environmental science 3.4/3.5

Organisms that have a large effect on the abundance and type of organisms in an ecosystem

• nonnative species

• invasive species

• keystone species

• indicator species

The variety of genes, species, ecosystems and ecosystem processes

• biodiversity

• species evenness

• species richness

• ecology

Species that are nonnative and harmful to an ecosystem

• nonnative species

• invasive species

• keystone species

• indicator species

How does habitat fragmentation reduce genetic diversity in species?

• Habitat fragmentation makes nonnative species introduction possible.

• Habitat fragmentation opens migration routes.

• Habitat fragmentation isolates a large population into smaller groups.

• Habitat fragementation encourages open gene flow.

the breaking of habitats into smaller pieces is called...

• habitat division

• habitat pollution

• habitat corruption

• habitat fragmentation

What is causing many animals, such as the box turtle's habitat to be fragmented?

• houses

• streams

• powerlines

• roads

Besides the risk of vehicular collisions, how else do roads harm wildlife?

• by limiting ability to find mates

• by limiting ability to find food

• by dividing wildlife populations

• all of these answers are correct

Habitat fragmentation is caused by ........ factors

• natural

• anthropic

• natural and anthropic

habitat loss is ....... while habitat fragmentation is ........

• degradation - breaking apart

• destruction - breaking apart

• breaking apart - destruction

• degradation - subdivision

The effects of habitat loss on biodiversity are ....

• always positive

• always negative

• positive or negative, it depends on