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Apeldoorn, Netherlands

Menno Soes D.,Bureau Waardenburg | Majoor G.D.,Jekerschans 12 | Keulen S.M.A.,Mesweg 10
Aquatic Invasions | Year: 2011

Bellamya chinensis, an Asian snail species, is reported for the first time from the Netherlands. These records are also the first reports from Europe. The species is commercially sold for garden ponds and aquaria, from which they may have escaped or been released. It is anticipated that this species will become invasive in the Netherlands and beyond. © 2011 The Author(s). Source

Filipova L.,Charles University | Filipova L.,University of Poitiers | Grandjean F.,University of Poitiers | Chucholl C.,University of Ulm | And 2 more authors.
Knowledge and Management of Aquatic Ecosystems | Year: 2011

Several alien crayfish of North American origin have become established in Europe in recent decades, but their identification is often confusing. Our aim was to verify the taxonomic status of their European populations by DNA barcoding. We sequenced the cytochrome c oxidase subunit I (COI) gene fragment of individuals representing all American crayfish known from European waters, and compared the results with reference sequences from North America. Our results confirm the morphological identification of Orconectes juvenilis from a population in eastern France, and of the marbled crayfish (Marmorkrebs), i.e., a parthenogenetic form of Procambarus fallax, from south-western Germany. Sequences of most individuals of presumed Procambarus acutus from the Netherlands were similar to American P. cf. acutus, but one was divergent, closer to a sequence of a reference individual of P. cf. zonangulus. However, divergences among three American P. cf. zonangulus samples were also high, comparable to interspecific variation within cambarid species complexes. The divergence between O. immunis from Europe and America also reached values corresponding to those observed among distinct Orconectes species. Genetic variation in the American range of these crayfish should therefore be further studied. Our study shows that DNA barcoding is useful for the rapid and accurate identification of exotic crayfish in Europe, and also provides insights into overall variation within these taxa. © ONEMA, 2011. Source

Nolet B.A.,Netherlands Institute of Ecology | Gyimesi A.,Bureau Waardenburg
Journal of Ornithology | Year: 2013

Many migratory birds use a chain of stopover sites to fuel their migration. Under time-minimizing migration, fuelling time and giving-up density at stopovers are predicted to depend on fuelling conditions. Fluctuations in food accessibility likely lead to changes in fuelling conditions, which should in turn be reflected in fuelling time and giving-up density. During their migration, Bewick's Swans Cygnus columbianus bewickii refuel on belowground tubers of Fennel Pondweed Potamogeton pectinatus in shallow lakes. We studied giving-up density and stop-over use (expressed in bird-days) of Bewick's Swans at an autumn stopover site (Lauwersmeer, The Netherlands) during 1995-2008, as dependent on local environmental conditions. High water levels were hypothesized to restrict access to tuber stocks. High water levels at the stopover site were predicted to lead to higher giving-up densities and less bird-days spent at the stopover. Annual variation in giving-up densities and number of bird-days was strongly associated with year-to-year differences in initial tuber biomass density and number of days with high water levels. As predicted, giving-up density increased and bird-days decreased with the number of days with high water level. We conclude that, in line with time-minimizing migration, changes in fuelling conditions may lead to underuse of a stopover site. Underuse of stopovers by migratory birds has been reported before but only in the sense that more food was left at stopover sites than at wintering sites. In contrast, in our case, dealing with a given stopover site, more food is left behind in some years than in other years. © 2013 The Author(s). Source

In this paper the population development of non-indigenous species in the breeding avifauna of The Netherlands is described. Four categories of non-indigenous species are distinguished: (1) invasive alien species, which successfully breed, increase in numbers and expand their range; (2) other (non-invasive) alien species, which have established (successful) breeding attempt(s), but do not increase nor spread; (3) introduced geese and ducks, that are native as migrant and wintering species, but whose establishment as breeding birds is not natural, and (4) feral species, domesticated forms now successfully breeding in the wild, of which some are increasing and spreading. Presently 19 invasive species are recognized, of which 17 breed annually in the Netherlands, and two species of flamingo breed just across the Dutch-German border (table 1). Since the first invasive species were noticed in thei96os, the number of species involved has risen (Fig. 2). All species involved are residents and censuses of breeding and non- breeding birds yield similar estimates of annual increase (Tables 1,2, Fig. 2). Most have increased with more than 10% per year over the past decades, but rates of increase have slowed down for most species in the last 10 years (Fig. 1). More than 20 other non-indigenous species have made at least one breeding attempt in recent years (Fig. 3). The number of species involved is increasing per decade. In de past 30 years several geese and ducks that were hitherto known only as native winter visitors started to breed in the Netherlands. The first was Barnacle Goose (considered to have escaped from waterfowl collections), followed by Greater White-fronted Goose (released birds formerly used as hunting decoys). In recent years a few more species have followed (Tab. 3, Fig. 1). Among domesticated forms, a few decades ago only three species had significant feral populations: feral pigeon, feral duck and Mute Swan. An increase was noticed mainly among domesticated waterfowl (Table 4, Fig. 1). The increasing and expanding species share certain features: they are originally residents, and mainly herbivorous (Fig. 4). Piscivore or granivore feeding habits are less common, but some species with these habits have been successful. Migratory species and insectivores are lacking among the successful non-indigenous birds. Many successful species are common in the bird trade and hence well-represented in collections from which they can escape. In the near future more species can be expected to become successfully established in the wild.The ongoing climate change (Fig. 5) may help invasive species with a (sub)tropical origin. More detailed information about exotic species in The Netherlands can be found in Lensink etal. (2013b), at www.buwa.nl. Source

Fijn R.C.,Bureau Waardenburg | Hiemstra D.,Koartwald 13 | Phillips R.A.,Natural Environment Research Council | Van Der Winden J.,Bureau Waardenburg
Ardea | Year: 2013

Arctic Terns Sterna paradisaea have an exceptionally long-distance migration, annually travelling back and forth between the Arctic and the Antarctic. Birds from Greenland, Iceland and the USA were recently found to spend most of the non-breeding period in the Weddell Sea, a small part of the large Antarctic range of Arctic Terns. Based on ring recoveries and sightings of West European Arctic Terns in the Indian Ocean and Australian waters, we expected that terns from The Netherlands (the southern limit of the breeding range) inhabit different Antarctic regions during the non-breeding season to their conspecifics from Greenland. To find out, geolocators were deployed on seven Arctic Terns captured on the nest in 2011 in The Netherlands. All birds were recaptured in 2012 and five devices yielded information on migration routes. The tracked terns spent on average 273 ± 7 days away from The Netherlands, and visited known staging areas in the North Atlantic and the Benguela Current, on both the outward and return journey. Similar tracks were observed in the terns from Greenland. However, hereafter the terns from The Netherlands moved to a previously unknown staging area in the central Indian Ocean, between 20-40°N and 65-100°E, and spent most of the non-breeding season in the Southern Ocean between 35-150°E. One bird migrated as far as New Zealand. Eventually, all five birds spent the austral summer in Wilkes Land, Antarctica, before flying back to the breeding colonies with a small detour to the same North Atlantic staging area they visited on their southward migration. The total travel distance in the course of the non-breeding period was ∼90,000 ± 2000 km, which substantially exceeds previous estimates for this species. Our study revealed new offshore staging areas and a yet unknown route through three different oceans, the longest bird migration described thus far. Source

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