ABIOTIC AND BIOTIC INFLUENCES ON ECOSYSTEMS
The upper limits of a population are determined by _______________. These biotic or
abiotic factors determine where a species can live and what species can flourish in certain
habitat. Humans endeavour often affects liming factors.
ABIOTIC FACTORS
All species have a
within which they can survive. Species can be
successful over a range of abiotic factors (optimal range), but become stressed when the
limits of tolerance are exceeded.
Draw tolerance graph p. 52
_______________ ecosystems are largely determine by the amount of precipitation, the
temperature and the amount of sunlight, while _____________ ecosystems are mainly
dependent upon the salt content, amount of light oxygen and nutrients.
HUMAN ACTIVITY ON KEY ABIOTIC FACTORS
Aquatic ecosystem
Terrestrial ecosystem
BIOTIC FACTORS
Many key biotic factors involve interactions between individuals. The most common types
of species interactions are competition, predation, mutualism, commensalism and
parasitism
CARRYING CAPACITY
The upper sustainable limit an ecosystem can support is dependent on the availability of
key biotic and abiotic factors. Humans affect this by adding and removing resources.
Do questions on p. 55 #1-8