Erling Meisingset
Forsker
(+47) 918 08 860
erling.meisingset@nibio.no
Sted
Tingvoll
Besøksadresse
Gunnars veg 6, 6630 Tingvoll
Forfattere
Atle Mysterud William Ryan Easterday Vetle Malmer Stigum Anders Aas Erling Meisingset Hildegunn ViljugreinSammendrag
Global environmental changes are causing Lyme disease to emerge in Europe. The life cycle of Ixodes ricinus, the tick vector of Lyme disease, involves an ontogenetic niche shift, from the larval and nymphal stages utilizing a wide range of hosts, picking up the pathogens causing Lyme disease from small vertebrates, to the adult stage depending on larger (non-transmission) hosts, typically deer. Because of this complexity the role of different host species for emergence of Lyme disease remains controversial. Here, by analysing long-term data on incidence in humans over a broad geographical scale in Norway, we show that both high spatial and temporal deer population density increase Lyme disease incidence. However, the trajectories of deer population sizes play an overall limited role for the recent emergence of the disease. Our study suggests that managing deer populations will have some effect on disease incidence, but that Lyme disease may nevertheless increase as multiple drivers are involved.
Forfattere
Even Unsgård Erling Meisingset Inger Maren Rivrud Gunn Randi Fossland Pål Thorvaldsen Vebjørn Veiberg Atle MysterudSammendrag
In Europe, over a third of the agricultural area is grass meadows used for livestock grazing and fodder production. Grass meadows provide a food source for wild ungulates causing human-wildlife conflicts due to forage removal. Few experimental studies have quantified biomass loss with enough replicates to determine how surrounding environments influences level of biomass removal. Using an exclosure experiment on 57 grassland meadows over five years at the northwest coast of Norway covering 10 650 km2, we quantified biomass removal by red deer (Cervus elaphus L.) and how environmental factors impacted biomass loss (Study 1). Furthermore, we examined development of biomass loss and crude protein concentration in five fields throughout the growing season (Study 2). The average predicted biomass loss to red deer grazing was 16% for the first harvest, and 7.3% for the second harvest (Study 1). Biomass loss increased with red deer density from 0% at the lowest density (0.6 red deer harvested/km2) to 31% at the highest density (4 red deer harvested/km2). Biomass loss increased from 12% to 32.8% as terrain ruggedness index (TRI) rose from 2.1 to 7.1. Absolute biomass loss increased towards time of grass harvest (Study 2). Crude protein concentration was higher in unfenced plots during the period before first harvest, but not between first and second harvest (Study 2). The quantification of biomass removal at a large spatial scale over several years in this study provides a better understanding of factors causing variation in losses.
Sammendrag
Denne rapporten oppsummerer resultatene fra analyser av elgens forflytnings- og trekkmønster og leveområder for 12 GPS merka elger i Stabbursdalen nasjonalpark i Porsanger kommune i 2018. Ut fra GPS-elgenes posisjoner ble det analysert forflytningsmønster, trekkdistanser, trekkruter og tidspunkt for vår- og høsttrekket, leveområdestørrelse i løpet av året og i jakttida og bruken av ulike habitatkategorier i løpet av året. I tillegg ble elgens forflytningsmønstre i forhold til inndelingen i bestandsplanområder og jaktfelt i regionen analysert. Totalt sett gir studien viktig innsikt i elgens arealbruk og kan bidra til bedre forvaltning og bevaring av elgbestanden og å sikre furuskogen i Stabbursdalen.
Forfattere
Jason Lee Anders Marie Louise Davey Bram Van Moorter Frode Fossøy Sanne Boessenkool Erling Johan Solberg Erling Meisingset Atle Mysterud Christer Moe RolandsenSammendrag
Det er ikke registrert sammendrag
