BIO 20 UNIT BSection 4.1 Interactions within Ecosystems
TO START THINGS OFF...
Let’s see what we know...show me your skills Complete questions on pg 82 #3(a,b), 4, 5
Ernst Haeckel (German Biologist) First used the word “ecology” in 1866 Derived from the Greek words “oikos” (meaning
a place where one lives) and “logos” (study of) Ecology- the study of interactions between
organisms and their living and non-living organisms
Living = biotic factors Non-living = abiotic factors
QUICK WORK
Air Aluminum Apple seeds Bread Clock Clouds Corpse Cotton fabric Finger nails Fish
Glass Gold Grapes Hair Paper Pipe Plant Plastic Pork chops rain
Salad Sand Snail Steak Water Shale Wooden ruler wool
Working with your neighbor, create a Biotic vs. Abiotic Table. Place the following objects in the appropriate position in the Table.
ECOTONES AND BIODIVERSITY
EcotonesA transition area between ecosystemsContain species from both bordering
ecosystems Often has an increase in biodiversity compared to
other ecosystemsA predator may have alternative prey if
something happens to the population of its main prey
By providing alternative food sources ecotones help guard against extinction
ARTIFICIAL VS. NATURAL ECOSYSTEM
Artificial ecosystem Planned or maintained by humans
Natural ecosystem Lakes, rivers, forests, deserts, meadows, etc The living community is free to interact with the
physical and chemical environments
ROLES IN ECOSYSTEMS
Every organism has it’s “place” in an ecosystem Ecological Niche – an organism’s role in an
ecosystem, consisting of its place in the food web, its habitat, its breeding area, and the time of day at which it is most active
Species that live in the same area occupy a different niche so that they can live with less competition Figure 6 – pg 90 Reading: Examples on pg 90
What will have a greater biodiversity: a natural forest or a planted forest? Why?
EXOTIC SPECIES
Exotic species are species that are not native to an ecosystem Leads to competition Can happen naturally or artificially
Plant seeds spread by the wind, animals transport themselves
Humans move species through discovery of new land, hulls of ships, etc.
Reading: pg 91
DANGERS OF EXOTIC SPECIES
Can cause species depletion, extinction, or habitat loss
Problem: ecosystem lacks predators and disease for exotic species which allows the species population to grow uncontrollably
Native species are unable to compete for space, food, or reproduction sites and may also fall prey to the exotic species
Invasive Species
ASSIGNMENT
Complete Case Study – The Zebra Mussel individually.
WARNING:Do NOT plagiarize. Complete this assignment using
your own words and not ones from the article or from your friends. This assignment is to be done on your own.
ASSIGNMENT
Complete questions on pg 93 #1, 2, 3, 4, 5, 7
