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Lecture

lecture note


Department
Biology
Course Code
BIO120H1
Professor
Ingrid L.Stefanovic

Page:
of 3
L10- BIO 120
S3- animals disperse when their reproductive value is at peak.
S4- vanilla seeds: tiny seeds (like dust), coconut- biggest seeds, differ in 7th
order magnitude from vanilla seeds. Vanilla seeds are dispersed by wind.
Wind dispersal can also disperse larger seeds.
S6- a seed is going to have the highest success b its size, the larger the seed,
the more maternal material enough resourcesgreatest success in
survival. Tiny seeds dont have the same resources, so must land in places
good for sporutong.
S8- berries, attractive to animals to eat seed dispersal
Birds smaller intestines only need to break down simple fuit sugars, and
brightly coloured.
Apples- best interest to NOT eat seeds. Apple seeds covered by cyanide (bad-
tasting so we dont eat it).
Birds and bats are great dispersers -> fly and take seeds along the way
Elaiosome(what ants eat) on seeds, then the seed is just disposed by
ants.
Glacier lily (enthronium grandiflorum) concentrated in one type of
habitat, where there is a lot of superficial rock. Flowers like the rocky
places.
its a perennial, produces a corm (resource storage organ) makes
large fruits and seeds. Seeds are quite big so how far can they
disperse? Used fluorescent powders and fabric to figure out how far
seeds gothey did not go far at al (about 28cm max) weak dispersal.
No elaiosome in these species (other species of enthronium do) . Ants
not interested.
Plants subjected to combinations of soil. Result: BURIED, ORGANIC
SOIL survived, every other soil, seeds died. Only combo that worked.
Iterparous, long-lived, grows as a vegetative plant before flowering
Seeds subject to desiccation (dehydraion)
UNLESS in moist conditions.
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Need quantitative data
S24-S30 experiment conducted, details on slides.
S31-
negative relationship between flowering plants and seedlings
displaced.
Physical factors: rockiness and moisture inversely related.
Gophers avoid rock slows their tunneling down
S33- most seeds being life in rocky reas, desiccate and die. The few seeds that
reach moist areas and likely to live and reproduce, but then in moist deep-soil
area, thy have a chance of being killed by gohers before they reach flowering
age.
rock-refuge hypothesis
to be persistent, have a lambda of ne, plants only have to reproduce
once, have one other offspring.
S34- elements from previous lectures that explain this too: see slideshow.
Why no elaiosome
S36- large landscape is driven by pocket gophers.
S37- aspen grow better in deep-soil areas only if protected by gophers. See
slide.
S38- pocket gohers are keystone species, have indirect effect (hurt lilles
directly, but help them maintain meadows.)
S39- see slide.
S40- grizzly bears dig up glacier lily meadows .
S 41- the corm is longer in Colorado than in Montana
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