20.500.12556/DiRROS-21762 Recurrent jellyfish blooms are a consequence of global oscillations A perceived recent increase in global jellyfish abundance has been portrayed as a symptom of degraded oceans. This perception is based primarily on a few case studies and anecdotal evidence, but a formal analysis of global temporal trends in jellyfish populations has been missing. Here, we analyze all available long-term datasets on changes in jellyfish abundance across multiple coastal stations, using linear and logistic mixed models and effect-size analysis to show that there is no robust evidence for a global increase in jellyfish. Although there has been a small linear increase in jellyfish since the 1970s, this trend was unsubstantiated by effect-size analysis that showed no difference in the proportion of increasing vs. decreasing jellyfish populations over all time periods examined. Rather, the strongest nonrandom trend indicated jellyfish populations undergo larger, worldwide oscillations with an approximate 20-y periodicity, including a rising phase during the 1990s that contributed to the perception of a global increase in jellyfish abundance. Sustained monitoring is required over the next decade to elucidate with statistical confidence whether the weak increasing linear trend in jellyfish after 1970 is an actual shift in the baseline or part of an oscillation. Irrespective of the nature of increase, given the potential damage posed by jellyfish blooms to fisheries, tourism, and other human industries, our findings foretell recurrent phases of rise and fall in jellyfish populations that society should be prepared to face. meduze globalna distribucija razmnoževanje polipi globalna nihanja umentni podvodni habitati true false true Angleški jezik Slovenski jezik Neznano 2025-03-26 09:26:40 2025-03-26 09:26:40 2025-10-24 03:49:45 0000-00-00 00:00:00 2013 0 0 str. 1000-1005 no. 3 Vol. 110 2013 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2013-01-15 574 0027-8424 10.1073/pnas.1210920110 2703695 http://www.pnas.org/content/early/2012/12/26/1210920110.full.pdf+html 1 0cbd04e9-0a1c-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31345 RAZ_Condon_Robert_H._2013.pdf RAZ_Condon_Robert_H._2013.pdf 1 AAD48021950D08460960DD9AAA9BD035 ffb8321e23ca75c6665b0e33c8d50732cc9da0da4d6e2b2468f0188ab62b7c55 8847b23a-0a1c-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31346 https://doi.org/10.1073/pnas.1210920110 0 91848eda-0a1c-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31347 Nacionalni inštitut za biologijo 0 0 0