E-resources
-
Recknagel, Hans; Kamenos, Nicholas A.; Elmer, Kathryn. R.
Journal of evolutionary biology, July 2021, Volume: 34, Issue: 7Journal Article
It is of fundamental importance for the field of evolutionary biology to understand when and why major evolutionary transitions occur. Live‐bearing young (viviparity) is a major evolutionary change and has evolved from egg‐laying (oviparity) independently in many vertebrate lineages and most abundantly in lizards and snakes. Although contemporary viviparous squamate species generally occupy cold climatic regions across the globe, it is not known whether viviparity evolved as a response to cold climate in the first place. Here, we used available published time‐calibrated squamate phylogenies and parity data on 3,498 taxa. We compared the accumulation of transitions from oviparity to viviparity relative to background diversification and a simulated binary trait. Extracting the date of each transition in the phylogenies and informed by 65 my of global palaeoclimatic data, we tested the nonexclusive hypotheses that viviparity evolved under the following: (a) cold, (b) long‐term stable climatic conditions and (c) with background diversification rate. We show that stable and long‐lasting cold climatic conditions are correlated with transitions to viviparity across squamates. This correlation of parity mode and palaeoclimate is mirrored by background diversification in squamates, and simulations of a binary trait also showed a similar association with palaeoclimate, meaning that trait evolution cannot be separated from squamate lineage diversification. We suggest that parity mode transitions depend on environmental and intrinsic effects and that background diversification rate may be a factor in trait diversification more generally. Frequency of transitions from oviparity to viviparity and palaeoclimate. (a) Empirically estimated transitions from oviparity to viviparity in squamates (dark grey) and the ratio of oxygen isotope (δ18O) as proxy for global mean temperature (light grey) are displayed per million years from 65 million years ago to present. Temperature (y‐axis) and number of transitions (z‐axis) are shown as smoothed lines (spanλ = 0.25).
![loading ... loading ...](themes/default/img/ajax-loading.gif)
Shelf entry
Permalink
- URL:
Impact factor
Access to the JCR database is permitted only to users from Slovenia. Your current IP address is not on the list of IP addresses with access permission, and authentication with the relevant AAI accout is required.
Year | Impact factor | Edition | Category | Classification | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Select the library membership card:
If the library membership card is not in the list,
add a new one.
DRS, in which the journal is indexed
Database name | Field | Year |
---|
Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
---|
Source: Personal bibliographies
and: SICRIS
The material is available in full text. If you wish to order the material anyway, click the Continue button.