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  • 1
    Electronic Resource
    Electronic Resource
    Cover and efficacy of predator-based repellents for Townsend's voleMicrotus townsendii (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 401-412 
    Details
    ISSN: 1573-1561
    Keywords: Wildlife damage ; Townsend's vole ; Microtus townsendii ; predator odors ; repellents ; cover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Predator-based repellents have been used experimentally to control wildlife damage in both agriculture and forestry, but they have not always been effective. We examined the relative importance of cover and predator odors in forage patch selection by Townsend's vole,Microtus townsendii, and its behavior related to cover and predator cues. Experiments were conducted in which forage patch and area choices were related to available habitat alternatives. Outdoor enclosures were divided into halves: one side was treated and the other used as a control. Treatments consisting of “cover,” “repellent,” and “cover plus repellent” were compared to controls (no cover, no repellent). In the absence of cover, voles preferred to feed on the side without repellents. When cover was present, voles preferred to feed on the side with cover, regardless of whether or not repellents were present. Voles visited more feeding stations on the side without cover when repellents and cover were present than they visited during cover-only treatments. These additional feeding stations, visited outside of cover, were used only lightly as food sources. The amounts of oats eaten by voles decreased with increasing distance from cover. This inverse relationship had a steeper slope in coveronly treatments compared to cover plus repellent treatments. A selection model based on forage patch selection and a habitat preference hierarchy is proposed. We conclude that predator odors are effective as repellents, but their efficacy depends on habitat conditions. Managers intending to use predator-based repellents must ensure that alternative sites available to pests are better quality habitat than in areas to be protected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994341
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of the plant antifeedant, pinosylvin, on suppression of feeding by snowshoe hares (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 1151-1164 
    Details
    ISSN: 1573-1561
    Keywords: Plant antifeedants ; pinosylvin ; pinosylvin methyl ether ; snowshoe hare ; Lepus americanus ; herbivore ; lodgepole pine ; forest plantation ; release devices ; feeding suppression ; crop protection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract This study investigated the influence of the plant antifeedants, pinosylvin and pinosylvin methyl ether (PME), on suppression of feeding by snowshoe hares (Lepus americanus). Screening bioassays showed clearly that pinosylvin suppressed feeding by hares when sprayed directly on coniferous tree seedlings. Pinosylvin odor, when associated with food (but not mixed with it), also significantly reduced consumption of rabbit chow by hares. Large pen bioassays indicated that both pinosylvin and PME significantly reduced feeding on tree seedlings by hares when the antifeedants were sprayed directly on trees. In field bioassays near Prince George, British Columbia, Canada, pinosylvin sprayed on trees and encapsulated in controlled-release devices of PVC plastic, with an internal wire as a twist-tie for attachment to tree, significantly reduced feeding by hares. Thus, pinosylvin will generate an “avoidance response” in terms of feeding by snowshoe hares. This response is likely triggered by an olfactory pathway based on positive results with controlledrelease devices attached to seedlings. Our study reports the first practical utilization of plant antifeedants for forest crop protection and wildlife management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980070
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of mustelid semiochemicals on population dynamics of the deer mouse (Peromyscus maniculatus) (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 667-689 
    Details
    ISSN: 1573-1561
    Keywords: Semiochemicals ; deer mouse ; weasel ; Mustela spp. ; interspecific communication ; Peromyscus maniculatus ; biological control ; vole ; Microtus spp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The influence of mustelid anal-gland compounds on population dynamics of the deer mouse (Peromyscus maniculatus) was investigated. Densities of deer mice were not found to be significantly different between treated and control areas. However, on average, numbers of deer mice were lower on treated areas following the July treatments of 1991 and 1992. Survival rates appeared to be lower and more erratic on treated than control areas in 1991; however, there were no statistically significant differences. Reproduction appeared to be unaffected by the odors. We concluded that deer mice did not display a behavioral response to weasel odors. We speculated that decreases in densities were owing to predation by weasels, which were attracted to the odors on treated sites. We also concluded that the use of weasel odors as a biological control method for voles (Microtus spp.) would likely have little impact on deer mice (a nontarget species).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059606
