Commensalism is a form of ecological interaction between species in which one species benefits from the presence of the other, without causing harm or benefit to the host. In this type of relationship, only one species benefits, while the other suffers no significant harm. There are different types of commensalism, such as inquilinism and facilitated foraging. Some common examples of commensalism include pilot fish, which benefit from the protection of sharks, and birds, which feed on the food left behind by mammals. This type of interaction is essential for maintaining ecological balance in ecosystems.
Types of commensalism: learn about the different forms of interaction between species.
Commensalism is a form of ecological interaction between species in which one species benefits while the other is neither harmed nor benefited. In this type of relationship, one species, known as a commensal, takes advantage of the food scraps or other available resources of another species, called a host.
There are different types of commensalism, each with specific characteristics. One example is facultative commensalism, in which the diner can survive without the presence of the hostess, but benefits from the interaction. The obligate commensalism occurs when the diner depends on the hostess to survive.
Another type of commensalism is tenantism, in which the commensal takes shelter in the host's body without harming it, as is the case with birds that build nests in trees. metabiosis It is a form of commensalism in which the diner eats the leftovers left by the host, without harming her.
Some examples of commensalism include pilot fish feeding on sharks' food scraps, birds feeding on insects disturbed by livestock, and humans benefiting from gut bacteria that aid digestion.
In short, commensalism is a form of interaction between species in which one species benefits without harming the other. There are different types of commensalism, each with specific characteristics, but all demonstrating the complexity and diversity of ecological relationships in nature.
Learn about the four types of ecological interactions present in nature.
Understanding the four types of ecological interactions present in nature is essential to understanding the relationships between living beings in an ecosystem. One of these types of interactions is commensalism, which occurs when one species benefits from the presence of another without causing any harm or benefit to itself.
In commensalism, one species benefits while the other is not affected, either positively or negatively. There are two types of commensalism: facultative, in which the benefiting species can survive without the presence of the other, and obligate, in which the presence of the other species is essential for the survival of the benefiting species.
A classic example of commensalism is the relationship between sharks and remoras. The remoras attach themselves to the sharks and feed on the food left behind, while the sharks are unaffected by the remoras' presence. Another example is the relationship between birds that feed on insects that are driven away by cattle while they feed, without causing any harm to the animals.
Commensalism is one of the most interesting forms of ecological interaction, as it demonstrates how species can benefit each other without harming each other. It's important to study these relationships to better understand the complexity of ecosystems and how living beings interact with each other.
Understand commensalism and its relationships between organisms of different species.
O commensalism Commensalism is an ecological relationship in which one organism benefits while the other is not affected, either positively or negatively. In this type of interaction, one species benefits while the other suffers neither harm nor gain. We can observe various forms of commensalism in nature, where one organism feeds on the remains left by another, without harming it.
There are different types of commensalism, such as facultative commensalism, where one organism can survive without the presence of another, and symbiotic commensalism, where the relationship is closer and the organisms depend on each other for survival. Some examples of commensalism include the relationship between whales and penguins, where the penguins feed on the fish remains left by the whales without harming them.
O commensalism It's an interesting form of interaction, as it demonstrates how organisms can benefit from each other, even if they are different species. This relationship can be observed in various natural environments, where cooperation between organisms is essential for their survival.
Understanding amensalism: definition and practical examples of disharmonious ecological interactions.
O amensalism Amensalism is a form of disharmonious ecological interaction in which one species is harmed while the other is unaffected. In this type of relationship, one species releases toxic substances into the environment, preventing the growth or survival of other species. A practical example of amensalism is the release of chemicals by certain plants that inhibit the growth of other nearby plants.
On the other hand, the commensalism Commensalism is a form of ecological interaction in which one species benefits while the other is unaffected. In this type of relationship, one species utilizes available resources without harming the other. A classic example of commensalism is the relationship between sharks and remoras, in which the remoras attach themselves to the shark to move around and feed on the shark's food scraps without harming it.
In commensalism, the species that benefits is called the diner, while the species that is not affected is called hostessThere are different types of commensalism, such as facultative commensalism, in which the commensal species can survive without the host, and obligate commensalism, in which the commensal species depends on the host to survive.
In short, while amensalism represents a disharmonious interaction in which one species is harmed, commensalism represents a harmonious interaction in which one species benefits without harming the other. Both types of ecological interactions play an important role in ecosystem dynamics and the maintenance of biodiversity.
Commensalism: characteristics, types, examples
O commensalism It is a type of interaction between two species where one benefits, while the other suffers no harm, but is also not favored. In other words, it is a unidirectional relationship.
