IDENTIFICATION OF UBIQUITINATION SITES ON MEMBRANE-ASSOCIATED PROTEINS IN ARABIDOPSIS
Protein phosphorylation and ubiquitination are two of the most commonly studied post-translational modifications of proteins in eukaryotes. While previous studies have recorded several ubiquitinated proteins in plants, few ubiquitinated membrane-localized proteins have been identified.
In a recent study, Queen’s Biology Assistant Professor Dr. Jacqueline Monaghan, former Queen’s Biology MSc students Katherine Dunning and Lauren Grubb, and collaborators, describe the large-scale identification of ubiquitination sites on Arabidopsis (Arabidopsis thaliana) proteins associated with or integral to the plasma membrane, including over 100 protein kinases.
The researchers’ work is an important contribution to plant molecular biology, cataloguing hundreds of in vivoubiquitination sites on plasma membrane proteins. To learn more, read their article in Plant Physiology.
This research is co-authored by Paul Derbyshire, Cyril Zipfel, and Frank L.H. Menke (University of East Anglia, Norwich, United Kingdom).
BIK1 (a receptor-like protein kinase) is ubiquitinated on multiple surface-exposed lysines in vivo.
INVESTIGATING TRANSCRIPTIONAL RESPONSES IN PLANT-RHIZOBIA SYMBIOSES
As the global demand for food production rises, a deep understanding of our crops – and their microbiomes – becomes essential. A plant’s microbiome includes a diverse suite of microbial species that are crucial in maintaining plant health through improved plant nutrition and function, pest tolerance, and even responses to changing climate.
Rhizobia-legume symbioses are ecologically and agronomically important. Rhizobia are a group of soil bacteria that fix nitrogen for plants. In nature, the association of rhizobial strains and host plants are highly variable, even within the same species. Because of this, the genetic makeup required for efficient rhizobia-legume associations is still poorly understood.
In a recent study, Queen’s Biology Assistant Professor Dr. George diCenzo and PhD Candidate Rui Huang, with collaborators from the University of Florence (Florence, Italy), used RNA sequencing to determine the RNA transcripts of multiple rhizobial strains in the presence of root secreted compounds produced by three alfalfa varieties.
Results from this study demonstrated that transcriptional responses of rhizobia associated with alfalfa are influenced by the genotypes of both symbiotic partners and their interaction, suggesting high variability in the genetic determinants involved in phenotypic variation of plant-rhizobium symbiosis. The researchers’ work provides genetic insights into natural rhizobium variation that could potentially improve legume growth in agricultural systems. To learn more, read their article in mSystems, published by the American Society for Microbiology.
This research is co-authored by Camilla Fagorzi, Giovanni Bacci, Lisa Cangioli, Alice Checcucci, Margherita Fini, Elena Perrin, Chiara Natali, and Alessio Mengoni.
Rhizobium – legume symbioses. (Left) This photo shows 28-day old alfalfa (Medicago sativa) plants grown in a vermiculite – sand mixture with a nutrient solution lacking nitrogen. The pots on the left contain the rhizobium Sinorhizobium meliloti, whereas the plants on the right did not. The drastic difference in growth provides a nice visual depiction of the value of the symbiosis to the plant. (Top right) A picture of the roots of alfalfa, showing pink nodules, which are the plant organs that house rhizobia. The tips of the nodules appear white, as this region represents a different developmental zone than the pink section of the nodules. (Bottom right) A confocal microscopy image of a nodule containing nitrogen-fixing rhizobia. The image is centered on a single plant cell from the nodule that is packed full of rhizobia (the green, elongated structures).
SEABIRD POPULATION DECLINE FOLLOWING EUROPEAN SETTLEMENT
Seabirds are important indicators of marine ecosystem health, and yet, we often lack long-term population data to inform conservation decisions. With ~70% of the world’s seabird populations in decline since the 1950s, long-term population data become vital to understand the extent of loss.
The Leach's Storm-petrel (Hydrobates leucorhous) is the most common seabird nesting on islands in the Western Atlantic Ocean. Globally, available surveying data indicate that the storm-petrel populations are vulnerable and have declined by over 30% since the 1980s. Unfortunately, due to a lack of long-term data, it is difficult to establish the true scope of declines. Interestingly, one storm-petrel colony on Grand Colombier Island (~17 km southwest of Newfoundland), was believed to be relatively stable based on the limited available monitoring.
In a recent study, members of the Paleoecological Environmental Assessment and Research Lab (PEARL, Queen’s University Biology; PhD Candidate Mathew Duda, Professor Dr. John Smol) and collaborators used paleoecological evidence (lake sediments and seabird guano) to reconstruct the last ~5,800 years of storm-petrel population dynamics from Grand Colombier Island, and aimed to investigate if the colony appeared to be stable over longer time periods.
Duda et al. found that this globally important seabird colony is now only ~16% of its potential carrying capacity, and that the beginning of the decline coincided with nearby European settlement. The researchers’ work provides a unique historical context for present day populations of conservation concern, and contributes to mounting evidence for the historical impacts of humans on marine ecosystems. To learn more, read their article in the Proceedings of the National Academy of Sciences in the United States of America.
