# BIOL242-Diversity of Life Exam 1 study

To determine the role of a native starfish species in a coastal ecosystem, zoologist Robert Paine removed starfish from some intertidal pools and not others. He then observed how the community changed in response to the loss of starfish by comparing the diversity of the community in the pools where starfish had been removed to the diversity in pools where he had let the starfish remain.
By removing starfish from some pools, what global change driver was Robert Paine investigating?
Click the card to flip 👆
1 / 62
Terms in this set (62)
To determine the role of a native starfish species in a coastal ecosystem, zoologist Robert Paine removed starfish from some intertidal pools and not others. He then observed how the community changed in response to the loss of starfish by comparing the diversity of the community in the pools where starfish had been removed to the diversity in pools where he had let the starfish remain.
By removing starfish from some pools, what global change driver was Robert Paine investigating?
When crop fields are not being used in the current growing season, farmers plant cover crops instead, like vetch, rye and clover, to prevent erosion of the topsoil. Cover crops grow quickly, and their roots provide a scaffolding to hold most of the soil in place, even in heavy rain. In this way, cover crops maintain the amount of soil in an area and limit the amount of nutrients that runoff from fields into neighboring waterways. What type of ecosystem service are these cover crops providing?
To prevent pests from eating his crops, a farmer applies a synthetic insecticide to his fields. A synthetic insecticide is a chemical made by humans that kills insects. It rains the next day, and some of this insecticide ends up in a stream near the fields. Some stream insects that aren't agricultural pests are killed. What kind of pollution has occurred in the stream?
A bird eats sunflower seeds from a bird feeder on a snowy day. Of the 1000 J of energy that was in the consumed seeds, the bird stored 10 J of energy in its body, eliminated 150 J of energy in its waste, and used the remaining energy to respire. What is the production efficiency of this bird?
Useful equation: PE = Pn/An x 100
A researcher was studying two barnacle species (Cthalamus stellatus and Semibalanus balanoides) living on rocks along the coast of Scotland (shown below). The researcher removed all the Semibalanus barnacles from a section of rocks, and then recorded changes in the distribution of Cthalamus barnacles. After the removal of Semibalanus, Chthalamus barnacles spread into the region formerly occupied by Semibalanus.
What is a valid conclusion of this experiment?