One of the widely developed sciences is ecology. The characteristics of populations, their environments or the relationships between them have become an object of study for scientists. What exactly is population ecology and what data does it analyse? How is the theory of population ecology used today? In this article you will find everything you need to know about this field of science.
What is population ecology?
Not everyone wonders why some species remain in the same habitats for many years, while others migrate frequently. A group of individuals inhabiting a selected area is a biological population. However, this definition is heavily truncated and, compared to what lies behind the term population ecology, says nothing. Population ecology is one part of the ecology of a species and focuses mainly on what its abundance, density, spatial, age and sex structure is. This science deals with the study of migration and changes in the occurrence of individuals based on biological factors.
Starting with abundance, it is worth mentioning how important it is during measurements. Determining it will help in the subsequent calculation of population densities. Both aspects are equally important as they can help predict future changes - e.g. in the case of species on the brink of extinction. Two types of measurements are used to calculate abundance in groups occurring in a specific area: the multiple catch and quadrat method - these allow sampling to estimate the abundance of plants and other organisms.
After calculating the above-mentioned variables, it is also worth calculating the distribution. This shows how groups of the population spread over the selected area and what might be the reason for this. There are three ways: clustered distribution, uniform distribution and random distribution. This also applies to immigration and emigration of groups for different purposes.
Another significant aspect of research in population ecology is reproduction and mortality. Observing species from this angle allows the estimation of survival and reproductive levels, which is particularly important for endangered species.
Areas of interest and limitations of population ecology
Population ecology may seem like a field of science with a rather narrow scope of work, but its area of research is really broad. It started with the question "what is a population?", which has evolved over the years into complex issues alluding to correlations that are impossible to think of. But what are the main interests of population ecology researchers?
Patterns of environmental use specific to selected animals, the impact of demography on a population, its density or distribution, the behaviour of individuals during migration or the acquisition of environmental information are just some of the areas of interest for population ecologists. It should not be forgotten how much influence they have on the conservation of endangered species. However, we will talk about this later in this article.
Constraints during research relate to environmental conditions such as predation, disease or competition. Constraints may also occur due to meteorological changes.
Population ecology and the conservation of endangered species
It will come as no surprise that population ecology has a huge impact on the conservation of species at risk of extinction. Censusing the distribution of individuals in the environment can help in planning measures against their extinction.
Based on studies conducted on populations, it is possible to determine what is causing the uncertain future of certain species. Population ecologists are concerned with the detailed analysis of environmental changes, relationships between individuals of the same species and even environmental conditions. This makes it possible to determine predictions for the further history of species and implement conservation measures.
The use of population ecology theory today
Animal population and all related aspects are also measured in metropolitan areas. However, let us return to history for a moment to see what relevance the theory of population ecology has had for the environment.
The forerunner was Thomas Malthus, whose theory was that population growth would always outstrip food supplies. This would prevent the improvement of humanity, so reproduction among species should be limited. This theory evolved over time and was later developed by Charles Darwin on the basis of his theory of natural selection.
Nowadays, it is used to identify patterns of success and the object of study is not the organisation itself, understood in a management context, but its population. The concept assumes that different types of populations select different individuals who are able to survive in competition and these are studied to determine the strategies chosen by successful organisations. The relationships between individuals are also analysed.