This research is co-authored by Sylvie Allen-Mahé, Christophe Barbraud, Jules Blais, Amaël Boudreau, Rachel Bryant, Karine Delord, Christopher Grooms, Linda Kimpe, Bruno Letournel, Joeline Lim, Hervé Lormée, Neal Michelutti, Gregory Robertson, Frank Urtizbéréa, and Sabina Wilhelm.
The storm-petrel impacted study pond on Grand Colombier Island. Photo by K Delord.
FUNCTIONAL SHIFTS OF SOIL MICROBIAL COMMUNITIES CONTRIBUTE TO INVASION SUCCESS
Invasive plants can have devastating effects on native species and ecosystem processes. Garlic mustard (Alliaria petiolata) is a problematic invader in North American deciduous forests. It produces chemicals that are thought to be allelopathic by disrupting arbuscular mycorrhizal fungi (AMF), which are important symbionts in the microbiomes of competing plants. However, the effect of garlic mustard chemicals on soil pathogens has received little attention, even though accumulating pathogens that are harmful to plant competitors could also explain the success of garlic mustard.
In a recent study, members of the Colautti lab (former MSc student Katherine Duchesneau, former BSc thesis student Anneke Golemeic, Dr. Rob Colautti), and Dr. Pedro Antunes (Algoma University Biology) use a natural, field setting to examine differences in the soil microbiome and roots of plants found co-occurring with and without garlic mustard.
Contrary to experimental studies, the authors find no changes in diversity or abundance of AMF in plants growing with garlic mustard, indicating that AMF suppression is not critical to the invasion success of garlic mustard. Instead, they find changes in microbial pathogen communities and slight increases in the root lesions of plants associated with garlic mustard. Additionally, the authors report changes in microbial communities cycling nitrogen, in line with earlier reports of increased nitrogen in soils from garlic mustard litter.
Their study is one of the first to investigate garlic mustard invasion in a natural setting and provides new insights into the ecological mechanisms of plant invasion. To learn more, read their article in the Pedobiologia.
Plants that grow with garlic mustard do not have altered AMF/EMF communities. However, they do exhibit differences in pathogen communities, increases in root lesions, and increases in microbial communities cycling nitrogen.
Celebrating Our Women Mentors
Queen’s Biology thanks our women mentors who are so instrumental to our development as scientists. Women mentors shape our scientific careers. They inspire us to pursue careers in biology, ensure we are confident and comfortable with whatever tasks we take on, foster a positive and supportive environment, help develop our research skills, go above and beyond for their students, and have long-lasting impacts on us.
Check out our video, where we thank and highlight some of the many women mentors the Queen’s Biology community has had the pleasure of knowing and being mentored by throughout our careers and lives.
DENSE SAMPLING OF BIRD DIVERSITY INCREASES POWER OF COMPARATIVE GENOMICS
More than 10,000 species of birds are alive today, from the smallest hummingbird to the largest ostrich. Researchers have now captured a broad sampling of genomic information from across the avian tree of life.
“Dense sampling of bird diversity increases power of comparative genomics”, published this month in Nature, reports on a large collaborative effort that includes members of the Friesen lab (Queen’s University Biology Department): Professor Dr. Vicki Friesen, and former PhD students Dr. Anna Tigano and Dr. Scott Taylor.
The main findings of this paper include the reporting on the genomes from 363 species of bird (encompassing 92.4% of bird families), 267 of which have been sequenced for the first time. This data has been produced for the Bird 10,000 Genomes (B10K) Project, which aims to sequence the genomes of all extant bird species, and is used to generate a super-phylogeny for the class Aves.
This collaboration and data collection have created an incredible publicly available genomic resource. Results will facilitate many future studies in evolution, ecology and molecular genetics, from evolutionary relationships among avian families, through the genomic basis of adaptations, to mechanisms of molecular evolution. Results will also aid conservation, for example by clarifying the relationships among species and providing baseline information for population-level sequencing.
All 10,135 bird species are shown on this phylogeny, purple branches represent the 363 species that now have at least one genomic assembly per sequenced family.
RANGE-EDGE PLANT POPULATIONS OF HIGH CONSERVATION PRIORITY LACK ADEQUATE HABITAT PROTECTION AND RESEARCH EFFORT
Southern Canada is home to many plants at the northern limits of their geographic ranges. These species are often rare and at-risk in Canada, though more broadly distributed south of the US border. While the conservation value of these peripheral populations is controversial, the ability of species to move to higher elevations and latitudes may be crucial for responding to climate warming and these peripheral populations may be particularly important for range movements. In a recently published paper, members of Chris Eckert’s lab (Queen’s University; Chris Eckert, Raeya Jackiw) and Anna Hargreaves’ lab (McGill University; Anna Hargreaves, Pascale Caissy, Sandra Klemet-N’Guessan) investigate conservation efforts and risk, as well as the distribution patterns of plants at their northernmost range limit in Canada. They ask if Canadian conservation prioritizes range-edge populations, and if conservation priorities are matched by habitat protection and research effort.
Caissy et al. find that most federally protected plants in Canada occur only at the northernmost limit of their range, and current habitat protection and research effort is inadequate for these species. The authors conclude that “…plant conservation in Canada is fundamentally linked to conserving range-edge populations, yet edge populations themselves are understudied, a research gap we must close to improve evidence-based conservation.”.
To learn more, read their article in Biological Conservation.
