ABG51806 wildlife conservation genetics summary of both the literature and lecture notes
Samenvatting boek A primer of conservation genetics
All for this textbook (4)
Written for
Wageningen University (WUR)
Dierwetenschappen
ABG-51806 Wildlife Conservation Genetics
All documents for this subject (1)
2
reviews
By: mauraterpstra • 6 year ago
By: lizzy19defeijter • 6 year ago
Translated by Google
Written very clearly! Contains all important elements from the book
Seller
Follow
marlinterhuurne
Reviews received
Content preview
Samenvatting ABG51806 – Book: A Primer of Conservation Genetics
Chapter 1 Introduction
Endangered species decline due to: habitat loss, overexploitation, introduced species and
pollution. At small population sizes additional random factors (demographic, environmental,
genetic and catastrophic) increase their risk of extinction.
Biodiversity: variety of ecosystems, species, populations within species, and genetic diversity
among and within these populations. The biological diversity of the planet is rapidly depleting
as direct/indirect effect of human activities.
When extinctions are balanced by the origin of new species (speciation), biodiversity is
maintained.
Four justifications for maintaining biodiversity are:
Economic value of bio resources: all our food, drugs, natural fiber, rubber, timber etc.
Ecosystem services: essential biological functions benefiting humankind, provided
free of charge by living organisms. For example: oxygen production by plants, climate
control by forests, nutrient cycling, and water purification.
Aesthetic value: pleasure from living organisms. For example: keeping pets, growing
ornamental plants, visiting zoos etc.
The rights of living organisms to exist (ethical): our species does not have the right to
drive others to extinction.
The majority of recorded extinctions and a substantial proportion of currently threatened
species are on islands.
Threatened: high risk of extinction within a short time frame.
- Critically endangered
- Endangered
- Vulnerable
- Lower risk
Criteria:
A. Actual or projected reduction in population size
B. Extent of occurrence or area of occupancy of
C. Population numbering and an estimated continuing decline, or population severely
fragmented
D. Population estimated to number
E. Quantitative analysis showing the probability of extinction in the wild.
Projections indicate greatly elevated extinction rates in the near future.
Listing of a species or sub-species as endangered provides a scientific foundation for
national and international legal protection and may lead to remedial actions for recovery.
Causes of extinctions
Human-associated factors
The primary factors contributing to current extinctions are habitat loss, introduced species,
over-exploitation and pollution. These are all generated by humans, and related to human
population growth.
Stochastic factors
Additional accidental environmental catastrophic, demographic and genetic factors increase
the risk of extinction in small populations.
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 marlinterhuurne. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $4.27. You're not tied to anything after your purchase.