MODULE 5 Flashcards
What typifies the innate dynamism of organisms?
Cycles and patterns.
How does population growth relate to resources?
Resources can impact the rate of population growth through reproduction.
What role do microorganisms play in biogeochemical cycles?
Microorganisms are known as key drivers of global biogeochemical cycles.
How can human population alter biogeochemical cycles?
Through population size and productivity connected by technology and socio-cultural activities.
Who proposed the first theoretical treatment of population?
Thomas Malthus in his 1798 work ‘Essay on the Principle of Population.’
What is the logistic growth model?
It describes population growth under ideal conditions relying on available resources.
What is the logistic equation?
dN/dt = rN(1-N/K) where N is population size, r is intrinsic rate of increase, and K is carrying capacity.
Who updated Verhulst’s population dynamics equation?
Alfred Lotka and Vito Volterra.
What demographic factors affect population size?
Birth, death, immigration, and emigration.
What visual tools can represent population expansion and shrinking?
Life tables, survivorship curves, and age structures.
What is a life table?
A record of birth and death of organisms per life stages.
What do survivorship curves represent?
A simplified graphical representation used in life tables.
What is age structure in population studies?
A ‘groufie’ of a population at a specific moment in time, clustered according to age and sex.
What does the exponential growth model illustrate?
A J-shaped curve representing population growth without environmental resistance factors.
What is carrying capacity?
The total number of individuals that the environment can support.
What does the logistic growth model show?
As resources diminish, the population reaches a plateau, represented by an S-shaped curve.
What are the two types of population regulation factors?
Density dependent factors and density independent factors.
What are density dependent factors?
Biotic factors like disease and predation that intensify death and birth as population increases.
What are density independent factors?
Abiotic factors that exert the same effects regardless of population size.