WHAT CAUSES HABITAT PARTITIONING IN URBAN-ADAPTED BIRDS?
How important is plasticity versus evolutionary divergence for habitat partitioning in nature? In a recently published paper, Queen’s Biology Associate Professors Fran Bonier and Paul Martin, and former Queen’s Biology MSc student Kevin Burke use a global dataset on urban birds to provide one of the few tests of the relative importance of plasticity versus evolutionary divergence underlying habitat partitioning. They find evidence for both. Greater habitat partitioning was associated with increased range overlap among dominant and subordinate species – a factor that is expected to increase the intensity of selection favoring evolutionary divergence. For birds that thrive in cities, however, the greatest impact on habitat partitioning appears to result from subordinates actively shifting out of cities when dominant species occur there, consistent with plasticity in response to aggressive, dominant species.
The study results suggest distinct ways to mitigate loss of biodiversity caused by urbanization. When dominant species thrive in cities, providing resources for subordinates that cannot be monopolized by the dominant (e.g., nest boxes with entrance holes too small for the dominant species to use) would help subordinates to persist. In the case of evolutionary divergence, adding distinct habitat refuges suited to subordinate species could help them colonize or persist in cities.
Overall, this global study provides new insight into the importance of two distinct processes that shape patterns of diversity in an urbanizing landscape.
For more, check out the paper in The American Naturalist.
A European Starling, Sturnus vulgaris, one of the focal species in a global comparative study of habitat partitioning among urban-adapted birds. (Credit: Paul Martin)
Congratulations to the recipient of the 2020 Ragai Ibrahim Award
The Ragai Ibrahim award is for the best publication by a Can Soc Plant Biol student member that appeared over the previous year. The paper that Mina won the award for is based upon some of her PhD thesis research: Ghahremani M, Tran H, Biglou SG, O'Gallagher B, She Y-M, Plaxton WC (2019) A glycoform of the purple acid phosphatase AtPAP26 co-purifies with a mannose-binding lectin (AtGAL1) secreted by phosphate starved Arabidopsis. Plant Cell Environment 42:1139–1157.
Black Lives Matter
The faculty, staff and students from the Department of Biology strongly condemn anti-Black violence and systematic racism against the Black, Indigenous, and People of Colour (BIPOC). The current COVID-19 pandemic has amplified the inequities in our society. We recognize that in the past Queen’s University has been complicit in perpetuating anti-Black racism (www.queensu.ca/inclusive/initiatives/picrdi). We reaffirm our commitment to anti-racism; we must and will do better.
Our university, faculty and department have much work to do to improve the climate for BIPOC LGBTQ2S students, and all of us need to work together to make a more just society, as well as a more equitable and inclusive university environment. Some initiatives are ongoing both at the faculty level (e.g., https://www.queensu.ca/artsci/node/1255) and in the department (https://biology.queensu.ca/resources/equity-diversity-and-inclusion-committee/) but much more need to be done. We encourage our faculty, staff and students to use their voices to address issues of equity and inclusion, and to initiate and support initiatives to better educate and help address racism in all of its forms. We will continue work with all levels at Queen’s to develop and support initiatives, and continue to listen to our colleagues and students to identify areas of action that will make a difference. We are open to input and criticism, but most importantly appreciate constructive ideas to move forward.
We welcome an open and constructive dialog in the department, but if you have specific ideas please send them to Brian Cumming and Shelley Arnott (Chair, EDI Committee, Biology)
Congratulations to the Biology Class of 2020
On Wednesday, June 3 of 2020, our graduating class of 223 students in Bachelors (Biology, Biology-Mathematics, Biology-Psychology, Biotechnology), Masters or PhDs degrees would be walking the stage in Grant Hall for their convocation ceremony. Unfortunately, this year a graduation ceremony was not possible, so our faculty made a special video tribute to them. Congratulations Class of 2020 from all of the faculty, staff and current graduate students in the Department of Biology. We are proud of you. We look forward to offering you a traditional ceremony in the future.
