TICKLESS - Reduced ticks and tick-borne diseases in sheep by integrated management
End: mar 2015
Start: jan 2011
Project participants
Ingrid Olesen Atle Mysterud Snorre Stuen Ingeborg Klingen Lucy Gilbert Nicolai Vitt Meyling Hermann Strasser| Status | Concluded |
| External project link | http://www.bioforsk.no |
| Start - end date | 01.01.2011 - 31.03.2015 |
| Project manager | Lise Grøva |
Publications in the project
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Lise Grøva Panya Sae-Lim Ingrid Olesen Thor Blichfeldt Lars Qviller Ann-Kristin Tveten Ingeborg Klingen Hermann Strasser Lucy GilbertAbstract
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Background: Climate change can affect the activity and distribution of species, including pathogens and parasites. The densities and distribution range of the sheep tick (Ixodes ricinus) and it’s transmitted pathogens appears to be increasing. Thus, a better understanding of questing tick densities in relation to climate and weather conditions is urgently needed. The aim of this study was to test predictions regarding the temporal pattern of questing tick densities at two different elevations in Norway. We predict that questing tick densities will decrease with increasing elevations and increase with increasing temperatures, but predict that humidity levels will rarely affect ticks in this northern, coastal climate with high humidity. Methods: We described the temporal pattern of questing tick densities at ~100 and ~400 m a.s.l. along twelve transects in the coastal region of Norway. We used the cloth lure method at 14-day intervals during the snow-free season to count ticks in two consecutive years in 20 m2 plots. We linked the temporal pattern of questing tick densities to local measurements of the prevailing weather. Results: The questing tick densities were much higher and the season was longer at ~100 compared to at ~400 m a.s.l. There was a prominent spring peak in both years and a smaller autumn peak in one year at ~100 m a.s.l.; but no marked peak at ~400 m a.s.l. Tick densities correlated positively with temperature, from low densities <5°C, then increasing and levelling off >15-17°C. We found no evidence for reduced questing densities during the driest conditions measured. Conclusions: Tick questing densities differed even locally linked to elevation (on the same hillside, a few kilometers apart). The tick densities were strongly hampered by low temperatures that limited the duration of the questing seasons, whereas the humidity appeared not to be a limiting factor under the humid conditions at our study site. We expect rising global temperatures to increase tick densities and lead to a transition from a short questing season with low densities in the current cold and sub-optimal tick habitats, to longer questing seasons with overall higher densities and a marked spring peak.
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Forskere kan ha funnet en metode som tar knekken på flåtten. snyltedyret kan bli knekt av sin egen snylter, en sopp som til slutt tar livet av flåtten.
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Ingeborg KlingenAbstract
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Ingeborg KlingenAbstract
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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Lise GrøvaAbstract
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