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Questions and Answers
What are density independent factors?
What are density independent factors?
- Factors that affect populations based on their density
- Only natural disasters
- Factors that can affect a population regardless of its density (correct)
- Only temperature related
What are some examples of density independent factors?
What are some examples of density independent factors?
Natural disasters, temperature, sunlight, human activities, physical characteristics, and behaviors of organisms.
Which of the following is a density independent factor that can affect aquatic life?
Which of the following is a density independent factor that can affect aquatic life?
- Population density
- Food availability
- Predation
- Temperature (correct)
Natural disasters have no impact on aquatic life.
Natural disasters have no impact on aquatic life.
How does temperature influence aquatic life?
How does temperature influence aquatic life?
The maximum depth that sunlight can penetrate into water is _____ meters.
The maximum depth that sunlight can penetrate into water is _____ meters.
Give an example of how human activities can impact aquatic populations.
Give an example of how human activities can impact aquatic populations.
What can physical characteristics of organisms do?
What can physical characteristics of organisms do?
How can behaviors of organisms affect their population?
How can behaviors of organisms affect their population?
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Study Notes
Density Independent Factors
- Density independent factors influence populations regardless of their density.
- Examples include natural disasters, temperature, sunlight, human activities, and organism characteristics.
Natural Disasters
- Events like droughts, floods, hurricanes, and fires can severely impact aquatic ecosystems.
- For instance, droughts can decrease water levels in lakes, lowering their carrying capacity and affecting fish populations.
Temperature
- Temperature plays a crucial role in the growth and activity levels of organisms.
- Different species have specific preferred temperature ranges; deviations can cause mortality or migration.
- Higher temperatures increase the rate of chemical reactions in water, but warm water holds less oxygen, posing challenges for aquatic life.
Sunlight
- Sunlight penetration is limited to about 30 meters in aquatic environments.
- Most photosynthesis occurs near the water's surface, restricting plant growth in deeper areas.
Human Activities
- Human actions can disrupt natural population dynamics, such as water level changes due to hydroelectric dams.
- Lake sturgeon may be affected when water levels drop suddenly during spawning, exposing and killing eggs.
Physical Characteristics
- The physical traits of organisms impact their survival and reproductive success.
- Adaptations, such as warning colors in toxic fish species or camouflage, help species evade predation.
Behaviors
- Behavioral patterns can significantly influence population dynamics.
- Migration for food or mating, as well as social structures like schools in fish (e.g., white bass), are vital for survival and reproduction.
- Specific mating behaviors can also drive population changes.
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