- Abiotic Factors
- Temperature - Each species has different optimum temp. Below this - enzymes work more slowly & metabolic rate is reduced. Above this temp - enzymes start to denature - slower growth. Warm-blooded animals - organisms expend much energy maintaining their normal body temp > less individual growth & slower reproductive rate. Population size decreases.
- Light - ultimate source of energy for ecosystems. Increase light intensity increases rate of photosynthesis > population increases. Then the population of animals that feed on that plant increases.
- pH - population of organisms is larger where the optimum pH exists.
- Water & humidity - smaller populations where water is scarce unless adapted to dry conditions. Humidity affects transpiration rates in plants > in dry air conditions, only those adapted to it will have larger populations