Population ecology is the study of how populations ... rather than by accidental or deliberate introduction by humans. introduced species: A species that originated in a different region ...

Demographics can include any statistical factors that influence population growth or decline, but several parameters are particularly important: population size, density, age structure ...

Basic concepts in population genetics, including nucleotide diversity, random genetic drift, effective population size, coalescent theory, time to common ancestor, site frequency spectrum, linkage ...