ISSN: 1173-59.88 C T E T S ~ --- ~.T? ~ ~ ~ Tff;: !J~ Belarus
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Jnvasive of the IUCN Species Survival Commission §d ~ ~ \ / NUMBER 5 / 1997 Invasives experts and IUCN Invasives SpeciesSpecialist Group mem- bers worldwide .ares~eing some of their work and id~as being com- municated on a global scale,in the form of the 21-page draft document "Guidelines for the Prevention of Biodiversity Loss due to Biological Invasion". This document was compiled after extensive consultation with mem- bers, and also with those who attended the Norway /United Nations Trondheim Conference on Alien Speciesin July 1996.The guidelines~ are designed to help governments meet their obligations under article 8(h) of the Conv~ntion on BiologicalDiversity to redl}ce the risks of biodiversity loss caused by alien species. In October 1996,since Issue 4 of Aliens, many of the people involved met at the IUCN World Congress in Montreal, Canada, where the draft guidelines were presented and discussed. Further peer review is required on the document, before it issubmit- ted to IUCN for final ratification. The document is available for reading on the rutN website at: http:/ /www.iucn.org/themes/ssc/index.htm {under "of interest to members':) and comment is invited. Pleasesend Sponsored by: any comments by fax, e-mail or letter to: Sarah Lowe, lssG Co-ordinator (or Mick Clout, IssG Chair) School of Environmental and Marine Sciences University of Auckland (Tamaki Campus) Private Bag 92019, Auckland, New Zealand Manaaki Whenua. Tel: +64-9-3737-599 x 6814 Landcare Research Fax: +64-9-3737-042 [email protected] ISSN: 1173-59.88 c T E T s ~ --- ~.t? ~ ~ ~ tff;:!J~ Belarus Italy ~ " . \ ct:ida "" \r~ ~ ~ ~ ~~~\ ( ..Seychelles ~...~ ) r1 .Rodrigues Island .,0.1"'/ I\ U .Mauritius f " l Fynbos/~'c. ~ {\l ~tinaBuenosAires 1:7 .v~? ~,.~ v , ~ .-5-' > Guidelines..;BelarusSouth Americamammals.., -bivalves. .1 Mauritius eradications" ..,.8 .2 F~bos water project""" 9 .3 Solanum tampicense"""", ...10 Diary OECDworkshopGreyHawaiiDiary squirrel-HEAR in ItalyProject report... .4 Pistia stratiotes"""""""", ,..12 .5 Rodrigues Island plants ..13 .6 News and notes,."""""" ...15.16 .7 Subscriptions,:":""""",,,. ..15 From the 1930sto the1970s,thepolicies of some state sharethe fate of the European mink; vole populations departments of the former Soviet Union saw the ac- are threatened by American mink, which in turn climatization of species such as the American mink threaten the nesting places of water birds. Mustela vison {Schreb.) and raccoon dog Nyctereutes Raccoon dogs were brought to Belarus for the first procyonoides(Gray. ) in Belarus. The goal of thesepoli- time in 1936. The first animals were marked on the cies was to establish a thriving hunting stock from territory of the Berezinsky Reserve at the end of the which valuable fur could be harvested. 1950s.Today this speciesis one that is hunted in our republic..It isknowri to destroy the clutches and nest- American mink were introduced to Belarus in 1953 lings of landbirds. The raccoon dog is the cause of for the first time. More than on~ hundred animals the decrease in numbers of wood grouse, black were released by Lake Palic which is currently part grouse ~d hazel grouse in several regions of Belarus of the 78,000hectare Berezinsky Reserve.The reserVe and in specific parts of our reserve too. J would be includes boreal mixed, coniferous and spruce forests, interested to hear opinions on the management of as well ~s the bogs and bottomlands of the River such species for min;imisation of their influence on Berezina. The release of this species had negative our nahiral reserve ecosystems. Please contact me consequencesfor local fauna in the Berezinsky Re- for more detail. serve. American mink have almost forced from the territory of our reserve the less aggressive European Alexander P. Kashtalian mink, which are now seldom see,nin Belarus. And Berezinsky Biosphere Reserve recent evidence indicates that the water vole may leadkash@ber -bio.belpak. vitebsk;by 2 Three speciesof bivalves: Corbiculafluminea c. fluminea has an average density of 170 in- (Muller, 1774), C. largilliertie (Philippi, 1844) dividuals/m2 on the Rio de la Plata littoral. and Limnoperna furtunei (Dunker, 1857); L.fortunei was found for the first time in from the southeast of Asia, have reached the Bagliardi in September 1991, in isolated neotropical La Plata basin via the Rio de la groups of 5 or 6 individuals. By May 1992 its Plata river. average density was 31,222 individuals/m2. C. fluminea and L. fortunei are named as in- Then, a year later, it had increased to 82,151 vaders due to the fact that they are exotic, and individuals/m2, representing more than twice characterised by early sexual maturation, a the density of the previous year. high reproductive capacity and adaptability Along the Rio de la Plata littoral, L. fortunei