Effect of Density of Populations
Owen Perez
7 min read
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Study Guide Overview
This AP Biology study guide covers population dynamics, focusing on overpopulation, carrying capacity, and logistic growth. It differentiates between density-dependent and density-independent factors influencing population size. The guide also provides the logistic growth equation, example calculations, practice questions, and exam tips.
#AP Biology: Population Dynamics - The Night Before 🌃
Hey! Let's get you prepped for the AP Bio exam with a quick run-through of population dynamics. We'll focus on what's really important and make sure you're feeling confident. Let's dive in!
#Population Overgrowth and Its Consequences
Overpopulation happens when a population's density exceeds the ecosystem's resource availability. This leads to competition, reduced growth rates, and can even harm the population's overall health. Think of it like too many people trying to fit into a small house – things get crowded and uncomfortable! 🏠
- Overpopulation occurs when a population surpasses the carrying capacity of its environment.
- Consequences include:
- Resource depletion
- Increased competition
- Decline in population health and fitness
#Density-Dependent vs. Density-Independent Factors
Populations are always juggling factors that either help or hinder their growth. Let's break them down:
#Density-Dependent Factors
Remember: Density-dependent factors have a greater impact as a population gets larger. These factors are often the focus of FRQs, so make sure you understand them well.
- These factors change their effect based on population size.
- Examples:
- Food Access: More individuals = less food per capita.
- Predation: Larger prey populations can attract more predators.
- Disease: Diseases spread more easily in denser populations.
- Migration: Overcrowding can trigger migration.
#Density-Independent Factors
Density-independent factors affect populations regardless of their size. They're often unpredictable and can cause rapid population declines. 📉
- These factors affect populations regardless of their size.
- Examples:
- Weather: Extreme temperatures, storms, and droughts. ...
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