Biog 2: Species + Distribution + Niche (10), species distributions

"...I was much struck how entirely vague and arbitrary is the distinction between species and varieties"

In a room of 'n' biologists, there will be n+1 definitions

"... the species is as important a unit of biology as is the cell at a lower level of integration."

• groups of actually or potentially interbreeding natural populations
• reproductively isolated from other such groups
• Produce viable offspring

their offspring (mules) can't reproduce

abt Ligers: "It's pretty much my favorite animal. It's like a lion and a tiger mixed... bred for its skills in magic."

• Male lion (1st part of word)
• Female tiger (2nd part of word)

*** Groups of actually or potentially interbreeding, natural populations, which are reproductively isolated from other such groups

• Have viable offspring BUT live in different places (reproductively isolated)
• Lions- grassland cooperative hunters
• Tigers- woodland individual hunters

Only reproduced when coerced by humans

• area where a species can be found (expected to be found)
• mapped with red dots for organisms and their space/range with a blue line around them

Ecological Niche and continue to interact through interbreeding

• Main Range
• Discontinuous Range (Isolated populations)
• Extirpated populations

species dies out in a specific area, but still exists elsewhere

individual adult animals moving around

all organisms of the same species who live in the same geographical area

all organisms of the same species who live in the same geographical area

# of individuals within a unit area

• 230 grizzly bears/1500 sq. miles
• 0.15 bears per sq. mile
• (each grizzly needs 6.7 sq. miles of its own)