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Chapter 1

BIO120H1 Chapter Notes - Chapter 1: Reaction Rate, Vapor Pressure, Hadley Cell

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Ingrid L.Stefanovic

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BIO Chapter 1:
ecology, greek meaning house, study oh how organism interact in an
Environmental supports systems: things on which humanity relies for fod,
water and protection against natural catastrophes.
Some examples of these are: watersheds, agriculture lands, and wetlands.
An ecological system may be an organism, a population, or assemblage of
populations together, an ecosystem or the biosphere.
Each smaller system is a subset (part) of the next larger one.
Most fundamental part of ecology: organism
Ultimately, all environments are linked together in a single biosphere [known
as the ultimate ecological system]
Population: many organisms of the same kind living together
Populations differ from organism because populations are potentially
immortal; births replace deaths
They also have roper ties such as geographic ranges, densities, and variations
in size or composition(evolutionary responses).
Community: populations of different kind make up an ecological community.
Communities have no visible boundries
Organism approach: the way in which an individuals form, physiology, and
behaviour help it to survive in its environment.
This explains why organisms are limited to certain environments
For instance, moist areas are home to trees, where as hot and dry areas are
home to shrubs with small leaves.
This helps one understand adaptations: modifications of structures or
function to better suit an organism increase survival + fitness
Population Approach: variations in the number of individuals, sex ratio, age,
genetic makeup
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