Doctor of Philosophy
- Cécilia Barouillet, Biology, Supervisors: B.F. Cumming, D. Selbie
- Qian Gu, Biology, Supervisor: P. Grogan
Master of Science
- Nagla Arab, Biology, Supervisors: P.G. Young, M.T. Greenwood
- Ying Chen, Biology, Supervisor: S.C. Lougheed
- Hannah Grace Driver, Biology, Supervisor: S.C. Lougheed
- Danielle Alanna Greco, Biology, Supervisors: S.E. Arnott, B.S. Schamp
- Joeline Lim, Biology, Supervisor: J.P. Smol
- Alexandra Claire McClymont, Biology, Supervisor: S.E. Arnott
- Joseph Quagraine, Biology, Supervisor: S.M. Regan
- Rachel Anne Van Dusen, Biology, Supervisor: R.M. Robertson
- Alyson Van Natto, Biology, Supervisor: C.G. Eckert
- Kurtis McKay Westbury, Biology, Supervisor: W.A. Nelson, C.D. Moyes
Bachelors - Biology
- Aghaeeaval, Mahsa, Major in Biology
- Ahac, Danika, Major in Biology
- Aksu,Sera Tamar, General in Biology
- Al Hadeethi,Mariam, General in Biology
- Allan, Christina, Major in Biology
- Aman, Danielle, Major in Biology
- Anderson, Macy Janelle, Major in Biology, Science Minor in Life Sciences
- Arhen, Benjamin Baseda Asamoah, Major in Biology
- Armour, Amy Maureen, Major in Biology, with Distinction
- Armstrong, Alyssa Anne, Major in Biology
- Asselstine, Isabella, Major in Biology, Arts Minor in World Language Studies with Distinction
- Babcock, Taylor Alexis, Major in Biology, Arts Minor in Psychology
- Balasubramaniam,Kapillesh, Major in Biology
- Ben Or,Neta, Major in Biology
- Bierd,Mitchell, Major in Biology
- Boden,Ainsley Roberts, Major in Biology
- Bonifacio-Proietto, Francesco Luca, Major in Biology, Arts Minor in Geography with Distinction
- Bosorogan, Andreea Artemiza, Major in Biology, with Distinction
- Broda,Olivia, Major in Biology
- Burchat,Caroline Elizabeth, Major in Biology
- Cameron,Emma, Major in Biology
- Campbell,Jillian Nicole, Major in Biology
- Chaput,Natalie Hanne, Major in Biology
- Choi,Nandaraye Carissa Yan-Yan, Major in Biologyy
- Conrad,Jillian, Major in Biology
- Cooke,Jennifer Elizabeth, Major in Biology
- Cournoyea,Olivia Grace, Major in Biology
- Crivello,Emma Antonella, Major in Biology
- Curran,Quinn Lucy, Major in Biology
- Delfim,Daniel Soares, General in Biology
- Deng,Weiran, Major in Biology
- Elia,Francesca, Major in Biology
- Elliott,Emily Anna, Major in Biology
- Emmott,Angeline, Major in Biology
- Ewing,Meghan, Major in Biology, Science Minor in Geological Sciences
- Fedus,Amber Lynne, Major in Biology
- Flewwelling,Luke De Luisa, Major in Biology
- Filipopoulos,Jonathan, General in Biology
- Freeman,Kadie Anne, General in Biology
- Fullerton,Eric James Fraser, General in Biology
- Gaete,Kayla-Kay, Major in Biology
- Goetz,Dylan, Major in Biology
- Gorodetsky,David, General in Biology
- Grandal,Nestor Al, Major in Biology, Arts Minor in Psychology
- Green, Hailey Alexandra, Major in Biology
- Guidice, Amber Jade, Major in Biology
- Gunasinghe, Tasha Nihani, Major in Biology
- Hamburger, Eleane Chana Bertl, Major in Biology
- Han, Lisa, Major in Biology
- Hann, Michael Emil, Major in Biology
- Hansen, Rachel Jade, Major in Biology
- Harper, Alison Lindsay, Major in Biology, Arts Minor in Psychology
- Hemy,Sarah Renee, General in Biology
- Honess, Isabella, Major in Biology,with Distinction
- Howard, Kristina Grace, Major in Biology, Arts Minor in Music
- Hunter, Lara, Major in Biology
- Jallow, Muhammed, Major in Biology
- Jay, Victoria, Major in Biology,Arts Minor in Spanish and Latin American Studies with Distinction
- Jia, Hao Ran, Major in Biology, Science Minor in Geological Sciences
- Johnson, Lauren Anne, Major in Biology
- Joiner,Liam, General in Biology
- KC, Nisha, Major in Biology
- Kielbasa, Allison Marie, Major in Biology
- Kim, Jenna, Major in Biology
- Kim, Yu Mi, Major in Biology
- Kok, Orhun Halil, Major in Biology
- Lafreniere, Logan Alexandra, Major in Biology
- Lam,Jessica Kimberly, Major in Biology
- Larson, Morgan, Major in Biology
- Leranbaum, Madeline Bea, Major in Biology
- Lindow, Cassandra Annika, Major in Biology
- Litwinczuk, Alicia Wendy, Major in Biology
- Macdonald, Mina, Major in Biology
- Macgillivary, Taylor Dawn, Major in Biology
- MacIntyre, Kaitlin, Major in Biology, Arts Minor in History
- Macmillan, Katherine Lynn, Major in Biology
- Macmillan, Margaret Evelyn, Major in Biology
- Manley, Kathryn Sandra, Major in Biology
- Marcellus, Mia Catherine, Major in Biology, with Distinction
- Marck, Lindsey Nicole, Major in Biology, with Distinction
- Marcuzzi, Sofia Nicole, Major in Biology, Arts Minor in French Studies with Distinction
- Marduhaev, Jonathan, Major in Biology, Arts Minor in Psychology
- Marshall, Matthew Grant, Major in Biology
- Marshall, Olivia Isobelle, Major in Biology
- Marshall,Patrick, General in Biology
- Marshall, Shannon Jane Elizabeth, Major in Biology
- Martel,Genevieve Aldora, Major in Biology, Arts Minor in Health Studies
- Matharu,Tavleen, Major in Biology
- McCabe,Gabrielle Audrey Marianneke, Major in Biology, with Distinction
- Morris,Andrea Nicole, Major in Biology
- Murray, Kathryn Grace, Major in Biology, with Distinction
- Neapole, Caitlin, Major in Biology, with Distinction
- Nella, Adriano Kristian, Major in Biology, with Distinction