Generally, the individual obtaining the benefit is physically anchored to or within the organism with which it interacts. Commensal relationships are classified according to the benefit obtained in phoresis, lease, and chemical commensalism relationships.
In the first case, the species benefits from transportation by physically anchoring itself to the body of a larger animal. This association often provides, in addition to mobility, a safe haven from predators.
Location offers advantages in terms of habitat availability. Some species can modify their environment, creating new niches for other species.
Chemical commensalism involves the degradation of chemical compounds from one species into products that are energetically useful to a second species. It has been reported primarily in bacteria.
Furthermore, commensalism can be either facultative or obligate. In the former case, the benefiting species can survive even if its symbiotic partner is absent. This contrasts with obligate commensalism, where the benefiting species survives for a short period of time without the other species.
In nature, we find several examples of this type of interaction, involving animals and plants such as microorganisms. Tree epiphytes, small fish that live anchored to the surface of larger fish, and our intestinal flora are prominent examples of commensalism.
Characteristics of commensalism
Biological interactions
In biological communities, the species that are part of them interact in different ways, in extensive and intricate networks of interaction.
The relationship can be beneficial or have negative consequences for the species involved. Biologists have classified these relationships based on how the organisms involved are affected.
When two species establish a very close, long-term relationship, it's known as symbiosis. This "pair" lifestyle can manifest itself in three different ways: parasitism, mutualism, or commensalism.
Note that although the term symbiosis popularly connotes positive interactions between organic beings, it also includes relationships between parasites and their hosts.
Definitions of commensalism: theoretical and practical
Commensalism is an interaction in which only one of the organisms derives some kind of direct benefit from the relationship. Its partner, however, is not affected in any way.
Theoretically, one of the most important characteristics to consider an interaction as “commensalism” is that the relationship between species is unidirectional.
However, putting this into practice is difficult—and, in some cases, impossible. For this reason, a broader and more useful definition of commensalism is the interaction between two species, where one benefits and the other is barely affected, either positively or negatively.
PREMIUM QUALITY
-According to the benefit
Commensalism may involve different benefits for one species, such as transportation, obtaining food, or protection from predators or unfavorable abiotic conditions.
The first classification system we'll mention for commensal relationships is based on the type of relationship one species forms. Below, we'll describe each:
phoresis
The term phoresis is used when a species is mechanically transported by another species, called the host. The relationship does not involve any penalty (nutritional or energetic) for the species assuming the host role.
Silviculture is a way to locate a temporary microhabitat with a high degree of predictability and provides potential emigration when the temporary habitat disappears.
This phenomenon compensates for the small size of these groups, allowing them to travel longer distances. It also compensates for the lack of adaptations, such as the absence of wings, among others.
Carrying a much larger animal offers several other advantages, including protection from predators and adverse environmental conditions. In some cases, the transported species can consume the remains of food hunted by the host.
The most notable example of phoresis in nature occurs in arthropods. Adaptations of this type have undergone impressive radiation in the group of mites ( Acari ).
Tenant
This type of commensalism describes the use of a secondary species as a type of platform or cavity that will serve to shelter the species that will benefit.
The concept of leasing is even broader and involves any species that uses as a place to spend the night any structure built by another species, such as nests or burrows.
Conceptually, the term overlaps with other types of commensalism, such as metabiosis, also called thanatocresia. In these cases, one species modifies its habitat, and this modification is used by a second species.
In general, earthworms and other soil-dwelling organisms are considered metabionts, as they are responsible for modifying conditions in a positive way, and a wide variety of species are capable of colonizing the environment thanks to initial reforms.
Thanatocrecy refers to the use of any resource left behind by a dead animal. For example, hermit crabs use shells that leave certain snail species empty.
chemical commensalism
Chemical commensalism is a very specific type of commensalism that generally—but not always—applies to an interacting system consisting of two bacteria. It has also been reported for yeast.
In this case, one type of bacteria metabolizes a chemical that is not useful to the second. The metabolic product of the reactions carried out by the first bacterium is now useful to the second bacterium.
-According to the need for interaction
Additionally, there is another classification system. Commensalism can be classified according to the relationship participants' need for their partner. Thus, we have obligate and optional commensalism.
Required
In obligate commensalism, one organism is entirely dependent on its relationship with the other species. When its partner disappears, the survival of the beneficiary species declines significantly.
This type of commensalism can be found in the relationship between certain species of mollusks and annelids with a species of chelicerate commonly known as the horseshoe crab or crab ( Limulus ).
Small invertebrates are usually attached to the surface of the crab pot and reside obligately in its shell.
Optional
In facultative commensalism, the species that gains the benefit in the relationship can survive when its mate is absent.
