notes on lecture 39 from ecology lectures in Biology 1a at the university of Glasgow
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Course
Biology 1A (BIOL1001)
Institution
University Of Glasgow
just some notes I took in the lecture. they may not be perfect and may not include everything that you need to know on the topic, but maybe they can help someone
population:
= a group of individuals of the same species that are interbreeding freely
same species
same habitat
use same resources
individuals interact
1. populations are members of the same species
2. populations are defined by physical boundaries
3. populations use the same resources
food
water
breeding sites
roosting sites
over-wintering habitat
4. individuals in populations interact
breeding
competition for resources
intraspecific competition = competition for resources between members of the same
population/species
lecture 39 — ecology of populations 1
, interspecific competition = competition for resources between members of different
populations/species
three important population concepts:
1. populations have structure
2. populations expand and contract
3. populations are regulated
1. population structure
age structure and mortality
number of indivdiuals declines as age increases
three types of survivorship curves
type 2: straight line, diagonal from young to old. constant gradient— mortality
rate is the same (same probability of dying) throughout
type 1: curved— gradient becomes steeper with age. survivorship for young is
very high, mortality rate for old is very high
type 3: curved— gradient becomes more shallow with age. mortality rate is very
high for young, then decreases over time
variation in mortality pattern— can be predicted from life-history strategy and
environment
type 1:
mortality is highest in older age classes
found in long lives species
living in a stable environment
iteroparous (reproduction spread throughout lifetime)
type 3:
high mortality in juveniles
lecture 39 — ecology of populations 2
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