Hunting Tactics of Peregrines and Other Falcons Hunting Tactics of Peregrines and Other Falcons. Dick Dekker . 2009. Hancock House Publishers. Surrey, British Columbia, Canada. 192 pp., 15 black and white photographs, 9 color prints, numerous tables and graphs. ISBN 978-0-88839-683-9. Paper, $29.95.

2010 ◽  
Vol 44 (4) ◽  
pp. 331-332
Author(s):  
Joseph B. Buchanan
Keyword(s):  
British Columbia ◽  
Black And White ◽  
Hunting Tactics

Observations on the migrations of North Pacific humpback whales (Megaptera novaeangliae)

1985 ◽  
Vol 63 (2) ◽  
pp. 308-314 ◽  
Author(s):  
James D. Darling ◽  
Daniel J. McSweeney
Keyword(s):  
British Columbia ◽  
North Pacific ◽  
Ventral Side ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Prince William Sound ◽  
White Pigment ◽  
Southeast Alaska ◽  
Black And White ◽  
Northeast Pacific

Migratory destinations of northeast Pacific humpback whales (Megaptera novaeangliae) were determined by repeat sightings of photographically identified individuals, using the black and white pigment patterns on the ventral side of the flukes. Individuals identified between 1975 and 1982 included 1056 in Hawaii, 420 in southeast Alaska, 54 in Prince William Sound, Alaska, 8 in British Columbia, and 12 in the Revillagigedo Islands, Mexico. Of these, 51 were found in Hawaii and southeast Alaska, 8 in Hawaii and Prince William Sound, 1 in Hawaii and British Columbia, and 1 in Mexico and Hawaii. Some travelled for four, five, and six successive seasons between Hawaii and southeast Alaska. One whale was found in British Columbia one summer and in southeast Alaska the next; the same individuals were commonly found off both Kona, Hawaii, and West Maui in winter. The study suggests that separate summer feeding areas may exist in the northeast Pacific where individuals prefer to feed. Migratory connections suggest that all humpbacks in the eastern North Pacific are of the same stock.

Orientation and drifting behaviour of bumblebees (Hymenoptera: Apidae) in commercial tomato greenhouses

2004 ◽  
Vol 82 (1) ◽  
pp. 52-59 ◽  
Author(s):  
Anna L Birmingham ◽  
Mark L Winston
Keyword(s):  
British Columbia ◽  
Nest Entrance ◽  
Major Contributor ◽  
Management Options ◽  
Novel Environment ◽  
Substantial Loss ◽  
Black And White ◽  
Bombus Occidentalis ◽  
Orientation Cues ◽  
Greenhouse Tomatoes

A novel environment lacking in directional cues may present orientation challenges to foraging bees. We examined orientation and drifting behaviour of Bombus occidentalis Greene and Bombus impatiens Cresson, the two major bumblebee pollinators of greenhouse tomatoes in British Columbia. Our objectives were to establish the extent and frequency of bee drift into foreign colonies and to examine the potential of nest entrance patterns and landmarks to reduce drift in commercial greenhouses. On average, 28% of marked bumblebees drifted into foreign hives, making up 0.3%–34.8% of the population in those colonies. Bees drifted towards the top position when hives were vertically stacked. The use of simple black and white patterns and large landmarks did not affect the number of drifting bees, suggesting that disorientation is not a major contributor to drift or to the substantial loss of adult bees from colonies during their first week in a greenhouse. Bees had decreased foraging times when landmarks were present in the greenhouse and showed a marginally but not significantly increased rate of pollen input to colonies. These studies contribute to understanding bumblebee behaviour in a novel environment and determining whether orientation cues are feasible management options to reduce drift and potential bee loss.

Sign in / Sign up

Export Citation Format

Share Document