Directed reading - macarthur paper Flashcards
five species of warbler
cape may, black throated green, blackburnian, myrtle, bay breasted
definition of congeneric
species belonging to the same genus
how can coexistence occur?
each species, when abundant, should inhibit its own growth more than it inhibits the other
heterogeneous
diverse
main factors studied
food, proper feeding zones, shelter from weather, nesting sites
how did the feeding zones vary?
with height and position on branch
cape may feeding position
high T zone
Myrtle feeding position
low B zone
black throated green feeding position
middle T an M zones
blackburnian feeding position
middle to high T and M zones
bay breasted feeding position
Middle B M and T zones
3 directions of movement
vertical, radial, tangential
cape may movement
vertical
BTG and myrtle movement
tangential
bay breasted and blackburnian movement
radial
Hawking
moving prey is sought in the air
hovering
a nearly stationary prey is sought amid the foliage
plasticity definition
the adaptability of an organism to changes in its environment
species with most varied feeding habits
myrtle
3 reasons why 2 species may eat different food:
1 - they may feed in different places or different times of day
2 - they may feed in such a manner as to find different foods
3 - they may accept different kinds of food from among those to which they are exposed
Darwin’s statement on clutch size
A large number of eggs is of some importance to those species which depend on a fluctuating amount of food, for it allows them to rapidly increase in numbers
species that capitalise upon spruce budworm outbreaks
cape may, bay breasted - have larger clutch sizes in budworm years (bay breasted)
most common evidence of mortality
parents feeding only one or two newly fledged young
salomonsen statement
species which breed in the same place tend to winter in different geographic regions - doesn’t occur in the 5 warblers
