Saskatchewan Spring Bird Migration – 1982

West Country Physicians Club, Spring Meeting 1982

Surgical Club of South West England, Spring Meeting 1982

Percutaneous transluminal angioplasty (PTA) using the Gruntzig balloon catheter was undertaken to improve the arterial blood supply of 21 ischaemic lower limbs a total of 18 iliac and six superficial femoral dilatations. Results have been assessed at 2-23 months (median nine months), as relief of ischaemic pain and improvement in systolic pressures and Doppler waveforms. The patency of dilated ...

Monitoring bird migration by weather radar

Spatiotemporal information on bird migration is of invaluable use to scientists and society alike, but so far no sensor networks have been established that can monitor bird movement continuously over large areas. In aviation bird migration information is important for improving flight safety. Especially military low level flying has a high risk of en-route bird strikes and spatial bird migratio...

Weather and bird migration Norman Elkins

© British Birds 98 • May 2005 • 238-256 ABSTRACT Bird migration in and through Britain and Ireland shows great variation, both seasonally and annually. Much depends on atmospheric conditions, which can equally hinder and assist migration, both on a broad scale (the distribution, extent, intensity and movement of pressure patterns), and at a local level (temporal and spatial changes in wind, vis...

The Evolution of Differential Bird Migration

of Baker's View of Avian Migration Baker (197S) defines migration to include any non-accidental movement by a metazoan from one spatial unit to another' He assumes It at migrations have evolved because they are, or historically have been' "J"piitat the level of individual selection' (As he puts it, chickens cross the road because they find conditions sufficiently better on the other side to hav...