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memorize.ai (lvl 286)

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Section 1

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Describe the Gause Experiments

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Competition Prep

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6 years ago

Date created

Mar 1, 2020

Cards (15)

Section 1

(15 cards)

Describe the Gause Experiments

Front

3 diff spp grown alone, each have logistic growth When placed in same container that ate same food, 1 spp prevented the other from using same resource, local extinction When spp that didn't eat same food, they both grew together

Back

What are the ways that isoclines can be arranged to each other

Front

Isoclines do not cross= competitive exclusion, way middle arrow (grey) points determine which spp will win Some point inwards, grey points away from each other, competitive exclusion, but uncertain winner All point inwards= coexistance, both grey point inwards

Back

What is the competitive exclusion principle?

Front

2 spp using a limiting resource, 1 will become locally extinct

Back

What can dictate competition?

Front

Amount of niche overlap

Back

What is character displacement?

Front

Competition causes phenotype of competing spp to evolve to become different overtime, aiding resource partitioning, differences in beak size Can also lead to new spp

Back

What is a niche? What is fundamental and realized niche?

Front

The functional role of a spp, all factors that spp needs to grow and reproduce Fundamental niche= Niche that allows spp to reach max potential Realized= Presence of other spp restict niche, usually smaller than realized

Back

What are the 2 outcomes when spp compete?

Front

One spp outcompetes the other or they can coexist

Back

Can competition lead to extinction?

Front

Yes

Back

What is the Lotka-Volterra model

Front

dN1/dt=r1N1(K1-N1-alphaN2/K1) alpha/beta= competition coefficient which indicated how dtrong competition effect is dN2/dt=r2N2(K2-N2-betaN2/K2) Can be used to predict end result of competition Abundance doesn't change when N=K N2=K1/alpha

Back

How can 2 spp coexist by using the same limiting resource?

Front

Reduce competition by using different resources, can be done by living in different areas

Back

Is competition static?

Front

No, it can be altered by the environment, disturbance, and predation Environment can cause competitive reversal which is when the inferior spp become superior

Back

Describe Interspecific competition

Front

Between diff spp All spp are affected badly by sharing a resource Resource must be in short supply for competition to occur

Back

What will the growth rate if: Pop growth rate on isocline line Pop between origin and isocline Pop above isocline

Front

0 Positive Negative

Back

What is the difference between interference and exploitative competition?

Front

Interference= Direct competition, fighting Exploitative= Indirect competition, eating food so another can't

Back

What is coexistance?

Front

When intraspecific comp is greater than interspecific comp

Back