The Arctic wolf, for example, benefits from food scraps collected by the polar bear. This reduces the wolf's energy expenditure in catching prey and makes the process much easier. However, in the bear's absence, the wolf can survive by hunting its own food.
Another example closer to home is the presence of rodents, such as rats and mice, in domestic environments. Human presence has favored an increase in the populations of these small mammals, providing them with food and safe resting places.
However, rodents can live outside of these locations and find their own food.
Examples
Clownfish and anemones
One of the most popular animal interactions is the relationship between small fish in the tropics known as “clownfish” and sea anemones.
Anemones are characterized by a series of sharp tentacles that they use for defense. Anemones can survive without problems in the absence of clownfish, but the fish cannot survive for long without being housed within its symbiotic partner.
Clownfish are unaffected by these stinging structures. These species have adaptations, such as secreting a mucous substance, that allow them to swim freely within the anemone without suffering any harm.
The fish gains protection, as the anemone provides a safe place to stay, while the anemone itself does not benefit from the interaction. Furthermore, the fish can consume leftover prey from the anemone, reducing the energy cost of finding food.
From this perspective, the relationship is a clear example of commensalism. Some authors argue, however, that the anemone is positively affected. This view suggests that the fish provides defense against potential consumers, the anemone.
Epiphytic plants
There are several plants known as "epiphytes," which grow on the branches of other trees. In this interaction, there is no nutritional parasitism; that is, the epiphytic plant does not receive nutrients from the larger tree or plant on which it is hosted.
On the other hand, the benefit you get is clearly "mechanical." The plants are located in a relationship where they can capture more solar radiation (relative to the soil). An increase in light capture translates into an increase in food production for the epiphyte.
Marine crustaceans
Certain species of marine crustaceans grow on other, larger aquatic organisms. They do this to protect themselves, allowing them to move through the ocean and protect themselves from potential predators. Note that the organism carrying them suffers no harm.
remoras
Remoras are a type of fish belonging to the family echeneidae . As in the previous example, one of the most striking characteristics of the group is the behavior of adhering to other larger aquatic animals, such as rays, sharks, sea turtles, among other species.
Remoras have a suction system on the front of their bodies, which allows them to efficiently adhere to the bodies of their larger partners.
The benefit obtained by the remora is not limited to obtaining free movement through the ocean, since the small fish also feeds on the shark's leftovers.
Additionally, the chances of the retrieve being consumed by a predator decrease exponentially if it is attached to a shark's body.
The shark, on the other hand, is not significantly affected by the presence of remora. However, some authors propose that there may be some hydrodynamic disadvantage due to their removal.
Microorganisms and humans
Interspecies relationships also involve organisms we cannot observe with the naked eye. Our digestive system is home to a significant number of commensal microorganisms.
In fact, microorganisms are not restricted to the digestive system. These microscopic inhabitants begin colonizing our bodies at birth, when we pass through the birth canal, where lactobacilli become the predominant inhabitants of the newborn's digestive system.
Subsequently, the environment and food increase our contact with bacteria and other microorganisms, favoring the colonization process.
A significant number of these species will be part of the normal flora of our skin and mucous membranes, establishing a commensalism relationship.
Our bodies provide an ideal environment for their growth, while we remain unaffected. For example, certain bacteria live in our ears and genitals, feeding on secretions from these areas.
However, we often hear that bacterial flora benefits us. On a small scale, each species establishes a commensalistic relationship with our bodies.
However, the sum of all species that are part of the normal flora helps to competitively exclude other microorganisms that may be pathogenic.
Pseudoscorpions
Pseudoscorpions, or false scorpions, are a group of arachnid invertebrates, which morphologically resemble a real scorpion, but are only distant relatives of that group.
These small arachnids have the ability to attach themselves to a wide variety of more mobile arthropods. Among the guests are more than 44 families of insects and three other arachnids.
Furthermore, pseudoscorpions have been found in associations with different mammal species and even bird species.
References
- Bhatnagar, M. & Bansal G. (2010) Wildlife Ecology and Biology. Krishna Prakashan Media.
- Karleskint, G., Turner, R., & Small, J. (2012). Introduction to marine biology. Cengage Learning Alters, S. (2000).Biology: Understanding Life . Jones & Bartlett Learning.
- Kliman, R.M. (2016).Encyclopedia of Evolutionary Biology . Academic press
- Tomera, A. N. (2001).Understanding basic ecological concepts . Walch Publishing.
- VanMeter, K. C., and Hubert, R. J. (2015).Microbiology for the Healthcare Professional - E-Book . Elsevier Health Sciences.