Summary
Summary - Module6 chapter24 Population + sustainability
- Course
- Institution
Population + sustainability notes perfect for revision.
[Show more]
Seller
Follow
ariel3
Content preview
Ch24 Populations and Sustainability(a) Factors that determine population size
A population is all the organisms of one species in a habitat
For example, all the foxes in a wood form a population. All the people in a town form a population
Population size is the total number of organism of one species in a habitat. This number changes over time as a
result of the effect of various factors
Typical growth of a population
1
, 1) Slow growth phase –
individuals are reproducing but as
there are only small numbers,
growth happens slowly
2) Rapid growth phase – as
the number of breeding individuals
increases, the total population
multiplies exponentially
3) Stable state – further
population growth is prevented by
limiting factors. During this time the
population size fluctuates but overall
its size is stable. Birth rates and death
rates are approximately equal.
Fluctuations are accounted for by
fluctuations in limiting factors
The stable state usually occurs when the environment reaches its carrying capacity. This is the maximum population
size that an environment can support
Limiting factors
Limiting factors prevent further growth of a population and in some cases cause it to decline
Abiotic: temperature, light, pH, availability of water or oxygen, humidity
Biotic: predators, disease, competition
(b) Interactions between populations
Competition
Competition is an example of a biotic limiting factor
Competition can either be:
• Interspecific competition
2
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 or Stuvia-credit 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 ariel3. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.47. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
58426 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now