Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway
In Norway, Sweden and Finland moose Alces alces hunting teams are often employed to survey occupied beaver (Castor fiber and C. canadensis) lodges while hunting. Results may be used to estimate population density or trend, or for issuing harvest permits. Despite the method's increasing populari...
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fthsbuskerudcom:oai:brage.bibsys.no:11250/2438060 2023-05-15T13:13:20+02:00 Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway Parker, Howard Rosell, Frank Gustavsen, Per Øyvind 2007-02-09T10:33:32Z 748099 bytes application/pdf http://hdl.handle.net/11250/2438060 eng eng Beavers Population survey 488 Journal article Peer reviewed 2007 fthsbuskerudcom 2017-05-21T08:14:07Z In Norway, Sweden and Finland moose Alces alces hunting teams are often employed to survey occupied beaver (Castor fiber and C. canadensis) lodges while hunting. Results may be used to estimate population density or trend, or for issuing harvest permits. Despite the method's increasing popularity, the errors involved have never been identified. In this study we 1) compare hunting-team counts of occupied lodges with total counts, 2) identify the sources of error between counts and 3) evaluate the method's management potential. The study was conducted in Bø Township (266 km2), Telemark County, Norway during 1995. Hunters reported the number of occupied lodges seen daily while hunting moose (25 September - 31 October). Teams (n = 12) undercounted occupied lodges in the township by 62% because 1) the probability of observing an occupied lodge within areas actually hunted on was 0.77,2) 37% of the moosehunting units were not hunted on and 3) 21% of the occupied lodges occurred in cultivated landscapes outside of moose-hunting units. Hunters had difficulty distinguishing between occupied and unoccupied lodges. Measures of precision and bias should be determined before using the method for practical management. Moose-hunting team surveys may be better suited for obtaining indexes of population change than estimates of occupied lodge number. Article in Journal/Newspaper Alces alces University of South-Eastern Norway: USN Open Archive (Brage) Bø ENVELOPE(12.567,12.567,66.167,66.167) Norway |
institution |
Open Polar |
collection |
University of South-Eastern Norway: USN Open Archive (Brage) |
op_collection_id |
fthsbuskerudcom |
language |
English |
topic |
Beavers Population survey 488 |
spellingShingle |
Beavers Population survey 488 Parker, Howard Rosell, Frank Gustavsen, Per Øyvind Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway |
topic_facet |
Beavers Population survey 488 |
description |
In Norway, Sweden and Finland moose Alces alces hunting teams are often employed to survey occupied beaver (Castor fiber and C. canadensis) lodges while hunting. Results may be used to estimate population density or trend, or for issuing harvest permits. Despite the method's increasing popularity, the errors involved have never been identified. In this study we 1) compare hunting-team counts of occupied lodges with total counts, 2) identify the sources of error between counts and 3) evaluate the method's management potential. The study was conducted in Bø Township (266 km2), Telemark County, Norway during 1995. Hunters reported the number of occupied lodges seen daily while hunting moose (25 September - 31 October). Teams (n = 12) undercounted occupied lodges in the township by 62% because 1) the probability of observing an occupied lodge within areas actually hunted on was 0.77,2) 37% of the moosehunting units were not hunted on and 3) 21% of the occupied lodges occurred in cultivated landscapes outside of moose-hunting units. Hunters had difficulty distinguishing between occupied and unoccupied lodges. Measures of precision and bias should be determined before using the method for practical management. Moose-hunting team surveys may be better suited for obtaining indexes of population change than estimates of occupied lodge number. |
format |
Article in Journal/Newspaper |
author |
Parker, Howard Rosell, Frank Gustavsen, Per Øyvind |
author_facet |
Parker, Howard Rosell, Frank Gustavsen, Per Øyvind |
author_sort |
Parker, Howard |
title |
Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway |
title_short |
Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway |
title_full |
Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway |
title_fullStr |
Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway |
title_full_unstemmed |
Errors associated with moose-hunter counts of occupied beaver Castor fiber lodges in Norway |
title_sort |
errors associated with moose-hunter counts of occupied beaver castor fiber lodges in norway |
publishDate |
2007 |
url |
http://hdl.handle.net/11250/2438060 |
long_lat |
ENVELOPE(12.567,12.567,66.167,66.167) |
geographic |
Bø Norway |
geographic_facet |
Bø Norway |
genre |
Alces alces |
genre_facet |
Alces alces |
_version_ |
1766257740065275904 |