File Details
- Depositor
- Karen Dykes
- Date Uploaded
- 2021-12-08
- Date Modified
- 2021-12-08
- Fixity Check
- passed on August 08, 2024 at 14:06
- Characterization
-
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Width: 657
File Format: tiff (Tagged Image File Format)
File Size: 1208378
Filename: 8287_img_129.tiff
Last Modified: 2024-08-09T03:47:50.695Z
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Mime Type: image/tiff
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| Transcript |
- to fall back on insects etc. [etcetera] Some indeed
bring so little food to the [female symbol] that she leaves the
nest to hunt + the eggs chill.
2. The amount of food available directly
governs the numbers of young raised. In this
species it is the last hatchling that perishes.
3. The birds have definite hunting territories
of about 50 acres. This was determined by
marking as many of the small mammals as possible
+ getting the marks back from the pellets.
4. The range of exodus of young is very small
+ the normal fate of the young is to perish.
Only enough surviving to keep the habitat full
5. He is not sure yet how the predator effects
the prey but it looks as if a point of
diminishing returns exists that is about the
same from year to year. Major hazards are
snow - but this is rare.
Discussed with [Charles] Elton the question of cycles.
He still half toys with the idea of an overall
control, + favors "weather patterns" but
cannot explain the mode of operation
[David] Lack on the other hand is convinced that
food is the ultimate control in all fluctuations.
Had lunch with David [Lambert] Lack + with Dr. [space left blank]
professor of entomology here + later spent
most of the afternoon with [David Lambert] Lack. With
him I had a long discussion of the correspondence
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