Lecture 2- Measuring Biodiversity Flashcards
Define alpha diversity
Species richness
Define beta diversity
The difference in species composition between places
Define phylogenetic diversity
Measure of levels of species relation. The greater the phylogenetic diversity, the less related the species.
Which global regions exhibit the greatest phylogenetic diversity?
Islands due to the prescience of endemic species
What three measures are “high” in biodiversity hotspots?
- Richness
- Endemism
- Threatened species
Which geographical regions are prioritise for conservation?
Biodiversity hotspots
What percentage of biodiversity hotspots contain high levels of: richness, endemism and threatened species?
ONLY 2.5%
Define functional diversity
The range of services provided by organism within a community. The greater the variation in services, the greater the functional diversity.
What does functional diversity influence?
Ecosystem function
How are phylogenetic and functional diversity linked to eco system function?
Functional diversity is directly proportional to eco system function. functional diversity is directly proportional to phylogenetic diversity, as its though that closely related species perform similar function.s therefore, the greater the phylogenetic diversity, the greater the functional diversity and overall ecosystem function.
Explain the complementary approach to diversity
The complementary approach focuses of conserving the maximum amount of diversity in the provided, limited geographical area.
How is phylogenetic diversity measured?
Via the branch length of phylogenetic trees
Why is biodiversity important?
It provides tools for selecting regions of conservation
Why do we need to prioritise regions for conservation?
Limited space for wildlife and limited resources to put into conservation efforts.
what percentage of biodiversity hotspots are classed as being idiosyncratic?
80%
