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Salinity and temperature increase impact groundwater crustaceans.

Andrea Castaño-Sánchez1, Grant C Hose2, Ana Sofia P S Reboleira3

  • 1Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100, Copenhagen, Denmark.

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Groundwater invertebrates face significant threats from rising temperatures and salinity due to climate change. These environmental changes risk the loss of specialized species in these unique ecosystems.

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Area of Science:

  • Ecology
  • Environmental Science
  • Climate Change Biology

Background:

  • Groundwater ecosystems harbor specialized species but are vulnerable to anthropogenic impacts.
  • Climate change and groundwater salinization pose significant threats to these unique habitats, particularly in arid regions.
  • Global warming exacerbates salinization, increasing risks to groundwater biodiversity.

Purpose of the Study:

  • To assess the temperature and salinity tolerance of groundwater-adapted invertebrates.
  • To understand the combined effects of global warming and salinization on groundwater ecosystems.
  • To evaluate the risk to endemic Australian groundwater crustaceans.

Main Methods:

  • Tested tolerance limits of representative groundwater crustaceans (copepods and syncarids) to temperature and salinity.
  • Measured mortality rates after 96 hours exposure to varying NaCl concentrations and temperature increases.
  • Calculated salinity risk quotients and predicted population loss under future climate scenarios.

Main Results:

  • 50% population mortality occurred between 2.84–7.35 g NaCl/L.
  • Copepods experienced 50% mortality at 6.9 °C above ambient, while syncarids tolerated up to 10 °C increase.
  • Copepods exhibited higher sensitivity to both temperature and salinity compared to syncarids.

Conclusions:

  • Increased salinity and temperature pose a substantial risk to the ecological integrity of groundwater ecosystems.
  • A salinity risk quotient of 9.7 was calculated, indicating significant risk.
  • Under worst-case scenarios for 2070, a 10% loss of syncarid and 20% loss of copepod populations are predicted.