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Area of Science:

  • Marine Biology
  • Ecology
  • Climate Change Research

Background:

  • The "decline effect" refers to the tendency for findings in scientific literature to become weaker or less significant over time.
  • Ocean acidification, caused by increased atmospheric CO2 absorption by seawater, poses a significant threat to marine ecosystems, particularly fish.
  • Previous analyses have debated the existence and extent of the decline effect in fish ocean acidification studies.

Purpose of the Study:

  • To re-examine the claim that there is no extreme decline effect in fish ocean acidification studies.
  • To identify the primary drivers of the observed decline effect in this research field.
  • To critically assess the influence of specific studies and authors on the overall trend.

Main Methods:

  • A critical re-analysis of existing data from fish ocean acidification studies.
  • Statistical examination of publication trends and effect sizes.
  • Identification and evaluation of outlier data points and their sources.

Main Results:

  • The re-analysis indicates that extreme data, particularly from early studies by Dixson and Munday, significantly contribute to an "extreme" decline effect.
  • The decline effect in fish ocean acidification research is not a general phenomenon but is disproportionately driven by a few specific, highly influential papers.
  • Certain authors' publications appear to be the primary source of the extreme effect sizes reported in the field.

Conclusions:

  • The decline effect in fish ocean acidification studies is demonstrably present and influenced by specific, extreme data points.
  • The field's conclusions are potentially skewed by the impact of a limited number of studies.
  • Further investigation into publication bias and data reporting practices is warranted to ensure the robustness of scientific findings in this area.