Estuaries and Coasts
It is widely assumed that phytoplankton abundance and productivity decline during temperate winters because of low irradiance and temperatures. However, winter phytoplankton blooms commonly occur in temperate estuaries, but they are often undocumented because of reduced water quality monitoring in winter. The small body of in situ work that has been done on winter blooms suggests they can be of enormous consequence to ecosystems. However, because monitoring is often reduced or stopped altogether during winter, it is unclear how widespread these blooms are or how long they can last. We analyzed an over 30-year record of monthly phytoplankton monitoring samples along with ad hoc sampling throughout Chesapeake Bay to assess the distributions of two common winter bloom species, Heterocapsa rotundata and Heterocapsa steinii, and the environmental conditions associated with these blooms. The long-term monitoring data revealed that H. rotundata blooms occur within a narrow salinity range (7–12) and potentially have different triggers depending upon the nutrient status of waters affected. The ad hoc sampling confirmed the occurrence of H. steinii blooms in the lower Chesapeake Bay, despite the lack of evidence for them from monthly monitoring data. Together, our findings demonstrate that winter blooms routinely occur in numerous locations throughout Chesapeake Bay and can last up to a month. Our findings suggest that while winter blooms are a staple of the Bay’s annual phytoplankton community, there are major data gaps reporting their occurrence highlighting the need for more frequent monitoring to understand factors promoting these blooms and their consequences on ecosystem productivity.
This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
Article states: "The majority of the data presented here was downloaded from the Chesapeake Bay Project Datahub, a publicly available dataset of plankton and water quality data for the Bay. Additional data for the Choptank River and Elizabeth River are available through the dissertation "Ecosystem Impact of Winter Dinofagellate Blooms in the Choptank River, MD" in the Digital Repository at the University of Maryland and the Ecotaxa repository, respectively."
Original Publication Citation
Millette, N. C., Clayton, S., Mulholland, M. R., Gibala-Smith, L., & Lane, M. (2023). The importance of winter dinoflagellate blooms in Chesapeake Bay—a missing link in bay productivity. Estuaries and Coasts, 46(4), 986-997. https://doi.org/10.1007/s12237-023-01191-0
Millette, Nicole C.; Clayton, Sophie; Mulholland, Margaret R.; Gibala-Smith, Leah; and Lane, Michael, "The Importance of Winter Dinoflagellate Blooms in Chesapeake Bay— A Missing Link in Bay Productivity" (2023). OES Faculty Publications. 478.
0000-0001-7473-4873 (Clayton), 0000-0001-8819-189X (Mulholland),