Species is the rudimentary unit of classification in biology and biodiversity. Spices are often defined as a large section of organism where two individuals of the opposite sexes produce fertile offspring. Moreover, types of species are identified and differentiated via their karyotype, morphology, ecological niche and their DNA sequences.
What is Species in Biology?
Species definition in Biology indicates that it is a group of organisms that share a common genetic heritage. Moreover, they are competent to interbreed and produce fertile offspring in the process.
However, species are separated from each other via different barriers. These barriers can be genetic or geographical.
Types of Species
There are different types of species that exist on this earth. However, they are broadly categorised into six concepts; these are –
1. Biological Species Concept
In 1940, zoologist Mayr presented a widely accepted quotation of biological concepts. It was, “groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups”.
This theory explains that organisms distinct at a biological level do not interbreed with each other when budding in the same region. According to Mayr, species of these groups has specific characteristics, these are –
Even though the members of a species are different from each other, they form a group together. They interact with other members of the species in any environment.
The members form a reproductive community and seek a partner within that group for reproduction.
A substantial intercommunicating gene pool exists with this group, allowing members to freely interbred. However, the individual elements are a temporary vessel containing a small portion of that gene pool.
This theory has gained reputation among scientists for years due to its simplicity. However, there are certain limitations of biological species concept, these are –
Asexual organisms do not come under this theory. Apomictic or asexual organisms display uniparental reproduction via apomixes, parthenogenesis, budding, etc.
Additionally, this theory is also not applicable for geographically isolated species (allopatric population).
2. Nominalistic Species Concept
This concept deals with the idea of individuals. The promoters of this theory believed that in nature, only individuals exist, and not any types of species. According to them, the concept of species is human-made and has no real existence in nature.
Moreover, they regarded it as a mental concept. This concept was popular during the 18th century and still has some followers in the world of botany.
3. Typological Species Concept
According to this concept, several diversities exist on earth, but in limited variations. Moreover, they do not have any relationship between them. In this concept, these universals are called species. However, it is irrelevant to consider variations in this topic.
4. Evolutionary Species Concept
To describe this species concept, Wiley in 1981 said evolutionary species “is a single lineage of ancestor-descendant populations of organisms which maintains its identity from other such lineages [in space and time] and which has its evolutionary tendencies and historical fate”.
Moreover, to include the species not considered under the biological species concept, this process was formed.
5. Ecological Species Concept
This concept studies ecological competition in an ecosystem. In simpler words, two similar categories of species have the same requirements; thus, their needs are likely to overlap. In a situation like this, they compete with each other for a particular resource.
6. Phylogenetic Species Concept
This concept classifies species in a particular group according to its ancestors. It claims that every individual within a species shares a certain resemblance with its lineage. However, this concept has a flaw. It is not easy to reconstruct an evolutionary pathway, even if so, it is not satisfactory all the time.
These classifications of various types of species rely on different theories developed over time. Similarly, like other theories, they have their flaws. Students can use the Vedantu app to access other methods of biology as well as other topics of the subject.
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1. What is Meant by Species?
Ans. Species is the elementary unit of taxonomy in biology and biodiversity. Species are a significant segment of organisms where two individuals of the opposite sexes produce fertile offspring.
2. Who Coined the Term “Biology”?
Ans. The term biology first-appeared in the works of Swedish scientist Carl Linnaeus in 1736. It appeared in his Bibliotheca Botanica.
3. What is the Definition of Species in Biology?
Ans. Species in Biology means a group of organisms, which share a genetic heritage. Moreover, they are capable of interbreeding and producing fertile offspring. However, species are parted from each other through different barriers. These barriers can be genetic or geographical.