- Ng,Angie On Kei, Major in Biology, Arts Minor in Art History
- Nowshir, Thalib, Major in Biology
- Ntim-Addae, Abena, Major in Biology
- Nystedt, Adrianna Elizabeth, Major in Biology
- Page,Austin David, Major in Biology
- Parida, Ayushee, Major in Biology
- Parmar, Harjit Kaur, Major in Biology
- Pellmann,Madison, Major in Biology
- Pennington,Jessica Lillian, Major in Biology
- Peterson,Nell, Major in Biology
- Piccone, Amelia, Major in Biology
- Plouffe, Sydney, Major in Biology, with Distinction
- Pountney, Emily, Major in Biology, Arts Minor in Psychology with Distinction
- Premji,Jameel, Major in Biology
- Probizanski, Alexandra Diana, Major in Biology
- Pushpanathan,Raaghavi, General in Biology
- Puskas, Jacob, Major in Biology
- Raud, Silvi, Major in Biology
- Rees,Rhiannon Albertina, Major in Biology
- Robertson, Allison Nicole, Major in Biology
- Robertson, Krista Jan, Major in Biology, with Distinction
- Robinson, Chloe Elizabeth, Major in Biology, with Distinction
- Rondeau,Carole Elizabeth, Major in Biology, Arts Minor in Psychology
- Rooth,Tye Robert, Major in Biology
- Roy, Prama, Major in Biology, with Distinction
- Rozon, Charlotte Grace, Major in Biology, Arts Minor in Environmental Studies with Distinction
- Rudiak, Alexandra Karina, Major in Biology, with Distinction
- Sawula, Danielle Kathryn Louisa, Major in Biology
- Sears,Samantha Bronwyn, Major in Biology
- Severino,Sabrina, Major in Biology
- Silverthorn, Megan Riley, Major in Biology, with Distinction
- Simpson,Zahra, Major in Biology
- Smith,Jaedyn, Major in Biology, Science Minor in Geological Sciences with Distinction
- Smith,Kyra Nancie, Major in Biology, with Distinction
- Snider,Taylor Doris, Major in Biology, Arts Minor in History
- So,Hoi Yee, Major in Biology, Arts Minor in Classical Studies
- So,Jeffrey Philip, Major in Biology
- Summers,Alyson Marie, Major in Biology, Arts Minor in Religious Studies
- Sutharsan,Lashaanii Lancey, Major in Biology, Arts Minor in Gender Studies
- Tanney,Cailun Ann Simone, With Professional Internship, Major in Biology
- Taylor,Summer Dyment, Major in Biology
- Utom, Hannah Hazel Fudalan, Major in Biology, with Distinction
- Vakeeswaran,Vruksha Karen, Major in Biology
- Van Stiphout,Cassidy, Major in Biology
- Velichka, Jenni, Major in Biology, Arts Minor in Environmental Studies with Distinction
- Walker,Emma Jane Lougheed, Major in Biology, with Distinction
- Walker,Kathleen, Major in Biology
- Ward,Samantha Victoria, Major in Biology, Arts Minor in Psychology
- Waters,Kathryn Jeanne, Major in Biology
- Watts,Aimee, Major in Biology
- Ye,April, Major in Biology
- Yueh,Henry, Major in Biology
Biology - Mathematics
- Allan, Gillian Mary Mckenzie, Specialization in Biology - Mathematics, with Distinction
- Caklec, Jaycelyn Cori, Specialization in Biology - Mathematics
- Darragh, Christine Nicole, Specialization in Biology - Mathematics
- Edie, Shannon, Specialization in Biology - Mathematics, with Distinction
- Liu, Yuan, Specialization in Biology - Mathematics
- Main, Sasha, Specialization in Biology - Mathematics, with Distinction
- Perkins, Cameron Thomas, Specialization in Biology - Mathematics
- Smith, Claire Alexandra Hass, Specialization in Biology - Mathematics, with Distinction
- Stanton, Laura Faye, Specialization in Biology - Mathematics
- Sun, Yi, Specialization in Biology - Mathematics
- Tittel, Matthew Jared, Specialization in Biology - Mathematics, with Distinction
- Ahmed, Zaryab, Specialization in Biology - Psychology
- Ashcroft, Catherine Cecile, Specialization in Biology - Psychology
- Axelson, Jennifer Emma, Specialization in Biology - Psychology
- Bourne,Emily, Specialization in Biology - Psychology
- Boverhof,James Orion, Specialization in Biology - Psychology
- Brockie,Sydney Tyner Grace, Specialization in Biology - Psychology, with Distinction
- Chandran, Devante, Specialization in Biology - Psychology, with Distinction
- Cowper, Elinor Catherine Dysart, Specialization in Biology - Psychology, with Distinction
- Cox, Christopher Raymond, Specialization in Biology - Psychology
- Elman-Walker, Ariel, Specialization in Biology - Psychology
- Falzon, Mariah,S Specialization in Biology - Psychology
- Hadlaw, Alexandra, Specialization in Biology - Psychology
- Ingratta, Laine Elizabeth, Specialization in Biology - Psychology
- Keyes, Emily, Specialization in Biology - Psychology
- Kovacs, Aaron, Specialization in Biology - Psychology, with Distinction
- Lee, Karen Huafang, Specialization in Biology - Psychology
- Lehan, Mikela Margaret, Specialization in Biology - Psychology
- Livingston, Eliza, Specialization in Biology - Psychology, with Distinction
- Lum Smith,Hannah, Specialization in Biology - Psychology
- McGee,Sarah Caitlin, Specialization in Biology - Psychology
- Miller, Zoe Amelia, Specialization in Biology - Psychology
- Morris, Alanna, Specialization in Biology - Psychology, with Distinction
- Murray, Kiyomi Irene, Specialization in Biology - Psychology, with Distinction
- Ross, Hannah Claire, Specialization in Biology - Psychology
- Rutherford, Annabel, Specialization in Biology - Psychology, with Distinction
- Sadoon, Farah Yasmin, Specialization in Biology - Psychology
