Time filter

Source Type

Hatteland B.A.,University of Bergen | Hatteland B.A.,Norwegian Institute for Agricultural And Environmental Research Bioforsk | Solhoy T.,University of Bergen | Schander C.,University of Bergen | And 4 more authors.
Malacologia | Year: 2015

The large arionid slug Arion vulgaris is an invasive pest dispersing through large parts of Europe and causing considerable damage in gardens, horticulture and agriculture. It is also possible that this so-called "Iberian slug" has an impact on Norwegian ecosystems, displacing or hybridizing with the native black slug Arion ater. The taxonomy of the large arionids is complex and confusing, encompassing different anatomical forms and colour varieties. The present study integrates, for the first time, coloration, ligula morphology, genital morphometry, nuclear and mitochondrial DNA in order to differentiate the large arionids found in Norway, A. vulgaris, A. ater and A. rufus. These data revealed a clear separation between A. vulgaris and A. ater based on the morphology of the genitalia and mtDNA. However, introgression with the red slug A. rufus was apparent in approximately half of the A. ater specimens analysed, evidenced by ligula morphology, mitochondrial and nuclear DNA. In addition, the mitochondrial COI gene and the nuclear ITS1 gene suggested introgression between A. ater and A. vulgaris. Phylogenetic analyses that included A. vulgaris, A. ater and A. rufus from other parts of Europe, together with A. flagellus, A. fuscus, A. Lusitanicus and A. nobrei suggest that A. vulgaris is more closely related to A. ater and A. rufus than to A. Lusitanicus. This study confirms the uncertainty of identification based solely on coloration and stresses the importance of integrating several approaches to differentiate these large arionids, allowing a better appreciation of their invasive potential, ecological impact and current distribution.

Nilson G.,Gothenburg Natural History Museum | Rastegar-Pouyani N.,Razi University
Zoology in the Middle East | Year: 2013

Telescopus nigriceps, was discovered in the Kermanshah region in Iran, which is the first record of this species in Iran. A comparison is made with the sympatric and parapatric Telescopus tessellatus and T. fallax iberus. © Zoology in the Middle East, 2013.

Abtin E.,Sistan and Baluchistan province | Nilson G.,Gothenburg Natural History Museum | Mobaraki A.,Biodiversity and Wildlife Bureau | Hosseini A.A.,Sistan and Baluchestan province | Dehgannejhad M.,Sistan and Baluchestan province
Russian Journal of Herpetology | Year: 2014

We describe a new species of krait (Elapidae, Bungarus) from Baluchistan, Iran and that differs from all species of Bungarus except its closest relative Bungarus sindanus by having 17 dorsal midbody scale rows. The new species differs from the related allopatric Bungarus sindanus and B. caeruleus by a higher number of ventral plates and a different pattern and by an isolated occurrence in Baluchistan (Iran and Pakistan border region). The new species is especial by having a clear black spot in the loreal region and with an occasionally developed loreal plate (on both sides of head in the holotype). © 2014 Folium Publishing Company.

Nakano H.,Gothenburg University | Nakano H.,University of Tsukuba | Lundin K.,Gothenburg Natural History Museum | Bourlat S.J.,Gothenburg University | And 7 more authors.
Nature Communications | Year: 2013

Xenoturbella bocki, a marine animal with a simple body plan, has recently been suggested to be sister group to the Acoelomorpha, together forming the new phylum Xenacoelomorpha. The phylogenetic position of the phylum is still under debate, either as an early branching bilaterian or as a sister group to the Ambulacraria (hemichordates and echinoderms) within the deuterostomes. Although development has been described for several species of Acoelomorpha, little is known about the life cycle of Xenoturbella. Here we report the embryonic stages of Xenoturbella, and show that it is a direct developer without a feeding larval stage. This mode of development is similar to that of the acoelomorphs, supporting the newly proposed phylum Xenacoelomorpha and suggesting that the last common ancestor of the phylum might have been a direct developer. © 2013 Macmillan Publishers Limited.

Drotz M.K.,Lake Vanern Museum of Natural and Cultural History | Berggren M.,Gothenburg University | Lundberg S.,Swedish Museum of Natural History | Lundin K.,Gothenburg Natural History Museum | von Proschwitz T.,Gothenburg Natural History Museum
Aquatic Invasions | Year: 2010

Single specimens of the Chinese mitten crab, Eriocheir sinensis H. Milne Edwards, 1853, have been regularly reported along the western and eastern coasts of Sweden since the 1930's. The crab has most likely been brought from overseas via the transfer of ship's ballast water or secondarily introduced from its key European distribution areas. Since 2001 a sharp increase in the occurrence of the mitten crab has been noticed in Swedish inland waters, but the dispersal routes and distribution of the species into Sweden remain poorly known. Here we document the current and historical distribution of the Chinese mitten crab in Sweden and assess possible invasion routes. A special focus is put on the historical occurrence of crabs in Lake Vänern, which empties into the Skagerrak/North Sea and Lake Mälaren, which connects to the Baltic Sea. The existing time series available for the mitten crab from the two lakes shows a large variation in dispersal pattern between different areas within each lake. In order to detect and monitor outbreaks of the mitten crab in Sweden, an internet based reporting system was created in 2007. Museum collections and reports from the general public throughout Sweden were compared with the known occurrence of mitten crabs in Lake Vänern and Lake Mälaren. During the study, the web-based reporting system was not advertised and the general public did not get paid for reporting the information. Population densities of the crab occurred "in peaks" and unevenly over the last decade in both lakes, suggesting a pulse invasion instead of a constant supply by migration. Significant difference in male and female occurrence together with few transport possibilities between lakes suggests different invasion routes for the crabs. Reports from the general public throughout Sweden coincide with the observations from local fishermen in Lake Mälaren and Lake Vänern. Data on occurrence and abundance are discussed in relation to a potential reproduction area on the western coast of Sweden. © 2010 The Author(s).

Discover hidden collaborations