Reconsidering evidence for potential climate‐related increases in jellyfish

Haddock, Steven H. D.

doi:10.4319/lo.2008.53.6.2759

Cited by 25 publications

(28 citation statements)

References 16 publications

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“…Reports from the North Sea suggest that increasing pCO 2 will benefit gelatinous zooplankton (Attrill et al 2007), but these conclusions are based on environmental correlation rather than experimental observations, and therefore cannot illustrate causality (Haddock 2008). Data for copepods from other parts of the world show that high pCO 2 (2000-2300 latm) did not influence survival, size, development, or egg production of Acartia steueri (Kurihara et al 2004) or of Acartia tsuensis (Kurihara and Ishimatsu 2008), but that extreme values (8000 latm) did influence development (though not growth and egg production) of Calanus finmarchicus (Mayor et al 2007).…”

Section: Zooplanktonmentioning

confidence: 99%

How will Ocean Acidification Affect Baltic Sea Ecosystems? An Assessment of Plausible Impacts on Key Functional Groups

Havenhand

2012

AMBIO

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Increasing partial pressure of atmospheric CO 2 is causing ocean pH to fall-a process known as 'ocean acidification'. Scenario modeling suggests that ocean acidification in the Baltic Sea may cause a B3 times increase in acidity (reduction of 0.2-0.4 pH units) by the year 2100. The responses of most Baltic Sea organisms to ocean acidification are poorly understood. Available data suggest that most species and ecologically important groups in the Baltic Sea food web (phytoplankton, zooplankton, macrozoobenthos, cod and sprat) will be robust to the expected changes in pH. These conclusions come from (mostly) single-species and single-factor studies. Determining the emergent effects of ocean acidification on the ecosystem from such studies is problematic, yet very few studies have used multiple stressors and/or multiple trophic levels. There is an urgent need for more data from Baltic Sea populations, particularly from environmentally diverse regions and from controlled mesocosm experiments. In the absence of such information it is difficult to envision the likely effects of future ocean acidification on Baltic Sea species and ecosystems.

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Section: Zooplanktonmentioning

confidence: 99%

How will Ocean Acidification Affect Baltic Sea Ecosystems? An Assessment of Plausible Impacts on Key Functional Groups

Havenhand

2012

AMBIO

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“…None of the previous studies (Attrill et al, 2007;Attrill & Edwards, 2008;Haddock, 2008;Gibbons & Richardson, 2009) suggested P. noctiluca as a likely contributor to the cnidarians in the 'coelenterate' tissue collected by the CPR. Doyle et al (2008) found P. noctiluca to be present in all 13 net tows randomly deployed throughout 1,815 km cruise track off the west coast of Ireland (Fig.…”

Section: Discussionmentioning

confidence: 92%

“…There are now more than 30,000 positive occurrences of coelenterates entered into the CPR database, making it an extremely valuable resource (Haddock, 2008;Gibbons & Richardson, 2009). Attrill et al (2007) found an increase in the frequency of occurrence of jellyfish ('coelenterates') in the CPR record in the North Sea from 1958 to 2000 and that it was positively associated with the North Atlantic Oscillation (NAO) and the Atlantic inflow into the North Sea.…”

Section: Introductionmentioning

confidence: 99%

“…Previous authors have speculated that the gelatinous tissue most likely to be sampled by the CPR is from the holoplanktonic hydrozoans (i.e. hydromedusae and siphonophores) because they are smaller and more abundant than scyphomedusae (Attrill et al, 2007;Haddock, 2008;Gibbons & Richardson, 2009). …”

Section: Introductionmentioning

confidence: 99%

“…comm. ); however, the siphonophore nematocysts would be counted in the general 'coelenterate' category (Haddock, 2008;Gibbons & Richardson, 2009). …”

Section: Introductionmentioning

confidence: 99%

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Identification of jellyfish from Continuous Plankton Recorder samples

et al. 2010

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Previous analysis of the Continuous Plankton Recorder (CPR) long-term data set for the presence of 'coelenterate' tissue revealed changes in the frequency of jellyfish occurrence in the North Atlantic Ocean and North Sea; however, the identities of the jellyfish were unknown, causing uncertainty in interpreting these findings. To improve the utility of the 'coelenterate' data from the CPR, 62 CPR samples were selected for re-analysis from an area where the widespread occurrence of the holoplanktonic scyphomedusan, Pelagia noctiluca (Forsskål, 1775), was previously documented from net tows to test if the CPR sampled P. noctiluca. Examination of the samples revealed smears (\1 mm) of golden gelatinous tissue on the sampling mesh. Subsequent microscopic examination and measurement of nematocysts identified most of the smears as P. noctiluca. Indeed, P. noctiluca was identified on 53% of the CPR samples from the area that best coincided with the documented bloom area. Although hydrozoans were also identified in the samples, the characteristic golden colour of P. noctiluca and its distinct suite of nematocysts allowed identification to species level. The identification of other jellyfish may be more complicated due to the labour-intensive examination of samples and unclear delineation of nematocyst types when multiple similar species are present. Nevertheless, re-analysis of CPR samples holds great promise for identifying the underlying reason for increases in jellyfish occurrence in the CPR records.

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A novel platform for monitoring gelatinous mesozooplankton: The high‐speed Gulf VII sampler quantifies gelatinous mesozooplankton similar to a ring net

Long

O’Donnell

Haberlin

et al. 2020

Limnology & Ocean Methods

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Our understanding of the distribution and abundance of gelatinous mesozooplankton (0.2-20 mm) has been largely determined from the deployment of net sampling devices. Although zooplankton nets have been shown to underrepresent the abundance of certain gelatinous taxa in comparison to data from optical systems, nets still provide relative abundances for gelatinous zooplankton. A potential source of standardized, long-term, and broad-scale data for the relative abundance and distribution of gelatinous mesozooplankton is from fisheries monitoring programs which use zooplankton samplers such as the high-speed Gulf VII sampler to capture fish eggs and larvae in shelf and offshore waters. To evaluate the use of the Gulf VII sampler as a source of gelatinous mesozooplankton data, this study collected zooplankton samples using both a Gulf VII sampler and a vertical ring net at 15 stations off the northwest Irish and Scottish coasts in July 2017. The difference in the estimates of gelatinous mesozooplankton abundance and taxon richness of the Gulf VII and the ring net samples were not significant (mean abundance: Gulf VII = 135.7 AE 79.7 ind. m −3 , ring net = 149.7 AE 66.5 ind. m −3 ; taxon richness: Gulf VII = 15.2 AE 2.4, ring net = 15.4 AE 2.5), although the Gulf VII underestimated the abundance of the appendicularian Oikopleura sp. by a factor of 9.7 when compared to the ring net. Our findings describe how added value can be provided to already existing zooplankton monitoring programs while enhancing the temporal and spatial coverage of data available for gelatinous mesozooplankton.

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Reconsidering evidence for potential climate‐related increases in jellyfish

Cited by 25 publications

References 16 publications

How will Ocean Acidification Affect Baltic Sea Ecosystems? An Assessment of Plausible Impacts on Key Functional Groups

How will Ocean Acidification Affect Baltic Sea Ecosystems? An Assessment of Plausible Impacts on Key Functional Groups

Identification of jellyfish from Continuous Plankton Recorder samples

A novel platform for monitoring gelatinous mesozooplankton: The high‐speed Gulf VII sampler quantifies gelatinous mesozooplankton similar to a ring net

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