Snorre Hagen
Head of Department/Head of Research
Authors
Nina Johansen Hans Geir Eiken Simeon Rossmann May Bente Brurberg Monica Skogen Marta Bosque Fajardo Borghild Glorvigen Toril Sagen Eklo Finn-Arne Haugen Snorre Hagen Erik LysøeAbstract
Abstract Several aphid species pose serious treats to potato crops by causing direct damage to the plants and/or indirectly by transmitting viruses. Different morphological forms and phenotypic plasticity among aphids complicates taxonomy and identification and thus makes targeted pest management in potatoes challenging. To obtain an overview of aphids frequenting potato fields in Norway, we investigated seasonal and annual changes in aphid populations in five potato fields (58–64 °N) over a three-year period (2016–2018), using yellow pan traps. In total 2218 of the 6136 collected aphids were identified by traditional barcoding, meaning sequencing a ~ 650 fragment of the mitochondrial COI gene. This revealed 137 different species, of which 111 were identified at the species level. The remaining were identified only to the genus level, indicating potential novel species. The southernmost sampling location yielded the highest number of species and individual counts, although no clear correlations to climate factors (temperature/precipitation) was observed. Of the 111 species identified, at least 39 are potential vectors of potato virus Y (PVY) and nine species may also transmit potato virus A (PVA). Knowledge on virus vector and non-vector aphid abundance and phenology have the potential to improve pest management of potato cultivation.
Authors
Sławomir Kaczmarek Tomasz Marquardt Snorre Hagen Cornelya Klutsch Steffen Roth Anna SeniczakAbstract
Abstract To date, only adults of Zercon forsslundi have been known. According to the description of this species, it has been the first report of Zercon with clear differences in opisthonotal chaetotaxy between females and males, a unique character in the genus. At the same time, Z. forsslundi belongs to a unique group of Zercon species with dorsal setae J5 in females clearly longer than setae J1 – J4 , the latter ones being short and of similar length. Our description is the first-ever report on the full morphological ontogeny of Z. forsslundi , the mite species, the adult which is the most similar to the recently described Zercon hamaricus and to a lesser extent to Zercon polonicus . The morphological closeness of the above-mentioned species has been confirmed in immature stages. We also studied the geographic distribution of Z. forsslundi and its above-mentioned congeners with remarks on their evolutionary affinity on the background of dispersal abilities and faunal dispersal after the Last Glacial Maximum. We also report the occurrence of Z. forsslundi and Z. hamaricus in the Northern Norway for the first time. Ranges of Z. forsslundi and Z. hamaricus overlap in the area of N Norway. Also, the microenvironmental sympatry was confirmed for these taxa. We also proved the niche overlap of these two species, which is probably limited to the northern verge of Eurasia. Zercon polonicus , not present in the current Arctic fauna, probably is a post-glacial relict, inhabiting more southern mountainous areas of Europe (Carpathians and Alps).
Authors
Merijn van den Bosch Marta De Barba Andreas Zedrosser Nuria Selva Niko Balkenhol Luigi Maiorano Julien Renaud Gregor Simcic Ainhoa Graciarena Shane C. Frank Anne G. Hertel Aida Parres Hüseyin Ambarlı Andriy‐Taras Bashta Natalia Bragalanti Henrik Brøseth Mark Chynoweth Duško Ćirović Paolo Ciucci Csaba Domokos Aleksandar Dutsov Alper Ertürk Ancuta Fedorca Mihai Fedorca Stefano Filacorda Slavomir Finďo Luca Fumagalli Miguel de Gabriel Hernando Claudio Groff Snorre Hagen Bledi Hoxha Djuro Huber Otso Huitu Georgeta Ionescu Ovidiu Ionescu Klemen Jerina Alexandros Karamanlidis Jonas Kindberg Ilpo Kojola Alexander Kopatz Diana Krajmerová José Vicente López‐Bao Peep Männil Yorgos Mertzanis Anja Molinari‐Jobin Paolo Molinari Andrea Mustoni Javier Naves Sergey Ogurtsov Deniz Özüt Santiago Palazon Jasmin Pasic Ladislav Paule Milan Paunović Aleksandar Perovic Stefano Pesaro Vladimir Piminov Mihai I. Pop Maria Psaralexi Pierre Yves Quenette Georg Rauer Slaven Reljic Eloy Revilla Urmas Saarma Alexander Saveljev Ali Onur Sayar Cagan Sekercioglu Agnieszka Sergiel Tomaz Skrbinsek Michaela Skuban Anil Soyumert Aleksandar Stojanov Konstantin Tirronen Aleksandër Trajçe Igor Trbojević Tijana Trbojević Filip Zięba Diana Zlatanova Tomasz Zwijacz‐Kozica Jerrold L. BelantAbstract
Aim Large carnivores worldwide have experienced substantial range contractions due to human activities, though several species are recolonising parts of their historical range. We aimed to assess current and potential European brown bear ( Ursus arctos arctos ) habitat as well as habitat connectivity on a continental scale. Location The extended biogeographical regions of Europe, spanning from Portugal to central Russia, longitudinally, and from Norway to Türkiye, latitudinally. Excluding inland seas; this area covers 11,151,636 km 2 . Methods We assessed habitat suitability throughout the study area using an ensemble species distribution model with nine submodels, using data from 10 European bear populations and Türkiye. We used the resulting habitat suitability maps to conduct a least‐cost path connectivity analysis and an omnidirectional circuit connectivity analysis. Main Conclusions Habitat suitability was strongly associated with low percentages of agricultural cover, low percentages of human development, and proximity to forest. Of our entire study area, 37% (4.09 million km 2 ) is occupied or potentially suitable for bears. Connectivity analyses identified corridors that could facilitate movement among southern European bear populations, though agricultural land and human development limit connectivity between northern and southern European bear populations. Previous research estimated bears occupied 0.5 million km 2 across the European Union, while our results estimate 1.82 million km 2 of this part of our study area is potentially suitable for bears, though connectivity is limited. Our results inform conservation strategies and policy development for the future of brown bears in Europe, emphasising the need for transboundary conservation efforts.
