biological species


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Related to biological species: phylogenetic species

biological species

groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups. Recently the biological species concept (BSC) has been criticized by the proponents of the PHYLOGENETIC SPECIES concept (PSC) particularly on the basis that:
  1. It does not rely on rigorous analysis of taxonomically valid characters but on an inferred speciation process.
  2. That the process of reproductive isolation is usually untestable, giving rise to necessary assumptions concerning reproductive isolation.
  3. POLYTYPIC species are not single evolutionary units.

However, the PSC presents even more problems and again, in the long run, depends on the opinions of the taxonomist. Disagreements amongst taxonomists concerning subspecies under the BSC would translate to a much more difficult situation of species under PSC, and its supporters include those apparently intent on increasing the overall number of species - more than doubling the number of bird species for example. However the number of species recognized is not a factor in the argument. Speciation is an ongoing process and inevitably the point at which a population ceases to breed freely with other populations (thus making the species the only natural taxonomic unit) is difficult to recognize and this gives rise to controversy. At the present time a good case has not been made out to dispense with the biological species.

References in periodicals archive ?
In the classical models, the two subspecies that act as biological species would be the most genetically distant despite their physical proximity due to historical isolation.
Here again, Wheeler gestures toward the argument that morality and affect cross biological species lines.
Ecological systems are extremely complex networks, consisting of many biological species that interact in many different ways, such as mutualism, competition, parasitism and predator-prey relationships.
The natural ecosystems of Pakistan that support biological species have been not only the source of subsistence of dependent communities but also play an indispensable role in the national economy and ecological integrity.
Subsequently Robbins reviewed "Lamasina" inviting Gerardo Lamas, the greatest cataloguer and nomenclatorist of Neotropical butterflies, and tried to annihilate my results flagging the biological species concept (ROBBINS & LAMAS 2008a).
Humans, as a biological species, are dependent on nature for a supply of oxygen for respiration and other forms of sustenance such as food and health, which depend on biological cycles and processes of the natural system.
Second, computer technology has advanced at breathtaking speed, especially for the kind of information connectivity that classifying biological species demands.
Of course 'influence' plays a role, but more than that it is the interplay of many architectural species waxing and waning with some individuals jumping across bloodlines (unlike biological species cultural ones can learn tricks from anywhere).
According to the biological species concept, are the Eloi and Morlocks different species?
75) The biological species concept, which defines a species as a naturally interbreeding group of organisms, faces the blurred boundary of hybridization and asexual reproduction.
3:00 BIOLOGICAL SPECIES CONCEPTS: PHILOSOPHICAL AND BIOLOGICAL APPROACHES
The lack of evidence for characterizing organic evolution as continuation of inorganic evolution and failure of attempts to synthesize life in the laboratory from chemicals strongly suggest the need for a new direction to the scientific pursuits towards understanding life and origin of biological species, especially in view of the changing concept of gene and growing natural evidence against the foundations of Darwinism or synthetic theory.