CALL is pleased to announce the relaunch of their popular Science and Environment Lecture Series, beginning in January. We will be using the Zoom Webinar format which allows for larger numbers of attendees and a more orderly presentation format. A Q&A feature in the Webinar platform allows for the audience to ask questions of the speaker at the end of the presentation. The sessions will be held at 7:30 PM on the first Tuesday of the month, as was the custom pre-Covid.
To contact us, please email Science & Environment Team
Fighting in Tyrannosaurs: Evidence from scars on bones
Abstract: Tyrannosaurs were the largest predators in dinosaur dominated ecosystems across North America and Asia during the Late Cretaceous. Due in part to their size and geographic/temporal occurrence, tyrannosaurs have one of the best fossil records of theropod dinosaurs. An intriguing aspect of these fossils is the common occurrence of healed (or partially healed) bone scars, caused by tooth marks, preserved on their skulls. Multiple lines of evidence, including embedded teeth, suggest these bites were inflicted by other tyrannosaurs, likely members of the same species.
This talk is a “what we know, and how we know it” approach, documenting the occurrence, frequency, and morphology of these bite marks through a growth series, and across multiple tyrannosaur species. This preserved behavioural evidence helps to reconstruct aspects of intraspecific aggressive behaviour in tyrannosaurs, and across a broader sample of theropod dinosaurs.
Bio: Dr. Caleb Brown, PhD. Caleb is originally from northern British Columbia, but grew up in Red Deer, Alberta. Growing up in Central Alberta, Caleb was exposed to Alberta’s fossil history at a young age and never turned back. After completing his BSc and MSc at the University of Calgary, focused on Dinosaurs, Caleb moved to Ontario to pursue a PhD in the Department of Ecology and Evolutionary Biology at the University of Toronto. For his dissertation, he studied the variation and evolutionary morphology in horned dinosaurs from Dinosaur Provincial Park. He returned to Alberta in 2019 to become the Curator of Dinosaur Systematics and Evolution at the Tyrell museum in Drumheller.
Caleb’s research interests focus primarily on the palaeobiology and evolution of dinosaurs, particularly ornithischians, concentrating on the growth and evolution of "cranial ornaments". He also has a strong interest in taphonomy, specifically the role of depositional environments in shaping our understanding of ancient ecosystems. Over the years, Caleb has conducted fieldwork in Alberta, Saskatchewan, the Northwest Territories, China, and Mongolia.
Greenhouse Gases from Ruminant Livestock
It is estimated that approximately 3.6% of Canada’s total greenhouse gas (GHG) emissions are due to enteric fermentation in domestic livestock. A research program initiated in the early 2000s by Dr. Beauchemin and her colleagues at Agriculture and Agri-Food Canada has established methods to measure these emissions from cattle. The goal has been to develop strategies to reduce the enteric methane that is produced by cattle as a byproduct of digesting fiber. This research is leading to novel nutritional approaches that improve air quality and lessen the environmental footprint of the livestock sector. In addition to curbing GHG emissions, reducing methane produced during feed digestion improves the efficiency by which dairy cows and beef cattle convert plant material into food (milk and meat) for people.
Speaker: Karen Beauchemin
Dr. Karen Beauchemin , an honorary research affiliate with Agriculture and Agri-Food Canada, is recognized as an international authority on methane emissions and cattle nutrition. Her research has led to the development of farming techniques that improve how we raise cattle for meat and milk, while reducing the environmental impacts of livestock production. Dr. Beauchemin has been widely recognized for her work with innumerable awards, including being honoured as 2022’s Woman of Impact in Science, Technology, Engineering and Mathematics, by the Government of Canada.