Bias in density estimations using strip transects in dry open-country environments in the Canary Islands
We studied bias in density estimations derived from strip transects in dry open-country in the Canary Islands. We also present some critical remarks on García-del-Rey’s (2005) paper regarding strip transects and the validity of comparisons based on population densities of birds in scrublands on Tene...
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| Format: | Article |
| Language: | English |
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Museu de Ciències Naturals de Barcelona
2008-12-01
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| Series: | Animal Biodiversity and Conservation |
| Subjects: | |
| Online Access: | http://abc.museucienciesjournals.cat/files/ABC-31-2-pp-45-50.pdf |
| _version_ | 1818369910913368064 |
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| author | Carrascal, L. M. Palomino, D. Seoane, J. |
| author_facet | Carrascal, L. M. Palomino, D. Seoane, J. |
| author_sort | Carrascal, L. M. |
| collection | DOAJ |
| description | We studied bias in density estimations derived from strip transects in dry open-country in the Canary Islands. We also present some critical remarks on García-del-Rey’s (2005) paper regarding strip transects and the validity of comparisons based on population densities of birds in scrublands on Tenerife island using two different methods: territory mapping and strip transect sampling. Although strip transects with census belts of 25 m do not account for detectability, this method only slightly undervalues true density estimates, and allowed to detect more than 85% of birds present in poorly vegetated environments in the Canary Islands. Previously published works on distribution and abundance of terrestrial birds in the Canary Islands using the strip transect sampling with belts of 25 m on both sides of the observer, thus provide reliable information that only slightly underestimates true densities. |
| first_indexed | 2024-12-13T23:31:21Z |
| format | Article |
| id | doaj.art-dd026f66f3b04fde95a3f9bd416a4f70 |
| institution | Directory Open Access Journal |
| issn | 1578-665X |
| language | English |
| last_indexed | 2024-12-13T23:31:21Z |
| publishDate | 2008-12-01 |
| publisher | Museu de Ciències Naturals de Barcelona |
| record_format | Article |
| series | Animal Biodiversity and Conservation |
| spelling | doaj.art-dd026f66f3b04fde95a3f9bd416a4f702022-12-21T23:27:25ZengMuseu de Ciències Naturals de BarcelonaAnimal Biodiversity and Conservation1578-665X2008-12-013124550Bias in density estimations using strip transects in dry open-country environments in the Canary IslandsCarrascal, L. M.Palomino, D.Seoane, J. We studied bias in density estimations derived from strip transects in dry open-country in the Canary Islands. We also present some critical remarks on García-del-Rey’s (2005) paper regarding strip transects and the validity of comparisons based on population densities of birds in scrublands on Tenerife island using two different methods: territory mapping and strip transect sampling. Although strip transects with census belts of 25 m do not account for detectability, this method only slightly undervalues true density estimates, and allowed to detect more than 85% of birds present in poorly vegetated environments in the Canary Islands. Previously published works on distribution and abundance of terrestrial birds in the Canary Islands using the strip transect sampling with belts of 25 m on both sides of the observer, thus provide reliable information that only slightly underestimates true densities.http://abc.museucienciesjournals.cat/files/ABC-31-2-pp-45-50.pdfBirdsCanary IslandsCensus methodsStrip transectsOpen-country environmentsPopulation densityTerritory mapping |
| spellingShingle | Carrascal, L. M. Palomino, D. Seoane, J. Bias in density estimations using strip transects in dry open-country environments in the Canary Islands Animal Biodiversity and Conservation Birds Canary Islands Census methods Strip transects Open-country environments Population density Territory mapping |
| title | Bias in density estimations using strip transects in dry open-country environments in the Canary Islands |
| title_full | Bias in density estimations using strip transects in dry open-country environments in the Canary Islands |
| title_fullStr | Bias in density estimations using strip transects in dry open-country environments in the Canary Islands |
| title_full_unstemmed | Bias in density estimations using strip transects in dry open-country environments in the Canary Islands |
| title_short | Bias in density estimations using strip transects in dry open-country environments in the Canary Islands |
| title_sort | bias in density estimations using strip transects in dry open country environments in the canary islands |
| topic | Birds Canary Islands Census methods Strip transects Open-country environments Population density Territory mapping |
| url | http://abc.museucienciesjournals.cat/files/ABC-31-2-pp-45-50.pdf |
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