Populations:
What influences a population in the rainforest? How do we know it's healthy?
Key terms:
Carrying Capacity, Community, Competition, Density dependent, Density independent, K-Strategist, J-curve, Limiting factors, population, r-strategist, S-Curve, plateau phase, dominant species, ecological resistance, habitat, intra-specific, inter-specific, survivorship, disturbance, pioneer species, sigmoid curve, equilibrium, predation, transitional phase, lag phase, species, fundamental niche, realized niche
Carrying Capacity, Community, Competition, Density dependent, Density independent, K-Strategist, J-curve, Limiting factors, population, r-strategist, S-Curve, plateau phase, dominant species, ecological resistance, habitat, intra-specific, inter-specific, survivorship, disturbance, pioneer species, sigmoid curve, equilibrium, predation, transitional phase, lag phase, species, fundamental niche, realized niche
Environmental Factors that limit a population
Task 1: Define the following terms:
Task 2: Annotate the picture here
Use the correct labels below to show the different factors that increase or decrease environmental resistance. Image Sources:
1.https://cdn.thinglink.me/api/image/964173217981792259/1240/10/scaletowidth 2.Pearsons & Longman
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Abiotic measures of a biome |
niche.pdf | |
File Size: | 121 kb |
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Population Curves & Types of species
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How does environmental resistance and biotic potential change a population size?
r-organisms (reproductive)
short-lived small size Many offspring early reproductive maturity fast maturation little parental care for offspring low ability to learn |
K-organisms (carrying capacity)
long-lived large size few offspring later reproductive maturity slow maturation much parental care for offspring high ability to learn |
Task 3: Note down the differences shown here for K and r strategists. Now the teacher will give you a list of species. Compete to be the first person/team to identify what it is and justify your answer for points.
Task 4: Answer the following question. Do all animals fall into a type 1 or 3 category? Why/Why not? Justify your answer. |
How do populations interact?
Task 5: Biotic interactions skit: Make a 30 sec. skit to demonstrate one of the relationships shown below.
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Task: 7 The following situations illustrate various ecological relationships. Identify which relationship (commensalisms, mutualism, parasitism, or predation) is described in each situation.
- A mite (an eight-legged organism similar to a spider) lives in the base of the eyelashes of people who use mascara. It feeds on the mascara; it does not seem to harm people.
- A coyote captures, kills, and eats a rabbit.
- A tapeworm lives in the intestines of a dog. It absorbs food the dog has eaten and grows larger in the process. The dog become weaker from malnutrition.
- Birds eat insects that the hooves and muzzles of grazing cows disturb.
- The flower of the yucca plant provides the only location where the yucca moth can lay her eggs. In the process, the moth pollinates the yucca flower.
- Cleaner shrimp living in the ocean eat ectoparasites (parasites on the outer surface of the animal) off fish.
- Bacteria that live on the surface of our teeth require sugar from our food to survive. A by-product of their metabolism (body processes) decays the enamel of teeth.
- A 3-point buck is killed by a hunter.
- Bacteria in the intestines of cows produce vitamin C, enabling cows to skip orange juice at breakfast.
- Bass found in warm water lakes of Colorado eat gizzard shad, a small fish grown and raised by the Colorado Division of Wildlife.
- Nitrogen-fixing bacteria live in the roots of some plants. They provide nitrogen in a form the plants need and obtain a “home” and nourishment from the plants.
- Nematodes (a round worm) live in plants and gain nourishment from the plant but do not seem to harm it.
- E. coli bacteria live in massive quantities in the large intestine of humans. They produce Vitamin K. It is not known if this is absorbed into the human’s system or not. If it is, it aids in blood clotting.
- Aspen trees provide shade for small spruce and fir trees. These would not grow as well in direct sunlight.
- Bighorn sheep take in worm eggs when grazing. The worm egg hatches in the intestine and the larvae migrate to muscle tissue. When the larvae mature, they bore into capillaries and float to the lungs, where they form cysts. Large numbers of these can affect the breathing of the bighorn sheep.
- Insects lay their eggs in the buds of spruce trees. The insect larvae live off the plant material and prevent the bud from developing normally.
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