Why do birds migrate from north to south?

What is the difference between longitudinal and latitudinal migration?

Longitudinal: Similar to latitudinal migration, this type of movement is a change between different longitudes from east to west or west to east. This is a common type of migration for many birds in Europe, where geographic features encourage birds to move longitudinally rather than latitudinally.

What is the difference between latitudinal and longitudinal migration?

Latitudinal birds migrate from north to south or south to north, such as from Canada and the US to Mexico or South America. Typically birds will only migrate from south to north to seek out more breeding opportunities because most birds travel north to south to seek out warmer weather. Longitudinal birds migrate from east to west or west to east.

What direction do birds migrate?

In North America, birds typically migrate from north to south following coastline and rivers such as the Mississippi. In Europe and Asia, migrations more often follow an east-west orientation following the Himalayas, Alpes, and the Mediterranean Sea. Many birds migrate to Africa in fall and fly over 1000 miles over the Saharan Desert.

What will happen to the population when the growth rate approaches zero?

The growth rate will approach zero. The population will show an Allee effect. The population will increase exponentially. The carrying capacity of the environment will increase. The growth rate will not change. The growth rate will approach zero. has become so large that it will have difficulty surviving and reproducing.

Why is the population growth curve of a disturbed forest logged?

Logged, because the disturbed forest affords more resources for increased specific populations to grow. Which of the following graphs illustrates the population growth curve of single bacterium growing in a flask of ideal medium at optimum temperature over a 24-hour period?

How do the members of a population often belong to different species?

The members of a population often belong to different species. A uniform distribution of individuals within a population occurs if each individual’s position is independent of others’ positions. The most common spatial distribution among individuals within a population is clumped.

Why does the population stop increasing at point 3?

The population stops increasing because it has reached the carrying capacity of the ecosystem in which it lives. The ecosystem cannot support any more flies than this number. b. It has the greatest impact on the population at point 3. This is because population density is greatest at point 3.

What are the limiting factors of human population growth?

No population of organisms can grow uncontrollably, even humans. All populations have what are called limiting factors. Limiting factors are anything that places restrictions on how large a population can grow. What do you think can restrict human population growth? Could it be the cost of food? What about the cost of obtaining energy?

What happens when there is zero population growth?

When zero population is reached, the number of organisms that die in a time frame is equal to the amount of organisms that are born in that same time frame. Negative population growth means that there are more individuals leaving the population than joining the population.

What does Zero Population growth mean for deer?

Johnson says that means zero population growth. Each round stands for one year of the representative deer population. In those years where the graph is flat, the population had zero growth, and its numbers stayed the same. Mr. Johnson asks if the class thinks zero population growth is beneficial to the deer.

Why are dwarf mistletoes logged in disturbed forests?

C) logged, because the disturbed forest affords more resources for increased specific populations to grow D) logged, because the various populations are stimulated to a higher reproductive potential B Dwarf mistletoes are flowering plants that grow on certain forest trees. They obtain nutrients and water from the vascular tissues of the trees.

How do individuals belong to the same species?

According to the biological species concept, individuals belong to the same species if they can interbreed in nature and produce viable, fertile offspring. Prezygotic and postzygotic barriers ensure that members of different species do not reproduce with one another.

How do scientists infer the evolutionary history of a species?

From this evidence, scientists infer that the particular species evolved from a common ancestor population that moved into different environments, where the populations were changed through natural selection.

How many species does each population belong to?

The researchers discovered that the 12 populations could be organized into 3 distinct species. Populations A, B, and C each belong to a different species. Use the data in the grid to sort each population to the species to which it belongs.

Are species distributions at their equilibriums?

Introduction Ecologists often assume that species distributions are at their equilibriums ([1]but see [2]) and treat species’ geographical ranges as though they are static features [3]. However, changing environmental conditions can profoundly affect many aspects of species’ geographic ranges and thus lead to dynamic distribution patterns [4]–[5].

What does a population that is not undergoing natural selection display?

A population that is not undergoing natural selection displays what type of distribution? In a poplution of birds, intermediate beak size is selected against, and both very small and very large beak sizes are favored. What type of selection is this an example of genetic drift.

What is a limiting factor in ecology?

An environmental factor such as predation, disease, and competition that depends on the number of members in a population per unit Q. What does a limiting factor do? Q. In a forest ecosystem, which of the following is the best example of a limiting factor for a rabbit population?

What is an environmental factor that depends on number of members?

An environmental factor such as predation, disease, and competition that depends on the number of members in a population per unit Q. What does a limiting factor do? Q. In a forest ecosystem, which of the following is the best example of a limiting factor for a rabbit population? Q. Which of the following is TRUE of predator/prey relationships?

What is the starting population of a deer?

Deer: Predation or Starvation Key Student Handout: Starting population was 2000 Change is population is deer born minus deer deaths, can be a positive or negative number. This number is added to the deer population number to get the number for the following year.

What is meant by Zero Population growth?

Zero population growth occurs when a population has the same number of individuals entering the population (births) as those leaving the population (deaths). This results in very little change in the overall population numbers.

What year did the deer population decrease the least?

In 1979 , the change was + 20 , though it was n’t exactly ZPG is was the year where the lowest amount of change occurred in the deer numbers . 5. Most biology textbooks describe that predators and prey exist in a balance.

How do limiting factors affect a population’s size?

Such limiting factors would not be expected to have a greater impact on the population at any particular population size. Give an example of an organism with a Type III survivorship curve, and explain the advantage a high reproductive rate might give an organism with this type of survivorship curve.

How does population growth affect the world?

PIP: In many parts of the world high population levels and growth rates are responsible for hunger, disease, and poverty. Humans are not the only species suffering the consequences of the increasing numbers of people.

Why does the population of flies stop increasing?

The population stops increasing because it has reached the carrying capacity of the ecosystem in which it lives. The ecosystem cannot support any more flies than this number. b. It has the greatest impact on the population at point 3.

What is the average lifespan of an old growth forest?

There is no single definition for old-growth forests, because that depends on the ecosystem. Bristlecone pines can live 5,000 years. Some other tree species may only live 150 years, but if they are in forests largely undisturbed by humans, researchers may still consider them old-growth.