Friday, October 24, 2014

Summative summary questions

1. using an example describe why a population could not increase for ever.

Because the ecosystem has a carrying capacity that limits how many of a species can live in that area or then overpopulation will happen and the animals that surpass that will die.


2. what are factors that determine whether a population increases or decreases
(use each factor in one-sentence example)

The hawk population is low because they hunted all the rabbits and they got low in numbers so all the hawks cannot feed themselves in turn the population decreasing, so the rabbit population has time to grow more since it is not being hunted as much since less hawks are there.
The hawk population has gotten bigger in numbers and there are lots of rabbits since before that the hawk population has been small so they start hunting a lot of rabbits in turn of that the rabbit population is decreasing since there has been a sudden increase of hawk population.

3. Give a reason why the human population of earth has continued to increase so much for the past 100 years?

Because the human population has not reached the carrying capacity that the whole world has of humans and we have been getting resources excessively like cutting down too much trees for homes, making lots of electronic devices, mining all the minerals and oil that will eventually run out. Until one point where the earth can no longer support us then there will be a sudden decrease of humans because we have surpassed the carrying capacity of the world on us.

Thursday, October 23, 2014

Population dynamics

Details

One change in a population can affect a whole
ecosystem.

Example

If the rabbit population catch a diseases and the predator eat the infected rabbits they will catch the diseases get sick and die so will the rabbits and that will be a domino effect on the whole ecosystem

  Details

Carrying capacity is the maximum population an ecosystem can support

Example

The carrying capacity of snow leopards is 35 in the snowy mountains


 Details

If a predator population increases prey population decreases

Example

The hawk population increases and the mice decreases since its being hunted by priority since they are so many mice from overpopulation when the hawk population was low and couldn't eat so many mice.


Details

If a prey population increases  the predator population increases

Example

If the gazelle population increases because it rained more than average so they ate more grass in turn the could feed more gazelle so they increased the population since the ecosystem could support more for the time being the predator being the lions have more gazelle to hunt so they can feed more lions in turn rising in population of lions.



Tuesday, October 21, 2014

Simbiosis

Mutalisim - Both benefit

Humans - Dogs

Dogs get food and a shelter and being treated properly
Humans get love from a pet and get to play with them and gets a good mood.

Bee - Flower

The bee gets nectar to make honey.
The flower gets pollen dropped by the bee for reproduction.

Commensalism - One benefits and a other does not but at the same time is not harmed in any way

Frog - Tree

The frog gets shelter from the tree when it rains.

Sharks - Ramore

Ramore stick on to the shark getting free fast transportation food scraps and protection without the shark knowing.

Parasitism - One benefits and the other gets harmed

Bug - Human

The bug takes blood from the human for energy
The human needs blood to survive and might get diseases such as malaria.

Friday, October 3, 2014

Discussion Questions

1. Why do we as scientist build food webs:
We build food webs to know what animals are that are in a ecosystem is since if you add or remove one animal it will change in a way that can positively and negativity affect it. When we saw the Yellowstone video it showed how if you just change the food web by one animal it will affect the whole entirety of the ecosystem so they added wolfs. The wolfs ate the overpopulated deer so the vegetation grew more since the deer avoided areas and that positively the whole park, that shows that if you add or remove an animal in a ecosystem it could change everything.

2. Give an example of how one change might affect many other parts of an ecosystem:
If mice where removed from a ecosystem the snakes in the area don't have as much food and other prey of snakes will become more hunted since the mice where removed and that prey is hunted by a other animal and they prey becomes extinct since it being hunted too much and that will be a domino
effect that will collapse a ecosystem or will change it greatly.

3.Give an example of how one change in La Quebrada might affect the rest of the ecosystem:
If you start deforesting the trees in La Quebrada birds wont have a place to build nests so they will have to leave or be over crowding trees and with the trees removed they might start building apartments witch will horribly affect all the animals since the noise is too much and they are hurting the ecosystem by removing all the trees and other animal homes like the fishes if the creek gets in their way so the fish wont have a home and if the fish have a predator the predator will be hungry and will leave so the other prey of the predator will become overpopulated and they wont be able to feed themselves so they die of hunger. This is an example of how one change would affect the whole ecosystem.