There must be a balance between the different types of population that interact and the resources available in their surroundings. Since, due to the uncertain future, some behaviors will determine if a stress limit must be reached. Where, the base growth, the ability to support the environment and adaptation of individuals will be essential.
This is why, to be in a balance there is environmental resistance, which depends on many factors in turn. And that it brings with it some essential characteristics that must be handled when talking about it. To learn more about this important topic, which spans both biology and ecology, stay with us and keep reading.
Meaning of environmental resistance
It is defined by biological and physical factors, responsible for preventing the organisms reach biotic potential. It is based on spoiling the growth and development of the species, where certain fundamental principles are covered, which is why it lends itself to restricting the continuity that occurs around the life of the populations.
This occurs when there is a number of individuals of the location that is close to carrying capacity. Which means that you are going to see an increase in what is known as environmental resistance. Therefore, in turn, it imposes on us that the growth rate of the population in question is decreasing.
There are some causes that help this type of regulation, since they can be internal or external. Everything that affects or change the number of individuals in a population, will produce a different result in environmental resistance.
What is environmental resistance in ecology and biology?
All those factors, circumstances and negative agents that impose constraints on the conditions of an ecosystem, can be divided. Since they manage to move by two means, despite the fact that the result is to restrict the level of stability of a system. These are the relationships between a population and the coexistence space that is ecology, like the origin and evolution of species in biology.
Within it we can find factors that are going to be dependent on the type of density, and they are going to be in nature. Such as predation nutrients, in the case of eagles it would be mice and parasitism. Or ticks with respect to livestock, which transmit diseases that if the number of organisms rises, infections will increase.
Another case would be behaviors at the time of reproduction, as in the fruit fly. Where there is too much population, the females retain the eggs if they do not find food or a place to deposit them.
On the other hand, if we talk about physical nature or ecology, we find factors independent of density. Light, climate, humidity, water, excess salt in seas or in the soil enter this group. Also the different pressures in aquatic environments, drought, rainfall, floods, the eruption of volcanoes. As well as the destruction of habitats by man, which in principle is due to the use of pesticides.
The growth of the population will depend on the change that occurs with respect to time, and the interactions that occur. If the density of the locality increases, with it the environmental resistance will rise, and there will be a decrease in the consistency of the population. At this point, environmental resistance can be considered something negative, but which in turn is the one who maintains a balance.
What objective is pursued with environmental resistance?
Its purpose is to prevent a population from reaching the top of what It is known according to biotic potential. As well as, regulate as far as possible its reproductive capacity in a fairly limited way. Therefore, through various resources and interactions between species, it works to carry out its purpose.
It uses a competition in the members of both the population, those that are nearby and the kingdom itself. Where the resources that are of vital importance to survive are scarce, and those that are in great demand much more. These comprise a wide variety, such as: water, food, shelter, territory, and mating partners. So it is that through competition between animals there is aggression in them in order to live.
What are the characteristics of environmental resistance?
In them we can find a series of things that together prevent the population of organisms grows without stopping. So they attack first the chances of reproduction, health decline and mortality increase. Among which we can highlight:
- Possess biotic factorswhich are those that are alive, such as: predation, lack of food, diseases, competition that exists between organisms.
- Have some abiotic component, (which are the non-living). In them we can highlight: drought, temperature, fire and even the wrong amount of sunlight.
- The percentage of which how well a group manages to survive is essential, as well as adaptation to the environment.
- With too many resources available For species to keep growing, there is competition that slows down reproduction.
- You must reach a balance between birth rate and death ratethus reaching its maximum load capacity.
What are the different types of environmental resistance?
There are two types of environmental resistance, we have the biotic ones that depend on the density of the population. And it is made up of all the components that are within the herds and that interact with the environment. On the other hand, we have the abiotics, which are those factors that are outside of the above. They do not depend on population density and are based primarily on climate changes. Next we will talk more in depth about the different types of environmental resistance.
biotic environmental resistance
Also called dense dependent, or intrinsic, and include the regulatory factors that are caused by population density. Which is one of the main reasons for deaths, through the organisms that generate these killings. Which means that as the number of individuals within the same territory increases, there is more tension when it comes to obtaining food.
Also when it comes to finding a partner for reproduction, which generates a tireless competition of fights. As well as territory, this in principle thanks to the arrival of the different individuals who emigrated. Another thing that we can highlight is predation or parasitism, diseases that may occur.
All these factors, known as biotic, that show living organisms, are those that influence within the ecosystem. We must bear in mind that these causes they are caused by the same species, among themselves, thus limiting their growth. Since they can talk about flora and fauna, the place and the interactions with it.
abiotic environmental resistance
Also called dense independent or extrinsic, these stop the increase of the population, but without depending on the density. In the abiotic factor, highlights the weather, such as rainfall, floods or droughts. Where the destruction of habitats influences, this is mostly due to man.
A high temperature affects the ecosystem, which is why the experience of the living beings that are in it intervenes. Other things are salinity, pressure and currents that there is in the middle. All these elements are external to the population, but they also cause mortality and inhibit reproduction. Therefore, many of them are unavoidable, since tsunamis or tremors that can disturb the order also enter.
What is the relationship between biotic potential and environmental resistance?
When we talk about biotic potential, we refer to the ability of organisms to reproduce. This, of course, within certain conditions that are optimal to carry it out in the best way. In addition, it is part of the maximum theoretical rate that corresponds to the ideal circumstances to increase the population.
On the other hand, environmental resistance represents the factors that prevent biota from reaching its biotic potential. Which means that these things will influence the continuity or not of the reproduction of the species. Population growth, increasing or decreasing, is due to actions on biotic potential and environmental resistance.
Examples of environmental resistance
Among them we can find various situations where environmental resistance is presentedso we can highlight:
- Lynxes and hares: It encompasses population regulation through the predator and prey format in between. A decline within the locality of hares will result in a deterioration in the number of lynx. Which means that a lower number of hares will produce an increase in lynxes. We must take into account that the dynamic population that hares have will depend on their food availability.
- Bacterial growth: The bacteria that are sown in a culture, it is possible to observe the development curve that they have. This is divided into four phases, as well as the initial exponential and the aftermath of environmental regulation. Starting with a stationary stage and ending with a decline effect on the population proportion. Going through the adaptation facet, where the bacteria are synthesized and then cell division occurs. Therefore, growth is generated, but it is affected by the reduction of nutrients that reduce the population rate. So there is a balance with the variation of bacterial death. Then comes the abrupt decrease in bacteria, since the nutrients in the culture have been depleted.
- Lemmings in Greenland: Its population is regulated by four species of predators: foxes, owls, birds, and stoats. This type of decline causes the population growth of lemmings to occur only every four years. By having a low predation, its percentage of individuals will increase, but if it is not, it will be affected. However, if there is a high population, predators will start hunting them more frequently. Causing a sudden decrease in the size of the town, due to the decrease in food. So a new cycle begins.
Environmental resistance is made up of the different factors that affect the reproduction of different species. As we have seen the food chain, the biological components and even the contamination contribute so that it is carried out. This is why the order of the chain is altered and some living beings end up becoming extinct.
The demand to survive in their environment and continue with their purpose, even if it costs them, is what drives them to move forward. But there must be a balance within the different habitats that we know, which is interfered by the variety of climate. As well as the lack of food, immigration, adaptation capacities and other characteristics that certain ecosystems have.