2016
DOI: 10.1002/ecs2.1324
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Evidence that summer jellyfish blooms impact Pacific Northwest salmon production

Abstract: Interannual variability in salmon (Oncorhynchus spp.) production in the northeast Pacific is understood to be driven by oceanographic variability and bottom‐up processes affecting prey availability to juvenile salmon. Scyphozoan jellyfish have an important role in shaping the pathways of energy flow through pelagic food webs. While jellyfish obtain high production rates and biomasses as major consumers of zooplankton production, they have few predators and may divert plankton production away from higher trophi… Show more

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Cited by 25 publications
(21 citation statements)
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References 43 publications
(61 reference statements)
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“…They can exert substantial top‐down pressure on prey species, and on occasion, intense blooms of particular species can cause a trophic cascade, transforming an entire ecosystem into a less desirable state, at least from a human perspective (Greve ; Kideys and Romanova ; Kideys ). Just as important is the role of gelatinous zooplankton as competitors, whereby their rapid growth potentially allows them to outcompete planktivorous fish species (Brodeur et al ; Ruzicka et al ). It is also increasingly apparent that gelatinous zooplankton are consumed by a substantial number of marine predators (Hays et al ), including a large number of important commercial fish species (Arai ; Purcell and Arai ; Lamb et al ).…”
mentioning
confidence: 99%
“…They can exert substantial top‐down pressure on prey species, and on occasion, intense blooms of particular species can cause a trophic cascade, transforming an entire ecosystem into a less desirable state, at least from a human perspective (Greve ; Kideys and Romanova ; Kideys ). Just as important is the role of gelatinous zooplankton as competitors, whereby their rapid growth potentially allows them to outcompete planktivorous fish species (Brodeur et al ; Ruzicka et al ). It is also increasingly apparent that gelatinous zooplankton are consumed by a substantial number of marine predators (Hays et al ), including a large number of important commercial fish species (Arai ; Purcell and Arai ; Lamb et al ).…”
mentioning
confidence: 99%
“…This may be attributed to predation upon larval herring or to competition with larval herring for zooplankton (Lynam et al 2005). In the NCC, high local abundances of the jellyfish Chrysaora fuscesens are associated with poor feeding conditions for juvenile salmon Oncorhynchus spp., as evidenced by less food in salmon stomachs in the presence of jellyfish blooms (Ruzicka et al 2016). Even smaller juvenile salmon do not themselves prey heavily upon zooplankton within the NCC.…”
Section: Discussionmentioning
confidence: 99%
“…Accurately forecasting the number of returning adult fish is essential for establishing a sustainable fishery. Adult Chinook salmon return values are from Ruzicka et al (2016), who back-calculated annual returns of adult Chinook salmon to Bonneville Dam (http://www.cbr.washington.edu/dart/) to include both 2-and 3-yr returns. The adult return value for 2011 was 3.4 standard deviations above the long-term mean and was not included in the analysis.…”
Section: Discussionmentioning
confidence: 99%
“…Four-month (May through August) averages of oceanographic variables and adult returns fromRuzicka et al (2016) used in the regression analyses by year. See Methods for explanation of variables and their sources, see text.…”
mentioning
confidence: 99%