2the study of the interactions of organisms w/ its environment. What is Ecology?“Ecology”the study of the interactions of organisms w/ its environment.
3Population GrowthPopulations grow when birth rate exceeds rate of mortalityDEATH
4Horizontal axis = Number of individuals Age DistributionAge-Structure Diagram shows growth patterns of populations grouped into categoriesHorizontal axis = Number of individuals
5Human Age Distribution Developed countriesLess-developed countries
6Humans are part of the Earth's ecosystem. Human activities can either deliberately orinadvertentlyalter the balanceof an ecosystem.
7How do human activities affect the environment? What do you Think???How do human activities affect the environment?
8Will you change your perspective or will you feel the same way? With more info…Will you change your perspective or will you feel the same way?
9Human impacts on the Environment Global warmingUse of machinery by humans seems to be increasing CO2 levels in the air. CO2 prevents heat from escaping, causes slight world wide temperature increasesRising water temperatures causes coral bleaching
10Human impacts on the environment DeforestationCaused by demand for wood products,need for space, farmland, housing,roadsDeforestation causesHabitat fragmentationAnimals and plants are forced into confined areas
13Human impacts on the Environment Ozone depletionCaused by aerosol chemicals calledchlorofluorocarbons (CFCs)CFC’sEscape into atmosphere, reacts breaking down the ozone (O3, a protective atmospheric layer)UV rays penetrate the atmosphere and cause harm to many organism.
15Human impacts on the Environment Fishing activitiesDemand for fish and shellfishCommercial Fishing be harmful to environment in many ways
16Human impacts on the environment Invasive species (EXOTIC SPECIES)introduced by people accidentally or intentionallyCan cause problems if no natural enemies are presentCane toad was introduced to Australia to control cane beetles, pest insects that destroy sugar cane crops
17Human impacts on the Environment Exotic pet tradeCapture and sell wild animals fromexotic locationsWealthy buyers and collectors desireobscure animalsAnimals removed from their habitatcauses an imbalance in the ecosystem