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  • 4
    Electronic Resource
    Electronic Resource
    Response of pocket gophers (Thomomys talpoides) to an operational application of synthetic semiochemicals of stoat (Mustela erminea) (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 941-949 
    Details
    ISSN: 1573-1561
    Keywords: Pocket gopher ; avoidance response ; mustelids ; 2-propylthietane ; 3-propyl-1,2-dithiolane ; 3,3-dimethyl-1,2-dithiolane ; anal-gland compounds ; operational application ; Thomomys talpoides ; Mustela spp. ; controlled-release devices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract This paper reports on laboratory bioassays and a large-scale field trial of synthetic mustelid anal-gland compounds in controlled-release devices designed for operational application to burrow systems of northern pocket gophers (Thomomys talpoides). The field study was conducted in an apple orchard in the Okanagan Valley of British Columbia. In laboratory bioassays, a 1∶1 mixture of 2-propylthietane and 3-propyl-1,2-dithiolane from the stoat (Mustela erminea) and 3,3-dimethyl-1,2-dithiolane from the ferret (M. putorius), dispensed in clay pellets (activated alumina), produced a significant avoidance response by gophers. All resident gophers were permanently removed from 4-ha control and treatment blocks prior to placement of stoat odor in burrows. As indexed by soil mounds, significantly fewer gophers colonized the treatment (40) than the control (68) removal area during a 5.5-month overwinter experiment. There was also a significant difference when comparing the number of mounds between pre-(79) and posttreatment (40) censuses. In addition, most gopher activity tended to occur on the perimeter of the treatment block. Abundance of gophers showed little difference between additional 4-ha control and treatment blocks where gophers had not been removed. The results of this study provide an alternative technique to toxicants for pocket gopher control on forest and agricultural land.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01016502
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of release devices for stoat (Mustela ermined) semiochemicals used as montane vole (Microtus montanus) repellents (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 951-957 
    Details
    ISSN: 1573-1561
    Keywords: Montane vole ; stoat ; release devices ; 2-propylthietane ; 3-propyl-1,2-dithiolane ; crop protection ; feeding suppression ; rubber septa ; capillary tubes ; plastic rope ; clay pellets ; Microtus montanus ; Mustela erminea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Fenced enclosures were used to simulate peak populations of montane voles (Microtus montanus) for field bioassays of a stoat (Mustela erminea) scent mixture in various controlled-release devices. A 1∶ 1 mixture of 2-propylthietane and 3-propyl-1,2-dithiolane was dispensed in capillary tubes, clay pellets (activated alumina), rubber septa, and plastic rope. Release devices were placed near, or attached to, young apple trees planted in blocks in two enclosures containing high populations of voles. The stoat scent mixture in rubber septa and plastic rope significantly reduced vole attack of trees compared with a control, pellets, and capillary tubes. In terms of complete girdling (tree mortality), this odor in septa and rope also significantly reduced feeding compared with the control, and the rubber septa formulation was more effective than either the pellets or capillary tubes. Fenced populations of voles may be used effectively to conduct field bioassays during low years in vole cycles. Variations of release devices (with this stoat scent mixture) based on rubber septa for broadcast application to depress vole population density and survival, and plastic rope attached to individual trees to generate an avoidance response, should be used for forest and agricultural crop protection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01016503
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  • 6
    Electronic Resource
    Electronic Resource
    Book review (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 529-532 
    Details
    ISSN: 1573-1561
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994251
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  • 7
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    Prediction of stand susceptibility to feeding damage by red squirrels in young lodgepole pine (1994)
