Comparison of bird communities in stands of introduced lodgepole pine and native Scots pine in Sweden
The introduced lodgepole pine (Pinus contorta) occupies more than 650 000 hectares in Sweden. There are some differences between lodgepole pine and Scots pine (Pinus sylvestris) forests which could affect bird assemblages, for example differences in canopy density and ground vegetation. Birds were s...
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| Formato: | M2 |
| Lenguaje: | Inglés sueco |
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SLU/Dept. of Wildlife, Fish and Environmental Studies
2013
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| _version_ | 1855570798867120128 |
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| author | Alm, Arvid |
| author_browse | Alm, Arvid |
| author_facet | Alm, Arvid |
| author_sort | Alm, Arvid |
| collection | Epsilon Archive for Student Projects |
| description | The introduced lodgepole pine (Pinus contorta) occupies more than 650 000 hectares in Sweden. There are some differences between lodgepole pine and Scots pine (Pinus sylvestris) forests which could affect bird assemblages, for example differences in canopy density and ground vegetation. Birds were surveyed in 14 localities in northern Sweden, each characterized by one middle-aged stand of lodgepole pine next to a stand of Scots pine. The two paired stands in each locality were planted by the forestry company SCA at the same time and in similar environment to evaluate the potential of lodgepole pine in Sweden. In those 14 localities, one to three point count stations were established in both the lodgepole pine and the Scots pine stand, depending on the size of the area. The point count stations had a radius of 50 meters and all birds seen or heard inside that radius (overflying birds excluded) were counted on four visits in late May and June. There were no significant differences in total abundance and species richness between the lodgepole pine and Scots pine stands. A total number of 20 species were counted in Scots pine and 19 species in lodgepole pine. The spotted flycatcher (Muscicapa striata) had a significantly higher abundance in lodgepole pine stands and the chaffinch (Fringilla coelebs) had a nearly significantly higher abundance in the lodgepole pine stands. Two species had a tendency to be more common in the Scots pine forest: the goldcrest (Regulus regulus) and the willow warbler (Phylloscopus trochilus), but the differences were not statistically significant. I conclude that the common species which were recorded in large enough numbers for statistical analyses are probably not negatively affected by lodgepole pine at the stand scale, but further studies would be required to assess the breeding success of sensitive resident birds in lodgepole pine habitats before any definite conclusions can be drawn.
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| format | M2 |
| id | RepoSLU5167 |
| institution | Swedish University of Agricultural Sciences |
| language | Inglés swe |
| publishDate | 2013 |
| publishDateSort | 2013 |
| publisher | SLU/Dept. of Wildlife, Fish and Environmental Studies |
| publisherStr | SLU/Dept. of Wildlife, Fish and Environmental Studies |
| record_format | eprints |
| spelling | RepoSLU51672013-01-09T14:44:07Z Comparison of bird communities in stands of introduced lodgepole pine and native Scots pine in Sweden Jämförelse mellan fågelsamhällen i bestånd av introducerad contortatall och inhemsk tall i Sverige Alm, Arvid Boreal forest Pinus contorta Pinus sylvestris bird assemblage Muscicapa striata The introduced lodgepole pine (Pinus contorta) occupies more than 650 000 hectares in Sweden. There are some differences between lodgepole pine and Scots pine (Pinus sylvestris) forests which could affect bird assemblages, for example differences in canopy density and ground vegetation. Birds were surveyed in 14 localities in northern Sweden, each characterized by one middle-aged stand of lodgepole pine next to a stand of Scots pine. The two paired stands in each locality were planted by the forestry company SCA at the same time and in similar environment to evaluate the potential of lodgepole pine in Sweden. In those 14 localities, one to three point count stations were established in both the lodgepole pine and the Scots pine stand, depending on the size of the area. The point count stations had a radius