Invasion History

First Non-native Panama (Pacific) Tidal Record: 1972

Panama Invasion History:


Invasion history elsewhere in the world:

Diadumene leucolena was collected in 1962 from La Parguera, Puerto Rico (in 1962, YPM 7652, Yale Peabody Museum 2008). We do not know whether this anemone is established in Puerto Rico or elsewhere in the Caribbean. In the Eastern Atlantic, D. leucolena was found in tide pools at Fuerteventura, in the Canary Islands (in 1994, Ocaña and den Hartog 2002. 'only in mesolittoral pools'). It is also known from Cameroon (as Diadumene kameruniensis, Carlgren 1927, cited by Ocaña and den Hartog 2002), Morocco, and Senegal (Ocaña and den Hartog 2002). These records are most likely due to transport by ship fouling.

In the Pacific, D. leucolena was reportedly abundant in a rocky intertidal community at Paitilla Beach, Panama City, near the Pacific end of the Panama Canal (in 1972, Reimer 1976).


Description

Diadumene leucolena has a column which appears smooth from a distance, but is studded with small dark bumps when looked at closely. When extended, the column of the polyp is 2-5X the width. Some specimens reach 38 mm in height and 12 mm in width. This anemone has acontia, threadlike structures, lined with cnidocytes (cells bearing nematocysts) which extend from the middle lobes of incomplete mesenteries, which partially divide the gastrovascular cavity. The acontia can be extended into the body cavity, or extruded through pores, as a defense in response to disturbance or handling. There are 40-60 tentacles, and there is a substantial tentacle-free zone around the mouth. The tentacles are long and slender when extended. This anemone is usually whitish and translucent, tinted with pale pink, orange, or olive (description from: Gosner 1978; Carlton 1979; Cohen and Carlton 1995; Fautin, in Carlton 2007).


Taxonomy

Taxonomic Tree

Kingdom:   Animalia
Phylum:   Cnidaria
Class:   Anthozoa
Subclass:   Zoantharia
Order:   Actiniaria
Suborder:   Thenaria
Family:   Diadumenidae
Genus:   Diadumene
Species:   leucolena

Synonyms

Cylista leucolena (Verrill, 1866)
Diadumene kameruniensis (Carlgren, 1927)
Sagartia leucolena (Verrill, 1866)

Potentially Misidentified Species

Diadumene lineata
None

Diadumene sp. 1
None

Ecology

General:

Most sea anemones of the genus Diadumene can reproduce sexually by releasing eggs and sperm into the water, and asexually by longitudinal fission, or by a method called pedal laceration. In pedal laceration, as the anemone moves, a portion of its base is left behind, and grows into a new anemone (Barnes 1983). However, in D. leucolena, asexual reproduction appears to be rare or absent, at least in native populations in East Coast estuaries (Shick and Lamb 1977). Shick and Lamb (1977) suggest that the dominance of sexual reproduction and genetic variation helps the persistence of populations during highly variable conditions, which may completely wipe out clonal populations, such as those of the asexual D. lineata. Hand (1956) suggested that this was also true for West Coast D. leucolena, based on the regular arrangement of the mesenteries, which is disrupted during longitudinal fission.

This anemone is known from estuaries and sheltered waters, where it grows on oysters, rocks, seaweeds, pilings, and floats (Gosner 1978; Carlton 1979; Cohen and Carlton 1995; Casey 1997; Cohen 2005). It can also occur in sheltered tide pools, especially those receiving some freshwater inflow (Fofonoff, personal observations). It is especially tolerant of variable salinity and occurs at salinities as low as 6-7 PSU (Pierce and Minasian 1974; Shick and Lamb 1977; Gosner 1978; Casey 1997). Like other anemones, it feeds by trapping zooplankton and small epibenthic animals with its tentacles (Barnes 1983).

Food:

Zooplankton, small epibenthos

Trophic Status:

Carnivore

Carn

Habitats

General HabitatCoarse Woody DebrisNone
General HabitatOyster ReefNone
General HabitatMarinas & DocksNone
General HabitatRockyNone
Salinity RangeMesohaline5-18 PSU
Salinity RangePolyhaline18-30 PSU
Salinity RangeEuhaline30-40 PSU
Tidal RangeSubtidalNone
Tidal RangeLow IntertidalNone
Vertical HabitatEpibenthicNone


Tolerances and Life History Parameters

Minimum Temperature (ºC)0None
Minimum Salinity (‰)7Field observations, Pettaquamscutt River RI, Paul Fofonoff, personal observation
Maximum Salinity (‰)33None
Minimum Duration5Planula larvae were planktonic for at 'least 5 days' at 17.5 C and 25 PSU (Shick and Lamb 1977).
Broad Temperature RangeNoneCold temperate-Tropical
Broad Salinity RangeNoneMesohaline-Euhaline

General Impacts

Diadumene leucolena has no reported impacts in its introduced range.

Regional Distribution Map

Bioregion Region Name Year Invasion Status Population Status
PAN_PAC Panama Pacific Coast 1972 Def Estab

Occurrence Map

OCC_ID Author Year Date Locality Status Latitude Longitude
5318 Reimer 1976 1972 1972-01-31 Paitilla Beach Def 8.9500 -79.5667

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