    Canadian Science Publishing
    Details
    Publication Date: 1994-01-01
    Description: This paper provides a forecast model to predict when and where significant feeding damage by red squirrels (Tamiasciurushudsonicus Erxleben) will occur in managed stands of lodgepole pine (Pinuscontorta Dougl. var. latifolia Engelm.). Information from 51 managed stands (average DBH 〉 6.0 cm) in the interior of British Columbia and from past squirrel population studies was used to formulate the model. Incidence of damage was significantly greater in stands originating from wildfire than from harvesting. Stands within the Montane Spruce biogeoclimatic zone had the highest levels of damage of the five zones sampled. There was no relationship between damage incidence and average stand diameter, area of managed stand, or site class. In a subset of stands where understory shrub data were available, shrub cover was positively related to incidence of damage. Major factors in the forecast model that influence stand susceptibility include (i) stand origin and proximity to mature timber; (ii) frequency of cone crops leading to squirrel population increases in juvenile pine; and (iii) shrub cover, which may provide security from predators. Additional potential factors include (iv) switching of predators from squirrels to snow-shoe hares (Lepusamericanus Erxleben) during peak years of the hare cycle and (v) fertilization. A decisionmaking profile is outlined for prespacing surveys to identify susceptible stands.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 8
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    Feeding damage by bears in managed forests of western hemlock–western red cedar in midcoastal British Columbia (1993)
    Canadian Science Publishing
    Details
    Publication Date: 1993-01-01
    Description: This study measured the incidence of feeding damage in 1989 and 1990 by black bears (Ursusamericanus Pallas), and possibly by grizzly bears (Ursusarctos L.), within managed and unmanaged second-growth western hemlock (Tsugaheterophylla (Raf.) Sarg.)–western red cedar (Thujaplicata Donn) forest stands near Jennis Bay, 39 km northwest of Port Hardy, British Columbia. Tree mensuration (1989) and damage assessments (1989 and 1990) were conducted in 69 sample plots located in stands that were spaced in 1980 to 1982, when the trees were juvenile, and in 19 plots located in a nearby unspaced (control) stand. Western red cedar, which represented 13.6% of the managed stands, was the most severely damaged species (cumulative attack of 63.8% in 1989, increasing to 69.1% in 1990). Western hemlock, the major tree species, had
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 9
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    Influence of feeding damage by small mammals on tree growth and wood quality in young lodgepole pine (1993)
    Canadian Science Publishing
    Details
    Publication Date: 1993-05-01
    Description: This study assessed the impact of feeding injuries by snowshoe hare (Lepusamericanus Erxleben) and red squirrel (Tamiasciurushudsonicus Erxleben) on diameter growth, height growth, and wood quality of juvenile lodgepole pine (Pinuscontorta Dougl. var latifolia Engelm.) at Prince George and in the Cariboo Region, British Columbia. In the Prince George control stand, severe girdling damage (50–99% stem circumference) suppressed diameter and height growth of small-diameter (4.1–6.0 cm) trees, but had no effect on larger stems (6.1–8.0 cm). In the spaced stand, diameter and height increments also declined significantly with degree of partial girdling, particularly in small-diameter (3.1–5.0 cm) trees. Paradoxically, diameter increment increased significantly with degree of partial girdling in both stands at the Cariboo study area. Presumably squirrels prefer to feed on vigorous stems, and the lost growth of these trees may be substantial. There was no significant difference in amount of compression wood nor total solvent and water extractives between undamaged and damaged trees. Fiber lengths in wound-associated wood were consistently 19–21% lower than in controls. Damaged trees had greater average ring width and density than undamaged trees. The average increase in relative density of damaged over undamaged trees was 0.0343. These results suggest that a severe degree of partial girdling (which likely occurs more often in small-diameter trees) may significantly affect growth of lodgepole pine, particularly small (
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 10
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    Influence of Diversionary Food on Red Squirrel Populations and Damage to Crop Trees in Young Lodgepole Pine Forest (1993)
    Wiley
    Details
    Publication Date: 1993-11-01
    Print ISSN: 1051-0761
    Electronic ISSN: 1939-5582
    Topics: Biology
    Published by Wiley on behalf of Ecological Society of America.
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