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Slide 1

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Populations and sustainability
By Daniella Di-Fonzo…read more

Slide 2

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· (a) explain the significance of limiting factors in determining the
final size of a population;
· (b) explain the meaning of the term carrying capacity;
· (c) describe predator­prey relationships and their possible effects
on the population sizes of both the predator and the prey;
· (d) explain, with examples, the terms interspecific and
intraspecific competition;
· (e) distinguish between the terms conservation and preservation
(HSW6a, 6b);
· (f) explain how the management of an ecosystem can provide
resources in a sustainable way, with reference to timber
production in a temperate country;
· (g) explain that conservation is a dynamic process involving
management and reclamation;
· (h) discuss the economic, social and ethical reasons for
conservation of biological resources (HSW6b, 7c);
· (i) outline, with examples, the effects of human activities on the
animal and plant populations in the Galapagos Islands (HSW6b).…read more

Slide 3

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explain the significance of limiting factors in
determining the final size of a population
· Limiting factors stop the population size of a
species increasing
· Limiting factors can be biotic or abiotic
Abiotic conditions Biotic conditions
Temperature- needs to be optimum for Interspecific competition- competition
metabolic reactions to occur between species
Amount of light Intraspecific competition- competition
within a species
Amount of water available predation
Amount of food available
Chemical composition of surroundings…read more

Slide 4

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Carrying capacity: The maximum population size
that can be sustained within an are
Conservation: the management of the
environment to maintain and, where possible,
increase biodiversity; it is an active, dynamic
Preservation: the protection of an ecosystem to
keep it as it is.…read more

Slide 5

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predator­prey relationships
· As prey population increases, there's
more food so the predator population
grows as their young is more likely to
survive to breed.
· As predator numbers increase, more
prey is eaten so the prey population
· This means there's less food for
predators so their numbers decrease
again and this continually happens
· For this type of relationship, the
predator must be specialised to one
prey and predation must be the main
limiting factor on the prey population…read more

Slide 6

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explain, with examples, the terms
interspecific and intraspecific competition
· Interspecific- competition between species for
the same resources. i.e. food, water, shelter.
E.g., grey squirrels and red squirrels
· Resources available to both species are
reduced and therefore, their populations are
smaller than if there was just one species
· It can affect the distribution of species as the
better adapted one will out compete the
other one so it cant coexist with a better
adapted species…read more

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