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The Global Spread of the Chinese Mitten Crab Eriocheir sinensis

  • Matt G. Bentley
Chapter
Part of the Invading Nature - Springer Series in Invasion Ecology book series (INNA, volume 6)

Abstract

Chinese mitten crabs are one of the World’s most notorious aquatic invasive species. Their catadromous life history, in which they spend most of their lives growing to maturity in freshwater, and their extreme euryhalinity, has made it relatively easy for the species to gain a foothold in the World’s river systems. Ballast water introductions are thought to have brought them to continental Europe in the early twentieth century. These will have probably been as larvae, which will then have settled in the estuaries subsequently moving upstream as juveniles. The capacity of these crabs to move upstream (and over land) is staggering and individuals in their native range in the Far East have been found more than 1,000 km from the sea, where they must return to breed.

A number of successful separate introductions of mitten crabs have taken place in Europe, including the UK and America. Europe (Northern Germany) saw initial introductions in 1912, followed by others into both the North Sea coasts and English Channel coasts of France. The extensive network of Northern European waterways facilitated the spread in river systems. After a lag phase, which is typical of many invasive species following introduction, numbers of mitten crabs increased dramatically such that by 1936 attempts at removing the animals from rivers in Germany were abandoned; some 220 metric tonnes were removed from the River Weser alone in that year. Introductions into the UK (River Thames) followed in the mid-1930s but initial introductions appear not to have founded a population. It was not until 1970s that mitten crabs numbers increased and the Thames population became established, and it has subsequently increased and spread. The crab had spread rapidly both around UK coasts and up river systems by the end of the twentieth century and into the 1st decade of the 21st. Evidence suggests that there have been several separate introductions in France; the first in Northern France and then subsequently into western France.

Whilst the most likely and common route of introduction is via discharge of ships’ ballast water, it is possible that there may have already been and may also be future deliberate introductions. The mitten crab has considerable economic value and is farmed in the Far East. Introductions into San Francisco Bay area of the USA later in the twentieth century may have been a deliberate attempt to create a fishery for the species. In its native range, the mitten crab carries a lung fluke trematode parasite Paragonimus westermani that infects humans. The intermediate host for P. westermani is a snail of the genus Semisulcospira, which is not present in the USA and Northern Europe. This means that mitten crabs in these areas are likely to remain parasite free. Whatever the route of entry, the crab has become a major problem in the San Francisco Bay area as it interferes with other fishery activities and causes significant habitat modification. The large crab is a burrowing species creating long burrows in soft river banks causing siltation of the waterways, bank erosion and increasing the risk of flooding. These habitat effects are likely to be apparent wherever the crab is well established. The global spread of Eriocheir sinensis continues. In the UK, for example, it has extended its range to the river systems of South-West England, the Welsh River Dee and the River Mersey (North-West England) and has reached as far north as the River Tyne in northeast England. The crab has not yet been reported from further north in England and is so far absent in Scotland. In the USA, it has recently been found along the Atlantic seaboard around Chesapeake Bay, and it appears almost inevitable that many more estuaries and river systems around the globe will become host to the Chinese mitten crab.

Keywords

Invasive Species Ballast Water Zoeal Stage Aquatic Invasive Species Chinese Mitten Crab 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

I would like to acknowledge the award of a Swales Studentship from the Faculty of Agriculture and Biological Science (now part of the Faculty of Science, Agriculture and Engineering), at Newcastle University which supported Leif-Matthias Herborg during his PhD studies. I am grateful for additional research funding for the project from the Esmée Fairbairn Foundation and from The John Ray Trust. I would also like to acknowledge Matthias himself for being an excellent research student. I would like to thank Tony Clare, who co-supervised the mitten crab work. I am grateful to Paul Clark of the Natural History Museum London for assistance in obtaining live mitten crabs for the laboratory research has part of Matthias’ project and to David Whitaker for assisting with the provision and maintenance of research aquarium facilities in Newcastle. I thank Becky Seeley and Stuart Higgs for providing recent data on UK mitten crab sightings. Thanks are also due to Steve Rushton who gave immense support on the modelling aspects of mitten crab spread in the UK and Europe. Finally, I should like to thanks my wife, Alison for assistance with preparation of some of the figures and for casting her experienced editorial eye over the manuscript.

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© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.School of Marine Science and TechnologyNewcastle UniversityNewcastle upon TyneUK

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