 1992) or introduced (Jones 2004) in Australian waters. It is introduced in Pago Pago harbor, American Samoa (Coles et al. 2003).

This barnacle entered the Mediterranean, presumably through the Suez Canal by 1956, and is established in Israel (Henry and McLaughlin 1975; Galil 2007). It has been found on ships in Mediterranean France (in 1967, Zibrowius 1991) and in Belgium (in 1999, Kerckhof and Cattrijsse 2001). In the tropical East Atlantic, it is known from Fajara, the Gambia, Freetown, Sierra Leone and Lagos, Nigeria (Stubbings 1967, cited by Henry and McLaughlin 1975; Kerckhof et al. 2010). In the western Atlantic, after A. reticulatus was first collected in Puerto Rico in 1956, it was found in Trinidad in 1965 (Henry and McLaughlin 1975), and then near the eastern entrance of the Panama Canal (Southward 1975; Spivey 1976). It was first collected in Brazil in 1990 at Recife and was found in 1996 in Rio de Janeiro state (Ferreira et al. 2009). It now occurs in six Brazilian states, Maranhao, Rio Grande do Norte, Pernambuco, Alagoa, Bahia, and Rio de Janeiro (Farrapeira 2010).

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Description

Amphibalanus reticulatus usually has a conical or subcylindrical shell, with a toothed orifice. The width of the orifice is usually more than ½ of its height. The plates have a smooth surface, with wide longitudinal spaces (radii), crossed by transverse stripes, giving a net-like appearance, with the ribs narrowing to the tops of the shell plates. The adductor ridge, on the interior face of the scutum is short and high. The tergum has a more pointed apex than A. amphitrite or A. improvisus. The tergal spur is narrow, and the spur length is about 3/10 the length of the basal margin. The spur width is about 1/4 of the basal margin (Henry and McLaughlin 1975). The shell is usually buff or white in color, with dark-purple longitudinal stripes, crossed by many alternating red-and-white transverse lines. Type specimens averaged 18 mm diameter (Henry and McLaughlin 1975). The larval stages of A. reticulatus are described by Thiyagarjan et al. (1997).

Amphibalanus reticulatus is a member of the Amphibalanus amphitrite species complex and can easily be confused with A. amphitrite, A. eburneus, A. ienustus, A. variegatus, A. subalbidus, and other closely related species (Henry and McLaughlin 1975).

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Taxonomy

Ecology

General:

Amphibalanus reticulatus prefers saline (30-40 PSU), subtidal habitats in subtropical and tropical seas, although it has been found at sailintiies as low as 10 PSU. It is typically found in sheltered and exposed waters on a wide range of hard surfaces, including docks, pilings, floats, mangroves, rocks, ships' hulls, oysters, and other shellfish (Henry and McLaughlin 1975; Jones 1992; Farrapeira 2008) This species, like many other barnacles, is hermaphroditic, but is capable of cross-fertilization. The fertilized eggs are brooded in the mantle cavity, sometimes for several months, and are released as nauplius larvae with three pairs of appendages. The nauplii feed in the plankton and go through five successive molts, spending at least 4-5 days in the water column before molting into a non-feeding cypris stage, covered with a pair of chitinous shells. Cyprids swim, investigating suitable surfaces, and then settle, secreting a shell, and molting into the first juvenile barnacle stages. Juvenile and adult barnacles are filter feeders, sweeping the water with their long bristled appendages, and gathering phytoplankton, zooplankton, and detritus (Barns 1983).

Food:

Phytoplankton; zooplankton

Consumers:

Crabs, snails, fishes

Trophic Status:

Suspension Feeder

SusFed

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Habitats

General Habitat	Coarse Woody Debris	None
General Habitat	Oyster Reef	None
General Habitat	Marinas & Docks	None
General Habitat	Rocky	None
General Habitat	Vessel Hull	None
General Habitat	Mangroves	None
Salinity Range	Polyhaline	18-30 PSU
Salinity Range	Euhaline	30-40 PSU
Tidal Range	Subtidal	None
Tidal Range	Low Intertidal	None

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Tolerances and Life History Parameters

Minimum Salinity (‰)	10	Field salinity, Paripe River estuary, Brazil (Farrapeira 2008)
Maximum Salinity (‰)	40	Larval (cypris) settlement, 28 C (Thiyagarjan et al. 2002)
Minimum Reproductive Salinity	20	Larval (cypris) settlement, 28 C (Thiyagarjan et al. 2002)
Maximum Reproductive Salinity	40	Larval (cypris) settlement, 28 C (Thiyagarjan et al. 2002)
Minimum Duration	5	26 C, from larval release to cypris (settling stage) (Thiyagarajan et al. 1997)
Maximum Width (mm)	26	Maximum adult width (Henry and McLaughlin 1975)
Maximum Height (mm)	15	Maximum adult height (Henry and McLaughlin 1975)
Broad Temperature Range	None	Warm temperate-Tropical
Broad Salinity Range	None	Polyhaline-Euhaline

General Impacts

Economic Impacts

Amphibalanus reticulatus is a frequent fouler of ships and marine structures worldwide in warm subtropical-tropical waters (Utinomi 1970; Henry and McLaughlin 1975).

Ecological Impacts

Competition- Amphibalanus reticulatus may have replaced or excluded A. amphitrite on the coast of Louisiana (Gittings et al. 1986) and in Hawaiian waters, before it was restricted by the invasion of Chthamalus proteus (Zabin 2009). However, to our knowledge, competitive relationships of A. amphitrite and A. reticulatus have not been studied.

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