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<p>Freshwater jellyfish (<i>Craspedacusta</i> spp.) are invasive hydrozoans reported throughout the world, but are likely underrepresented in public records due to sporadic appearances. This raises concerns, as freshwater jellyfish may disrupt lake communities through predation and competition. The&#xa0;potential for environmental DNA (eDNA) techniques to aid in freshwater jellyfish detection was investigated by analyzing filtered water samples and benthic cores. The eDNA methods were then compared to traditional aquatic survey methods: plankton nets (for pelagic medusae) and settlement samplers (for benthic polyps). Developing eDNA methods required evaluating genetic variability of <i>C. sowerbii,</i> a species reported as cosmopolitan. Ten lakes in the Hudson River basin (NY, USA) were sampled for freshwater jellyfish, revealing 79% positive eDNA detection with filtered water samples <i>versus</i> only 17% positive eDNA detection in sediment cores, which were more time-intensive. Genetic sequences for <i>C. sowerbii</i> analyzed herein and other recent publications form at least two distinct clades/species distributed across Eurasia and North America, which clade corresponds to nominal <i>C. sowerbii</i> remains unresolved. Results may guide biologists in monitoring freshwater jellyfish dispersal and related possible effects on aquatic food webs. Apparent diversity among Eurasian populations suggests a need for integrative studies on genetics, morphology, and ecology of <i>Craspedacusta</i> spp.</p>

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Invasive freshwater jellyfish (Craspedacusta cf. sowerbii) in the Hudson River basin, NYS: comparisons of detection methods

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Jacob P. Moore,
  • Hyatt C. Green,
  • Donald J. Stewart,
  • Florian Lüskow,
  • Maxwell L. Wilder

摘要

Freshwater jellyfish (Craspedacusta spp.) are invasive hydrozoans reported throughout the world, but are likely underrepresented in public records due to sporadic appearances. This raises concerns, as freshwater jellyfish may disrupt lake communities through predation and competition. The potential for environmental DNA (eDNA) techniques to aid in freshwater jellyfish detection was investigated by analyzing filtered water samples and benthic cores. The eDNA methods were then compared to traditional aquatic survey methods: plankton nets (for pelagic medusae) and settlement samplers (for benthic polyps). Developing eDNA methods required evaluating genetic variability of C. sowerbii, a species reported as cosmopolitan. Ten lakes in the Hudson River basin (NY, USA) were sampled for freshwater jellyfish, revealing 79% positive eDNA detection with filtered water samples versus only 17% positive eDNA detection in sediment cores, which were more time-intensive. Genetic sequences for C. sowerbii analyzed herein and other recent publications form at least two distinct clades/species distributed across Eurasia and North America, which clade corresponds to nominal C. sowerbii remains unresolved. Results may guide biologists in monitoring freshwater jellyfish dispersal and related possible effects on aquatic food webs. Apparent diversity among Eurasian populations suggests a need for integrative studies on genetics, morphology, and ecology of Craspedacusta spp.