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Dreissena polymorpha

(Zebra Mussel)

Overview

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Mollusc. Zebra mussels are native to the Caspian and Black Seas . They are now established in the UK, Western Europe, Canada and the USA. They compete with zooplankton for food, thus affecting natural food webs . They also interfere with the ecological functions of native molluscs and cause great economic damage.

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

Zebra Mussel, Racicznica Zmienna, Wandering Mussel

Common Names in French:

Moule Zebra

Common Names in German:

Zebra-Muschel

Description

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Physical Description

Species Dreissena polymorpha

Black or brown and white striped bivalve mollusc with byssal attachment to hard substrates. Maximum size approx. 3 cm long. Shell is highly carinate , having an angle between the ventral and dorsal surfaces. Color patterns highly polymorphic , from almost pure black to unpigmented, with a variety of striped forms.

Habitat

Tolerates salinity to 6 ppt, temperatures to approx. 29 C, will not settle in currents greater than 2 m/sec.

Typically found in a lake at a mean distance from sea level of 8 meters (25 feet).[1]

Ecology: This species occurs in a range of habitats , from freshwater to oligohaline waters in rivers , estuaries and coastal shallows of the Caspian Sea and other large brackish lakes (Therriault et al. 2004). In introduced regions, it has been found at depths of greater than 60 m (Therriault et al. 2004). It is most abundant on hard surfaces in calm waters upstream of dams (Birnbaum 2006).

Due to its bio-fouling properties (especially of ship hulls and industrial intake pipes, Birnbaum 2006) this species has had strong negative economic consequences in countries to where it has spread . It also has ecosystem-level impacts , including outcompeting native taxa, slowing down eutrophication, and bio-deposition, although these seem to manifest themselves towards the beginning of an invasion (Birnbaum 2006).[2].

List of Habitats:

Biology

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Reproduction

Zebra mussels are dioecious and fertilize externally; larvae are planktonic for several weeks before settling and attaching to substrateEstimated at up to 1.5 million eggs per female per year; survival to adult stage may be less than 1%.

Fertilized egg hatches into trocophore (40-60 microns, 1-2 days), several stages of free-swimming planktonic veliger lasting 8-180 days (or longer in cold water ), then at 350 micron size the larvae settle as plantigrade mussels, attach to substrate as juveniles , and may mature within the first year of life under optimal conditions; maturity in the second year is more usual. Zebra mussels live 3-5 years.

Taxonomy

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Synonyms

Mytilus polymorphus

Notes

Name Status: Accepted Name .

Last scrutiny: 17-Oct-2001

A molecular phylogenetic analysis, using 16S and COI sequence data , maintained this as a separate species distinct from other closely related ones, e.g. , D. rostriformis and D. stankovici (Therriault et al. 2004).[2].

Similar Species

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Members of the genus Dreissena

ZipcodeZoo has pages for 2 species and subspecies in this genus:

D. bugensis (Quagga Mussel) · D. polymorpha (Zebra Mussel)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal December 06, 2007:

Identifiers

Footnotes

  1. Standard Deviation = 46.000 based on 1,915 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
  2. Van Damme, D. 2011. Dreissena polymorpha. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 31 January 2012. [back]
Last Revised: 7/14/2012