The annual, temporal and spatial pattern of Setaria tundra outbreaks in Finnish reindeer : a mechanistic transmission model approach
Abstract Background In northern Finland (Lapland), reindeer are reared as semi-domesticated animals. The region has a short summer season of 2–3 months, yet reindeer are infected with the mosquito-borne filarioid parasite Setaria tundra. The infection causes peritonitis and perihepatitis, which caus...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/263313 2023-08-20T04:08:44+02:00 The annual, temporal and spatial pattern of Setaria tundra outbreaks in Finnish reindeer : a mechanistic transmission model approach Haider, Najmul Laaksonen, Sauli Kjær, Lene J Oksanen, Antti Bødker, René 2018-11-18T04:28:26Z application/pdf http://hdl.handle.net/10138/263313 eng eng BioMed Central Parasites & Vectors. 2018 Nov 12;11(1):565 http://hdl.handle.net/10138/263313 The Author(s). Setaria tundra Spatio-temporal distribution Disease outbreak Reindeer Finland Microclimatic temperature Climate change http://purl.org/eprint/entityType/ScholarlyWork http://purl.org/eprint/entityType/Expression http://purl.org/eprint/type/JournalArticle 2018 ftunivhelsihelda 2023-07-28T06:12:36Z Abstract Background In northern Finland (Lapland), reindeer are reared as semi-domesticated animals. The region has a short summer season of 2–3 months, yet reindeer are infected with the mosquito-borne filarioid parasite Setaria tundra. The infection causes peritonitis and perihepatitis, which cause significant economic losses due to reduced body weight of infected animals. The objective of this study was to: (i) describe the spatial and temporal pattern of outbreaks in three different areas across Finnish Lapland; and (ii) construct a temperature-driven mechanistic transmission model to quantify the potential role of temperature on intensity of S. tundra transmission in reindeer. Methods We developed a temperature-driven transmission model able to predict the number of S. tundra potentially transmitted from an infectious reindeer. We applied the model to the years 2004–2015, and compared the predictions to the proportion of reindeer whose livers were condemned due to S. tundra infection at the time of slaughter. Results The mean proportion of liver condemnation increased in reindeer slaughtered in late autumn/winter compared to earlier dates. The outbreaks were geographically clustered each year but there were no fixed foci where outbreaks occurred. Larger outbreaks were recorded in the southern regions of reindeer-herding areas compared to the central or northern parts of Lapland. Our model showed that temperatures never allowed for transmission of more than a single generation of S. tundra each season. In southern (Kuusamo) and central (Sodankylä) Lapland, our model predicted an increasing trend from 1979 to 2015 for both the duration of the effective transmission period of S. tundra (P < 0.001) and for the potential number of L3 S. tundra larvae being transmitted from an infectious reindeer (P < 0.001). Conclusions The effective transmission period for S. tundra in reindeer is very short in Lapland, but it increased over the period studied. Only one generation of S. tundra can be transmitted in one ... Article in Journal/Newspaper Northern Finland Sodankylä Tundra Lapland Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Slaughter ENVELOPE(-85.633,-85.633,-78.617,-78.617) Kuusamo ENVELOPE(29.183,29.183,65.967,65.967) |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Setaria tundra Spatio-temporal distribution Disease outbreak Reindeer Finland Microclimatic temperature Climate change |
spellingShingle |
Setaria tundra Spatio-temporal distribution Disease outbreak Reindeer Finland Microclimatic temperature Climate change Haider, Najmul Laaksonen, Sauli Kjær, Lene J Oksanen, Antti Bødker, René The annual, temporal and spatial pattern of Setaria tundra outbreaks in Finnish reindeer : a mechanistic transmission model approach |
topic_facet |
Setaria tundra Spatio-temporal distribution Disease outbreak Reindeer Finland Microclimatic temperature Climate change |
description |
Abstract Background In northern Finland (Lapland), reindeer are reared as semi-domesticated animals. The region has a short summer season of 2–3 months, yet reindeer are infected with the mosquito-borne filarioid parasite Setaria tundra. The infection causes peritonitis and perihepatitis, which cause significant economic losses due to reduced body weight of infected animals. The objective of this study was to: (i) describe the spatial and temporal pattern of outbreaks in three different areas across Finnish Lapland; and (ii) construct a temperature-driven mechanistic transmission model to quantify the potential role of temperature on intensity of S. tundra transmission in reindeer. Methods We developed a temperature-driven transmission model able to predict the number of S. tundra potentially transmitted from an infectious reindeer. We applied the model to the years 2004–2015, and compared the predictions to the proportion of reindeer whose livers were condemned due to S. tundra infection at the time of slaughter. Results The mean proportion of liver condemnation increased in reindeer slaughtered in late autumn/winter compared to earlier dates. The outbreaks were geographically clustered each year but there were no fixed foci where outbreaks occurred. Larger outbreaks were recorded in the southern regions of reindeer-herding areas compared to the central or northern parts of Lapland. Our model showed that temperatures never allowed for transmission of more than a single generation of S. tundra each season. In southern (Kuusamo) and central (Sodankylä) Lapland, our model predicted an increasing trend from 1979 to 2015 for both the duration of the effective transmission period of S. tundra (P < 0.001) and for the potential number of L3 S. tundra larvae being transmitted from an infectious reindeer (P < 0.001). Conclusions The effective transmission period for S. tundra in reindeer is very short in Lapland, but it increased over the period studied. Only one generation of S. tundra can be transmitted in one ... |
format |
Article in Journal/Newspaper |
author |
Haider, Najmul Laaksonen, Sauli Kjær, Lene J Oksanen, Antti Bødker, René |
author_facet |
Haider, Najmul Laaksonen, Sauli Kjær, Lene J Oksanen, Antti Bødker, René |
author_sort |
Haider, Najmul |
title |
The annual, temporal and spatial pattern of Setaria tundra outbreaks in Finnish reindeer : a mechanistic transmission model approach |
title_short |
The annual, temporal and spatial pattern of Setaria tundra outbreaks in Finnish reindeer : a mechanistic transmission model approach |
title_full |
The annual, temporal and spatial pattern of Setaria tundra outbreaks in Finnish reindeer : a mechanistic transmission model approach |
title_fullStr |
The annual, temporal and spatial pattern of Setaria tundra outbreaks in Finnish reindeer : a mechanistic transmission model approach |
title_full_unstemmed |
The annual, temporal and spatial pattern of Setaria tundra outbreaks in Finnish reindeer : a mechanistic transmission model approach |
title_sort |
annual, temporal and spatial pattern of setaria tundra outbreaks in finnish reindeer : a mechanistic transmission model approach |
publisher |
BioMed Central |
publishDate |
2018 |
url |
http://hdl.handle.net/10138/263313 |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) ENVELOPE(-85.633,-85.633,-78.617,-78.617) ENVELOPE(29.183,29.183,65.967,65.967) |
geographic |
Sodankylä Slaughter Kuusamo |
geographic_facet |
Sodankylä Slaughter Kuusamo |
genre |
Northern Finland Sodankylä Tundra Lapland |
genre_facet |
Northern Finland Sodankylä Tundra Lapland |
op_relation |
Parasites & Vectors. 2018 Nov 12;11(1):565 http://hdl.handle.net/10138/263313 |
op_rights |
The Author(s). |
_version_ |
1774721187233923072 |