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<p>After 1970s, polychlorinated dibenzodioxins and dibenzofurans (PCDD/Fs) concentrations peak in Baltic biota, concentrations started to decline following environmental legislation. However, in common guillemot eggs, this decline plateaued in 1990s, despite continued emissions reductions. Here, we test whether these contrasting trends can be explained by environmental and food web structural changes, including prey availability. Analysing temporal variation in the Central Baltic offshore fish community, including guillemot prey, we identified three structural phases: cod and herring dominance (1976–1986), sprat dominance (1987–2001), and stickleback population increase (2002–2021). We linked them with corresponding phases in PCDD/F trends: a steep decline (− 6.4% yr<sup>−1</sup>), a plateau (0.27% yr<sup>−1</sup>), and a slower decline (− 3.8% yr<sup>−1</sup>). Fish community structure shifts were driven by changes in temperature, salinity, zooplankton size, and fishing pressure. We concluded that climate- and human-driven structural changes in food webs cascaded through trophic levels, affecting PCDD/F concentrations in guillemot eggs.</p>

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The effect of shifts in fish community structure on PCDD/F temporal variability in common guillemot (Baltic Sea)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月3日

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  • Yosr Ammar,
  • Jens Olsson,
  • Elena Gorokhova,
  • Martin Sköld,
  • Suzanne Faxneld,
  • Jonas Hentati-Sundberg,
  • Anne L. Soerensen

摘要

After 1970s, polychlorinated dibenzodioxins and dibenzofurans (PCDD/Fs) concentrations peak in Baltic biota, concentrations started to decline following environmental legislation. However, in common guillemot eggs, this decline plateaued in 1990s, despite continued emissions reductions. Here, we test whether these contrasting trends can be explained by environmental and food web structural changes, including prey availability. Analysing temporal variation in the Central Baltic offshore fish community, including guillemot prey, we identified three structural phases: cod and herring dominance (1976–1986), sprat dominance (1987–2001), and stickleback population increase (2002–2021). We linked them with corresponding phases in PCDD/F trends: a steep decline (− 6.4% yr−1), a plateau (0.27% yr−1), and a slower decline (− 3.8% yr−1). Fish community structure shifts were driven by changes in temperature, salinity, zooplankton size, and fishing pressure. We concluded that climate- and human-driven structural changes in food webs cascaded through trophic levels, affecting PCDD/F concentrations in guillemot eggs.