- Samarawickrema,Kushan, Specialization in Biology - Psychology
- Simone,Genevieve, Specialization in Biology - Psychology
- Stone, Erica Rachel, Specialization in Biology - Psychology, with Distinction
- Teitelbaum,Emma,Specialization in Biology - Psychology, with Distinction
- Toth,Kaelin Mckenna, Specialization in Biology - Psychology, with Distinction
- Weinryb,Sydney Nicole, Specialization in Biology - Psychology
- Welikala,Tarindi Navodya, Specialization in Biology - Psychology, with Distinction
- Wilson,Siobhan Mackenzie, Specialization in Biology - Psychology, with Distinction
- Wulfsohn,Hannah, Specialization in Biology - Psychology
- Bekking,Clare, Specialization in Biotechnology, with Distinction
- Camara, Bettina, Specialization in Biotechnology
- Chevtchouk,Michelle, Specialization in Biotechnology
- Cohen,Ethan, Specialization in Biotechnology, with Distinction
- Ellis,Kai Howson, Specialization in Biotechnology, with Distinction
- Ewen,Kelsey, Specialization in Biotechnology
- Ghojeh Biglou,Sanaz, Specialization in Biotechnology, with Distinction
- Hardikar,Navneetha Sharath, Specialization in Biotechnology
- Lai,Zoe Pui Lun, Specialization in Biotechnology, with Distinction
- Lamoureux,Kathryn Elise, Specialization in Biotechnology
- Low,Mun Seong, Specialization in Biotechnology
- Nowlan,Ferris, Specialization in Biotechnology, with Distinction
- Omar,Kinzy Ali, Specialization in Biotechnology
- Raytek,Lee Marie, Specialization in Biotechnology, with Distinction
- Zaza,Yossra Khaled, Specialization in Biotechnology
Why do endocrine traits vary within a population?
If changes in circulating hormones regulate animals’ responses to their environments, then why do individuals that live together differ in their endocrine phenotypes? In a recently published paper, Queen’s Biology Associate Professor Fran Bonier and coauthor Dr. Bob Cox of the Department of Biology at the University of Virginia develop two hypotheses, suggesting that variation in endocrine traits within a population can occur because each individual expresses its own context-dependent optimal phenotype, or because some individuals' phenotypes reflect constraint or maladaptation and natural selection on these traits is ongoing. To test the first of these hypotheses, they conducted a meta-analysis of field experiments to see whether hormone manipulations move animals away from their optimal endocrine phenotypes. From Fran, “Overall, hormone manipulations generally reduce fitness, suggesting individuals do express optimal endocrine phenotypes. However, some of the variation from this average effect was equally interesting, and points to sex-specific differences in the ways that hormones regulate life history.” For more, check out the paper in Molecular and Cellular Endocrinology.
Visit the Bonier lab website to learn more about Fran’s work.
Characterizing the Holocene climate of Northeastern Ontario
Despite its susceptibility to human-induced climate change, past conditions of the boreal forest region of Canada are not fully understood. Changes that occurred during the Holocene Thermal Maximum are of particular interest, as this previous period of enhanced warming may help us to forecast how present day climate warming may affect the region. Recent Queen’s Biology graduate Brett Elmslie and current Queen’s Biology PhD Candidate Cale Gushulak work to better understand the conditions of the Holocene Thermal Maximum in the boreal forest region of Northeastern Ontario using fossilized pollen, diatoms, and sedimentary pigments to characterize changes that occurred in Charland Lake. From Cale, “The results of this work are very interesting as they show the importance that the landscape has on the sedimentary record in lake systems.” To learn more, read their article in The Holocene.
In addition to Brett and Cale, this paper was authored by Maxime P. Boreux of the Paleoecological Environmental Assessment and Research Laboratory and the Department of Geography and Planning at Queen’s University, Scott Lamoreux of the Queen’s University Department of Geography and Planning, Peter R. Leavitt of the Institute of Environmental Change and Society at the University of Regina and the Institute for Global Food Security at Queen’s University Belfast, and Brian F. Cumming of the Paleoecological Environmental Assessment and Research Laboratory at Queen’s University. This work was part of Brett Elmslie’s MSc work and Cale Gushulak’s PhD work in the Cumming Lab in the Queen’s Biology Department.
A family of protein kinases key to plant immune signaling
The ability to guard against disease-causing pathogens is essential for plants living in microbe-rich environments. Learning about what signalling pathways are involved in the detection of these stressors is key to understanding plant immune responses. In a recently published review, Queen’s Biology Postdoctoral Fellow Melissa Bredow and Assistant Professor of Plant Biology Jacqueline Monaghan contribute to this goal, detailing the role that calcium-dependent protein kinases play in the regulation of plant immune signalling. To learn more, read the review in Molecular Plant-Microbe Interactions.
