Views on Species Concept

Species is the basic & smallest whit of classification which is represented by binomial nomenclature according to ICBN. Two individuals with maximum similarities which can interbred among themselves & produce fertile individual & also can exchange gene are called Species.

A Species concept is a concept that is the production of each individual judgement. According to John Ray (1886), ” Species are groups of plants which can inbreed within their limits of variation”.

There are several concept about species such as-

  1. Biological Species concept
  2. Typological species concept
  3. Phylogenetic Species concept
  4. Evolutionary species concept
  5. Ecological Species concept

Biological species concept

According to this Concept, a species are groups of actually or partially interbreed populations which are reproductively isolated from other such groups (Moyen 1942).

Species can also be defined from biological species concept as – Species are groups of plants which inbreed within their limits of variation” – John Ray (1686)

Limitations

  • This concept is not applicable for Fossil Species.
  • Reproductive isolation is not applicable in case of vegetatively reproduced Species.
  • This depends on the ability or inability of Sexual equality.

Typological species concept

According to this Concept, species are categorical entities, distinct and somewhat clearly differentiated (Linnaeus). They share certain characteristics that distinguish them from other species.

Phylogenetic species concept

According to this Concept – Species are a group of organisms that shares a common ancestors and can be distinguished from other species by this.

Evolutionary species concepts

According to this concept – Species can be defined as a single lineage of ancestral descendent population of organisms which maintain its own identity from other such lineages and which has its own evolutionary tendencies and historical fate.

Ecological species concept

Considers a Species to be a lineage which occupies an adaptive zone minimally different from that of any other lineages in its range and which evolved separately from all other lineages outside of its range.

 


Revised by 

  1. Md. Siddiq Hasan on August 7, 2020

0 0 vote
Article Rating

About Abulais Shomrat

Abulais Shomrat
Currently in 4th year (Hons) in Department of Botany, University of Dhaka. Planning to have multiple careers one by one but promised to be with 'Plantlet' as long as it's primary stage remains unfinished.

Check Also

Taxonomy: DNA Barcoding

DNA Barcoding DNA barcoding is a method of species identification using a short section of …

Subscribe
Notify of
guest
0 Comments
Inline Feedbacks
View all comments
0
Would love your thoughts, please comment.x
()
x