Today a study was published in the journal Copeia detailing how lizards at the cool northern edge of their range energetically manage in an excessively cool climate. The results of this study could provide useful information regarding lizard range shifts resulting from climate change. Lead author of the study was Sean Powers (yes, a Powers lab progeny) who is currently a Ph.D, student at Virginia Commonwealth University. Click here to download the paper.
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The Powers lab collected data on hummingbirds for nearly a month at the Southwestern Research Station (SWRS) from the latter part of May to late June. Collectively we gathered data on nighttime body temperature management, daytime body mass management, and evaporative heat dissipation during hovering. Collaborator Anusha Shankar (Stony Brook University) and Sarah arrived two weeks before the rest of us to finish up measurements showing use of shallow torpor by hummingbirds. Once Don and Natalie arrived measurements of daytime body mass management and evaporative heat dissipation began. While the evaporation measurements were less successful than we hoped, we still ended our time at SWRS with tons of good data.
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Don Powers and Natalie Amodei traveled to Missoula, MT for the lab’s annual trip to work with Dr. Bret Tobalske. Over the years this has been a fruitful collaboration resulting in several publications relating to hummingbird physiology and biomechanics. This year we continued efforts to gather measurements of total evaporative heat dissipation in hovering calliope hummingbirds (Selasphorus calliope) before hopefully expanding these measurements to other species in Arizona next month.
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Congratulations to the Powers Lab’s own Natalie Amodei who was awarded a Sigma Xi Grant-in-Aid-of-Research for her proposal entitled “Can hummingbirds upregulate evaporative heat dissipation during hovering to compensate for loss of passive heat transfer at high temperatures?” Natalie will use the grant to help fund her research in Arizona this summer.
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Today the Royal Society Proceedings B published a study on hovering metabolic rate allometry and efficiency in hummingbirds that was done in collaboration with the Powers Lab. lead author on the study was Dr. Derrick Groom, who at the time was a graduate student in the laboratory of Dr. Ken Welch. Full text of the paper can be found at:
https://royalsocietypublishing.org/doi/10.1098/rspb.2017.2011
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Nature Science AJP – Regulatory, Integrative and Comparative Physiology
