Ecosystems consist of living organisms interacting with each other and their physical environment, influencing resource availability and species distribution.
Predator-prey dynamics shape population sizes; predators control prey numbers by consuming them, which indirectly affects plant growth.
Symbiosis involves long-term relationships between species: mutualism benefits both, commensalism benefits one without harming the other, and parasitism benefits one at the expense of the other.
Competition arises when species vie for the same resources.
This can drive resource partitioning, where species adapt by utilizing different resources or using them at different times or places.
It limits direct competition and allows coexistence.
The trap is thinking of ecosystems as static.
They're constantly shifting with resources determining species distribution and survival.
Misunderstanding this dynamic leads to oversimplified models that miss how changes in one component affect the entire system.
This interconnectedness runs through everything in environmental science.
Energy moves linearly through trophic levels, losing about 90% at each step, while matter cycles repeatedly.
Recognizing these patterns is essential for understanding food webs, ecosystem productivity, and pollution problems.
Grasp these dynamics, and the rest of the course builds logically from these principles.