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Related Concept Videos

Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
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The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire...
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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...
Synteny and Evolution02:31

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...

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Updated: Jun 5, 2026

Reconstructing Terrestrial Paleoclimate and Paleoecology with Fossil Leaves Using Digital Leaf Physiognomy and Leaf Mass Per Area
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Nothofagus: Evolution from a southern perspective.

R S Hill1

  • 1Robert Hill is at the Dept of Plant Science, University of Tasmania, GPO Box 252C, Hobart, Tasmania 7001, Australia.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Nothofagus evolution and biogeography in the Southern Hemisphere are complex. Recent research on Nothofagus species clarifies fossil evidence for past distribution, origin, and speciation events.

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Area of Science:

  • Paleobotany
  • Evolutionary Biology
  • Biogeography

Background:

  • Nothofagus is crucial for understanding Southern Hemisphere plant evolution.
  • Previous reconstructions of Nothofagus history are abundant but debated.
  • Recent studies on extant and fossil Nothofagus provide new data, complicating its evolutionary relationships.

Purpose of the Study:

  • To reconstruct the evolutionary history and biogeography of Nothofagus.
  • To integrate new fossil and living species data into historical models.
  • To clarify the familial placement and diversification of the Nothofagus genus.

Main Methods:

  • Analysis of extensive fossil Nothofagus records.
  • Comparative studies of living Nothofagus species.
  • Phylogenetic and biogeographical modeling.

Main Results:

  • Fossil evidence strongly supports reconstructions of Nothofagus past distribution.
  • New data present challenges to previously accepted Nothofagus familial relationships.
  • Informed speculation on Nothofagus origins and speciation is now possible.

Conclusions:

  • The fossil record is a robust foundation for understanding Nothofagus biogeography.
  • Further research is needed to resolve Nothofagus phylogenetic complexities.
  • Nothofagus history remains a dynamic area of evolutionary and biogeographical inquiry.