This publication is part of Melissa Bredow’s postdoctoral work in the Monaghan lab in the Queen’s Biology Department.
Are Mandt’s black guillemots evolving to breed earlier?
The changing climate presents a formidable challenge to many species, which must adjust their phenology to match their changing environments. Teasing apart whether observed adjustments result from plasticity or true evolutionary change is key in understanding a population’s capacity to overcome this obstacle. In a recently published paper, Queen’s Biology graduate student Drew Sauve and colleagues use a long-term dataset to test whether changes in environmental conditions have led to the evolution of earlier breeding in Mandt’s black guillemots. From Drew, “Our study provides a perspective from the Arctic, where atmospheric temperatures are increasing more rapidly than at lower latitudes. We found that most of the observed change in timing of breeding was driven by changes in individual behaviour in response to annual variation in snowmelt and found little evidence that changes in breeding time are driven by evolutionary change. Unlike many studies, we found evidence of limited genetic variation underlying breeding time, which might limit the ability of evolution to change the timing of breeding in this population. If limited genetic variation is common in Arctic species, the potential for them to respond to ongoing climatic change may be restricted. ” To learn more, read the article in Functional Ecology.
In addition to Drew, this paper was authored by George Divoky of Cooper Island Arctic Research, and Vicki L. Friesen, Queen’s Biology Professor of Evolutionary and Conservation Genetics. This work was part of Drew Sauve’s MSc work in the Friesen lab in the Department of Biology at Queen’s.
For additional coverage of this project and related work visit National Geographic.
Why do members of the same population behave differently?
In nature, we often see members of one population doing very different things. Despite this common observation, however, understanding how behavioural diversity is maintained within a single population has remained a challenge. In a recently published paper, Queen’s Biology graduate Adam Meyer and Queen’s Biology Associate Professor of Population Ecology Bill Nelson use an ingenious experiment to investigate how two different daily movement patterns co-occur in a population of freshwater zooplankton. From Adam, "These behaviours were fascinating to us because they caused animals in the same population to experience extremely different environments. Our experiment used custom built robots and migration tubes to control the migration of thousands of zooplankton. This allowed us to measure the growth associated with each behaviour. To my knowledge, this is the first study to demonstrate experimentally that animals in the same population can obtain the same fitness despite migrating over vastly different environments." To learn more, read their article in Behavioural Ecology.
This work was part of Adam's MSc thesis in the Nelson lab in the Queen's Biology Department.
How can plants better obtain phosphate?
Plants need phosphate (Pi) to grow, but getting enough of this important macronutrient can be difficult. The susceptibility of the soil's organic?P pool to enzymatic hydrolysis is an important constraint for crop Pi acquisition. Thus, identifying secreted proteins that facilitate root Pi acquisition from the soil's organic-P pool is a key goal in plant science and crop studies. In two recently published papers, Queen’s Biology Postdoctoral Researcher Dr. Mina Ghahremani and colleagues investigate the interaction between a secreted AtPAP26 'glycoform' and the lectin AtGAL1. AtPAP26 is a purple acid phosphatase enzyme of the model plant Arabidopsis that plays a central role in Pi scavenging from extracellular organic-P compounds, whereas lectins are sugar-binding proteins involved in a variety of pivotal biological processes owing to their high affinity and specificity for the attached sugar chains of glycoproteins. From Mina, "This research has provided the first definitive evidence for involvement of glycobiology (i.e. secreted glycoforms or lectins) in plant Pi-starvation responses. Our results support the hypothesis that that binding of AtPAP26's glycans by AtGAL1 enhances AtPAP26 function to facilitate extracellular Pi-scavenging by Pi-starved Arabidopsis”. Learn more about this exciting work in Plant, Cell & Environment here and here.
In addition to Mina, this work was authored by former Plaxton lab post-doc Prof. Joonho Park (Dept. of Fine Chemistry, Seoul National University of Science and Technology); Erin Anderson, Dr. Naomi Marty-Howard, and Prof.Rob Mullen (Dept. of Molecular and Cellular Biology, University of Guelph); former Plaxton lab PhD student Dr. Hue Tran (Oncolytics Biotech Inc.); Dr. Yi-Min She (Centre for Biologics Evaluation, Biologics and Genetic Therapies Directorate at Health Canada); and BSc student Sanaz Biglou, MSc student Bryden O’Gallagher, and Prof. William Plaxton of Queen’s University. This work was part of Mina’s PhD thesis research in the Plaxton lab in the Department of Biology at Queen's.
Why are there algal blooms in Dickson Lake?
