SAFS hosts weekly lunch-time seminars where students and faculty share findings from their current research. Read through our past seminars to get an idea of topics covered and be sure to check out our events calendar to download upcoming seminars on your calendar.
Sierra Adibi – 9/27
Title: RoboRay: Developing a representative model and effective control policy for underwater wireless sensing
Sierra A. Adibi is an NDSEG Graduate Research Fellow and fourth year doctoral student in the William E. Boeing Department of Aeronautics & Astronautics at the University of Washington, and uses she/her pronouns. Sierra’s work is in model and control development for novel, nonlinear systems, and her research interests include the intersections of robotic controllability and swarm-type multi-agent policies. She is passionate about using robots to improve the quality of life of humans around the world, while simultaneously prioritizing environmental and wildlife conservation.
Sierra will discuss the development of RoboRay, a robot designed to act as a node in an Underwater Wireless Sensing Network. RoboRay’s novelty stems from its unique geometry which presents both benefits and challenges in the development of a representative model and effective control policy. This talk will cover the modeling tools, system behavior, simulation results, and control exploration for RoboRay.
Lauren Buckley – 10/4
Title: TrEnCh: Tools for TRanslating ENvironmental CHange into organismal responses
Many efforts to forecast ecological responses to climate change are based on air temperatures at coarse spatial (degrees) and temporal (months) resolutions, but animals respond to multiple aspects of the environment at scales of minutes and meters. Our TrEnChProject aims to improve ecological forecasts by providing computational and visualization tools to address these discrepancies. The seminar will introduce and discuss the initiative. Our suite of tools will enable extracting fine spatial and temporal scale microclimate data, translating microclimate (air and surface temperatures, radiation, and wind) conditions into animals body temperatures by calculating energy balances, and mapping body temperatures and regions of thermal stress. We will also present case studies of how animals are impacted by climate and climate change. We aim to improve ecological forecasting tools for education, policy, and research.
Elizabeth Brasseale – 10/11
Title: Larval transport modeling support for identifying population sources of European green crab in the Salish Sea
Jennifer Lâm-Anh Gosselin – 10/18
Title: Direct and carryover effects on survival of juvenile and adult wild Chinook salmon migrating through a hydropower system
Understanding freshwater-marine carryover effects in anadromous salmonids can help to inform river management and forecast ocean survival. We examine how freshwater, marine and fish conditions can affect survival across life stages: 1) downstream-migrating smolt, 2) ocean, and 3) upstream-migrating adult. Explanatory variables (including river temperature, flow, % water spilled, smolt length, migration timing, sea surface temperature, and the North Pacific Gyre Oscillation index) are tested for “direct” effects occurring in the same life stage as the survival response. Smolt-life-stage explanatory variables (including juvenile transportation and a dam passage index) are also tested for “carryover” effects on ocean survival. We examine these relationships using a Bayesian Cormack-Jolly-Seber mark-recapture model that includes random interannual variation in survival and detection probabilities. We utilize individually passive-integrated-transponder tagged wild spring/summer Snake River Chinook salmon (Pacific Northwest, USA) outmigrating 2001–2016. In this talk, I will present the relative magnitudes of influence the direct and carryover effects can have on survival. Our findings help assess where river management efforts may be most influential on survival across these three life stages.
Also, as part of this quarter’s all-female line-up of speakers, I will describe how I fall into underrepresented groups (women, mothers, elderly caregivers, and Vietnamese people). As one data point among statistics of underrepresented groups, I will briefly discuss a few perspectives I have reflected upon in context of aquatic and fishery sciences and the sciences at large.
Madi Shipley – 10/25
Title: Eastern Bering Sea Tanner crab MSE: evaluating harvest control rules in a cooperative framework
Wu-Jung Lee – 11/1
Title: Rising up to the challenges of big acoustic data
Title: Probabilistic Contour Models of the Arctic Sea Ice Edge
Abstract: Reduced sea-ice cover in the Arctic has increased commercial shipping, tourism and search-and-rescue needs in the region. Since sea ice is costly and time-consuming to traverse, these changes have increased the need for forecasts of the sea-ice edge at seasonal and sub-seasonal time scales. Probabilistic forecasts are well suited for this task, since forecast uncertainty must be accounted for to accurately assess the risk of a particular navigation route. In this talk, I present a probabilistic model for the sea ice edge contour. Unlike existing models, I directly represent the contour, treating it as a sequence of connected points. Using a Bayesian framework, I estimate a multivariate distribution for how points on the contour move jointly. Physical constraints such as land boundaries are also considered. l then extend this technique to also incorporate information from bias-corrected output from dynamic (physics-based) sea ice models. Finally, I compare the performance of these new sea-ice edge forecasts with existing dynamic and statistical approaches.
Lisa Pfeiffer – 11/15
Title: A Safer Catch? The Role of Fisheries Management in Fishing Safety
Risk exposure may be considered one of the defining characteristics of fisheries. Fisheries management has not seriously grappled with the role that managers have played in exacerbating the risk by creating conditions for a race-for-fish–a market failure whereby individuals have the incentive to compete with each other for catch. How do property rights-based management systems contribute to improvements in safety outcomes in fisheries? There is some evidence that property rights to the fish prevent and correct race-for-fish type situations, with complimentary improvement in some measures of safety. We develop a conceptual framework for examining the mechanism by which risk-taking is expected to decrease. We compile data and empirically investigate changes in risk-taking behavior for seven US fisheries that underwent transitions from various forms of regulated open access to various forms of catch shares management. We find that the changes in risk-taking behavior vary, and can explain the major differences using our conceptual framework. The scale of the decrease in risk-taking behavior depends on the degree to which the race-to-fish incentives were created by regulation, and the degree to which race-to-fish incentives were dissipated upon conversion to catch share management.
Rebecca Buchanan – 11/22
Title: Relating Steelhead Migration and Survival to Management Strategies in a Tidal Estuary
The Sacramento-San Joaquin river delta in the Central Valley of California is a heavily modified tidal estuary that provides water for agricultural and municipal use for millions of Californians, and is also an important migratory corridor for Central Valley salmonids. Intensive natural resource use in the Delta and Central Valley as a whole, combined with the listing of three local salmonid populations under the U.S. Endangered Species Act, has raised concerns about the extent to which juvenile salmonid emigration through the Delta limits survival to adult spawning. Management strategies designed to support survival of juvenile steelhead through the Delta have focused on increasing river discharge into the Delta and reducing water extraction rates during the spring emigration season. However, historical understanding of steelhead emigration survival through the Delta was based on coded wire tag studies of Chinook salmon, and thus is limited by spatial and temporal imprecision and by differences in the migratory life histories between steelhead and Chinook. Six years of acoustic tagging studies have now provided the first detailed spatiotemporal data on juvenile steelhead movement and survival through the Delta. The spatially branching nature of the river delta waterways and detection data complicates both estimation of survival performance and relating survival response to management actions. I will give an overview of various analysis methods and challenges for these data, and results from the steelhead study. Multistate release-recapture models demonstrate that survival of emigrating steelhead is an order of magnitude higher than for Chinook salmon. Fixed effects multinomial regression models show a strong relationship between steelhead survival and river discharge into the Delta, but no relationship with water extraction rates. However, strong year effects complicate model interpretation. Mixed effects models offer a possible alternative but are limited by the short time series and possible regime change during the multi-year drought.