Populations

• What is a population

  Group of organisms of the same species living in the same area at the same time that can interbreed to make fertile offspring
• What is a habitat

  Part of an ecosystem in which particular organisms live
• What is a community

  all the populations of different species in the same area at the same time
• what is an ecosystem

  a community and the non-living components of an environment (the biotic and abiotic factors). Ecosystems can range in size from the very small to the very large
• what is a niche

  An organisms role within an ecosystem, including its position in the food web and habitat. Each species occupies its own niche governed by adaptation to both biotic and abiotic factors
• what is carrying capacity

  the maximum population size an ecosystem can support
• what are abiotic factors

  non-living conditions of an ecosystem
• what are biotic factors

  impact of the interactions between organisms
• What is the main topic discussed in the video?

  Populations, abiotic and biotic factors
• What are the key terms to know for topic seven?

  • Population
  • Community
  • Ecosystem
  • Niche
  • Carrying capacity
  • Abiotic factors
  • Biotic factors
• What is a population in biological terms?

  Groups of organisms of the same species
• What is a community in ecology?

  All populations of different species in an area
• What does an ecosystem include?

  Living and non-living components of the environment
• What is a niche in an ecosystem?

  An organism's role within the ecosystem
• Can two species share a niche?

  No, they will compete with each other
• What is carrying capacity?

  The maximum population size an ecosystem can hold
• What happens when a population exceeds its carrying capacity?

  Increased death rate to reduce population
• What are abiotic factors?

  Non-living conditions in an ecosystem
• Why is oxygen important in aquatic ecosystems?

  It is essential for aquatic life survival
• What is a biotic factor?

  Living components of an ecosystem
• What is competition in ecology?

  Interaction between organisms for resources
• What are the two types of competition?

  Interspecific and intraspecific competition
• What is interspecific competition?

  Competition between different species
• What is intraspecific competition?

  Competition among members of the same species
• What do organisms compete for?

  Space, food, water, and mates
• What is a predator-prey relationship?

  Interaction between predators and their prey
• What are the key patterns in predator-prey relationships?

  1. Both predator and prey populations fluctuate.
  2. Prey population peaks higher than predator population.
  3. Prey population changes before predator population.
• Why do predator populations lag behind prey populations?

  Predators depend on prey for food
• How does energy transfer affect predator-prey dynamics?

  Predators need more prey to sustain energy
• How do abiotic factors affect population sizes?

  • Non-living conditions influence species survival.
  • Harsh abiotic factors limit species diversity.
  • Favorable conditions support larger populations.
• How do biotic factors affect population sizes?

  • Interactions among organisms influence survival.
  • Competition for resources can limit population growth.
  • Predation affects prey population dynamics.