Northwestern Crow (Corvus caurinus)

1999 ◽  
Author(s):  
N. A. Verbeek ◽  
Robert W. Butler
Keyword(s):  
Corvus Caurinus ◽  
Northwestern Crow

Northwestern Crow (Corvus caurinus)

1999 ◽  
Author(s):  
N. A. Verbeek ◽  
Robert W. Butler
Keyword(s):  
Corvus Caurinus ◽  
Northwestern Crow

COOPERATIVE BREEDING OF THE NORTHWESTERN CROW CORVUS CAURINUS IN BRITISH COLUMBIA

Ibis ◽  
2008 ◽  
Vol 123 (2) ◽  
pp. 183-189 ◽  
Author(s):  
Nicolaas A. M. Verbeek ◽  
Robert W. Butler
Keyword(s):  
British Columbia ◽  
Cooperative Breeding ◽  
Corvus Caurinus ◽  
Northwestern Crow

Natal pterylosis of the northwestern crow, Corvus caurinus

1991 ◽  
Vol 69 (6) ◽  
pp. 1534-1537 ◽  
Author(s):  
Nicolaas A. M. Verbeek
Keyword(s):  
British Columbia ◽  
The Body ◽  
Strait Of Georgia ◽  
Corvus Caurinus ◽  
Northwestern Crow

The number of natal down feathers (neossoptiles) and their arrangement in specific feather tracts of the body (pterylosis) are given for 19 nestlings of the northwestern crow, Corvus caurinus, from the Strait of Georgia, British Columbia. The natal pterylosis of the northwestern crow is compared with that of other members of the genus Corvus in the Nearctic and Palearctic regions. This comparison points out several differences in the capital, abdominal, and caudal tracts within the genus.

Northwestern Crow (Corvus caurinus)

2020 ◽  
Author(s):  
N. A. Verbeek ◽  
Robert W. Butler
Keyword(s):  
Corvus Caurinus ◽  
Northwestern Crow

Clam storage in a Northwestern Crow (Corvus caurinus): dispersion and sequencing

1985 ◽  
Vol 63 (4) ◽  
pp. 857-860 ◽  
Author(s):  
Paul C. James ◽  
Nicolaas A. M. Verbeek
Keyword(s):  
Experimental Study ◽  
British Columbia ◽  
Nearest Neighbour ◽  
Recovery Sequence ◽  
Neighbour Distance ◽  
Corvus Caurinus ◽  
Northwestern Crow ◽  
Very High ◽  
Sequence Position ◽  
Made In

An experimental study of clam storage by a Northwestern Crow (Corvus caurinus) was carried out on Mitlenatch Island, British Columbia, Canada. The crow was trained to take clams from a feeding table. His dispersion of the clams was studied using nearest-neighbour distance (NND). The distance clams were carried and the sequence of storage and recovery was also quantified. Median NND was significantly correlated with storage sequence position, as was NND with distance carried. The crow tended to recover the clams in the same order as he stored them, as storage sequence position was significantly correlated with recovery sequence position. The results were compared with other spatiotemporal studies of avian food hoarding. Recovery success of the crow was very high, he appeared to use memory to relocate his caches, as the majority of them were made in new sites, and he never revisited those already emptied.

Northwestern Crow (Corvus caurinus)

1999 ◽  
Author(s):  
N. A. Verbeek ◽  
Robert W. Butler
Keyword(s):  
Corvus Caurinus ◽  
Northwestern Crow

scholarly journals Ecological interactions and habitat modification in nesting Common Murres, Uria aalge

1996 ◽  
Vol 6 (3) ◽  
pp. 261-269 ◽  
Author(s):  
Julia K. Parrish ◽  
Robert T. Paine
Keyword(s):  
Reproductive Output ◽  
Habitat Modification ◽  
Haliaeetus Leucocephalus ◽  
Uria Aalge ◽  
Ecological Interactions ◽  
Bald Eagles ◽  
Predator Removal ◽  
Common Murre ◽  
Corvus Caurinus ◽  
Common Murres

SummarySeabird populations suffer from a variety of natural and human-induced sources of mortality and loss of lifetime reproductive output. On the outer coast of Washington State, Common Murre Uria aalge populations have been in decline for approximately the last decade and are currently reproductively active only at Tatoosh Island. These murres nest in two basic habitat types: crevices (25% of the population) and larger cliff-top subcolonies (75%). Murres in cliff-top subcolonies have suffered dramatic reductions in reproductive success in recent years relative to conspecifics nesting in the crevices, primarily due to egg predation by Glaucous-winged Gulls Larus glaucescens and Northwestern Crows Corvus caurinus, facilitated by the presence of Bald Eagles Haliaeetus leucocephalus. Because predator removal is not feasible and creation of additional crevice habitat is difficult, expensive and potentially ineffective, we have designed a temporary habitat modification (the “silk forest”) which replaces the natural vegetation cover and modifies the interaction between murres and eagles. Within the test subcolony, murres nesting under and immediately adjacent to the silk forest produced nearly twice as many eggs per square metre as their conspecifics nesting in adjacent exposed-ground areas.

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