Topic 3 (LEC) - Population Ecology Flashcards
These are patterns of dispersion
Clumped
Regular/uniform
Random
This refers to the downstream movement of organisms, particularly aquatic invertebrates or small fish, in a water body.
Drift
Evenly spaced pattern of dispersion
Regular/uniform
Changes in the density of predator populations in response to increased prey density
Numerical responses
A group of individuals of a single species living in the same general area, described by their boundaries and size
- Rely on the same resources
- Influenced by similar environmental factors
- Likely to interact and breed with one another
Population
The pattern of spacing among individuals within the boundaries of the population
Dispersion
These explain the dynamics of population dispersal and survival in freshwater ecosystems
Spates
Drift
Colonization cycle
These are characteristics of population
Distribution
Density
Abundance
Dispersion
The number of individuals per unit area or volume
Density
The most common pattern of dispersion; individuals are aggregated in patches
Clumped
Concern in understanding the factors influencing the expansion, decline, or maintenance of populations
Population dynamics
It occurs where key physical or chemical factors are relatively constant across the study area
Random pattern of dispersion
A theory that provided a mechanism for evolutionary change in populations
Darwin’s Theory of Evolution by Natural Selection
The total number of individuals, or biomass, of a species in a specified area
Abundance
These are sudden increases in water flow, typically caused by heavy rain or snowmelt, that result in temporary flooding in streams or rivers.
Spates
