scholarly journals A case study about foraging behavior of Butastur indicus using a video camera in Chiba Prefecture

2014 ◽  
Vol 40 (1) ◽  
pp. 289-292
Author(s):  
Yoshihiro TOKUE ◽  
Fumiko IMAMURA
Keyword(s):  
Foraging Behavior ◽  
Video Camera ◽  
Chiba Prefecture

Biomechanical Analysis of a World Record Javelin Throw: A Case Study

1985 ◽  
Vol 1 (1) ◽  
pp. 73-77 ◽  
Author(s):  
Robert J. Gregor ◽  
Marilyn Pink
Keyword(s):  
High Speed ◽  
Video Camera ◽  
The United States ◽  
Track And Field ◽  
Biomechanical Analysis ◽  
World Record ◽  
High Speed Video ◽  
High Speed Video Camera ◽  
Ongoing Project

As part of an ongoing project to evaluate elite track and field throwers in the United States, the javelin competition was filmed during the 1983 Pepsi Invitational Track Meet. A high-speed video camera (Spin Physics SP2000) was positioned orthogonal to the javelin runway to record the release of all throws. During this competition, Tom Petranoff’s world record (99.72 m) was filmed at 200 fields per second. Subsequent frame-by-frame digitization yielded results consistent with reports in the literature. Release velocity was 32.3 m/s and represents one of the highest values ever reported. Angle of release was .57r, javelin attitude at release was .64r» and angle of attack was .07r. While optimum values for these release parameters, in light of published results, remain open to discussion, the results presented here represent unique information on a world record performance and can serve as a basis of comparison for future performances.

Home Range and Movement Pattern of a Tailless Black Eagle in Taiwan: A Special Case of Noninvasive Study by Community Science

2021 ◽  
Author(s):  
Wen-Horn Lin ◽  
Shiao-Yu Hong ◽  
Si-Min Lin
Keyword(s):  
Home Range ◽  
Foraging Behavior ◽  
Movement Pattern ◽  
Home Range Size ◽  
Range Size ◽  
Taipei City ◽  
Community Science ◽  
North And South ◽  
Special Case

ABSTRACT A secretive and cautious raptor, the Black Eagle (Ictinaetus malaiensis) is challenging to study. Its highly specialized foraging behavior makes it difficult to capture an individual for tracking. However, a tailless eagle provided an opportunity to describe the home range and movements of one bird for 3 yr from 2013 to 2016. A total of 43 independent photo records were provided by a bird photographers' community. The eagle regularly moved between summering and wintering habitats north and south of Taipei City, Taiwan; home range sizes were estimated as 54.1 and 47.1 km2, respectively. This noninvasive case study provides the first estimates of home range size and movement patterns for the Black Eagle, and highlights the contribution of community science to research on endangered raptors.

Sub-ice foraging behavior of emperor penguins

2000 ◽  
Vol 203 (21) ◽  
pp. 3275-3278 ◽  
Author(s):  
P.J. Ponganis ◽  
R.P. Van Dam ◽  
G. Marshall ◽  
T. Knower ◽  
D.H. Levenson
Keyword(s):  
Foraging Behavior ◽  
Prey Capture ◽  
Video Camera ◽  
Foraging Strategy ◽  
Video Technology ◽  
Emperor Penguins ◽  
Behavioral Studies ◽  
Pagothenia Borchgrevinki ◽  
The Mean ◽  
Underwater Video Camera

Emperor penguins (Aptenodytes forsteri) were equipped with a remote underwater video camera, the Crittercam, to evaluate sub-ice foraging behavior while the birds dived from an isolated dive hole. Three birds dived and foraged successfully for 1 h periods after being trained to wear and to dive with a harness for camera attachment. Video and depth profile recordings revealed that emperor penguins travel at shallow depths (<50 m), ascend to the undersurface of the ice to feed on fish, and descend back to depth to return to the exit hole. Although the mean durations of dives of individual birds with the Crittercam were 21–35 % shorter than the diving durations of these same birds without the camera, the dive profiles in both situations were similar, thus demonstrating a similar foraging strategy in birds diving without the camera. Despite shorter diving durations with the camera, the penguins were still successful at prey capture in 80 % of 91 dives greater than 1 min in duration. Prey included the sub-ice fish Pagothenia borchgrevinki. Hunting ascents (from depth to within 5 m of the surface) occurred in 85 % of dives, ranged from zero to three per dive, and were associated with successful prey capture in 77 % of 128 ascents. Occasionally, several fish were captured during a single ascent. These observations and this application of video technology create a model for further physiological and behavioral studies of foraging, and also emphasize the potential importance of shallow dives as sources of food intake for emperor penguins during foraging trips to sea.

Sign in / Sign up

Export Citation Format

Share Document