Timber Damage by Black Bears

Timber Damage by Black Bears PDF Author: Dale L. Nolte
Publisher:
ISBN:
Category : Black bear
Languages : en
Pages : 14

Get Book Here

Book Description
Describes alternative approaches to controlling the damage black bears cause during the spring when they strip bark to eat the newly formed wood underneath. One bear might strip as many as 70 trees in a day. The trees will be damaged and may be killed if the bark is stripped all the way around the tree, girdling it. Bears appear to strip the most vigorous trees, preferring stands that have been thinned, or those where urea fertilizer has been applied. Bears also appear to prefer trees with a high concentration of sugars relative to the concentration of terpenes. Pruning decreases the sugar-to-terpene ratio, reducing the likelihood that trees will be stripped by bears. Bears generally quit stripping trees once other foods become available during the late spring or early summer. One approach to reducing damage has been to provide supplemental feed (pellets resembling dog food) in stands being damaged by bears. In one study, damage was just one-fifth as much in stands with feeders as in stands without feeders. Killing bears in areas where trees are being stripped can also reduce damage. Other approaches, such as relocation, contraception or sterilization, or repellents, are not generally practical for protecting forest plantations.

Timber Damage by Black Bears

Timber Damage by Black Bears PDF Author: Dale L. Nolte
Publisher:
ISBN:
Category : Black bear
Languages : en
Pages : 14

Get Book Here

Book Description
Describes alternative approaches to controlling the damage black bears cause during the spring when they strip bark to eat the newly formed wood underneath. One bear might strip as many as 70 trees in a day. The trees will be damaged and may be killed if the bark is stripped all the way around the tree, girdling it. Bears appear to strip the most vigorous trees, preferring stands that have been thinned, or those where urea fertilizer has been applied. Bears also appear to prefer trees with a high concentration of sugars relative to the concentration of terpenes. Pruning decreases the sugar-to-terpene ratio, reducing the likelihood that trees will be stripped by bears. Bears generally quit stripping trees once other foods become available during the late spring or early summer. One approach to reducing damage has been to provide supplemental feed (pellets resembling dog food) in stands being damaged by bears. In one study, damage was just one-fifth as much in stands with feeders as in stands without feeders. Killing bears in areas where trees are being stripped can also reduce damage. Other approaches, such as relocation, contraception or sterilization, or repellents, are not generally practical for protecting forest plantations.

General Technical Report PNW-GTR

General Technical Report PNW-GTR PDF Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 1136

Get Book Here

Book Description


Bears--their Biology and Management

Bears--their Biology and Management PDF Author: Clifford J. Martinka
Publisher:
ISBN:
Category : Bears
Languages : en
Pages : 390

Get Book Here

Book Description


Assessment and Management of Animal Damage in Pacific Northwest Forest

Assessment and Management of Animal Damage in Pacific Northwest Forest PDF Author:
Publisher:
ISBN:
Category : Forest protection
Languages : en
Pages : 380

Get Book Here

Book Description


Research Update

Research Update PDF Author: Denver Wildlife Research Center
Publisher:
ISBN:
Category : Wildlife research
Languages : en
Pages : 94

Get Book Here

Book Description


Research Update

Research Update PDF Author: National Wildlife Research Center (U.S.)
Publisher:
ISBN:
Category : Wildlife management
Languages : en
Pages : 142

Get Book Here

Book Description


General Technical Report RM.

General Technical Report RM. PDF Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 220

Get Book Here

Book Description


Silvicultural Approaches to Animal Damage Management in Pacific Northwest Forests

Silvicultural Approaches to Animal Damage Management in Pacific Northwest Forests PDF Author:
Publisher:
ISBN:
Category : Forest protection
Languages : en
Pages : 440

Get Book Here

Book Description


The Black Bear in Modern North America

The Black Bear in Modern North America PDF Author: Dale A. Burk
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 336

Get Book Here

Book Description


Old-growth Forests in the Southwest and Rocky Mountain Regions

Old-growth Forests in the Southwest and Rocky Mountain Regions PDF Author:
Publisher:
ISBN:
Category : Old growth forests
Languages : en
Pages : 208

Get Book Here

Book Description