BIO Coffee Talks: June 2018
Who: Danielle Dempsey
What: Application of neural networks for predicting changes in fish community biomass in relation to fishing and environmental indicators and comparison with a multivariate linear approach
With the increasing amount and diversity of ecological data, it is imperative to determine what should be factored into fisheries science analyses and management decisions. Here, neural networks (NNs) were used to investigate which pressures best predict changes in the fish community of the Grand Bank, Northwest Atlantic. These changes are characterized by a fish biomass collapse and partial recovery, accompanied by a shift in trophic structure. Nine indicators of fishing and environmental pressures were used to simultaneously model the biomasses of six fish functional groups for Before (1985 - 1995) and After (1996 - 2013) the collapse, and the Full period. The analysis was repeated with time delays of different lengths (0 - 10 years) and types (moving average vs. lags) imposed on the pressures. Results are compared to our previous work using multivariate linear regression. Both analyses show different influential pressures Before compared to After the collapse, while NN models generally provide better goodness of fit and require fewer predictors. NNs with lagged pressures have the potential to be useful tools for forecasting changes in the fish community.
When: Friday, June 1st, 2018
Where: 10am, King Boardroom, Bedford Institute of Oceanography, Dartmouth, Nova Scotia
What: CMOS Rehearsals!
- Guosheng Zhang: Spaceborne Synthetic Aperture Radar Applications for Tropical Cyclone Studies
- Minghong Zhang: Air-sea-ice interactions during the Great Arctic Cyclone of August 2012
- Yujuan Sun: Evaluation of the FIO-COM global ocean reanalysis: Seasonal variability of mixed layer depth in tropical oceans
- Li Zhai: Sea Level Variability during 2007-2016 in the Northeast Pacific Simulated by a High-resolution Regional Ocean Model
When: Friday, June 8, 2018
Where: 10am, George Needler Boardroom, Room VS-427, van Steenburgh Building, Bedford Institute of Oceanography, Dartmouth, Nova Scotia
Who: Dr. W. Wilson
Director, Marine Biological Association, Plymouth, United Kingdom
What: Continuous Plankton Recorder (CPR) Survey: Plankton Science for our Future Oceans
The Continuous Plankton Recorder (CPR) survey provides the global scientific and policy communities with a basin-wide and long-term measure of the ecological health of marine plankton. Using consistent and integrated methodologies, CPRs have been towed by merchant ships belonging to many nations for almost 7 million nautical miles since 1931. We have collected more than 550,000 plankton samples, primarily from the North Atlantic/North Sea but increasingly from the North Pacific and other oceans. The CPR survey is the longest running and geographically the most extensive marine ecological survey in the world. Using this historical time series and the skills of a dedicated team, the Survey provides internationally recognised scientific and policy-relevant information on environmental and climatic changes in marine ecosystems. With a focus on modernising the CPR Survey, we plan to push the boundaries of scientific endeavour using innovative monitoring tools such as state of the art instrumentation and next generation molecular biology methods; indeed the CPR is the perfect platform for large temporal and spatial genomic analysis of marine communities. Our aim is to maximise the utility of the CPR as an observing platform; although it is critical that the core CPR operation remains unchanged. In this talk I will introduce the CPR Survey, give examples of our science program and encourage you to get involved.
When: Friday, June 15, 2018
Where: 2pm, George Needler Boardroom, Room VS-427, van Steenburgh Building, Bedford Institute of Oceanography, Dartmouth, Nova Scotia
Who: Stories from the AZMP/AZOMP
What: Report on the State of the Northwest Atlantic Ocean
A summary of the data and ideas coming out of the Atlantic Zone monitoring programs in 2017 will be presented in a series of short talks. These field programs cover the shelf seas of Atlantic Canada (NL shelf, Gulf of St. Lawrence, and Scotian Shelf) and the AR7W line in the Labrador Sea. The presentations will cover mission logistics, the physical and biogeochemical data collected in 2017, and ideas that have resulted from analyses of monitoring program data.
When: Friday, June 22, 2018
Where: 10amm, George Needler Boardroom, Room VS-427, van Steenburgh Building, Bedford Institute of Oceanography, Dartmouth, Nova Scotia