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Population growth & Pest control.
Descripción
A Levels Biology Mapa Mental sobre Population growth & Pest control., creado por paige-monaghan el 03/02/2014.
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biology
biology
a levels
Mapa Mental por
paige-monaghan
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paige-monaghan
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Resumen del Recurso
Population growth & Pest control.
Why do they live in a population?
-Greater Chance of meeting
Work together to bring up the young
Protection from Predators
If disease, better adapted to changing environmet
What is a population growth?
A group of ORGANISMS of a single species interbreeding and occupying a particular area
Growth Phase
Environmental Resistance
It is all the factors which may limit the growth of a population
Food Availability
Parasitism
Predators
Disease
Weather
Competition
Acculmination of toxic waste
Factors affecting population size
Density Dependent Factors
Food
Parasitism
Accumination of toxic waste
Disease
Density Independent Factors
Floods
Fire
Frost
Population Fluctuations
Regulated by balance between PR and DR
Fluctuations are small
Competition
Plants compete for...
Water
Space
Nutrients
Sunlight
Animals compete for
Space
Reproductive Partner
Shelter
Food
Intraspecific Competition
Competition for resources between members of the same species
It's also the best driving force behind natural selection
Interspecific competition
Competition for resources i.e SUNLIGHT, WATER, SPACE, FOOD.
It's between members of different species
Generally one out competes the other
Pest Control
A pest is an organism which competes/ adversely affects a population or organisms
That are of economic importance
What pests do?
Feed on crops and animals
Compete with crop organisms for resources
Directly cause disease in crop organisms
Spoil food when being transported/stored
Chemical Control
It involves the use of
Herbicides
Fungicides
Insecticides
How can it be applied
Spray
Powder
Smoked
Animal food
What is a pesticide?
Poisonous chemical weed to control organisms
Considered harmful to agriculture
Or to an organism involved in disease transmission
Advantages
Doesn't require high level of skill
very effective masses of control
Pests eradicated quickly and cheaply
Chemicals can be applied on a small scale
Disadvantages
Some pests could harm fish or birds
Contamination of food
Long term exposure is harmful to humans
Pests become resistant to pesticide
Eradication can cause resurgence
Biological Control
Beneficial organisms are deployed against undesirable pest
Pests act as food source for introduced organism
Reduction in numbers of pest as eaten, keep numbers below economical damage threshold
Pests not eradicated completely as there would be no food source
Advantages
No environmental contamination
Usually highly specific to one pest
used in glass house situations
Provide long term control if population eqilibrium is reached
Disadvantages
very few successful examples
biological control agents slow to build up in numbers
High level of skill and research involved for success
Detailed knowledge of life cycle of pesticide is required
Carbon Cycle
Nitrogen Cycle
How can humans improve the circulation of nitrogen
Fixing atmospheric nitrogen artificially using chemical processes that convert to fertilisers
Micro organisms can be used for making compost and silage
Sewage disposal boosts organic nitrogen supplies
Large amounts of animal waste from stock rearing used as manure
Recursos multimedia adjuntos
06-14_BacteriaGrowth_1 (image/jpg)
Image34.gif (image/gif)
Image33.gif (image/gif)
carbonCycle2.gif (image/gif)
NitrogenCycle (image/jpg)
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