of 50 meters and all birds seen or heard inside that radius (overflying birds excluded) were counted on four visits in late May and June. There were no significant differences in total abundance and species richness between the lodgepole pine and Scots pine stands. A total number of 20 species were counted in Scots pine and 19 species in lodgepole pine. The spotted flycatcher (Muscicapa striata) had a significantly higher abundance in lodgepole pine stands and the chaffinch (Fringilla coelebs) had a nearly significantly higher abundance in the lodgepole pine stands. Two species had a tendency to be more common in the Scots pine forest: the goldcrest (Regulus regulus) and the willow warbler (Phylloscopus trochilus), but the differences were not statistically significant. I conclude that the common species which were recorded in large enough numbers for statistical analyses are probably not negatively affected by lodgepole pine at the stand scale, but further studies would be required to assess the breeding success of sensitive resident birds in lodgepole pine habitats before any definite conclusions can be drawn. På 1920-talet införde man contortatallen (Pinus contorta) i Sverige och arealen med contorta har kraftigt ökat under 70- och 80-talet och uppgår nu till 650 000 hektar. Det finns vissa strukturella skillnader mellan en contortaplantering och en tallplantering (Pinus sylvestris). Bland annat är krontaket mycket tätare och sluter sig tidigare i en contortaplantering. Den skapar även en upp till tre gånger så hög mängd barr på marken vilket påverkar markvegetationen. Dessa egenskaper gör bland annat att andelen gran (Picea abies) och lövinslag i contortaplantagen är mycket lägre och även insektsfloran lär skilja något vilket gör att mängden föda för flera fågelarter kan påverkas. Fågelinventeringen gjordes i 14 odlingsförsök planterade av skogsbolaget SCA under åren 1969-70. Lokalerna var placerade i norra Sveriges inland och contorta- och tallbestånden planterades jämsides varandra och var mellan 10 till 45 hektar stora. Beroende på beståndets storlek lades en till tre fågeltaxeringsytor ut vilka hade en radie på 50 meter. Inom dessa ytor inventerades under 10 minuter per besök alla fåglar som sågs eller hördes (överflygande fåglar räknades ej). De 14 lokalerna besöktes 4 gånger. Resultaten visade inte på några stora skillnader i total abundans och inte heller i artrikedom mellan de båda beståndstyperna. I tallplanteringarna registrerades totalt 20 arter och 19 i contortaplanteringarna. Den enda fågelart som hade en signifikant högre abundans till contortabeståndens fördel var grå flugsnapparen (Muscicapa striata). Även bofinken (Fringilla coelebs) hade en nästan signifikant högre abundans i contortabestånden. Kungsfågeln (Regulus regulus) och lövsångaren (Phylloscopus trochilus) hade en tendens till att vara vanligare i tallbestånden. Sammanfattningsvis är de vanligt förekommande arterna som påträffades i tillräckligt stora antal i den här studien troligtvis inte negativt påverkade av contortatallen i Sverige. Däremot krävs vidare studier som fastställer häckningsframgång, för att utvärdera hur dessa påverkas när contortatallen planteras i stor omfattning, särskilt för de stannfåglar som kan vara känsligare för habitatförändringar än flyttfåglar. SLU/Dept. of Wildlife, Fish and Environmental Studies 2013 M2 eng swe https://stud.epsilon.slu.se/5167/ |
| spellingShingle | Boreal forest Pinus contorta Pinus sylvestris bird assemblage Muscicapa striata Alm, Arvid Comparison of bird communities in stands of introduced lodgepole pine and native Scots pine in Sweden |
| title | Comparison of bird communities in stands of introduced lodgepole pine and native Scots pine in Sweden |
| title_full | Comparison of bird communities in stands of introduced lodgepole pine and native Scots pine in Sweden |
| title_fullStr | Comparison of bird communities in stands of introduced lodgepole pine and native Scots pine in Sweden |
| title_full_unstemmed | Comparison of bird communities in stands of introduced lodgepole pine and native Scots pine in Sweden |
| title_short | Comparison of bird communities in stands of introduced lodgepole pine and native Scots pine in Sweden |
| title_sort | comparison of bird communities in stands of introduced lodgepole pine and native scots pine in sweden |
| topic | Boreal forest Pinus contorta Pinus sylvestris bird assemblage Muscicapa striata |