A Tropical Tale: Influence of the Warm Blob on the Planktic Foraminifera Community off the Oregon Coast
This study describes the planktic foraminifera community found in a cross-shelf transect off the Oregon coast (44.6°N) during the Warm Blob years (2014-2016.) Samples were collected from plankton tows along the Newport Hydrographic Line, an ongoing 20+ year time series of hydrographic and biological sampling. Foraminifera assemblages naturally shift with warm and cold water events that occur on various temporal scales, driven by the El Niño Southern Oscillation, the Pacific Decadal Oscillation, and seasonal upwelling. However, during the Warm Blob years, tropical species were found in high abundance and closer nearshore compared to a historical foraminiferal assemblage record from this region. We also compared the Warm Blob species assemblages to more recently collected plankton tows (2018 and 2019) which represented a more typical cold-water assemblage following the Warm Blob. The Warm Blob represents a unique anomaly off the coast of Oregon that is well-recorded in the foraminiferal record. Foraminifera could provide insight in to the paleorecord of warm water events along the Oregon Coast.