to the different environments they colonize. presents an average density of 14,284 individulas/m2. These characteristics have permitted the rapid expansion of C. fluminea, not only into the Ituarte (1981) reported for the first time the Rio I;lela Plata zone, but also into the Parana presence of two bivalve species from the and Uruguay rivers. Darrigran and Pastorino southeast of Asia in the Rio de.la Plata river: (1995) ha'/e reported the presence of the ge- C. flumineaand C. largilliertie; The. link be- nus Corbicula in the central part of Argen- tween the countries is the shipping trade. tina. Ituarte also reported that Corbicula was in- Limnoperna fortunei is a freshwater species troduced to Argentina between 1965 and 1975, found in rivers and streams of China and the perhaps for consumption by crews since it is southeast of Asia. It was found for the first edible. time in America in 1991, in a locality known Continuous samplin~ in the above described as Bagliardio de la PI~ta river, Argentina. area showed that L. fortunei arrived at the Rio At the end of 1993, L. fortunei could only be de la Plata river in 1991. The Argentine im- found in the areafrom Punta Piedra:s(35" 26' S ports from places where this species is prima- -57" 08'W) up to Punta Lara (34" 48'S -57" rily found -Hong Kong, Vietnam, Thailand 59'W) on the Rio de la Plata river, but not in and Korea -have boosted the increase in num- any other country or river in America. But by bers, Since this is not a food species, it possi- the end of 1994 irnd beginning of 19~5, it had bly arrived in ~anks containing fresh water spreadfurther along the Rio de la Plata. It was with no biological treatment. Thus overseas even possible to find it at water inlets in Bemal ~ade should be subjected to a strict biologi- and Retiro; both part of Buenos Aires port. cal control. Likewise, this species was reported along the coastal area of Republica Oriental del Uru- Allover the world the control of plague mol- guay; all these localities line the Rio de la lusc~ is effected by means of electric dis- Plata. charge, chlorination, poisons (very toxic), During the last months of 1995, the first col- electromagnetism, high temperature, ultra- lections of L. fortunei were made from the sound, etc. There is often a high economic cost Parana river which is one of the four impor- and residual toxicity. tant sub-basins of La Plata. This illustrates Among all the problems caused by invading the bivalve's quick and continuous expansion, bivalve species in the northern hemisphere, as well as its adaptation to the different basin we may cite: environments. I) Blockage of important water pipes, either in houses and/or industry, which means: c. fluminea rather prefers sandy or muddy a) light reduction in the tubing; substrateswhere it can bury itself. p) decrease of flux velocity in the pipes due L. fortunei populations are found all over hard to friction (turbulent instead of laminar flux); substrates such as trunks, roots and stones, c) accumulation of empty shells in water including artificial coastal walls. tanks; 3 d) water contamination as a consequence of that affect the running water systems for ei- deficient control programs in relation to the ther human consumption or ind~strial use, invading species (mass mortality, treatments such as tho~e described by Morton (1973) in with poisons, etc.); Hong Kong; or the ones produced at the wa- e) blockage of water filters .during larval or ter-supply plant of La Plata city in 1994. juvenile stages of these molluscs. 2) Accelerated filling of irrigation canals: The mollusc fauna of the Rio de:la Plata river a) acceleration of sedimentation processes; has been threatened with extinction due toal- b) accumulation of empty shells, terations particularly in the water beds and, 3) Contamination of construction materials in general, in the natural habitats. This situa- (sand, gravel). tion has worsened due to the invasion of ex- 4) Changes in the composition of the native otic bivalve species: a shifting of and density mollusc fauna. decreasein the existing malacofauna are evi- dent. Corbiculafluminea has caused serious prob- lems in the United States since its arrival in For further information -concerning also the 1938. No damage has been detected in the molluscs: (Gastropoda: Prosobranchia) neotropical region, but it must be pointed out Heleobia piscium (d'Orbigny, 1835); that its ingression occurred 30 years after that (Pulmonata) Gundlachia concentrica in the northern region. (d'Orbigny, 1835) and Chilinafluminea Limnopema fortunei has become extremely (Maton, 1809) -please contact the author. dangerous due to the following factors: I. Its byssate epifaunal habit has no comReri; Gustavo Darrigran tive interaction with any other organ~smliv- Museo La Plata, Argentina ing in La Plata basin littoral. 2. This species evidences a high biotic poten- Fax: +54-21 :.257527 rial.