Chronospecies

am sorry for any inconvenience, but this page is still in preparation. At present, it is no more than an extensive collection of putatively relevant literature and first fragmented ideas…


When populations of one and the same species evolve independently from each other for a longer period of time, they are inevitably going to differentiate. This is a gradual and continuous process. But at which point should divergent populations be considered separate species? The answer to this question is still a matter of debate…

 

Correlation between “Theoretical species concepts” and “Operational species delimitation criteria”

Phylogeography, speciation, species delimitation. species limits,

Genetic divergence versus morphological, plumage or song differentiation, 

Genetic differentiation (divergence, distance) should be translated to divergence time…

comparing a small number of specific DNA sequences (or ‘markers’) was not informative for distinguishing (delimiting) taxa.

Biodiversity conservation has historically focused on species; however, how species are conceptualised and delimitated are topics which continue to be


Due to evolutionary processes like incomplete lineage sorting and introgression through hybridization, several independent DNA markers are essential to resolve closely related species.


Biological species concept - the foundation of integrative taxonomy

initial empirical investigation/determination of reliable species boundaries provide the basis for subsequent a posteriori taxonomic generalisations of reliable species-divergence thresholds 

Since a comparison of a multitude of independent integrative taxonomic studies resulted in largely concordant results, the data obtained should be taken as a framework allowing general conclusions to be drawn. 

Identification, delimitation, definition

DNA sequence-based species delimitation

Divergence events between either species- or subspecies-level taxa demand thresholds to be definede to be able to distinguish between them. 

Reproductive isolation is a by-product of genetic differentiating following prolonged spatial separation (isolation). 


Chronospecies

Guided by the idea that DNA should be informative at all taxonomic levels, I conclude that the delimitation of species and subspecies should also be based on differences in DNA sequences (as discussed in Jarvis, 2016 and recommended for allopatric species by Price, 2008 and Hudson & Price, 2014). This pragmatic approach is based on the widely accepted assumption that the speciation process represents a continuum that can only be arbitrarily divided. It ultimately follows that species cannot be detected but have to be defined. Originally established in palaeontology (Stanley, 1978), I expand the meaning of the term “chronospecies” by applying it to the DNA-based species concept to be outlined below. 

Selecting an appropriate threshold of sequence divergence for species delimitation, and thus cannot be criticised for not taking into account evolutionary processes. 

First, differences in the DNA signature of independent lineages need to be quantified. Next, the observed differences need be translated into divergence times. Finally, the putative divergence times are used to delimit species and subspecies according to the putative times of divergence. Species status might be attributed to lineages that are at least two million years old (following Price, 2008; and Hudson & Price, 2014), and subspecies status to lineages that are at least one million years old ( new suggestion). 

Age should be the sole operating criterion in defining species and subspecies. At present, however, avian taxonomists integrate everything - except time. Other traits (morphology, acoustics, behaviour, habitat preference, distribution, and possibly others) are still required to investigate the underlying evolutionary processes of speciation. 

Relying exclusively on age substantially reduces the level of subjectivity in species-delimitation decisions. Once delimiting ages for species and subspecies are agreed upon, species-level taxonomies could be generated automatically by computer programs. 

When considering closely related populations of organisms, it can be difficult to decide where to draw the line between species and subspecies. The problem is exacerbated by the fact that many distinct species inter-breed to some extent, blurring the lines between species and subspecies further.  


References/Literature

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