Biodiversity Flashcards Preview

Biology > Biodiversity > Flashcards

Flashcards in Biodiversity Deck (17):

What is genetic diversity?

Estimate of gene variants (alleles) in a species


What are the two components of species diversity?

Species richness and species evenness


What is species richness?

Number of species in an area


What is species evenness?

Number of individuals of each species


What is habitat/ecosystem biodiversity?

Number of habitats (ecosystems) within an area - hardest measure of biodiversity to calculate as boundaries of habitats are difficult to determine with accuracy


What is a population?

A group of organisms of the same species


The genetic diversity of a population could increase due to...

DNA mutations, gene flow between populations of the same species


The genetic diversity of a population could decrease due to...

Selective breeding, captive breeding, genetic bottlenecks (population size reduced due to disease, habitat destruction, migration)


How can genetic diversity be calculated?

No of alleles per gene
Heterozygosity - proportion of individuals in population with 2 alleles for a particular gene
Proportion of polymorphoc genes


What are 3 human activities that can impact biodiversity?

Forestry management (and deforestation), agriculture, fossil fuel combustion


How can agriculture impact biodiversity directly and indirectly?

Deforestation, hedgerow removal, monoculture, killing organisms considered pests or weeds, eutrophication, draining of rivers and lakes for irrigation schemes


How does fossil fuel consumption indirectly impact biodiversity

Acid rain production, climate change leading to habitat destruction


What are the principal outcomes of the Rio Convention?

Sustainability targets
Targets to reduce desertification/ increase land fertility
Targets for greenhouse gas emissions


What are advantages of seed banks over botanical gardens?

Smaller so easier to store and transport
Less space required to store/ more can be stored in same amount of space
Longer term storage (remain viable for centuries)
Less risk of disease or damage


What are the advantages of in situ conservation methods?

Cheaper (usually)
Enables interspecies relationships to be maintained
Avoids potential problems when reintroducing species


What are the advantages of ex situ conservation methods?

Provides optimum conditions and veterinary care (medical attention)
Enables controlled breeding programmes


What is conservation? As opposed to preservation?

The active and sustainable management of an ecosystem. Preservation maintains an ecosystem, leaving it undisturbed