Alfred Russel Wallace - Who was collecting specimens in the Malay Archipelago, had independently conceived of natural selection.

TLS Online TPP Program

#Id: 5493

#Unit 10. Ecological Principles

If survival of juveniles and adult is poor - Selection favors a single act of reproduction

TLS Online TPP Program

#Id: 5494

#Unit 10. Ecological Principles

If survival of juveniles is very poor and unpredictable but adult are more likely to survive - Selection favors repeated reproduction and long reproductive life.

TLS Online TPP Program

#Id: 5495

#Unit 10. Ecological Principles

Under favorable circumstances, the same per unit biomass of annuals produces more seeds than the same per unit biomass of trees. 

TLS Online TPP Program

#Id: 5496

#Unit 10. Ecological Principles

k-selected species

Stable populations adapted to exist at or near the carrying capacity, K

Grow slowly and reach reproductive age late, having to devote much energy to growth and maintenance

K-selected species like a tree grows large and outcompeting  other  species

Such trees have a long-life span and produce seeds repeatedly when mature

These seeds are bigger

Nonrandom matting

TLS Online TPP Program

#Id: 5497

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 5498

#Unit 10. Ecological Principles