lesson 15 Flashcards
id: the region of the earth’s surface
where all living things live and interact with one another
bioshere
id: all of the species in one region or ecosystem
biodiversity
how many species of plants and animals are there in existence? how many are identified?
around 8.7 million
around 1.2 million species have been identified and described so far
Biodiversity varies in terms of geographical location, which is said to be high in the 9poles, tropics) but decline to (poles, tropics) due to amount of sunlight.
tropics; poles
enum: (3) kinds of biodiversity that are essential to preserve ecological
systems and functions
1) genetic diversity: a measure of the variety of different versions of the same
genes within individual species
2) species diversity: the number of different species within individual communities or
ecosystem.
3) ecological diversity: the number and
variability of ecosystems in an area
including the number of niches, trophic levels, and ecological processes that
capture energy, sustain webs, and recycle materials within this ecosystem
enum: (2) ways of measuring biodiversity
species richness
species evenness
id: the number of species in a
particular place
species richness
id: the extent to which individuals are distributed evenly among species
species evenness
ToF: Biodiversity is evenly distributed
false
enum: (4) benefits from biodiversity
food
medicines and drugs
ecological benefits
aesthetic and cultural benefits
id: the reduction of habitat into smaller and smaller scattered patches
habitat fragmentation
enum: (8) threats to biodiversity
- Habitat loss and fragmentation
- Over – exploitation for commercialization
- Invasive species
- Pollution
- Global climate change
- Population growth and over consumption
- Illegal wild life trade
- Species extinction
IUCN
International Union for Conservation of Nature
