Question

1) In an experiment, insect-eating birds were removed from a plot of forest. As a result, herbivorous insect populations grew, and trees were observed to grow more slowly. This is an example of _____________ that demonstrates ________.

2) Lichens are a symbiotic association of ascomycete fungi and photosynthetic protists or cyanobacteria. The fungal partner gets nutrition by breaking down rocks, creating new soil. These are an example of ______________ that can initiate ____________ on a newly emerged volcanic island.

Answer 1

1) In an experiment, insect-eating birds were removed from a plot of forest. As a result, herbivorous insect populations grew, and trees were observed to grow more slowly. This is an example of Competition interaction that domenstrates that limited supply of at least one resource used by both can be a factor.

2) Lichens are a symbiotic association of ascomycete fungi and photosynthetic protists or cyanobacteria. The fungal partner gets nutrition by breaking down rocks, creating new soil. These are an example of mutalism interaction that can initate on rocks of newly emerged volcanic island.