Douglas-fir Clippings by American Red Squirrels (Tamiasciurus hudsonicus): A Potential Winter Food Source for Mule Deer (Odocoileus hemionus)

2011 ◽  
Vol 92 (1) ◽  
pp. 72-76
Author(s):  
Roy V. Rea ◽  
Dexter P. Hodder ◽  
Inka Lücke
Keyword(s):  
Food Source ◽  
Mule Deer ◽  
Odocoileus Hemionus ◽  
Douglas Fir ◽  
Tamiasciurus Hudsonicus ◽  
Red Squirrels ◽  
Winter Food

The Impact of Logging on Red Squirrels in an Idaho Conifer Forest

1986 ◽  
Vol 1 (3) ◽  
pp. 73-76 ◽  
Author(s):  
Dean E. Medin
Keyword(s):  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Tamiasciurus Hudsonicus ◽  
Red Squirrel ◽  
Conifer Forest ◽  
Population Densities ◽  
Red Squirrels ◽  
Before And After ◽  
Second Year ◽  
The Impact

Abstract Red squirrel (Tamiasciurus hudsonicus) population densities were studied on logged and unlogged plots in an Idaho Douglas-fir (Pseudotsuga menziesii) forest. Squirrel population densities were estimated before and after logging by using spot-mapping methods. In the unlogged forest, we estimated 0.75 to 1.25 individuals/ac, but in the second year after logging there were only 0.05 to 0.08 squirrels/ac. Red squirrel densities on logged study plots were less than one-fifth those on unlogged plots. West. J. Appl. For. 1:73-76 July 1986.

Winter food habits and foraging behaviour of fishers (Martes pennanti) and martens (Martes americana) in southeastern Manitoba

1987 ◽  
Vol 65 (3) ◽  
pp. 745-747 ◽  
Author(s):  
R. Michael Raine
Keyword(s):  
Food Habits ◽  
Foraging Behaviour ◽  
Martes Americana ◽  
Tamiasciurus Hudsonicus ◽  
Martes Pennanti ◽  
Red Squirrels ◽  
Snowshoe Hares ◽  
Pine Martens ◽  
Winter Food ◽  
Frequency Occurrence

A tracking study of fishers, Martes pennanti, and American pine martens, Martes americana, conducted over two winters in southeastern Manitoba showed that both species preyed heavily on snowshoe hares, Lepus americanus, during a period of hare abundance. Fishers had an 84.3% frequency occurrence (n = 159) of hares in their scats, while martens had a frequency occurrence of 58.9% (n = 107). Martens had a higher frequency of microtincs and red squirrels, Tamiasciurus hudsonicus, in their diets than did fishers. This difference was reflected in the foraging behaviour of the two species, with martens exhibiting more subnivean and arboreal behaviour than fishers.

scholarly journals Potential of Small Culverts as Wildlife Passages on Forest Roads

2021 ◽  
Vol 13 (13) ◽  
pp. 7224
Author(s):  
Hsiang-Ling Chen ◽  
Erin E. Posthumus ◽  
John L. Koprowski
Keyword(s):  
Animal Movement ◽  
Small Dimension ◽  
Lynx Rufus ◽  
Tamiasciurus Hudsonicus ◽  
Red Squirrels ◽  
Forest Roads ◽  
Alternative Pathways ◽  
Slow Moving ◽  
Trail Cameras ◽  
Spermophilus Variegatus

Roads and traffic can cause animal mortality. Specifically, roads serve as barriers by impeding animal movement, resulting in demographic and genetic consequences. Drainage structures, such as culverts, can provide linkages between habitat patches. However, the potential of small culverts with diameters of <60 cm (e.g., wildlife passages that facilitate movement on forest roads) are relatively unknown. In this study, we used trail cameras to monitor the use of 14 small culverts, by mammals, along forest roads on Mt. Graham, home of the critically endangered Mt. Graham red squirrels (Tamiasciurus hudsonicus grahamensis), in southeastern Arizona, USA. From 2011 to 2013, we only recorded 20 completed road crossings through culverts. More than half of culvert uses were by striped skunks (Mephitis mephitis), followed by the rock squirrel (Spermophilus variegatus) and the bobcat (Lynx rufus). The Mt. Graham red squirrel was the only species that was common along the roads, but never crossed the roads. Culverts with higher usages were characterized by shorter culvert lengths and absence of accumulated soil inside the culverts. Our study shows that small-dimension drainage systems may provide alternative pathways for wildlife crossing roads, especially for slow moving and ground dwelling species. However, the potential of small culverts assisting wildlife crossings can only be maximized when culverts are accessible year-round.

Tolazoline-Induced Apnea in Mule Deer (Odocoileus hemionus)

2011 ◽  
Vol 42 (1) ◽  
pp. 105-107 ◽  
Author(s):  
Jack Alan Mortenson ◽  
Jason Andrew Robison
Keyword(s):  
Mule Deer ◽  
Odocoileus Hemionus

Jack pine cone quality and cache sizes of red squirrels in southern New Brunswick, Canada

1997 ◽  
Vol 75 (2) ◽  
pp. 332-335 ◽  
Author(s):  
Michael A. Setterington ◽  
Daniel M. Keppie
Keyword(s):  
New Brunswick ◽  
Pinus Banksiana ◽  
Seed Mass ◽  
Dry Mass ◽  
Jack Pine ◽  
Tamiasciurus Hudsonicus ◽  
Red Squirrels ◽  
Length Width ◽  
Total Seed ◽  
Number Of Seeds

Relationships between external cone characteristics (length, width, wet and dry mass), cone quality (total seed mass as a proportion of cone mass, total number of seeds per cone, total seed mass per cone), and number of cones in caches were evaluated for caches of jack pine (Pinus banksiana) cones belonging to red squirrels (Tamiasciurus hudsonicus) in two plantations in southern New Brunswick. Cone length and mass were good predictors of the total number of seeds per cone and total seed mass per cone. Length accounted for a small proportion of the variance of total seed mass as a proportion of cone mass. There was no relationship between the number of seeds or total seed mass per cone and the number of cones per cache.

