Summary
Summary notes of Chapter 11 - biodiversity
A concise and clear overview of the key concepts covered in chapter 11. These notes make biology easy to understand and are a good place to start your revision and boost your grades.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
Follow
Content preview
BIODIVERSITYCHAPTER 11
Importance of biodiversity Measuring biodiversity
- all species are interconnected - Tropical moist regions have most biodiversity
- In reduced biodiversity, connections - Closer to equator = greater biodiversity
are not present and eventually harms - Measuring is important in conservation and to determine
all species in the ecosystem effects of changes
- EIA is taken before any buildings (environmental impact
assessment)
Habitat biodiversity - 3 levels at which biodiversity can be studied at:
- The number of different habitats - Habitat
found within an area - Species
- In general, the greater the habitat - Genetic
diversity, the greater the species
diversity
- Eg, meadow, streams, sand dunes, Sampling
woodland, hedgerows - “Taking measurements of a limited number of individual
organisms present in a particular area”
- Can be used to estimate overall no of organisms ie
Species biodiversity abundance
- 2 parts: - Also used to measure a characteristic
- Species richness: no of different - 2 ways: random and non random
species - RANDOM:
- Species evenness: comparison of - Selecting individuals by chance
the numbers of individuals of each - Each individual has equal chance of being picked
species in a community - 1. Mark out grid using tape measures
- 2. Use random numbers to determine coordinates
Genetic biodiversity - 3. Take sample at each coordinate
- Refers to the variety of genes that - NON RANDOM:
make up a species - Opportunistic, stratified, systematic
- Alleles - Conveniently available, split into strata and randomly pick
- Greater genetic diversity = greater from each one, line or belt transect
adaptations
Sampling techniques (animals) Reliability
- must be released at the point they were collected - a sample is never
- Pooter - small insects entirely
- Sweep nets - insects in grass representative due
- Pitfall traps - crawling insects to:
- Tree beating - Sampling bias: can
- Kick sampling - river be reduced by
using random
sampling
- Chance: can never
be completely
removed but is
minimised by using
a large sample
size
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 georgiawelch38. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £4.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53068 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now