All flashcards
Flashcard 1: What is the main purpose of setting system boundaries in ecosystem modeling?
Answer: To focus the model on a specific question by limiting what is studied. Boundaries simplify complex ecosystems to answer specific questions.
Flashcard 2: Identify the temporal boundary in: measuring fox and rabbit populations from April to June.
Answer: April to June. This three-month period defines when data collection occurs.
Flashcard 3: Which system components must be included when modeling energy flow through a food web?
Answer: Producers, consumers, decomposers, and the energy source (sunlight). These trophic levels form the complete energy transfer pathway.
Flashcard 4: Find the best boundary for: tracking fertilizer runoff effects on a lake after rainstorms.
Answer: A watershed-to-lake spatial boundary including runoff inputs. Watershed boundaries capture the runoff source affecting the lake.
Flashcard 5: Identify the boundary error: a pond model ignores fish that eat the studied insects inside the pond.
Answer: The boundary excludes an important interacting biotic component (fish). Fish predation on insects is a key interaction being overlooked.
Flashcard 6: What is the best criterion for deciding whether a factor belongs inside the system boundary?
Answer: Include it if it significantly affects the model question and outcomes. Relevance to the research question determines inclusion.
Flashcard 7: Which two categories must you decide when defining an ecosystem model boundary?
Answer: Included components and excluded components. Every component must be classified as inside or outside the boundary.
Flashcard 8: What is the difference between biotic and abiotic factors when setting boundaries?
Answer: Biotic are living; abiotic are nonliving environmental factors. This distinction helps classify ecosystem components by life status.
Flashcard 9: What is a spatial boundary in an ecosystem model?
Answer: A physical area limit, such as a pond, plot, shoreline, or watershed. Geographic limits define where the ecosystem starts and ends.
Flashcard 10: What is a temporal boundary in an ecosystem model?
Answer: A time limit for the model, such as days, seasons, or years. Time boundaries determine when observations begin and end.
Flashcard 11: What is a functional boundary in an ecosystem model?
Answer: A limit based on which processes are included (for example, predation only). This boundary type selects specific ecological interactions to study.
Flashcard 12: What is an input in an ecosystem model across the system boundary?
Answer: Matter or energy entering the system (for example, sunlight or nutrients). Inputs cross boundaries to add resources to the ecosystem.
Flashcard 13: What is an output in an ecosystem model across the system boundary?
Answer: Matter or energy leaving the system (for example, heat or organisms emigrating). Outputs cross boundaries to remove resources from the ecosystem.
Flashcard 14: What does it mean if a model treats the ecosystem as an open system?
Answer: It exchanges both matter and energy with its surroundings. Open systems allow both materials and energy to cross boundaries.
Flashcard 15: What does it mean if a model treats the ecosystem as a closed system?
Answer: It exchanges energy but not matter with its surroundings. Closed systems only allow energy transfer across boundaries.
Flashcard 16: Which option best describes how boundaries affect model complexity: wider or narrower boundaries?
Answer: Wider boundaries usually increase complexity; narrower boundaries reduce it. More components inside boundaries means more interactions to track.
Flashcard 17: Identify the boundary choice that best fits: studying algae growth only inside one pond.
Answer: A spatial boundary limited to one pond. The pond edge creates a clear geographic limit for the study.
Flashcard 18: What is an abiotic factor that is commonly included inside ecosystem model boundaries?
Answer: Nonliving conditions such as water, light, temperature, or soil. Abiotic means non-living environmental factors.
Flashcard 19: What is a biotic factor that is commonly included inside ecosystem model boundaries?
Answer: Living organisms such as producers, consumers, and decomposers. Biotic means living components of the ecosystem.
Flashcard 20: Which term names the physical area chosen for an ecosystem model (for example, a pond or meadow)?
Answer: Spatial boundary. Defines the geographic limits of the modeled ecosystem.
Flashcard 21: Which term names the time span chosen for an ecosystem model (for example, a day or a year)?
Answer: Temporal boundary. Defines the duration over which the model operates.
Flashcard 22: What is a key trade-off when choosing narrow versus wide ecosystem model boundaries?
Answer: Narrow is simpler; wide is more realistic but more complex. Smaller boundaries simplify but may miss important interactions.
Flashcard 23: Which option best defines an open system in ecosystem modeling?
Answer: A system that exchanges matter and energy with its surroundings. Open systems have both matter and energy crossing boundaries.
Flashcard 24: Which option best defines a closed system in ecosystem modeling?
Answer: A system that exchanges energy but not matter with its surroundings. Closed systems only allow energy transfer, not matter.
Flashcard 25: Identify the type of boundary error: leaving out a predator that strongly controls prey numbers.
Answer: Boundary too narrow (missing a key component). Omitting important species makes the model incomplete.
Flashcard 26: Identify the type of boundary error: including many distant species that do not interact with the focal area.
Answer: Boundary too broad (including irrelevant components). Including unconnected elements adds unnecessary complexity.
Flashcard 27: Which option is an example of an input across an ecosystem boundary: sunlight, heat loss, or decomposition?
Answer: Sunlight. Energy from the sun enters from outside the ecosystem boundary.
Flashcard 28: Which option is an example of an output across an ecosystem boundary: rainfall, immigration, or heat loss?
Answer: Heat loss. Thermal energy leaves the ecosystem as an output.
Flashcard 29: What is the correct boundary decision if the question is about nutrient runoff effects on a pond?
Answer: Include the pond and the runoff source area as inputs. Both the affected area and source of impact must be modeled.
Flashcard 30: What should be included inside the boundary for a model of a forest food web?
Answer: Producers, consumers, decomposers, and their interactions in the forest. Food webs focus on organisms and their feeding relationships.