Biology Ecology 2 complete latest update 2024 solution
Population density the number of individuals that live in a defined area.
different, same Populations of different species often have very __________ densities, even in the ___________ environment.
geographic range ...
Population density the number of individuals that live in a defined area.
different, samePopulations of different species often have very __________ densities, even in the
___________ environment.
geographic range the area inhabited by a population
size, species A population's range can vary enormously in ______, depending on the
____________.
Distribution/dispersion how individuals in a population are spaced out across the range of
the population
randomly, uniformly, or mostly concentrated in clumps Three types of distribution
Population dispersion how a population is spread in an area.
demographic transition a dramatic change from high birthrates and death rates to low
birthrates and death rates.
three The demographic transition is divided into ___________ stages
Stage I birthrates and death rates are high for most of history.
Stage II advances in nutrition, sanitation, and medicine lead to lower death rates.
Birth Rates remain high for a time, so births greatly exceed deaths and the population increases
exponentially.
Stage III as the level of education and living standards rise, families have fewer children
and the birthrate falls; population growth slows.
, demographic transition, meets, stops The ____________ is complete when the birthrate
__________ the death rate, and population growth ________.
down, logistic The rate of growth of human population is going _________, and our J shaped
curve might turn into a ________ growth curve.
age structure the number of males and females of each age a population contains
equal, slow In the United States, there are nearly _______ numbers of people in each age
group.
This age structure predicts a _______ but steady growth rate for the near future.
(diagram looks like a steady U shape)
young children, double In Guatemala, on the other hand, there are many more _______
than teenagers, and many more teenagers than adults.
This age structure predicts a population that will ________ in about 30 years.
(Diagram looks like sharp V-shaped)
Immigration, births, emigration, deaths Four factor that determined changes in a
population's size
always changing The size of a population is ____________________
Immigration Moving in
Emigration moving out
available resources Population growth is based on ______________________
Exponential growth a rapid population increase due to an abundance of resources.
exponential growth, larger, faster, larger In ___________________, the ________ a
population gets, the _______ it grows. The size of each generation of offspring will be ______
than the generation before it.
Logistic growth due to a population facing limited resources.
occurs when a population's growth slows and then stops, following a period of exponential
growth.
Carrying capacity the maximum number of individuals in a population that the environment
can support.
population crash a dramatic decline in the size of a population over a short period of time.
Ecological succession a series of more-or-less predictable changes that occur in a community
over time.
regenerates or creates a community after a disturbance.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller docguru. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £7.70. You're not tied to anything after your purchase.
