I'm a PhD student in the
Johnson lab
at the University of Colorado, Boulder. My research focuses on the role of parasites and disease in marine ecosystems.
Educational Background
- M.S. College of William & Mary (VIMS)
- B.S. Cornell University
- A.A. Bard Early College
Contact Information
- anna.poslednik@colorado.edu
- Google Scholar
Map of University of Colorado, Boulder
Climate Analysis
Patterns in annual snowfall at JFK Airport, NYC have not changed over time.
The interactive plot above is a great way to see which specific days had high snowfall in NYC. The highest peak of snowfall (30.3 inches) on January 23, 2016 broke records and resulted in 13,000 flight cancellations that week.
The above graph provides annual average snowfall at JFK airport. The highest average snowfall occured in 2003 (0.17 inches), while 1973 and 2023 had the lowest annual average (0.006 in). No obvious linear trends are present in the above graph, and there is a lot of variability in the average annual snowfall from year to year. There is a suggestion in the graph that there are more extreme snowfall years (more high peaks) after 1990 vs before 1990, however further statistical analysis is needed. Because many daily values were 0, annual averages of snowfall may not be the most informative when analyzing changes in climate for this region. However, understanding how snowfall is changing over time at different locations around the world will provide more insight into the effects of climate change both locally and globally, as well as determine whether cyclic patterns exist in snowfall across decadal time scales.
Link to full notebook analysis
Data citation: Menne, Matthew J., Imke Durre, Bryant Korzeniewski, Shelley McNeill, Kristy Thomas, Xungang Yin, Steven Anthony, Ron Ray, Russell S. Vose, Byron E.Gleason, and Tamara G. Houston (2012): Global Historical Climatology Network - Daily (GHCN-Daily), Version 3. JFK Airport, NY (station: USW00094789). NOAA National Climatic Data Center. doi:10.7289/V5D21VHZ 23 Sept 2024.
Osprey Migration Analysis
Osprey exhibit a global distribution with migrations to the North in spring and summer months.
This interactive plot depicts the occurrence observations of osprey across the months of 2023. Osprey have a global distribution, generally found around coasts and waterways, which is most clearly illustrated in Australia in the map above. Osprey begin to be observed at higher frequencies at Northern latitudes in April, and migrate towards equitorial regions beginning in September and October. The large-scale migrations of osprey suggest that osprey may be spreading parasites, particularly trematodes (flatworms) of fish, massive distances which could frustrate management of any diseases these parasites may cause to fish and other intermediate hosts.
Link to notebook writeup Link to data download and analysis
Data citation: Global Biodiversity Information Facility. (2024). GBIF Occurrence Download [Data set]. https://doi.org/10.15468/dl.jqrwjf
RESOLVE. (2017). RESOLVE Ecoregions dataset [Data set]. https://doi.org/10.1093/biosci/bix014