from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An evolutionary process that involves the splitting off or branching of new taxa from an ancestral form.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An
evolutionary splitting eventin which each branchand its smaller branches forms a clade.
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
Usually, this pattern is attributed to cladogenesis compressed in time, combined with the inevitable erosion of the phylogenetic signal.
At the early stages of cladogenesis, it can be almost impossible to determine if a particular lineage represents an new species.
The results of this paper are difficult to reconcile with the case for cladogenesis in the Homo lineage during the Pleistocene.
The answer is that “species” is a term that applies when cladogenesis occurs which we may or may not be able to identify, no matter what the “level of organisation” or whatever.
Note the cladogenesis: microwave ovens, radar, vacuum tubes, and photomultipliers all still exist today. steve s
Ree, RH, Smith SA (2008) Maximum likelihood inference of geographic range evolution by dispersal, local extinction, and cladogenesis.
Phillimore AB, Price TD (2008) Density-dependent cladogenesis in birds.
Darwin then used this data as evidence that rates of cladogenesis are autocorrelated between ancestral and descendent branches within the evolutionary tree (and, by extension, he used his data as evidence against special creation).
Either way, the pattern that we describe here suggests that bird subspecies may be regarded as units in the process of either cladogenesis or of phenotypic divergence.
These "manufactories" are analogous to more recent metaphors such as "Adam and Eve" lineages - all are sources of ongoing cladogenesis