Biological control Introduced/Indicator Species Topic 6 + 7 Biological control Introduced/Indicator Species

POS Environmental monitoring/management Endangered species Extinction

Biological Control A way of controlling pests, using their natural enemies, rather than chemical pesticides

Introduced species (Exotic) Often harm the ecosystem, by upsetting the natural balance (invasive) Ex. Lack of natural predators Brought in: Accidentally Seeds, organisms on boats/airplanes This is why customs regulations are tight Intentionally as a biological control As food source

Africanized killer honey bees They are “tougher” than normal honeybees, taking over hives and reproducing May take only 1 sting to be lethal

Zebra Mussels Great Lakes They reduce the amount of food (algae) for other species

Cats, rabbits and foxes in Australia Severely reduced small mammal populations

Bed bugs “don’t let the bed bugs bite” Hard to get rid of Increased international travel

Weeds-purple loosestrife

Dandelions

Ox eye Daisy

Indicator Species Organisms that are sensitive to environmental change, that will die if the area is not healthy Ex. Amphibians (frogs, toads, salamanders) Problems: Acid rain, loss of habitat, pesticides, introduced species

Amphibians

Ecosystem Monitoring Scientists examine the environment Physically mountains, lakes, cities, deforestation Environmentally climate, temperature, weather Chemically air, soil, water quality Biologically population and species of organisms

Assignment T6-7 Review Q’s Make a bar graph (computer) pg 71 Pg 67#4, pg 78#1,2,4, pg 79 #4,10,11 Make a bar graph (computer) pg 71 Read “Unit at a Glance pg 84” Copy into your journal Unit Review Q’s

Biological control…Introduced species Review DDT as chemical control Harming non-target organisms Discuss the impact of a biological control Ex. Introduction of birds to eat mosquitos

Changes in Ecosystems Extinction Endangered Threatened Extirpation (Statistics)

Project Endangered species assignment