Biotic Factors: All Living Factors in an ecosystem
Polar bears, ducks, seals, penguins,
wolves, foxes, fish
Trees, grass, bearberries, flowers, shrubs,
Abiotic: All nonliving factors in an ecosystem
the largest amount of individuals of one species an environment can support. What a habitat needs is water, food, space and shelter to support a species.
Polar bears need water, food, space and shelter to survive. If there are too many polar bears, then there won't be enough of those resources that every polar bears needs and that would result in a decline of the polar bear population. There are only so many seals, so much space and so much water. Their habitat can only support a certain number of polar bears, once the population has exceeding that number, polar bears start to die.
Examples: Food, Water, Sunlight, Predator/prey relationships, snow storms, global warming, weather changes
Any factor or condition that limits the growth of a population.
Limiting Factors example:
Polar bears eat seals. Let's say that the arctic had a very harsh winter and the polar bears couldn't find a place to hunt because the area of ice and snow was so large. The polar bears can't find a place to hunt for seals and they will eventually go hungry. The seal population would increase because they wouldn't have a whole lot of polar bears eating them. The polar bear population would decrease because they wouldn't be able to find food and water to give them the nutrients they need to reproduce. The polar bears also wouldn't be able to find water to drink either.
Now let's go the opposite direction and say that the arctic had a warm winter instead. The polar bears would be able to find an area to hunt for seals and drink water. The polar bear population would go up as the seal population would plum it. But there is also a downside to this as well, that would also limit the space for the polar bears to find shelter. Sometimes there is a perfect balance to even out the two species but the world doesn't work that way unfortunately. Sometimes there will be more prey than predators and then it will be the opposite in a few years.
Graph Showing their Relationship:
They are determined by how the organism gains energy and how it reacts with other living things in its ecosystem.
There are three main energy roles:
Consumer: herbivores, carnivores, omnivore and scavenger
They get their energy from the sun
Aquatic arctic moss
Flowers: pasque flower, bearberry flower
They get there energy from the producers.
Herbivores: Caribou, musk ox, arctic hare
Carnivores: Wolves, arctic fox, seals
Omnivores: Polar bears, Arctic ground squirrel, arctic fox
Scavengers: Arctic ground squirrel, arctic fox
They get their energy from the consumers.
Why are producers so important to the ecosystem?
The producers convert the radiation energy from the sun into energy that all consumers and decomposers need to live. If we didm"t have producers then we couldn't get the energy that we need to live.
Why are Food Webs More Realistic?
Food webs are more realistic than food chains because food webs show tat animals eat mrs that one thing. For example, a bear eats fish and berries . A food web would show that and a food chain wouldn't. In the real world, we as humans eat more than just beef, we eat carrots, pork and chicken as well. It's the same thing with animals, they eat more than one plant or animal.
Arctic Food Web:
If I removed the snowy owl from the food web, then other species would be affected. The arctic hare would increase in population, and then there would be less arctic willow, purple saxifrage and grass and sedge. The arctic wolf population would also decrease because one of it's prey isn't there to it to eat. u
Why Are Producers The Largest Level?
Why a Pyramid?
The producer level is the largest level because they have the most amount energy.
The pyramid shows the amount of energy in each level unlike other shapes.
What is Needed for Photosynthesis?
As you can see in the picture above, a plant needs Carbon dioxide(CO2), water(H2O), sunlight. Though you can't see it in this image, the plant also needs oxygen as the chemical change happens. Photosynthesis also produces 2 things: oxygen and glucose(also known as sugar).
Radiant energy is transformed into chemical energy.
is the turning or bending movement of an organism toward or away from an external stimulus, like light, heat or gravity.
Positive stimulus: movement toward stimulus
Negative Stimulus: movement away from stimulus
Positive: Roots grow towards the center of the Earth; where gravity pulls them
Negative: Trunk and branches grow towards the sky; away from where gravity is pulling them
Negative: The roots of plants grow away from ice or water that is very cold, because the don't want to get frozen and then the plant won"t be able to grow.
How Does Tropisms Help?
Tropisms help the plant move towards the resources(sunlight, water,ext.) that the plant needs and away from the things that aren't needed or wanted(being touched, excess water, ext.).
Why are they so important?
Decomposers break down the dead and unneeded carcesses of animals and plants. They also put nutrients back into the soil that producers use to grow. The producers also give the consumers the nutrients as well. If there weren't any decomposers then we would all kinds of dead and unwanted carcesses lying around, and nobody likes that!
Adaptations are very important because our world is always changing. Animals and plants adapt to our ever changing world to survive. Penguins don't use their wings anymore to fly, they use them to swim. Their fur and feet have adapted to help them swim better than to walk and fly because they don't have a strong need for that since their food is in the water. Penguins need to swim to get food. Polar bears have also aquired thick layers of blubber to survive the icy waters and land.
Leaves fall off of trees before the snow and bitter cold air come so that they don't freeze off. Grass and shrubs also become dormant to be protected from the cold. Animals will need to have extra blubber or fur or feathers to keep themselves warm. Animals will need to be able to live in very cold temperatures.
What would happen if polar bears went to live in the desert?
Polar bears would basically die, but they are many factors to how and why they would die. Polar bears would burn up in the hot desert with all the fur that they have. They also couldn't find anything to eat since they eat seals and other fish and seals and other fish don't live in the desert. Polar bears are animals that can't go for long periods of time without water, so they would get dehydrated very easily.
The process where animals that are better adapted to their environment tend to survive more and reproduce more.
Penguins that have more white feathers are more likely to survive because they camouflage better with the ice patches in the sea. The penguins are preyed on by the leopard seal. When the leopard seal population increased, the penguins with more white feathers survived longer to reproduce than the ones without. Therefor, the penguins with more white feathers reproduced more penguins with white feathers than the ones that were dying off.