Populations and the Environment (EOC)

Describe animal interactions that affect populations in the tundra ecosystem.

Animals have adapted to the harsh weather conditions and long winters of the tundra. Animals migrate to eat insects that live there year round. Many animals in the tundra hibernate during the long, cold winter months. Animals are most active in the short summer as the snow melts and shallow wetlands form.

Many organisms depend on the land as a food source. Seasons can affect the amount of food that is available to these organisms. How would a long, cold winter most likely affect a population of deer? The deer population will decrease. The deer population will increase. The deer population will remain almost the same. The deer population will rebound the next year.

The deer population will decrease.

A recent forest fire has swept through the forest, killing many of the smaller organisms such as the hare, deer, and rodent populations that are prey for the larger organisms such as bobcats, wolves, and mountain lions. How would this affect the populations in the forest ecosystem? Check all that apply. The populations of all organisms in the forest will stay the same. The populations of bobcats, wolves, and mountain lions will decrease due to lack of food. The populations of deer, hare, and rodents will decrease due to the number of predators. The population of bobcats, wolves, and mountain lions will increase due to the availability of food.

The populations of bobcats, wolves, and mountain lions will decrease due to lack of food. The populations of deer, hare, and rodents will decrease due to the number of predators.

A change in habitat results in what?

a change in niche

negative interactions with the environment =

a decrease in the population growth

negative example of a natural disaster

a flood may result in the decrease of small mammal populations

population

a group of organisms of the same species that live in an area

Check the items that are living. a horse a rock a mushroom a rotting log bacteria

a horse a mushroom bacteria

The Phoenix area of the Southwestern desert typically receives 8 inches of precipitation yearly, in two seasonal patterns. Even though it is an arid region, it has high biological diversity. Thin-leaf trees abound, such as palo verde and desert ironwoods. Wide varieties of cactus thrive, including the cholla, prickly pear, and saguaro. Wildlife includes insects, reptiles, many bird species, small rodents, and other mammals. Which factor in the Southwestern desert ecosystem is abiotic? a prickly pear seed a fallen palo verde leaf a rainstorm a wolf spider

a rainstorm

Is fire Biotic or Abiotic?

abiotic

Is sunlight abiotic or biotic?

abiotic

is rock biotic or abiotic?

abiotic

positive interactions with the environment =

an increase in the population growth

adaptation

an inherited or learned trait that increases an organism's chance of survival in its environment

predator-prey relationship

an interaction between two species that controls the population size of both species

habitat

an organism's physical environment

Why is a shell considered to be biotic? because it is found in the biosphere because it was alive because it came from something living because it is not living

because it came from something living

Is shell biotic or abiotic?

biotic

is bear biotic or abiotic?

biotic

is dead log biotic or abiotic?

biotic

is grass biotic or abiotic?

biotic

what are the two environmental factors?

biotic and abiotic

negative, positive, or both: A dam is built in the middle of a river ecosystem to supply water to a nearby town-

both

negative, positive, or both: Humans remove wolves from a national park to protect surrounding homes-

both

Elephants shape their environment in many ways. They can change a forest to a grassy field or dig a hole that might become a pond. They clear large amounts of vegetation, which removes habitats for some organisms but makes the area inviting for other organisms. Which best describes possible interactions of elephants with the surrounding ecosystem? positive negative neither positive nor negative both positive and negative

both positive and negative

how do populations affect their environment and other populations?

changing the size of other populations, changing the landscape, changes water availability

interactions with abiotic factors

climate water landscape

examples of positive interactions:

favorable climate increase in food source increase in nest sites or shelter decrease in predators

Describe the niche of the giraffe.

graze foliage maintain open woodland oxpecker parasite mutualistic relationship

Identify the characteristics of life. Check all that apply. has one cell or more use energy are capable of locomotion reproduce contain bones and muscles respond to the environment grow and develop breathe in oxygen

has one cell or more use energy reproduce respond to the environment grow and develop

positive example of human activity

humans can protect elephants and help increase their numbers through conservation efforts

Inference

logical interpretation made from an observation

Which describes the habitat of a frog? color for camouflage prey for snakes eats insects marshes and ponds

marshes and ponds

interactions with biotic factors

members of their own population other population

negative, positive, or both: A mudslide wipes out the side of a thriving hill-

negative

negative, positive, or both: A volcano erupts, covering the nearby land with lava-

negative

Which best describes a bird's role as it eats seeds? parasite predator habitat niche

niche

A rock is classified as nonliving and abiotic nonliving and biotic living and abiotic living and biotic

nonliving and abiotic

biotic

of or relating to an environmental factor that is living or that came from something that was once living

abiotic

of or relating to an environmental factor that is not living and has never lived

negative example of human activity

oil spills can lead to a decrease in the populations of fish and seabirds

Biotic factors in a forest ecosystem:

plants, animals, bacteria, fungi, dead and decaying organisms.

negative, positive, or both: A forest is rapidly growing new plant life-

positive

Which relationship is shown in the graph? competitive exclusion relationship habitat-niche relationship biotic-abiotic relationship predator-prey relationship

predator-prey relationship

Observation

recognizing and noting with your senses

Abiotic factors in a forest ecosystem:

rocks, dirt, water, fire, climate

which is a biotic factor? rotting carcass rock drop of water fire

rotting carcass

Describe the habitat of the giraffe.

savanna bush scrub woodland acacia

positive example of a natural disaster

some plant seeds will not sprout until they have been subjected to fire; in this way, forest fires can increase a plant population

ecosystem

the biotic and abiotic factors in a particular area

how does habitat determine an organisms niche?

the organisms adaptations to its habitat help determine its niche

Which describes a grizzly bear's habitat? all the biotic factors in the ecosystem all the abiotic factors in the ecosystem the role of the bear in the ecosystem the physical area where the bear lives

the physical area where the bear lives

niche

the role an organism plays in the environment in which it lives

what does it mean when interactions become cyclical?

they change over time

What does the competitive exclusion principle state?

two species cannot occupy the same niche in the same habitat.

examples of negative interactions:

unfavorable climate decrease in food source increase in predators natural disaster human activity

A log is no longer a biotic factor but once came from a living thing (a tree). Can it still be considered biotic?

yes