The response of subhumid mid-boreal graminoids to grazing by wood bison
A prediction from the herbivore optimization hypothesis is that for every combination of site/habitat type and plant community type there is a grazing intensity that causes a maximum increase in above-ground net primary productivity compared with the ungrazed control. NPP is defined as the rate of c...
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Akadémiai Kiadó
2005
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Online Access: | http://real.mtak.hu/67544/ http://real.mtak.hu/67544/1/comec.6.2005.1.5.pdf https://doi.org/10.1556/ComEc.6.2005.1.5 |
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ftmtak:oai:real.mtak.hu:67544 2023-05-15T15:44:48+02:00 The response of subhumid mid-boreal graminoids to grazing by wood bison Smith, D. L. La Roi, G. H. 2005 text http://real.mtak.hu/67544/ http://real.mtak.hu/67544/1/comec.6.2005.1.5.pdf https://doi.org/10.1556/ComEc.6.2005.1.5 hu hun Akadémiai Kiadó http://real.mtak.hu/67544/1/comec.6.2005.1.5.pdf Smith, D. L. and La Roi, G. H. (2005) The response of subhumid mid-boreal graminoids to grazing by wood bison. Community Ecology, 6 (1). pp. 39-47. ISSN 1585-8553 QH540 Ecology / ökológia Article PeerReviewed 2005 ftmtak https://doi.org/10.1556/ComEc.6.2005.1.5 2017-11-15T23:57:22Z A prediction from the herbivore optimization hypothesis is that for every combination of site/habitat type and plant community type there is a grazing intensity that causes a maximum increase in above-ground net primary productivity compared with the ungrazed control. NPP is defined as the rate of change in green, herbaceous biomass per unit time per unit area. We tested this hypothesis in the primary summer range of a growing population of wood bison (Bison bison athabascae) within the Mackenzie Bison Sanctuary, Northwest Territories, Canada. Plots (0.5 x 0.5 m) in graminoid meadows dominated by awned sedge (Carex atherodes) were either clipped at 3 cm, exposed to wood bison grazing, temporarily protected for 3 weeks, or permanently protected. This resulted in the removal of 100%, 0-79%, 0-79% or 0%, respectively, of shoot tissue available to wood bison. NPP of meadows clipped twice at 3 cm in 1986 was the same as control NPP at 5 study sites. In 1987, only the 2 most productive study sites of 1986 were intensively examined: plots clipped once in early summer increased in NPP by 120% and 133% compared to controls; NPP of meadows grazed by wood bison increased by 200% compared to controls at the most productive site, but remained the same as controls at the less productive site. Therefore, the herbivore optimization hypothesis was accepted at the 2 most productive sites in 1987, but rejected at all 5 study sites in 1986. In 1987, the standing crop of dead material was 258% and 142% higher in controls than in grazed plots at the 2 most productive sites. We think this dead material was responsible for the lower NPP observed in control plots. Article in Journal/Newspaper Bison bison athabascae Northwest Territories Wood Bison Bison bison bison MTAK: REAL (Library and Information Centre of the Hungarian Academy of Sciences Canada Northwest Territories Community Ecology 6 1 39 47 |
institution |
Open Polar |
collection |
MTAK: REAL (Library and Information Centre of the Hungarian Academy of Sciences |
op_collection_id |
ftmtak |
language |
Hungarian |
topic |
QH540 Ecology / ökológia |
spellingShingle |
QH540 Ecology / ökológia Smith, D. L. La Roi, G. H. The response of subhumid mid-boreal graminoids to grazing by wood bison |
topic_facet |
QH540 Ecology / ökológia |
description |
A prediction from the herbivore optimization hypothesis is that for every combination of site/habitat type and plant community type there is a grazing intensity that causes a maximum increase in above-ground net primary productivity compared with the ungrazed control. NPP is defined as the rate of change in green, herbaceous biomass per unit time per unit area. We tested this hypothesis in the primary summer range of a growing population of wood bison (Bison bison athabascae) within the Mackenzie Bison Sanctuary, Northwest Territories, Canada. Plots (0.5 x 0.5 m) in graminoid meadows dominated by awned sedge (Carex atherodes) were either clipped at 3 cm, exposed to wood bison grazing, temporarily protected for 3 weeks, or permanently protected. This resulted in the removal of 100%, 0-79%, 0-79% or 0%, respectively, of shoot tissue available to wood bison. NPP of meadows clipped twice at 3 cm in 1986 was the same as control NPP at 5 study sites. In 1987, only the 2 most productive study sites of 1986 were intensively examined: plots clipped once in early summer increased in NPP by 120% and 133% compared to controls; NPP of meadows grazed by wood bison increased by 200% compared to controls at the most productive site, but remained the same as controls at the less productive site. Therefore, the herbivore optimization hypothesis was accepted at the 2 most productive sites in 1987, but rejected at all 5 study sites in 1986. In 1987, the standing crop of dead material was 258% and 142% higher in controls than in grazed plots at the 2 most productive sites. We think this dead material was responsible for the lower NPP observed in control plots. |
format |
Article in Journal/Newspaper |
author |
Smith, D. L. La Roi, G. H. |
author_facet |
Smith, D. L. La Roi, G. H. |
author_sort |
Smith, D. L. |
title |
The response of subhumid mid-boreal graminoids to grazing by wood bison |
title_short |
The response of subhumid mid-boreal graminoids to grazing by wood bison |
title_full |
The response of subhumid mid-boreal graminoids to grazing by wood bison |
title_fullStr |
The response of subhumid mid-boreal graminoids to grazing by wood bison |
title_full_unstemmed |
The response of subhumid mid-boreal graminoids to grazing by wood bison |
title_sort |
response of subhumid mid-boreal graminoids to grazing by wood bison |
publisher |
Akadémiai Kiadó |
publishDate |
2005 |
url |
http://real.mtak.hu/67544/ http://real.mtak.hu/67544/1/comec.6.2005.1.5.pdf https://doi.org/10.1556/ComEc.6.2005.1.5 |
geographic |
Canada Northwest Territories |
geographic_facet |
Canada Northwest Territories |
genre |
Bison bison athabascae Northwest Territories Wood Bison Bison bison bison |
genre_facet |
Bison bison athabascae Northwest Territories Wood Bison Bison bison bison |
op_relation |
http://real.mtak.hu/67544/1/comec.6.2005.1.5.pdf Smith, D. L. and La Roi, G. H. (2005) The response of subhumid mid-boreal graminoids to grazing by wood bison. Community Ecology, 6 (1). pp. 39-47. ISSN 1585-8553 |
op_doi |
https://doi.org/10.1556/ComEc.6.2005.1.5 |
container_title |
Community Ecology |
container_volume |
6 |
container_issue |
1 |
container_start_page |
39 |
op_container_end_page |
47 |
_version_ |
1766379162669416448 |