Final answer:
The question pertains to studying population dynamics in rabbits, a biological concept. Researchers can use various methods to measure population size and density, and changes in a population can be attributed to factors such as predation, food availability, and environmental conditions.
Step-by-step explanation:
The subject discussed in the question relates to the study of population dynamics in rabbits, which is a topic in the field of Biology. The Gizmo mentioned is a simulation tool used in educational settings that can help students understand how rabbit populations change with the seasons and what factors contribute to these changes. For example, to determine population size and density, a researcher might use methods like direct counts, mark-recapture techniques, or estimation based on indirect signs. The video resources provided above can enhance understanding of these concepts.
As for the case of the vole population study, the significant increase in population size and reproductive success might be attributed to a variety of factors such as reduced predation better food availability or favorable weather conditions leading to increased survival rates. It's important to consider the ecological principles of carrying capacity and limitations due to food and predators, as evidenced in Figure 1 showing the predator-prey dynamics of snowshoe hares and lynx.