APES Population Growth Models r and K
36 flashcards covering APES Population Growth Models r and K for the AP-ENVIRONMENTAL-SCIENCE Unit 3 section.
Population growth models, specifically r and K strategies, are essential concepts in AP Environmental Science, as outlined in the College Board's curriculum framework. These models describe how different species adapt their reproductive strategies to environmental conditions, with r-strategists focusing on rapid reproduction and K-strategists emphasizing stability and resource management. Understanding these models is crucial for analyzing ecological dynamics and species interactions.
On practice exams and competency assessments, questions about r and K strategies often involve scenarios where students must identify which strategy a given species exemplifies based on its reproductive traits and environmental context. A common pitfall is confusing the characteristics of the two strategies, particularly when species exhibit mixed traits or when external factors influence their growth patterns.
One practical tip to keep in mind is to always consider the environmental context when determining a species' growth strategy, as real-world scenarios often present complexities that challenge straightforward categorization.
Terms (36)
- 01
What is the r-selected species characteristic?
R-selected species are characterized by high reproductive rates, small body sizes, and short life spans, allowing them to exploit unstable environments effectively (College Board AP CED).
- 02
What is the K-selected species characteristic?
K-selected species are characterized by lower reproductive rates, larger body sizes, and longer life spans, typically thriving in stable environments with limited resources (College Board AP CED).
- 03
How does carrying capacity (K) affect population growth?
Carrying capacity (K) limits population growth by providing a maximum number of individuals that an environment can sustain, leading to logistic growth patterns (College Board AP CED).
- 04
What type of growth model do r-selected species typically follow?
R-selected species typically follow exponential growth models, characterized by rapid population increases when resources are abundant (College Board AP CED).
- 05
What type of growth model do K-selected species typically follow?
K-selected species typically follow logistic growth models, where population growth slows as it approaches the carrying capacity of the environment (College Board AP CED).
- 06
Which of the following is an example of an r-selected species?
Examples of r-selected species include insects, mice, and weeds, which reproduce quickly and in large numbers (College Board AP CED).
- 07
Which of the following is an example of a K-selected species?
Examples of K-selected species include elephants, humans, and whales, which invest more in fewer offspring (College Board AP CED).
- 08
What is the primary factor influencing r-selected species?
The primary factor influencing r-selected species is the availability of resources, which leads to rapid population growth in favorable conditions (College Board AP CED).
- 09
What is the primary factor influencing K-selected species?
The primary factor influencing K-selected species is the competition for limited resources, which stabilizes their populations around the carrying capacity (College Board AP CED).
- 10
How does environmental stability affect K-selected species?
Environmental stability allows K-selected species to thrive as they can invest in long-term survival strategies and parental care (College Board AP CED).
- 11
What is the significance of the intrinsic growth rate (r)?
The intrinsic growth rate (r) measures how quickly a population can grow under ideal conditions, influencing the dynamics of r-selected species (College Board AP CED).
- 12
What happens to r-selected populations when resources are depleted?
When resources are depleted, r-selected populations may experience a rapid decline as their growth is unsustainable in the long term (College Board AP CED).
- 13
How do r-selected species typically respond to disturbances?
R-selected species often quickly repopulate areas after disturbances due to their high reproductive rates and adaptability (College Board AP CED).
- 14
What is a key reproductive strategy of K-selected species?
A key reproductive strategy of K-selected species is investing in fewer offspring with higher survival rates, often involving parental care (College Board AP CED).
- 15
How does population density affect K-selected species?
Population density can significantly impact K-selected species, as increased competition for resources can limit growth and survival (College Board AP CED).
- 16
What is the role of predation in r-selected species populations?
Predation can limit r-selected species populations, but their high reproductive rates often allow them to recover quickly (College Board AP CED).
- 17
How does the concept of 'survivorship curves' relate to r and K-selected species?
Survivorship curves illustrate the different survival strategies of r-selected species (Type III) versus K-selected species (Type I), highlighting their reproductive strategies (College Board AP CED).
- 18
What is the effect of a sudden environmental change on r-selected species?
A sudden environmental change can lead to a boom in r-selected species populations, as they rapidly exploit newly available resources (College Board AP CED).
- 19
How do K-selected species manage resource competition?
K-selected species manage resource competition through strategies like territoriality, social structures, and parental investment (College Board AP CED).
- 20
What is the relationship between life history strategies and population growth models?
Life history strategies, such as r and K selection, determine population growth models, influencing reproductive rates and survival tactics (College Board AP CED).
- 21
What is the impact of human activity on K-selected species?
Human activity often threatens K-selected species through habitat destruction and resource depletion, leading to population declines (College Board AP CED).
- 22
How do r-selected species contribute to ecosystem dynamics?
R-selected species contribute to ecosystem dynamics by rapidly colonizing disturbed areas, enhancing biodiversity and ecosystem recovery (College Board AP CED).
- 23
What is the significance of the logistic growth model for K-selected species?
The logistic growth model is significant for K-selected species as it demonstrates how populations stabilize near carrying capacity due to resource limitations (College Board AP CED).
- 24
What reproductive strategy is common in r-selected species?
A common reproductive strategy in r-selected species is producing many offspring with minimal parental investment, maximizing reproductive success (College Board AP CED).
- 25
How does the concept of 'density-dependent factors' relate to K-selected species?
Density-dependent factors, such as competition and disease, significantly affect K-selected species' populations as they approach carrying capacity (College Board AP CED).
- 26
What is an example of a density-independent factor affecting r-selected species?
An example of a density-independent factor affecting r-selected species is a natural disaster, such as a flood or fire, which can drastically alter their populations (College Board AP CED).
- 27
How does r selection influence population recovery after a disturbance?
R selection influences population recovery after a disturbance by enabling rapid reproduction and colonization of available niches (College Board AP CED).
- 28
What is the primary focus of K-selected species in terms of reproduction?
The primary focus of K-selected species in reproduction is to enhance the survival of their offspring through care and resource allocation (College Board AP CED).
- 29
How do r-selected species typically interact with their environment?
R-selected species typically interact with their environment in ways that maximize resource exploitation and rapid growth, often leading to population booms (College Board AP CED).
- 30
What is the ecological significance of r-selected species?
The ecological significance of r-selected species lies in their ability to rapidly fill ecological niches and contribute to ecosystem resilience (College Board AP CED).
- 31
How do K-selected species adapt to their environments?
K-selected species adapt to their environments by developing traits that enhance survival and reproductive success in stable conditions (College Board AP CED).
- 32
What is the effect of resource availability on r-selected species?
Resource availability directly influences the population growth of r-selected species, allowing for exponential increases under favorable conditions (College Board AP CED).
- 33
How do K-selected species respond to environmental changes?
K-selected species typically respond to environmental changes more slowly, as they are adapted to stable conditions and have lower reproductive rates (College Board AP CED).
- 34
What is the role of parental investment in K-selected species?
Parental investment in K-selected species plays a crucial role in increasing offspring survival rates and ensuring long-term population stability (College Board AP CED).
- 35
How do r-selected species affect biodiversity?
R-selected species can enhance biodiversity by quickly colonizing disturbed habitats and creating opportunities for other species (College Board AP CED).
- 36
What is a key difference in reproductive strategies between r and K-selected species?
A key difference is that r-selected species produce many offspring with little care, while K-selected species produce fewer offspring with significant parental investment (College Board AP CED).