In Pennsylvania, a nonnative plant called stilt-grass out-competes native plants in many forest ecosystems. Which statement best describes how the spread of stilt-grass negatively affects native herbivores?

In Assigned Article #3 (Martin et al. 2015), the authors found that herbivory decreased lifetime seed production almost 3 times more in the plants that had not been historically browsed by deer than the plants that had been historically browsed by deer.Group of answer choicesTrueFalse

What is an example of a disturbance?Group of answer choicesLandslidePlague of locusts (massive herbivore grazing)All of the answersFire

A farmer is struggling to control the population of a certain insect on his farm.  After researching population control techniques, he discovers that a particular bird is a predator of this insect.  The farmer purchases a number of these birds and releases them onto his farm.How might the farmer's action most likely have a negative impact on the ecosystem?ResponsesThe birds will increase biodiversity of native plant species.The birds will increase biodiversity of native plant species.The birds will pollinate native species, increasing genetic variation.The birds will pollinate native species, increasing genetic variation.The birds will consume beneficial insects, as well as the pest species.The birds will consume beneficial insects, as well as the pest species.The birds will mate with native birds and create a new species

Herbivory has the same effect on the two species involved as doesMultiple Choicecompetition.mutualism.parasitism.commensalism

What would be the most likely effect if several species of carnivores were removed from an ecosystem?*2 puntosAn increase in plant lifeA decrease in the number of natural disastersAn increase in species diversityA decrease in community stability