Migration orientation

Migration orientation - Migration Part 3 Orientation Return...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Migration Part 3: Orientation Return to Hawaii, year after year. Parents leave when young are 5 weeks old. Bristle-thighed Curlew
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
An even more amazing journey Bar-tailed Godwit 6,800 miles 5-6 days, non-stop, over open ocean Vector for H5N1 strain of avian flu? and, even “proof of God” … http://www.answersingenesis.org/creation/v23/i4/m igration.asp?vPrint=1
Background image of page 2
Orientation apparent, even when not migrating Homing Pigeons (used in World War I) Manx Shearwater - flown across Atlantic - back in burrow 12 days later
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3 levels of navigation 1) Piloting . Using landmarks. Requires a “mental map ” of where landmarks are relative to each other. 2) Orientation . Ability to head in a fixed direction, without landmarks. Like having a compass. (Example: Starlings – young vs. old) 3) True Navigation . Ability to orient towards a specific place from anywhere. (Like having a map and compass) wintering area
Background image of page 4
What cues do birds use to navigate? 1. Landmarks Flying at high altitudes, birds can see large expanses (at 600m height, bird can see a radius of 100km). Rivers, shorelines, mountain ranges, even roads Homing pigeons did better when released on a clear day… BUT, put frosted contact lenses on them and they can still find their way home! (But can’t get in the hole in their roost…)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
When good experiments are badly interpreted….
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 08/24/2011.

Page1 / 19

Migration orientation - Migration Part 3 Orientation Return...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online