Ecology Exam

Front 1

scotch broom (invasive species) direct effect

Back 1

intense competition with native species, leading to local extinction of the natives in the areas infested with broom

Front 2

scotch broom (invasive species) indirect effect

Back 2

symbiotic nitrogen fixing by this legume increases soil nitrogen, an effect that remains even after scotch broom has been removed

Front 3

dangers of high nitrogen in the soil

Back 3

high nitrogen soil allows secondary invasion by other weedy species, particularly rhizomatous grasses, which will now compete heavily with the native prairie species

Front 4

lowering nitrogen levels in soil

Back 4

add carbon! carbon increases microbial populations by adding carbon sources so that the bacteria sequester available soil nitrogen

Front 5

deliberate invasive species introduction

Back 5

non-native species introduced for agriculture, horticulture, and aesthetics

Front 6

inadvertent introduction of invasive species

Back 6

introduction of non-native species accidentally by agricultural and commercial products and our movements (transportation etc...)