Population growth & Pest control. - created from Mind Map

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 Population Fluctuations Food Availability Parasitism Predators Disease Weather Competition Acculmination of toxic waste Factors affecting population size Density Dependent Factors Density Independent Factors Food Parasitism Accumination of toxic waste Disease Floods Fire Frost Regulated by balance between PR and DR Fluctuations are small

Competition Plants compete for... Animals compete for Intraspecific Competition Interspecific competition Water Space Nutrients Sunlight Space Reproductive Partner Shelter Food Competition for resources between members of the same species It's also the best driving force behind natural selection Competition for resources i.e SUNLIGHT, WATER, SPACE, FOOD. Generally one out competes the other It's between members of different species

Pest Control A pest is an organism which competes/ adversely affects a population or organisms What pests do? Chemical Control Biological Control That are of economic importance Feed on crops and animals Compete with crop organisms for resources Directly cause disease in crop organisms Spoil food when being transported/stored It involves the use of How can it be applied What is a pesticide? Advantages Disadvantages Herbicides Fungicides Insecticides Spray Powder Smoked Animal food Poisonous chemical weed to control organisms Considered harmful to agriculture Or to an organism involved in disease transmission 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 Some pests could harm fish or birds Long term exposure is harmful to humans Pests become resistant to pesticide Eradication can cause resurgence Contamination of food Beneficial organisms are deployed against undesirable pest Advantages Disadvantages 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 No environmental contamination Usually highly specific to one pest used in glass house situations Provide long term control if population eqilibrium is reached 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

Population growth & Pest control.