Congratulations, Nick Sakich, MSc!

In a first for the lab, we just held a completely online MSc defence. Valiantly, Nick defended his MSc with grace, precision, insight, humour, and interesting anecdotes.

His thesis is entitled: “The Physiological and Behavioural Consequences of Reduced Scalation in Captive-bred Phenotypes of the Bearded Dragon (Pogona vitticeps Ahl 1926)“.

Here he is giving his presentation (sorry for the screen cap, Nick)

speaking about one of our favourite study animals:

The 3 phenotypes of captive-bred Pogona vitticeps studied in Nick’s thesis. a) wildtype, b) leatherback, and c) silkback.

Many thanks to the examining committee:

External Examiner, Dr. Chris Oufiero, Towson University
Chair, Dr. Cheryl McCormick
Committee Member, Dr. Jeff Stuart
Committee Member, Dr. Robert Carlone
Supervisor, Dr. Glenn Tattersall

Virtual congratulations to Nick are insufficient expression of gratitude for his hard work and devotion to his research. When and if we can safely congregate in small groups, we will celebrate appropriately! I really owe Nick my thanks for joining my lab. He has helped educate me through his efforts. It cannot be fun wrapping up one’s MSc during a pandemic, and Nick did a brilliant job.

A few highlights from Nick’s presentation below.

Thanks as well to A&A Dragons for their support over the years.

Avian Thermal Biology Visitor

The lab will be hosting a PhD student from Spain for the next 3 months.

Núria Playà Montmany from the University of Extremadura has just arrived (I’m a few days late, she arrived in late January!). I met Núria last summer defending her poster at the SEB meeting in Sevilla. She will be becoming a thermal imaging expert while she is here!

With overlapping interests in avian physiology and the lab’s interests in thermal biology and studying animal responses to climate change, we hope to have a productive visit. Here is a link to Núria’s blog:

https://birdsfacingclimatechange.wordpress.com/author/nuriaplaya/

Welcome to the lab, Núria! Let’s hope you have a good few months working with us.

Problems with assumptions in macroecology

Thanks to some very kind and smart colleagues, we have an editorial published in Ecology and Evolution!

https://onlinelibrary.wiley.com/doi/full/10.1002/ece3.5721

Here is the citation:

Justin G. Boyles, Danielle L. Levesque, Julia Nowack, Michał S. Wojciechowski, Clare Stawski, Andrea Fuller, Ben Smit, and Glenn J. Tattersall 2019. An oversimplification of physiological principles leads to flawed macroecological analyses. https://doi.org/10.1002/ece3.5721

Take home message? Few endotherms are homeothermic, so they do not conform to assumptions of the Scholander-Irving model. Taking predictions from the SI model based on a broad range of lab studies can lead to huge errors in predictions. A re-assessment of macroecological predictions using this approach is warranted.

Demonstration of the inherent limitations of using body temperature (Tb) and the lower critical temperature (Tlc) of the thermal neutral zone to calculate thermal conductance (C) when Tb and Tlc are poorly defined.

Bridgeman now the Master

When he left the lab to write up his thesis, he was but the learner…now, HE is the Master.

Congratulations, Justin Bridgeman for a successful defence! Justin’s thesis earlier today was on “Behavioural thermoregulation and escape behaviour in the round goby”.

Thanks to the selfless efforts of the committee members (Dr. Gaynor Spencer, Dr. Liette Vasseur, and Dr. Patricia Wright), external examiner (Dr. Dennis Higgs, U Windsor), and committee chair (Dr. Cheryl McCormick).

Thank to all the lab mates for supporting Justin and welcoming him back for his brief visit.

All the best in the future Justin! We look forward to the manuscripts…and for a place to crash when we visit you in Halifax! 😉

Toucans of the atlantic

Earlier this summer, I was lucky enough to visit the Isle of May, Scotland to fulfill a long-time ambition to collect thermal image data on puffins in the wild. Ever since we published our work on the toucan in 2009, I have wanted to study the puffins, examining evidence for elevated capacity to control or distribute body heat through their uniquely colourful bill. Living in a cool climate with a large radiator like their bill presents a unique opportunity to test our hypotheses. In spring of 2018 I managed to visit the Elliston, Newfoundland puffin colony to start this project, but the distance to view a little too far to obtain high quality results.

Well, the short story is that they do show an extraordinary capacity to do so! Here is just a sample image (from the 200 Gb of videos):

Active and basking Atlantic puffins show capacity for intense heat transfer to the bill. The one above has recently landed back at the colony, presumably foraging although in this case, there is no evidence of food. Other images show cool bills, as we have seen in many other bird species, demonstrating the vasomotor control over blood flow to the bill is a fairly generalised phenomenon.
Infrared thermal video of an Atlantic puffin in May 2018 – early arrival at nest and investigating burrows.
Atlantic puffin in the rain.

If I only had the time to conduct the data analysis, I could put some numbers on these values. I certainly have my work cut out for me, examining those returning from the water with food vs. those basking and resting. I have a few other thoughts about these data that I hope to extract.

Many thanks must go to the town of Elliston, Newfoundland and the Atlantic puffin colony there, the Centre for Ecology and Hydrology (UK), the Isle of May (Scotland) Scientists, and especially Mark Newell for hosting me at the Isle of May, and Mike Harris for introducing us. Sorry it took so long to post this.

Further Reading

Tattersall, GJ, Arnaout, B, and Symonds, MRE.  2017.  The evolution of the avian bill as a thermoregulatory organ. Biological Reviews 92: 1630-1656. doi:10.1111/brv.12299

Greenberg, R, Cadena, V, Danner, RM, and Tattersall GJ. 2012. Heat loss may explain bill size differences between birds occupying different habitats. PLoS One, 7: e40933. 

Symonds, MRE and Tattersall, GJ. 2010. Geographical variation in bill size across bird species provides evidence for Allen’s rule.American Naturalist. 176: 188-197.

Tattersall, GJ, Andrade, DV, and Abe, AS. 2009. Heat exchange from the toucan bill reveals a controllable vascular thermal radiator.Science, 325: 468-470.

Backyard Biology

Earlier this year, I put a raspberry pi on a robin nest in my backyard. Used it as an opportunity to test out tweet streaming from my twitter account, so am posting the link here to the lab blog. Sorry it took so long, I was away from stable internet access for the past month.

Insect thermogenesis

A luna moth was on our window outside the department yesterday.

So, we brought it inside for a lab show and tell. Shivering up a storm….

Thorax temperature up to 32C, while the abdomen temperature was still below 20C (the lab was ~21C, and the moth had been briefly placed in a cold fridge).

CSZ 2019

Another year passes and another good Canadian Society of Zoologists meeting.

Here is Nick Sakich presenting his first scientific poster. Well done Nick! Nick had a lot of attention at his poster. Maybe we can get Nick to come to CSZ next year!

And here is a rogue’s gallery of happy scientists congratulating Cayleih Robertson (second from right) for winning the Hoar Award for the best student presentation at the CSZ! Cayleih is studying her PhD in Dr. Grant McClelland’s (left) lab, conducted her MSc with Dr. Patricia Wright (second from left), and her undergraduate thesis with Dr. Suzie Currie (middle). I (far right) have the distinct privilege of being on the receiving end of Cayleih’s collaborative nature, in that she has involved my lab with a portion of her PhD (thus, why I’m in the picture!). Full credit has to go to Cayleih for her spirit of inclusivity, scientific curiosity, and intelligence. And of course, she gave a great talk! Congratulations, Cayleih!