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New Study Charts Invasive Sea Walnut’s Niche in Venice Lagoon as Warming Raises Risk

The first integrated field–lab analysis finds wide tolerance across temperature and salinity with seasonal reproduction peaks.

Overview

  • Researchers from the University of Padova and Italy’s OGS published the first combined field‑and‑laboratory profile of Mnemiopsis leidyi in Estuarine, Coastal and Shelf Science.
  • Experiments and in situ surveys show survival across 10–32 °C and salinity 10–34, with extreme heat or very low salinity reducing survival.
  • The ctenophore displays mass‑reproduction pulses in late spring and again from late summer into early autumn, likely tied to warmer water and favorable salinity.
  • Present in the Adriatic for about a decade, the species is likely to become a stable resident in the Venice Lagoon with potential to disrupt plankton and fish recruitment.
  • Authors warn that climate change could foster larger aggregations and urge monitoring and adaptive management to limit ecological and socio‑economic impacts.