List three factors that are contributing to the decline of pollinator populations

Indicate whether the statement is true or false: Aquatic ecosystems can receive a large input of a limiting nutrient from the runoff from heavily fertilized fields

Review the following figure, and then answer the two questions that follow.   a)Given that beak size in mature adults does not change, what factor is driving the change in average beak size in Galápagos finches over time? Seed number Seed size Rainfall amounts Both b. and c. All of the above.   b)What would you predict about beak size if the Galápagos experiences a wet year? More birds with small beaks will survive More birds with large beaks will survive Both a. and b. All of the above

In response to warmer spring temperatures, a plant species is flowering earlier in the year than it would have historically. However, its primary pollinator, the bumblebee, has not been as responsive to temperature changes and continues to emerge at the same time as usual. As a result, peak floral displays have finished prior to pollinator emergence. This change in plant-pollinator interactions is an example of: a.Uncoupling of interdependent species b.Sympatric speciation c.Heterochrony d.Interspecific evolution

One of the questions the researchers asked when they began their experiment was “With wolves now back on the Yellowstone landscape for 15 years, how has the reintroduction of wolves affected the recruitment of the woody browse species?

Long-term fertilization of plant communities often results in increased species richness.   True  False

Two winters ago, a species of bird called the pine siskin began appearing in droves at backyard bird feeders in my hometown. We would occasionally spot a few each winter, but numbers were unusually high that year. The next winter, it seemed as if all of the "extra" pine siskins had disappeared. Numbers fell back to the levels that we were used to seeing. Use the concept of carrying capacity to explain the irruption of pine siskins described in the scenario. Provide your answer in a standard paragraph using complete sentences

Compare the survival and reproduction strategies of altricial species and precocial species. Although quite different, why are they both successful in maintaining the population of a species? ✓✓✓

Hawaiian forests grow on nutrient-poor, volcanic-derived soils that have Very low phosphorus levels. In an experiment, scientists fertilized some areas of Hawaiian forest with phosphorus. As a control, they left other areas unfertilized. After one year, they observed increased tree growth on fertilized sites. Fertilized trees supported 37% more herbivorous insect biomass than unfertilized trees. These findings provide evidence that: Hawaiian forest food chains exhibit bottom-up structure Hawaiian forest food chains exhibit both bottom-up and top-down structure Hawaiian forests are resilient but not necessarily resistant Hawaiian forests exhibit alternate stable states Hawaiian forest food chains exhibit top-down structure

One concern about reliance on European honeybees for pollination is that we are heavily dependent on a single species for crop production these bees were introduced from Europe European honeybees are not efficient pollinators European honeybees produce relatively small amounts of nectar European honeybees are unusually aggressive