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Population Size - Coggle Diagram
Population Size
decline
density-dependent limiting factors
predation
increase with density, focus on the most abundant prey
parasitism and disease
increase with crowding
closer individuals are easier it is for pathogens to spread
limited mating option=less genetic variability=higher rates of genetic disorders and diseases such as cancer
competition for limited resouces
infraspecific competition
fail to secure what they need to survive and reproduce
animals compete for nesting sites, hiding places, food, water
compete with humans as they inhabit more land, taking away habitats of plants and animals
plants compete for nutrients, water, access to sunlight
density-independent factors
natural disasters or weather related events
volcano eruption, hurricane, human caused events such oil spills, fire, and deforestation
reindeer on St. Matthew Island
growth
exponential growth
biotic potential
age when reproduction begins
how long remain reproductive
number of offsprings produced every time reproduce
microbes (bacteria)
happens in any population in which birth rate exceeds death rate