Province-wide patterns, and between-layer associations, of mycorrhizal host type within British Columbia forests
Abstract: Plant-soil feedbacks within forests can facilitate or inhibit success among neighbour seedlings depending in part on the type of mycorrhizal association; ectomycorrhizal (ECM) associations tend to yield positive, facilitative effects whereas arbuscular mycorrhizal (AM) associations tend to elicit negative, antagonistic effects. Given these potential feedbacks, details about the fine-scale prevalence and distribution of MF hosts and their association types, particularly within each forest layer, could improve our understanding of recruitment dynamics and diversity patterns within forests. Using forest survey data from more than 25,000 plots distributed throughout British Columbia (BC), we first show how the proportion of different mycorrhizal types varies between the herbaceous layer and the canopy, and the encounter probability between types across BC. We then quantify the strength of the association between the proportion of AM and ECM-compatible host cover in the canopy with the same proportion in the sub-canopy and herbaceous layers. Our findings reveal significant negative associations between AM hosts and neutral associations between ECM hosts, but also underscore how encounter probabilities varies enormously among forest types.
DAZED AND CONFUSED: a naturalist in the 20th century
Abstract: As I am retiring from my faculty position at the end of this month, I have been asked to give this exit seminar, though I am not actually going anywhere. I will reflect on what it was like to be a naturalist in the last half of the twentieth century, with the coming of age of evolutionary biology and the emergence of evolutionary ecology and behavioural ecology as vibrant and exciting subdisciplines. This has truly been a golden age for evolutionary biology with new concepts (kin selection, sperm competition, honest signalling, island biogeography, selfish genes), new instruments for tracking, recording and observing animals and plants (GPS, drones, satellites, citizen science) , and new tools for data analysis, writing, and drawing graphs (desktop computers, GUIs, R, machine learning). While I have embraced all of these ideas and technologies with a passion, I still see a lot of value in getting out into the wilds with a pencil, a notebook, and an enquiring mind.
Thinking outside the park: a landscape ecology approach to urban ecosystem services Abstract: The current era of unprecedented urban growth has markedly changed ecosystem structure, function, and biodiversity, and consequently the ecosystem services that our health and wellbeing depend on. To work towards more sustainable, liveable cities, it is important to understand where there are opportunities to manage cities for increased ecosystem service provision – requiring an understanding of urban areas as spatially heterogeneous and temporally dynamic ecosystems. Drawing on synthesis, observational, and citizen science approaches, I will discuss how landscape structure, land-use history, and biodiversity can impact multiple ecosystem services in urban landscapes. Specific examples are drawn from empirical work in the mid-size city of Madison, Wisconsin, including: the role of agricultural legacies and contemporary land-use in driving patterns of soil-based ecosystem services; a novel, sensor-based approach for quantifying the potential of urban forest management for climate adaptation; and the use of citizen science approaches in urban invasion ecology.
The immediate phenotypic effects of whole-genome duplication on asexual reproduction through clonality
Abstract: Polyploidy, having 2 or more complete chromosome sets, is extremely common throughout the flowering plants and is believed to play a large role in speciation and diversification. However, surprisingly little is known about the mechanisms that contribute to polyploid success in natural populations. Here I will present my work on the immediate phenotypic effects of whole-genome duplication (WGD) on asexual reproduction via clonality, a trait that is expected to promote polyploid establishment, by comparing diploids and newly synthesized polyploids in two study species. The use of synthesized polyploids in studying the evolutionary and ecological consequences of polyploidy remains rare, but is indispensable for understanding the specific role of WGD in evolutionary divergence between polyploids and their diploid progenitors.
RoboScientist: Whale research in collaboration with machines
Abstract: Whales and dolphins has always been a challenge, as they spend most of their lives below the surface. Oceanic conditions can also make observations tricky. Fortunately, technological developments are opening up new avenues of study. We can now deploy equipment into the ocean to eavesdrop on passing animals and attach tags to track their underwater movements. Most recently, drones and remotely operated underwater vehicles have given us previously unimaginable opportunities. With the help of these technologies, we are beginning to unlock some of the secrets kept by these enigmatic species.
Selection for elaborate female traits: sex-biased resource allocation in insects
Abstract: Sexual selection theory was developed to describe the elaborate sex-specific traits that result from intra-specific competition for mates. Since then, a substantial body of theoretical and empirical literature has revealed sexual selection to be a common phenomenon that frequently selects for weapons or ornaments that improve male reproductive success. However, in the rare cases that female-specific elaborate traits arise, we know very little about how theoretical and verbal models of ornament evolution apply. My work looks at how ecology and evolution shape sex-specific resource investment in diverse insect taxa. I will present recent work on female-specific resource investment within and between species including female ornamentation, sexual size dimorphism, and sex-biased immune expression.
Marine conservation genomics: exploring the past, present, and future of oceanic ecosystems
Many marine ecosystems have been dramatically changed due to anthropogenic influences, yet, monitoring these changes can often be challenging due to the inaccessible nature of the marine environment. Genomics can offer us unprecedented insights into aspects of these ecosystems, allowing us to design management strategies to increase sustainability and conserve marine species. In this talk, I will use examples from my own research into seabird and fish populations to highlight some of these techniques. I will show how we can use genomics to illuminate species’ responses to past climate change and therefore offer us a window into how they may respond to future climate change. I will demonstrate the use of genomics in informing the management of exploited fish stocks to maintain the resilience of dwindling populations and I will talk about how I am using seabirds and genomics to gain a glimpse into the future, increasing our ability to set appropriate catch limits for important forage fish stocks in advance of current monitoring methods.