ECOSYSTEMS. An ECOSYSTEM is made of all the living & nonliving things that interact in a particular area Ecosystems can be large or small. FACTORS THAT AFFECT THE GROWTH OF A POPULATION.
An ECOSYSTEM is made of all the living & nonliving things that interact in a particular area
Ecosystems can be
large or small
When conditions are good, a population will generally increase. But a population does not keep growing forever. Eventually some factor in its environment causes the population to stop growing.
FOOD & WATER
-When food is scarce, the
population numbers will decrease from
starvation or low birth numbers.
-When food if plentiful, numbers increase because
of low death rates and high birth rates.
-If the plant or animal does not have enough room to reproduce and grow, the numbers will decrease.
-When space is
plentiful, the pop-
ulation will increase.
-Conditions such as drought and temperature changes can limit the population growth.
-Too cold, too hot, too wet, too dry all affect population growth. Early frost can kill many insects and plants.
conditions such as
rainfall etc, can
Predation has a huge effect on the size and growth of a population.
-If there are more predators or they are more efficient at hunting techniques, then the prey species goes down.
Predators directly affect the population of their prey and the prey directly affect the population of the predator.
How is this possible?
What is the carrying capacity of this ecosystem for the rabbits? Fox?
Name the carrying capacity of this environment for the wolves and the moose.
Remember, when the prey species goes up, the predator goes up SHORTLY THEREAFTER.
When the prey species goes down, the predators go down, SHORTLY THEREAFTER.
-When two or more individuals or populations try to use the same resources. Can occur within populations or between populations
-When disease (fungal, parasitic, bacterial, viral) is introduced to a population, population numbers are affected. Only the strongest individuals overcome the disease and survive.-
1. Helped 2. Unaffected 3. Harmed
Zebra & oxpecker
Lichens: algae + fungus
Barnacles on whale
Shark & remora
The evolution of two species totally dependent on
each other. Coevolution is an extreme example of
Yucca moths and yucca plants
Acacias are small, trees that have large, hollow thorns. The acacia ants live in the thorns. On the tips of its leaflets, the plant makes a substance used by the ants as food. The ants defend the tree from herbivores by attacking/stinging any animal that even accidentally brushes up against the plant. The ants also prune off seedlings of any other plants that sprout under “their” tree
Acacia ants and acacia trees
The pollinator gets a reward such as nectar for pollinating the plant. Insects (beetles) on the plant found this protein/sugar mix and used it as food.
Insects became dependent on this food source and started carrying pollen from plant to plant.
Beetle-pollination must have been more efficient than wind for some species, so there was natural selection for plants that attracted insects.
Coevolution is often seen in a number of species of flowering plants that coevolved
with specific pollinators (insects, bats, etc).
1. Got the number wrong makes it a 1 or 2.
2. If they just listed – food, water, disease, climate, intro new species, disaster, space.
If they just listed with no discussion or only listed one or incorrect. 1 or a 2.
If they did not explain why - 2