Lecture 10 Flashcards
1
Q
Characteristics of r-selected species
A
- High reproductive rates
- Fast growth rates
- Many offspring in a short period
- Low parental care – all relative
- Mature quickly
- Short lifespan
2
Q
What characteristics are r-selected species associated with?
A
- Unpredictable or unstable environments
- Abundant resources and low competition
- Disturbed and new habitats – newly mowed lawns
- High dispersal and rapid colonization of habitats
3
Q
Characteristics of k-selected species
A
- Low reproductive rates
- Efficient resource utilization
- High competitive ability
- Slow growth rates
- Fewer offspring
- High parental investment
4
Q
What characteristics are associated with k-selected species?
A
- Stable and predictable environments
- Mature and crowded ecosystems
- Resource limited environments with intense competition
- Maintaining a stable population size near the carrying capacity (K) of their habitat.
5
Q
Intrinsic growth rate (r or lambda)
A
refers to the maximum rate at which a population can grow under ideal conditions.
6
Q
Exponential growth rate equation
A
Nt = No e^rt
7
Q
Geometric growth rate equation
A
Nt = No lambda^t
8
Q
What is Nt?
A
Population size at time t
9
Q
What is No
A
Initial population size at time t
10
Q
What is t
A
Number of time intervals
11
Q
Exponential vs geometric growth
A
- Both show rapid growth due to multiplication
- Both involve intrinsic rate of increase
HOWEVER, - Geometric = discrete
- Exponential = continuous
- Different interpretation of intrinsic growth rates
