"types of population" is correct and could be used in written English.
For example, you could say: "The researcher investigated three types of population in the area."
Evolutionary adaptation to the environment occurred in both types of population; both were able to maintain higher numbers as the generations progressed.
Three types of population screening programs are in operation.
Systematic studies of design effects on different types of population parameters (means, ratios, frequency distributions, etc).
The types of population constructed in our interviews with Spanish biobankers are the result of two processes.
There are several types of population models such as interspecific competition models, predator-prey models, and facultative mutualism models [4].
Within each individual study area there are significant differences among communities in the types of population within lahar-prone areas (Figure 3).
Prevalence rates differed in different types of populations (Kruskal-Wallis P = 0.001).
It is important to distinguish between two types of populations: the survey population and the target populations.
For both types of populations, there is also increasing interest to detect fainter objects corresponding to the small end of the size distribution.
Nevertheless, both types of populations are useful to study the genetic structure underlying disease, providing direction to the investigation of susceptibility genes and genetic pathways.
Simple weighted averages calculated from a single study sample may be used to assess variability in accuracy in different types of populations.
