Invasion History

First Galapagos Record: 2015

General Invasion History:

The colonial tunicate Polyandrocarpa zorritensis was described from Zorritos, Peru in 1931 (Van Name 1945) in the southeastern Pacific. The next published collections were from the southeastern Atlantic, in Brazil, at Santos and Itacurussa (near Cananeia) (Millar 1958). The native region of this tunicate could be either the Southwest Atlantic or Southeast Pacific. However, this tunicate has become widely introduced, as it is found on the East and West coasts of North America, Hawaii, Japan, and the Mediterranean. In the Mediterranean and possibly elsewhere, its growth seems to be favored by eutrophication (Brunetti and Mastrototaro 2004).

Invasion History in the Galapagos:

In 2015 and 2016, Polyandrocarpa zorritensis was collected on fouling plates at several sites on Santa Cruz and Baltra Islands (Lambert 2019).

Invasion history elsewhere in the world:

In 1991, the tunicate was found in southern Japan, at Kitakyushu, Kyushu, on the East China Sea, and at Kochi, on Shikoku (Nishikawa et al. 1993, cited by Iwasaki (2006). Polyandrocarpa zorritensis has also invaded the western Mediterranean Sea. In 1975, it was detected in the harbor of La Spezia, Italy, on the Tyrrhenian Sea (Brunetti 1978). In 2001, it was found in the Gulf of Taranto, near the tip of the Italian Peninsula (2001, Brunetti and Mastrototaro 2004). In Spanish waters, P. zorritensis has been found in the delta of the Ebro River (Turon and Perrera 1998). 

Description

Polyandrocarpa zorritensis is a colonial tunicate, whose colonies consist of a crowded mass or cluster of club-shaped zooids. The zooids are connected at the base of the colony by a tangled mass of root-like stolons. Individual zooids have an oval cross-section (meaning they are slightly compressed from side to side; Van Name 1945) and are free at their anterior end. The anterior end is rounded or truncated, and the oral and atrial siphons have four lobes, with two dark bands per lobe (Brunetti and Mastrototaro, 2004). Each zooid has its own tunic, though tunics of adjacent individuals may adhere to each other. The tunics are thin, tough and can be densely encrusted with sand. Zooids are pale brown to yellowish green in color (Lambert and Lambert 1998) and are up to 20 mm long and 3.8 mm diameter (Van Name 1945).


Taxonomy

Taxonomic Tree

Kingdom:   Animalia
Phylum:   Chordata
Subphylum:   Tunicata
Class:   Ascidiacea
Order:   Stolidobranchia
Family:   Styelidae
Genus:   Polyandrocarpa
Species:   zorritensis

Synonyms

Stolonica zorritensis (Van Name, 1931)

Potentially Misidentified Species

Ecology

General:

Life History- A colonial (or compound) tunicate consists of many zooids, bearing many or all of the organs of a solitary tunicate, but modified to varying degrees for colonial life. Colonial tunicates of the genus Polyandrocarpa have zooids resembling solitary tunicates, rounded, oval, or club-like in shape. Zooids can be crowded together, but do not coalesce. Each zooid has an oral and atrial siphon. Water is pumped into the oral siphon, through finely meshed ciliated gills on the pharynx, where phytoplankton and detritus are filtered, and passed on mucus strings to the stomach and intestines. Excess waste is expelled in the outgoing atrial water (Van Name 1945; Barnes 1983). 
 
Colonial tunicates reproduce both asexually, by budding, and sexually, from fertilized eggs developing into larvae. Colonies vary in size and can range from small clusters of zooids to huge spreading masses. The zooids are hermaphroditic, with eggs and sperm being produced by a single individual. Eggs may be self-fertilized or fertilized by sperm from nearby animals, but many species have a partial block to self-fertilization. Depending on the life-history of the species, eggs may be externally or internally fertilized. Fertilized eggs hatch into a tadpole larva with a muscular tail, notochord, eyespots, and a set of adhesive papillae. The lecithotrophic (non-feeding, yolk-dependent) larva swims briefly before settlement. Swimming periods are usually less than a day, and some larvae can settle immediately after release, but the larval period can be longer at lower temperatures. Once settled, the tail is absorbed, the gill basket expands, and the tunicate begins to feed by filtering (Van Name 1945; Barnes 1983). 

Food:

Phytoplankton, detritus

Trophic Status:

Suspension Feeder

SusFed

Habitats

General HabitatMarinas & DocksNone
General HabitatVessel HullNone
General HabitatMangrovesNone
Salinity RangePolyhaline18-30 PSU
Salinity RangeEuhaline30-40 PSU
Tidal RangeSubtidalNone
Vertical HabitatEpibenthicNone

Life History


Tolerances and Life History Parameters

Minimum Temperature (ºC)12Field, Mediterranean Sea (Brunetti, pers. comm., cited by Lambert and Lambert 1998)
Maximum Temperature (ºC)30Field, Mediterranean Sea (Brunetti, pers. comm., cited by Lambert and Lambert 1998)
Minimum Salinity (‰)22.7Field, Mediterranean Sea (Brunetti, pers. comm., cited by Lambert and Lambert 1998)
Maximum Salinity (‰)38Field, Mediterranean Sea (Brunetti, pers. comm., cited by Lambert and Lambert 1998)
Minimum Reproductive Salinity26Salinities below 26 PSU halted the swimming of larvae (Vazquez and Young 1998)
Maximum Duration0.2Larvae, Laboratory observations (Vazquez and Young 1998)
Broad Temperature RangeNoneWarm temperate-Tropical
Broad Salinity RangeNonePolyhaline-Euhaline

General Impacts

Economic Impacts-

Polyandrocarpa zorritensis was reported to overgrow cultured oysters (Crassostrea gigas) in the Ebro Delta, Spain (Perrera et al. 1990, cited by da Rocha et al. 2009).

Ecological impacts-

Polyandrocarpa zorritensis formed 100% cover in several locations in San Diego and Mission Bays in 1994–2000, suggesting it is capable of outcompeting native and other introduced fouling species (Lambert and Lambert 2003).


Regional Distribution Map

Bioregion Region Name Year Invasion Status Population Status
SEP-Z 2015 Def Estab

Occurrence Map

OCC_ID Author Year Date Locality Status Latitude Longitude

References

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