1. Food Webs & Energy Flow:
* Producers: Plants form the base of the food web, using sunlight to create their own energy through photosynthesis.
* Consumers: Animals rely on producers (herbivores) or other animals (carnivores) for food, transferring energy through the ecosystem.
* Decomposers: Organisms like bacteria and fungi break down dead organisms and waste, recycling nutrients back into the ecosystem for producers to use.
2. Predator-Prey Relationships:
* Predators control the populations of their prey, preventing overgrazing and keeping the ecosystem balanced.
* Prey populations fluctuate in response to predator populations.
* This dynamic relationship helps regulate the populations of both predator and prey.
3. Competition:
* Interspecific competition: Different species compete for the same resources, like food, water, or space.
* Intraspecific competition: Individuals within the same species compete for these resources.
* Competition influences population sizes and can lead to specialization, where species evolve to use different resources or occupy different niches.
4. Symbiosis:
* Mutualism: Both species benefit from the relationship. Example: bees and flowers (bees get nectar, flowers get pollinated).
* Commensalism: One species benefits, while the other is neither harmed nor helped. Example: barnacles on whales (barnacles get a place to live, whales are unaffected).
* Parasitism: One species benefits at the expense of the other. Example: tapeworms in humans (tapeworm gets food, human is harmed).
5. Keystone Species:
* Some species have a disproportionately large impact on the ecosystem. Their removal can cause significant disruptions.
* Example: Sea otters in kelp forests - they eat sea urchins, which in turn graze on kelp. Without otters, urchin populations explode, leading to kelp forest collapse.
Overall, the dependence of populations on each other in an ecosystem creates a delicate balance. If one population is affected, it can have ripple effects throughout the entire system. Understanding these relationships is crucial for maintaining biodiversity and ensuring the health and stability of ecosystems.
