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View Resource Forest Ecosystem Responses to Chronic Nitrogen Additions

In this activity, students work with data collected during 15 years as part of a long-term research project at Harvard Forest. Students analyze the data to address the question, "How have stands of pine and hardwood forest responded to long-term nitrogen fertilization?" Students address the question using data on several ecosystem characteristics and processes: net primary productivity, tree...

 

Publisher: EcoEd Digital Library

View Resource The Insect Predation Game: Evolving Prey Defenses and Predator Responses

In this activity, learn about predator-prey interactions by pretending to be generalist insect predators foraging for three prey species (candy). Three feeding adaptations are used (mandibles, raptorial forelegs, and unmodified legs). Students conduct several simulations, each of which lasts about a minute. After each simulation, prey reproduce and predator numbers are adjusted to reflect...

 

Publisher: EcoEd Digital Library

View Resource Observing and Quantifying Predator-avoidance Behavior: Habitat Shifts by Snails in Response to Predator Cues

In this activity, students conduct an experiment to test a hypothesis about how freshwater snails detect and avoid fish predators using chemical cues and habitat complexity. Students generate a hypothesis, run the experiment, collect data, analyze data, and interpret their results. Instructions are also provided for further thought and discussion on the implications of the students' findings and...

 

Publisher: EcoEd Digital Library

View Resource Testing Hypotheses about Herbivore Responses to Plant Vigor and Herbivore Impact on Plant Reproduction

In this laboratory exercise, students examine hypotheses about the interactions between goldenrod plants and the gall-forming insects that feed on them. Students collect and analyze data to determine 1) whether certain traits make the plants more susceptible to attack by the insects and 2) how plant reproduction is affected by the insects' feeding. Students are introduced to several competing...

 

Publisher: EcoEd Digital Library

View Resource Do Antbirds Help or Hinder Army Ants?

In this activity, students examine the nature of the interaction between army ants and ant-following birds. Ant-following birds benefit from the relationship by staying just ahead of the ants and capturing prey animals that are disturbed by the ants. While early studies suggested that the birds' foraging might in turn benefit the ants, it is possible that the birds remove prey that the ants would...

 

Publisher: EcoEd Digital Library

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