Algal blooms are becoming alarmingly common in Ontario’s lakes. These rapid accumulations of algae or cyanobacteria can severely harm lake ecosystems, and can be encouraged by a variety of environmental changes. In a recently published paper, Queen’s Biology PhD Candidate Liz Favot and colleagues use a paleolimnological approach to uncover what changes may have accompanied recent cyanobacterial blooms in Algonquin Park’s Dickson Lake. From Liz, “We don't yet have a complete understanding of the environmental triggers for cyanobacterial blooms in low-nutrient systems, but there are indications that climate change is playing a role. Inferences from subfossil diatoms in the paleo record show that nutrient levels have not changed in Dickson Lake over the last two centuries. This finding is important to start to rule out several nutrient-related hypotheses for why the blooms formed (like nutrient pulses from a breached beaver dam, bird guano, or insect frass). We analyzed an additional four proxies (cyanobacterial akinetes, chlorophyll a, non-biting midges, and cladoceran zooplankton) and each gave some indication that the blooms that occurred in Dickson Lake in 2014 and 2015 were unprecedented over the last ~200 years, and that climate warming and ensuing effects on water temperature and thermal structure are potential causal factors”. Learn more about this project in the Journal of Paleolimnology.
In addition to Liz, this work was authored by Dr. Kathleen M. Rühland, Anna M. DeSellas, and Dr. John P. Smol of the Paleoecological Environmental Assessment and Research Laboratory in the Department of Biology at Queen’s, and Ron Ingram and Dr. Andrew M. Paterson of the Dorset Environmental Science Centre. This work is part of Liz’s PhD work in Dr. John Smol’s lab in the Department of Biology at Queen’s.
How does glacial runoff affect lake habitats?
To explore this question, Queen’s Biology PhD Candidate Cécilia Barouillet and colleagues examined how the diversion of a silt-laden river into a clear water lake has influenced the productivity of the lake since its construction in ca. 1930, and used an upstream lake as a reference. From Cécilia, “Our study site offered the perfect setting to explore this question, and it was very exciting to be part of this project. Our results show evidence that the introduction of turbid water into a clear water lake led to a decline of the primary producers (i.e. diatom algae) and primary consumers (i.e. cladoceran zooplankton). The effect of glacial runoff on the basal food-web productivity of a lake have important implications for management questions. For instance, our study lakes sustain Sockeye Salmon populations that have important socio-economical and ecological values in the region, the decline in productivity may have reduced the food resource available for the salmon.” Find the full paper in the Canadian Journal of Fisheries and Aquatic Sciences.
In addition to Cécilia, this work was authored by Dr. Brian F. Cumming and Kathleen R. Laird of the Queen's Biology Paleoecological Envrionmental Assessment and Research Laboratory, Dr. Christopher J. Perrin of Limnotek Research and Development Inc., and Dr. Daniel T. Selbie of Fisheries and Oceans Canada. This work is part of Cécilia's PhD thesis in Brian Cumming's lab in the Department of Biology at Queen's.
Why are tree swallows in decline?
Understanding which aspects of sweeping global change are driving the decline of a given group of organisms is a challenge. Avian aerial insectivores, birds that feed on flying insects, have gained particular attention for their precipitous, but poorly understood decline. In their new paper, recent Queen’s Biology graduate Amelia Cox and colleagues examine changes in a Tree Swallow population at the Queen’s University Biological Station over 40 years to understand this phenomenon. From Amelia, “Climate change isn't just about changing temperatures. Increasing spring rainfall is the reality for our region, and for birds like Tree Swallows, this can mean nestlings starve”. Learn more about this project in Proceedings of the Royal Society B.
In addition to Amelia Cox, this work was coauthored by emeritus professor Dr. Raleigh Robertson who began the Tree Swallow study in 1975, Dr. Ádám Lendvai at the University of Debrecen, Hungary, Queen's undergraduate student Kennedy Everitt, and Dr. Fran Bonier in the Department of Biology at Queen's. This work was part of Amelia’s MSc thesis in Fran Bonier’s lab.
Check out other coverage of this work here.
Best practices for studying plant enzymes
Isolating and studying enzymes can be a tricky business, especially in plants whose enzymes are particularly prone to unwanted proteolysis (partial degradation) following their extraction. This seminal review, by Queen’s Biology Professor and Research Chair of Plant Biochemistry Bill Plaxton, tackles this key challenge in the plant sciences by discussing: (i) how partial proteolysis by endogenous proteases can lead to marked, artefactual alterations to an enzyme’s biochemical and kinetic/regulatory properties, and (ii) practical advice on how to detect and prevent unwanted proteolysis during enzyme extraction and purification from plant. For more, check out his article in Plant and Cell Physiology and visit the Plaxton lab website.
Why do some birds migrate?
Migration is a taxing and dangerous behaviour, but struggling through an inhospitable winter can be even more difficult. In animals that have the opportunity to either remain on their breeding grounds year-round or move to more tolerable environments for the winter, what determines who stays and who leaves? Recent Queen’s Biology graduate Dr. Catherine Dale and colleagues studied a partially migratory population of western bluebirds to learn about what environmental and individual conditions may tip the scales of this trade-off. From Catherine, “The bluebirds in the Okanagan Valley represented a great chance to investigate the factors shaping migratory strategies in partial migrants. We learned a lot about what determines where individual birds spend the winter, were able to interact with many wonderful bluebird box owners and monitors, and also got the chance to work in one of the most beautiful parts of the country!” Read more about Catherine’s work in the Journal of Avian Biology. This work was part of Catherine's PhD thesis research with emeritus professor Dr. Laurene Ratcliffe.
Catherine is also a co-founder of the Dispatches from the Field blog, which is dedicated to sharing the unique experiences of field biologists around the world. Check out the blog and follow @fieldworkblog to learn about some awesome field adventures, including Catherine's!