An ecosystem can be described as all the interactions that occur between organisms and their physical environment. The processes acting within an ecosystem operate on a wide range of spatial and temporal scales and include both biotic and abiotic factors. Ecosystem engineers are those species that have a significant impact on the availability of resources to other species and can be responsible for the creation, maintenance, modification or destruction of an ecosystem. The introduction, or even removal, of such a species can have profound effects on both physical and biological elements of an ecosystem. Whilst we can recognise the impact of ecosystem engineers in modern systems (e.g. the introduction of an invasive species), we don’t fully understand what happens when an entirely new ecosystem engineering behaviour evolves. This has undoubtedly happened numerous times throughout geological time with the Great Oxygenation Event and the Cambrian Substrate Revolution being notable examples. Joining us for this episode is Dr Tom Smith, University of Oxford, who has been using a computational approach to try to model what happens when an ecosystem engineer is introduced into an environment. The open access study is available to read here.
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Episode 162: Cerney Wick
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Episode 161: Notosuchians
Found in the fossil record between the Jurassic and the middle Miocene, Notosuchia was a highly diverse and strange group of crocodylomorphs, most notable for their terrestrial lifestyle. Joining us for today’s episode is Dr Yohan Pochat-Cottilloux from the Laboratoire de Géologie de Lyon, who specialises in the study of crocodylomorphs. Together, we will explore the wide range of scientific methodologies that have so far been used to study the lives of these strange reptiles and discuss how they may have looked and behaved.
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Episode 160: An introduction to Evolutionary Biology
The field of evolutionary biology has been greatly influenced by the development of modern genetic methodology. The understanding of genes, genomes and the molecular mechanisms key to life on Earth are all goals of evolutionary biology in the 21st century, yet its potential applications seem to be near limitless. Palaeontology and evolutionary biology continue to be closely related and both, with their deeply rooted origins, have been essential to our understanding of macroevolution (major evolutionary change over long periods of time) ever since the major development of the theory in the 19th century. In this episode, Prof. Erica Bree Rosenblum introduces us to this diverse and constantly evolving field. We cover fundamental questions such as: what are genes and genomes and why does understanding them matter; which evolutionary roles do environmental and genetic mechanisms play; and what ultimately causes the rise and fall of species. In order to better understand life on Earth, we show how evolutionary biology brings together the fields of genetics, biochemistry, ecology, palaeontology and more.
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Episode 159: An Introduction to Palaeontology
In 12 years of podcasting, we have never actually taken the time to address the fundamentals of our field. Such questions could include: what is palaeontology, what is a fossil, how does one become a palaeontologist, and why is palaeontology important? For what should have been our very first episode, we've invited Prof. Roy Plotnick, University of Illinois Chicago, to help us outline everything you need to know about the field of palaeontology. Roy has had a long and varied palaeontological career, he maintains a blog all about the field, and he is author of the book Explorers of Deep Time.
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