Growth and seasonal weight changes as they relate to spring and autumn set points in mule deer

1991 ◽  
Vol 69 (3) ◽  
pp. 744-747 ◽  
Author(s):  
Lyle A. Renecker ◽  
W. M. Samuel
Keyword(s):  
Growth Rate ◽  
Weight Loss ◽  
Weight Gain ◽  
Mule Deer ◽  
Odocoileus Hemionus ◽  
Weight Changes ◽  
Annual Cycles ◽  
Body Weights ◽  
Compensatory Gain ◽  
Highly Correlated

Growth rate and potential, 25 hand-reared mule deer (Odocoileus hemionus hemionus) were examined. When possible, body weights of all animals were recorded weekly. Female deer matured faster than males, but males attained a larger body size. Regressions of winter weight loss of both sexes on peak autumn weight were highly correlated. Similarly, spring and summer compensatory gain in females could be predicted from the minimum spring weight. Annual cycles of intake and weight gain may have adaptations that improve reproductive success and winter survival.

SEASONAL DAMAGE BY INSECTS AND SQUIRRELS TO FEMALE REPRODUCTIVE STRUCTURES OF BLACK SPRUCE, PICEA MARIANA (MILL.) B.S.P.

1988 ◽  
Vol 120 (12) ◽  
pp. 1113-1121 ◽  
Author(s):  
Y.H. Prévost ◽  
J.E. Laing ◽  
V.F. Haavisto
Keyword(s):  
Picea Mariana ◽  
Black Spruce ◽  
Choristoneura Fumiferana ◽  
Tamiasciurus Hudsonicus ◽  
Red Squirrel ◽  
Red Squirrels ◽  
Reproductive Structures ◽  
Cone Axis ◽  
Viable Seeds ◽  
Cone Growth

AbstractThe seasonal damage to female reproductive structures (buds, flowers, and cones) of black spruce, Picea mariana (Mill.) B.S.P., was assessed during 1983 and 1984. Nineteen insects (five Orders) and the red squirrel, Tamiasciurus hudsonicus (Erxleben), were found feeding on these reproductive structures. Collectively, these organisms damaged 88.9 and 53.5% of the cones in 1983 and 1984, respectively. In the 2 years, Lepidoptera damaged 61.8% of the cones in 1983 and 44.4% of the cones in 1984. The spruce budworm, Choristoneura fumiferana (Clem.), and the spruce coneworm, Dioryctria reniculelloides Mut. and Mun., were the most important pests. Cones damaged by Lepidoptera could be classed into three categories: (a) severe, yielding no seeds; (b) moderate, yielding 22.3 seeds per cone; and (c) light, yielding 37.5 seeds per cone. Undamaged cones yielded on average 39.9 seeds per cone. Red squirrels removed 18.8% of the cones in 1983 and none in 1984. The spruce cone axis midge, Dasineura rachiphaga Tripp, and the spruce cone maggot, Lasiomma anthracinum (Czerny), caused minor damage in both years. Feeding by spruce cone axis midge did not reduce cone growth significantly or the number of viable seeds per cone, but feeding by the spruce cone maggot did. During both years new damage by insects to the female reproductive structures of the experimental trees was not observed after mid-July. In 1983 damage by red squirrels occurred from early to late September. In 1984 damage to cones on trees treated with dimethoate was 15.6% compared with 53.5% for untreated trees, without an increase in the number of aborted cones.

scholarly journals Adjacency to a harvest trail increases drought resistance of interior Douglas-fir (Pseudotsuga menziesii var. glauca) in partially harvested stands in central British Columbia

2018 ◽  
Vol 48 (7) ◽  
pp. 809-820 ◽  
Author(s):  
Neil P. Thompson ◽  
Kathy J. Lewis ◽  
Lisa M. Poirier
Keyword(s):  
British Columbia ◽  
Drought Tolerance ◽  
Pseudotsuga Menziesii ◽  
Growth Rates ◽  
Habitat Management ◽  
Odocoileus Hemionus ◽  
Douglas Fir ◽  
Ring Analysis ◽  
The Relationship

Drought tolerance of trees may be affected by competition, but most studies quantifying the relationship do not consider the effect of stem clustering. Trees are often clustered in interior Douglas-fir (Pseudotsuga menziesii var. glauca (Mayr) Franco) forests near the grassland interface in central British Columbia due to past harvesting practices or habitat management for mule deer (Odocoileus hemionus hemionus (Rafinesque, 1817)). Climate change projections indicate continued increases in temperature, an outcome that would stress trees growing in dry environments. Trees placed in different states of competition by mechanical harvesting in the 1970s were sampled to provide a 40-year comparison of three levels of competition during 1–2 year droughts. Tree-ring analysis was used to assess the reduction in growth during drought years and resumption of growth in subsequent years. A clear separation of growth rates was evident between open-growing trees, trees on the edge of harvesting trails, and trees within the unharvested interior. Edge trees had intermediate growth rates but no differences were found in the long-term climate–growth relationship compared with open-growing trees. Both Edge and Open classes showed less relative growth reduction during droughts than Interior trees growing between harvest trails. Precipitation throughfall rates and competition for resources are likely driving short-term drought tolerance in combination with other factors.

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