Evidence for impacts by jellyfish on North Sea herring recruitment

Lynam, Christopher P.; Heath, Michael R.; Hay, Stephen; Brierley, Andrew S.

doi:10.3354/meps298157

Cited by 123 publications

(72 citation statements)

References 32 publications

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“…Meanwhile, the medusae compete with some small planktivorous fish for the same zooplankton prey (Purcell and Arai, 2001;Richardson et al, 2009). Therefore, some studies suggested that overfishing might help facilitate the jellyfish outbreaks (Purcell et al, 2007;Lynam et al, 2005Lynam et al, , 2006Richardson et al, 2009). Changes in marine fishery catches in Chinese coastal regions over the last two decades are shown in Fig.…”

Section: Overfishingmentioning

confidence: 99%

Jellyfish blooms in China: Dominant species, causes and consequences

Dong

Chen

Keesing

2010

Marine Pollution Bulletin

340

193

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Section: Overfishingmentioning

confidence: 99%

Jellyfish blooms in China: Dominant species, causes and consequences

Dong

Chen

Keesing

2010

Marine Pollution Bulletin

340

193

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“…Lynam et al 2005;Malej et al 2007;Purcell et al 2010). Individuals were collected from a pontoon located at the southern extreme of Strangford Lough (a large coastal embayment Xowing into the Irish Sea) near the Queen's University Marine Laboratory (54 o 22Ј44.73ЉN, 5 o 32Ј53.44ЉW; Co. Down, Northern Ireland) during May 2009.…”

Section: Methodsmentioning

confidence: 99%

Preservation methods alter stable isotope values in gelatinous zooplankton: implications for interpreting trophic ecology

et al. 2011

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JellyWsh are increasingly topical within studies of marine food webs. Stable isotope analysis represents a valuable technique to unravel the complex trophic role of these long-overlooked species. In other taxa, sample preservation has been shown to alter the isotopic values of species under consideration, potentially leading to misinterpretation of trophic ecology. To identify potential preservation eVects in jellyWsh, we collected Aurelia aurita from Strangford Lough (54 o 22Ј44.73ЉN, 5 o 32Ј53.44ЉW) during May 2009 and processed them using three diVerent methods prior to isotopic analysis (unpreserved, frozen and preserved in ethanol). A distinct preservation eVect was found on 15 N values: furthermore, preservation also inXuenced the positive allometric relationship between individual size and 15 N values. Conversely, 13 C values remained consistent between the three preservation methods, conXicting with previous Wndings for other invertebrate, Wsh and mammalian species. These Wndings have implications for incorporation of jellyWsh into marine food webs and remote sampling regimes where preservation of samples is unavoidable.

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“…Because medusae can consume fish eggs and larvae, they have been shown to exert, at high densities, a top-down effect on pelagic fish recruitment through direct predation as well as competition for zooplankton (Möller 1984, Lynam et al 2005). In the NB, the main spawning area for sardines on the shelf in the north central part of the ecosystem (Kreiner et al 2011) overlaps considerably with the region of highest jellyfish abundance, between 20°S and 24°S (Flynn et al 2012).…”

Section: The Role Of Small Pelagic Fishes and What Canmentioning

confidence: 99%

Jellyfication of Marine Ecosystems as a Likely Consequence of Overfishing Small Pelagic Fishes: Lessons from the Benguela

Roux¹,

Lingen²,

Gibbons³

et al. 2013

BMS

128

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Changes in two contrasting ecosystems of the Benguela upwelling region, one dominated at mid-trophic level by jellyfishes (Namibia, northern Benguela ecosystem, where small pelagic fish abundance has been severely depleted) and one still dominated by small pelagic fishes (South Africa, southern Benguela) were compared in an effort to determine ecosystem trajectories under different exploitation regimes. The role of small pelagic fishes (clupeoids) was highlighted in the context of their importance in maintaining interactions in marine ecosystems. In particular, we examined trophic cascades and possible irreversible changes that promote the proliferation of jellyfishes in marine systems. We found that the presence of large populations of small pelagic fishes has a fundamental role in preserving beneficial trophic interactions in these marine ecosystems. The implications of trophic cascades, such as those observed in the northern Benguela, for ecosystem-based management were apparent. In addition, this comparison provides contrasting case studies to inform the development of management scenarios that avoid ecosystem shifts that affect predators and reduce the value of fisheries production.

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Evidence for impacts by jellyfish on North Sea herring recruitment

Cited by 123 publications

References 32 publications

Jellyfish blooms in China: Dominant species, causes and consequences

Jellyfish blooms in China: Dominant species, causes and consequences

Preservation methods alter stable isotope values in gelatinous zooplankton: implications for interpreting trophic ecology

Jellyfication of Marine Ecosystems as a Likely Consequence of Overfishing Small Pelagic Fishes: Lessons from the Benguela

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