Transcript Intro to ECOLOGY - Solon City Schools

What do the wolves in this
picture represent?
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Population
Ecosystem
Community
Biome
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Which of the following could
be the wolves COMMUNITY?
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All the populations
of wolves in that
biome
The wolves, and
the moose
The wolves and the
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Everything in this picture
would add up to a/an…
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Population
Biome
Ecosystem
Species
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The Atmosphere, Water and Soil
pictured below are examples of…
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Biotic Factors
Abiotic Factors
Ecosystem
Population
Community
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The rabbit and wolf below
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Intro to ECOLOGY
(Chapter 33)
33.1

The study of the interaction of organisms with
each other and their physical environment
Organisms are organized into:
Populations – ex: Perch


ONE species!
(Members of a species living in an area)
Communities –ex: Perch, Walleye, Algae


(All the populations in an area)
Ecosystems –ex: Fish, Algae, Rocks, water



More than ONE
species!
(A community and its physical environment)
includes biotic and abiotic factors
Adds NONliving
components!
Biomes –ex:Tundra, Rainforest


(A large group of similar ecosystems containing distinct
types of plants, animals, etc…determined by climate)
Biosphere


(all the communities on Earth whose members exist in air,
water, and on land)
How do populations grow?
BIOTIC POTENTIAL: highest possible per
capita rate of increase for a population

Per capita rate of increase= (Births-Deaths) / # of
individual

LIMITING FACTORS: (create environmental resistance)

Biotic-living parts of the ecosystem


vegetation, etc
Abiotic – nonliving parts of the ecosystem




Precipitation
Temperature
Inorganic nutrients
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Exponential Growth…J curves
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Has two phases:
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Lag phase: growth is slow
because the population is
small
Exponential Growth Phase:
growth is accelerating,
and the population is
exhibiting BIOTIC
POTENTIAL.
Cannot usually continue
for long because of …
Environmental Resistance &
Carrying Capacity

Environmental Resistance: all the environmental
conditions that prevent populations from reaching their
biotic potential
 Ex: limited food supply, accumulation of waste,
predation, competition…(biotic and abiotic limiting
factors)
MOST populations taper off around their…

Carrying Capacity: # of individuals the environment can
normally support
We call this kind of growth…
Logistic Growth

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This creates an “S
shaped curve”
Four phases:
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1. Where is the carrying capactiy in
this curve?
Lag
Exponential growth
Deceleration phase (pop
growth slows)
Stable equilibrium
phase/stationary phase
(births and deaths start
to even out)
Discussion Topics…
…Survivorship Curves p. 683
…Human Population Growth
developed vs. less developed countries
…Age distributions