BIO205 Lecture 17
- Lecture 17: community dynamics
- Back to tadpoles and predators
o Different predators go after tadpoles
- What happens when we keep swimming past the reef?
- Communities can be organismic (Clements)
o Looking at an environment gradient
o Clear separations of communities
- Communities can be individualistic (Gleason)
o Each species are adapted to a range of environmental conditions of its own
o No clear separation between communities, there is a gradual change
- Imagine walking up a mountain slope, which concept is more realistic?
- Burdock community differs between locations
o Burdock grows everywhere, the insect communities changes as it goes from south to
o More individualistic pattern
- Grasslands are different
o Fire is crucial in maintaining the grassland communities
o Larger plants don’t survive those fires
- But maybe it’s not species that count
- Can we blame the foxes?
o YES OR NO? No. Foxes don’t really eat grass
o The puffins feed on fish to feed chicks; the puffins were reduced because of the foxes
o Foxes reduce puffin populations limited the amount of nutrients that the grass gets