terça-feira, 14 de abril de 2020

Main article text

 

Introduction

  1. First mosasauroids diversified following competition with plesiosaurs.
  2. At least some mosasauroids competed with contemporary plesiosaurs or seized the opportunity and occupied their niches when they were in demise or became extinct.
  3. The fates of plesiosaurs and mosasauroids were independent of each other (no suggested competitive interactions between mosasauroids and plesiosaurs).

Methods

Bayesian inference

Reconstruction of geographic origin

Results

Rates of morphological evolution

Bayesian analysis of plesiosaur phylogenetic relationships

  1. In the present study, the age uncertainty of each taxon is incorporated in the analysis: age prior of all fossil taxa is defined as a uniform range including the absolute age limits of the shortest stratigraphic range unambiguously including any taxon. This approach differs from that followed in Cau & Fanti (2016), who used for each tip a fixed age prior defined arbitrarily by the mean value of the stratigraphic uncertainty of each taxon.
  2. The tree model used here discriminates between anagenetic and cladogenetic patterns of evolution; therefore, it may test whether some of the taxonomic units that are included actually form anagenetic sequences. The analysis in Cau & Fanti (2016) was run on a previous version of BEAST which did not implement the Sampled Ancestor Fossilized Birth Death Skyline Model (Gavryushkina et al., 2014), and thus was a priori constrained to reconstruct exclusively cladogenetic frameworks.

Discussion

Estimates of evolutionary rates and potential biases

The impact of phylogenetic uncertainties on inferences of evolutionary rates

Sampling bias

Comparing mosasauroid and plesiosaur traits

Tooth crown morphologies and trophic guilds

Body size evolution

Evolution of swimming abilities

Thermoregulation and metabolic rates

Reproduction and early life history

The record of interactions between mosasauroids and plesiosaurs

Concluding remarks

  1. First mosasauroids diversified following competition with plesiosaurs.
  2. At least some mosasauroids competed with contemporary plesiosaurs or seized the opportunity and occupied their niches when they were in demise or became extinct.
  3. The fates of plesiosaurs and mosasauroids were independent of each other (no suggested competitive interactions between mosasauroids and plesiosaurs).

Supplemental Information

Mosasauroid and plesiosaur FADs and LADs and the geographic distribution

DOI: 10.7717/peerj.8941/supp-1

BEAST file for the Bayesian analysis of Mosasauroidea

DOI: 10.7717/peerj.8941/supp-2

NEXUS file with the dataset of Mosasauroidea

DOI: 10.7717/peerj.8941/supp-3

Character list for the phylogenetic analyses of Mosasauroidea

DOI: 10.7717/peerj.8941/supp-4

BEAST file for the Bayesian analysis of Plesiosauria

DOI: 10.7717/peerj.8941/supp-5

NEXUS file with the dataset of Plesiosauria

DOI: 10.7717/peerj.8941/supp-6

Character list for the phylogenetic analyses of Plesiosauria

DOI: 10.7717/peerj.8941/supp-7

Maximum Clade Credibility Tree (MCCT) of Plesiosauria

Full phylogenetic tree.
DOI: 10.7717/peerj.8941/supp-8

Log files from the Bayesian analyses of Mosasauroidea and Plesiosauria

DOI: 10.7717/peerj.8941/supp-9

Additional Information and Declarations

Competing Interests

The authors declare there are no competing interests.

Author Contributions

Daniel Madzia and Andrea Cau conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the paper, and approved the final draft.

Data Availability

The following information was supplied regarding data availability:
The data matrices used for Bayesian analyses and resulting log files are available in the Supplemental Files.

Funding

The study was funded by the National Science Centre (Poland) grant no. 2015/19/N/ST10/01628 to Daniel Madzia (Institute of Paleobiology, Polish Academy of Sciences). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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