Publisher : Biodiversity Journal
Place of publication :
Publication year : 2018
Thematic : Species
Language : English
Note
The trend of numerosity component of diversity was analysed from palaeontological data,
according to various time intervals and taxonomical ranks. Taxa numerosity of lower (with
respect to family), with a nearly exponential increase, vs. higher ranks (from order to macrotaxon),
with mainly a logarithmic trend, confirms to follow quite different patterns over time.
This dataset seems to fit with a more assortative hypothesis, for higher taxa and a more divisive
one for lower taxa. Then, a model was built to quantify the relative weight, over time, of
the above hypothetical evolutionary components of various taxa ranks; such ranks were identified,
in a palaeontological approach, by the maximum number of recorded taxa or, in a
phyletic approach, by the time duration based on genetic data. The trends obtained by this
model agree with observed records and the hypothesis, to be verified, of a quite different evolutionary
origin of macro- (phylum, class, order ranks) and micro-taxa (genus and species),
during the transition between two main time phases: the first (evidently more assortative),
mainly linked to the lateral sharing of characters, the second (evidently more divisive), mainly
influenced by the ever growing morpho-physio-genetic isolation even for the protection of
complex adaptations, as in the present, “modern speciesâ€.
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Keywords : hawaiian-monk-seal
Encoded by : Pauline Carmel Joy Eje
