Darwin Day 2014
The Evolving Tree of Life
Thursday 20 February at 18:00. Egget, Studentsenteret.
The lectures are intended for a wide audience, will be held in English, and are part of the
Horizons seminar series
of the Faculty of Science. Light snacks will be served from 18:00; talks begin 18:15.
The evolutionary relationship between species on Earth is often depicted as a branching tree.
This illustrates the single origin of life, and how new species have evolved into existence
at every branching point. But nobody was present to observe which relatives a species
actually had when it arose.
Instead, zoologists and botanists have grouped species according to anatomical and physiological
resemblance, based on the assumption that species that appear similar also are highly related.
Over the last couple of decades, our ability to read and understand the genetic sequence has
improved dramatically, and in our genes a different story is sometimes written. As we speak,
entire branches of the Tree of Life are changing place. Join us on archeological excavations in the genomes!
A tree from Darwin's notebooks.
New views on animal evolution
The animal part of the Tree of Life has changed dramatically since molecular biology was introduced to the research field about 25 years ago. Molecular disciplines, such as evolutionary developmental biology (EvoDevo) and phylogenomics (DNA sequences from entire genomes), have provided convincing data that puts the branches in new positions. Major animal groups that share a similar anatomy and were thought to be closely related have been split up and moved further apart, while controversial new groups have emerged as new branches. Although the new tree is widely accepted, it has proven challenging to explain how anatomy has evolved in parallel with new branches. This will be illustrated with examples in the talk. Further, the basal part of the tree, which includes sponges, jellyfishes, corals, and comb jellies, is still highly debated, and brand new (and controversial) molecular data suggests that we, once more, might have to revise our view on the evolution of animals.
Unravelling the evolutionary kinships of animal diversity
We encounter an amazing animal diversity on this planet. Fascinated by animal documentaries that show behaviour of animals and illustrate recent explorations of the ocean abyss we enjoy this diversity and its beauty. Over 150 years after Darwin's publication of The origin of species researchers are still investigating how diversity on this planet has evolved. Modern technology of DNA sequencing and advances in computational biology allows us to draw a clearer and more detailed picture about how these animals are related to each other and thus allow to trace back the evolution of major organ systems including our brain, digestive tract, and musculature. The findings of these efforts have led to many surprises and unexpected findings. Often against our intuition that everything went from simple to complex, the results sometimes indicate the contrary. However, the research is still ongoing and many questions remain and are hotly debated. I will explain the modern methods used to unravel animal relationships, introduce some of the recent findings and what they mean for our understanding of complexity in general and for the evolution of our own organ systems.
About the Presenters
is group leader at the
Sars International Centre for Marine Molecular Biology
University of Bergen.
Together with colleagues he analyses similarities of the genetic sequence and compares embryological development among animal groups to improve our understanding of the evolutionary relationships among them.
is professor of marine zoology and group leader for the research group in
Department of Biology,
University of Bergen.
Glenner shares with Darwin a passionate fondness of barnacles. Glenenr also does resarch on other crustaceans, with emphasis on their life cycles and phylogenetic relationships. Initially trained in classical morphology, he now regularly involves multple scientific disciplines to address his research questions.
Why is the Darwin Day celebrated?
Who is behind the Darwin Day in Bergen?
The Darwin Day 2013 in Oslo