Inveterarens underbara resa genom Jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (Calypso bulbosa) med fokus på Jämtlands län
As a member state of the European union, Sweden is obligated to report the status of the species and habitats protected under the Habitats Directive every sixth year. Calypso bulbosa is one such species. Currently, there is suspicion that the true Swedish population size might have been heavily unde...
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Uppsala universitet, Institutionen för biologisk grundutbildning
2023
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ftuppsalauniv:oai:DiVA.org:uu-513731 2023-11-12T04:23:26+01:00 Inveterarens underbara resa genom Jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (Calypso bulbosa) med fokus på Jämtlands län Larsson, Elina 2023 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-513731 swe swe Uppsala universitet, Institutionen för biologisk grundutbildning http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-513731 info:eu-repo/semantics/openAccess artutbredningsmodell SDM norna Calypso bulbosa habitatdirektivet Ecology Ekologi Student thesis info:eu-repo/semantics/bachelorThesis text 2023 ftuppsalauniv 2023-10-18T22:31:53Z As a member state of the European union, Sweden is obligated to report the status of the species and habitats protected under the Habitats Directive every sixth year. Calypso bulbosa is one such species. Currently, there is suspicion that the true Swedish population size might have been heavily underestimated, as the habitat the species inhabits is relatively common. To address this uncertainty, Stephan et al. (2022) from SLU Artdatabanken produced a species distribution model (SDM) relating the presence/pseudo absence of C. bulbosa to a series of selected environmental factors. The model was then used to map potential growth sites as continuous probabilities across northern Sweden on a hectare level. In this report I test the accuracy of the above-mentioned model and provide data to be used in future improvements of this model. I visited 13 areas across Jämtland county, collecting presence/absence data from hectare squares with varying probabilities of presence according to the species distribution model. Logistic regression was then used on four data sets to determine if the probabilities of the model could explain the presence/absence observed in the field. I also recorded presence/absence of eight other plant species to determine if their presence/absence were associated with the presence/absence of C. bulbosa. The results showed a significant positive relationship (p = 0,0167) between the probabilities of the SDM and the presence of C. bulbosa recorded in the field for one of the data sets. This data set included data from a simultaneous study in the Lapland part of Norrbotten county but excluded locations with previous recordings of the species. However, the probabilities only explained 1% of the variation in the field data. There were indeed also significant associations between the presence of four out of eight suggested associated species and that of C. bulbosa. These species were, in order of declining association: Goodyera repens, Maianthemum bifolium, Daphne mezereum and Gymnocarpium dryopteris. ... Bachelor Thesis Northern Sweden Lapland Norrbotten Uppsala University: Publications (DiVA) |
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Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
Swedish |
topic |
artutbredningsmodell SDM norna Calypso bulbosa habitatdirektivet Ecology Ekologi |
spellingShingle |
artutbredningsmodell SDM norna Calypso bulbosa habitatdirektivet Ecology Ekologi Larsson, Elina Inveterarens underbara resa genom Jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (Calypso bulbosa) med fokus på Jämtlands län |
topic_facet |
artutbredningsmodell SDM norna Calypso bulbosa habitatdirektivet Ecology Ekologi |
description |
As a member state of the European union, Sweden is obligated to report the status of the species and habitats protected under the Habitats Directive every sixth year. Calypso bulbosa is one such species. Currently, there is suspicion that the true Swedish population size might have been heavily underestimated, as the habitat the species inhabits is relatively common. To address this uncertainty, Stephan et al. (2022) from SLU Artdatabanken produced a species distribution model (SDM) relating the presence/pseudo absence of C. bulbosa to a series of selected environmental factors. The model was then used to map potential growth sites as continuous probabilities across northern Sweden on a hectare level. In this report I test the accuracy of the above-mentioned model and provide data to be used in future improvements of this model. I visited 13 areas across Jämtland county, collecting presence/absence data from hectare squares with varying probabilities of presence according to the species distribution model. Logistic regression was then used on four data sets to determine if the probabilities of the model could explain the presence/absence observed in the field. I also recorded presence/absence of eight other plant species to determine if their presence/absence were associated with the presence/absence of C. bulbosa. The results showed a significant positive relationship (p = 0,0167) between the probabilities of the SDM and the presence of C. bulbosa recorded in the field for one of the data sets. This data set included data from a simultaneous study in the Lapland part of Norrbotten county but excluded locations with previous recordings of the species. However, the probabilities only explained 1% of the variation in the field data. There were indeed also significant associations between the presence of four out of eight suggested associated species and that of C. bulbosa. These species were, in order of declining association: Goodyera repens, Maianthemum bifolium, Daphne mezereum and Gymnocarpium dryopteris. ... |
format |
Bachelor Thesis |
author |
Larsson, Elina |
author_facet |
Larsson, Elina |
author_sort |
Larsson, Elina |
title |
Inveterarens underbara resa genom Jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (Calypso bulbosa) med fokus på Jämtlands län |
title_short |
Inveterarens underbara resa genom Jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (Calypso bulbosa) med fokus på Jämtlands län |
title_full |
Inveterarens underbara resa genom Jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (Calypso bulbosa) med fokus på Jämtlands län |
title_fullStr |
Inveterarens underbara resa genom Jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (Calypso bulbosa) med fokus på Jämtlands län |
title_full_unstemmed |
Inveterarens underbara resa genom Jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (Calypso bulbosa) med fokus på Jämtlands län |
title_sort |
inveterarens underbara resa genom jämtland - ett test av träffsäkerheten i artutbredningsmodell för norna (calypso bulbosa) med fokus på jämtlands län |
publisher |
Uppsala universitet, Institutionen för biologisk grundutbildning |
publishDate |
2023 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-513731 |
genre |
Northern Sweden Lapland Norrbotten |
genre_facet |
Northern Sweden Lapland Norrbotten |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-513731 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1782338199764336640 |