Which of these research topics would be considered an example of community ecology? view available hint(s) which of these research topics would be considered an example of community ecology? scientists studying the american bullfrog have reported that the longer a bullfrog remains in the tadpole stage, the greater the chance of its survival once it undergoes metamorphosis. an agricultural ecologist investigated the effect of fertilizers on corn crop yields. a researcher found that the reproductive success of bumblebees decreased when the population density of honeybees increased. the decline in the number of bumblebees appeared to be a result of competition for nectar. a graduate student collected information about the age structure of the black bear population in wisconsin.