Revealing the Red: Peridinium Blooms in Lake Kinneret

Uncovering a Red-Tide-Like Phenomenon in Lake Kinneret

Each spring, blooms of the dinoflagellate Peridinium gatunense in Lake Kinneret can grow intense enough to rival red tides. The blooms are strikingly uneven in space and follow a daily vertical migration — drifting toward the surface by day and descending into deeper water at night. Seen from the shore, the population clusters into patches ranging from hundreds of meters to several kilometers across, showing up as coffee-brown bands against the surrounding blue water.

Lake Kinneret research scene illustrating Peridinium bloom studies — Studying Peridinium blooms in Lake Kinneret

Tracking the Bloom by Satellite

Remote sensing from satellites lets researchers see and measure the Peridinium bloom. The Satellite-based Information System on Coastal Areas and Lakes (SISCAL), started and run by Dr. Gideon Tibor of NIO-IOLR, worked through the satellite imagery and distribution data. Those results helped map the lake's relative chlorophyll distribution, which tracks the developed Peridinium population.

Why These Blooms Matter

For years, the spring Peridinium blooms were seen as an indicator of ecosystem stability and water quality in the lake. Dinoflagellates play a central role in the marine food web, but when blooms thicken to red-tide proportions they can damage marine life and carry toxins into animals meant for human consumption. The seasonal blooms have fluctuated widely over the past decade: spring populations were substantially lower in 2000, 2001, 2005, 2006 and 2008, while 2003, 2004 and 2007 produced normal and at times very dense blooms. KLL scientists study these events closely — why they break off, and what biological traits drive them.

Fieldwork on the 2007 Bloom

KLL scientists mounted a comprehensive study of the spring 2007 bloom, coordinated by IOLR scientist Dr. Assaf Sukenik. Over three straight days and nights in the final week of March 2007, the team followed the spatial distribution and shifting dynamics of the Peridinium population in northern Lake Kinneret. Their goal was to describe the patchy character of the blooms and to pinpoint and measure the physical and biological processes that create it.

The extensive dataset from the expedition reveals quantitative links between the size of the Peridinium population and how much Jordan River water flood events dilute into the lake. Satellite images and earlier research showed that the patches form mainly in the northern lake area where the Jordan River enters — pointing to this zone as the place where the population develops and grows, nourished by nutrients and chemical conditions carried in with the river inflow. The developed population then spreads outward along the Jordan River plume.

Using this unique database, KLL scientists suggest that a water mass enriched with Peridinium detaches from the hatching and nursing zone at the river inlet and then migrates through the lake along existing waves, currents and streams. The patch migration follows the Jordan River trail, from the northern emergence area down the northwest coast toward the lake center — a pattern consistent with a Lake Kinneret circulation simulation model run by Dr. Alon Rimer of KLL. On the strength of that model, the scientists speculate that migrating patches may differ from one another in age or developmental stage. Once again, the study showed the Kinneret Limnological Laboratory's capacity to identify crucial aspects of the lake ecosystem and to investigate them collaboratively, deepening understanding of trends and changes.

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Together, satellite observation and intensive field campaigns give researchers a fuller picture of how Peridinium populations form, drift and disperse across Lake Kinneret. By connecting bloom patterns to river inflow, currents and circulation models, the work helps scientists interpret year-to-year shifts in the lake's spring blooms.

Revealing the Red