Canada Jay (Perisoreus canadensis)

2020 ◽  
Author(s):  
Dan Strickland ◽  
Henri R. Ouellet
Keyword(s):  
Perisoreus Canadensis

Multistage Scatter-Hoarding Decisions in the Gray Jay (Perisoreus canadensis)

Bird Behavior ◽  
1997 ◽  
Vol 12 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Thomas A. Waite ◽  
John D. Reevet
Keyword(s):  
Scatter Hoarding ◽  
Perisoreus Canadensis

A test of the predator avoidance hypothesis to explain delayed onset of communal breeding

2019 ◽  
Vol 97 (4) ◽  
pp. 332-339
Author(s):  
D. Strickland ◽  
E. Brouwer ◽  
T.M. Burg
Keyword(s):  
Predator Avoidance ◽  
Group Living ◽  
Breeding Cycle ◽  
Communal Breeding ◽  
The Family ◽  
Perisoreus Canadensis ◽  
Insufficient Time ◽  
Anticosti Island ◽  
Free Environment ◽  
Late Stages

A neglected question in the study of communal breeding concerns why alloparental behaviour begins at variously late stages in the breeding cycle. In group-living corvids, the delay tends to be longer in species that are small and (or) typically have only a small nonbreeder complement. This pattern has been attributed to the relatively poor defensive capabilities of such species and their consequently greater need to minimize predator-attracting traffic to the nest or fledglings. We tested this predator avoidance hypothesis with the Canada Jay (Perisoreus canadensis (Linnaeus, 1766)), a species in which the feeding of young by any nonbreeders in the family group is delayed until the fledgling period. We reasoned that, on Anticosti Island, Quebec (Canada), in the absence of squirrels and other nest predators, nonbreeders might be permitted to feed nestlings as well as fledglings, and that breeders might feed nestlings more frequently (with smaller food loads) than on the mainland. We found no evidence for either prediction and thus no support for the predator avoidance hypothesis but suggest that Anticosti Canada Jays may have had insufficient time to evolve behaviour more appropriate for their predator-free environment. Secondarily, we confirmed that in all observed instances, the nonbreeders were offspring of the breeding pair from previous years and that they therefore failed to provision nestlings in spite of an apparent genetic interest to do so.

Erroneous choice and foregone gains in hoarding gray jays ( Perisoreus canadensis )

2000 ◽  
Vol 3 (3) ◽  
pp. 127-134 ◽  
Author(s):  
T. A. Waite ◽  
K. L. Field
Keyword(s):  
Gray Jays ◽  
Perisoreus Canadensis

scholarly journals Weight-carrying Ability and Caching Behavior of Gray Jays, Perisoreus canadensis: Adaptations to Boreal Winters

2005 ◽  
Vol 119 (1) ◽  
pp. 101 ◽  
Author(s):  
Lynn L. Rogers
Keyword(s):  
Body Weight ◽  
Boreal Forest ◽  
Corvus Corax ◽  
Gray Jays ◽  
Risk Of Predation ◽  
Perisoreus Canadensis ◽  
Flight Loads ◽  
Insect Activity ◽  
Weight Carrying ◽  
Ability And Willingness

During 16 August to 21 September 1984, I determined how Gray Jays (Perisoreus canadensis) carried flight-loads of different weights. Three individually identifiable Gray Jays weighing 60, 68, and 80 grams, used their bills to carry flight-loads weighing up to 33 percent of bodyweight but transferred heavier flight-loads from their bills to their feet 1-2 meters after takeoff. They had difficulty carrying flight-loads over 57 percent of bodyweight, and none attempted to carry flight-loads over 66 percent of bodyweight. By using their feet to bring heavy flight-loads closer to the center of lift, Gray Jays can carry heavier loads of meat, relative to body weight, than can Common Ravens (Corvus corax) which compete with Gray Jays at carcasses in winter and which do not carry objects with their feet. During 1969-2003, year-round observations near the southern edge of the Gray Jay range in northeastern Minnesota showed that caching behavior begins in August, continues over-winter, and ends at the onset of insect activity and green-up in early May. Gray Jays’ propensity to approach larger animals, including people, may not indicate unwariness but rather a superior ability and willingness to assess risks and food benefits. In the boreal forest in winter, risk of starvation is greater and risk of predation is lower than in relatively food-rich ecoregions farther south.

Gray Jay (Perisoreus canadensis) Agonistic Displays

1992 ◽  
Vol 73 (1) ◽  
pp. 22
Author(s):  
Katherine A. Luhring ◽  
James C. Ha ◽  
Philip N. Lehner
Keyword(s):  
Perisoreus Canadensis

The behaviour of grey jays, Perisoreus canadensis, towards palatable and unpalatable Lepidoptera

1990 ◽  
Vol 39 (4) ◽  
pp. 699-705 ◽  
Author(s):  
M. Deane Bowers ◽  
Sean Farley
Keyword(s):  
Perisoreus Canadensis

Selective Predation of Gray Jays, Perisoreus canadensis, Upon Boreal Chorus Frogs, Pseudacris triseriata

Evolution ◽  
1980 ◽  
Vol 34 (5) ◽  
pp. 1004 ◽  
Author(s):  
Walter Tordoff III
Keyword(s):  
Selective Predation ◽  
Gray Jays ◽  
Chorus Frogs ◽  
Perisoreus Canadensis

scholarly journals A Nest Predator's View of a Managed Forest: Gray Jay (Perisoreus Canadensis) Movement Patterns in Response to Forest Edges

The Auk ◽  
2004 ◽  
Vol 121 (1) ◽  
pp. 162-169 ◽  
Author(s):  
Jacques Ibarzabal ◽  
André Desrochers
Keyword(s):  
Coniferous Forest ◽  
Movement Patterns ◽  
Forest Edge ◽  
Early Summer ◽  
Forest Edges ◽  
Artificial Nests ◽  
Gray Jays ◽  
Perisoreus Canadensis ◽  
Mature Stands ◽  
Nest Predators

Abstract High nest-predation risk is often associated with forest edges. Most nest predators in boreal coniferous forests of North America are forest specialists living in mature stands. Nest predators have been studied mainly through use of artificial nests; knowledge of their behavior remains limited. We used radiotelemetry to examine movement patterns, relative to forest edge, of a forest nest predator, the Gray Jay (Perisoreus canadensis), in boreal coniferous forest. Each of 11 family groups of Gray Jays monitored in early summer exhibited a marked association with forest edges. Jays were found within 30 m of the forest edges more often than expected from random use of mature forest. Furthermore, jays traveled more slowly near forest edges than in the forest interior. Because forest edges apparently represent prime foraging habitat for Gray Jays, narrow forest strips left by logging could act as ecological traps for mature-stand songbirds before stands regenerate in adjacent clearcuts.

Canada Jay (Perisoreus canadensis)

2011 ◽  
Author(s):  
Dan Strickland ◽  
Henri R. Ouellet
Keyword(s):  
Perisoreus Canadensis
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