Biological structure in a shallow cove (Kertinge Nor, Denmark) — Control by benthic nutrient fluxes and suspension-feeding ascidians and jellyfish

Riisgård, Hans Ulrik; Christensen, Peter Bondo; Olesen, N. J.; Petersen, J. K.; Möller, Marco; Andersen, Per

doi:10.1080/00785236.1995.10422051

Cited by 58 publications

(26 citation statements)

References 16 publications

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“…Thus, in the shallow cove of Kertinge Nor, the maximum diameter of the umbrella is usually only 3 to 4 cm, although high abundances of such small jellyfish (up to 300 ind. m -3 ) control the zooplankton biomass (Olesen et al 1994, Riisgård et al 1995, Frandsen & Riisgård 1997. A similar situation has been described for Horsea Lake, England (Lucas & Lawes 1998).…”

Section: Growth and Predation Impactmentioning

confidence: 69%

Population dynamics, growth and predation impact of the common jellyfish Aurelia aurita and two hydromedusae, Sarsia tubulosa, and Aequorea vitrina in Limfjorden (Denmark)

Møller¹,

Riisgård²

2007

Mar. Ecol. Prog. Ser.

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Section: Growth and Predation Impactmentioning

confidence: 69%

Population dynamics, growth and predation impact of the common jellyfish Aurelia aurita and two hydromedusae, Sarsia tubulosa, and Aequorea vitrina in Limfjorden (Denmark)

Møller¹,

Riisgård²

2007

Mar. Ecol. Prog. Ser.

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“…These organisms have very similar clearance rates and as such food competition may be substantial (Petersen 2007). Similarly, in oyster aquaculture, tunicates compete for phytoplankton, causing reduced growth (Rissga˚rd et al 1995). In addition to food competition, shellfish may experience competition for space and are particularly vulnerable to interference competition from overgrowth.…”

Section: Biological Competitionmentioning

confidence: 99%

The impact and control of biofouling in marine aquaculture: a review

et al. 2012

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Biofouling in marine aquaculture is a specific problem where both the target culture species and/or infrastructure are exposed to a diverse array of fouling organisms, with significant production impacts. In shellfish aquaculture the key impact is the direct fouling of stock causing physical damage, mechanical interference, biological competition and environmental modification, while infrastructure is also impacted. In contrast, the key impact in finfish aquaculture is the fouling of infrastructure which restricts water exchange, increases disease risk and causes deformation of cages and structures. Consequently, the economic costs associated with biofouling control are substantial. Conservative estimates are consistently between 5-10% of production costs (equivalent to US$ 1.5 to 3 billion yr 71 ), illustrating the need for effective mitigation methods and technologies. The control of biofouling in aquaculture is achieved through the avoidance of natural recruitment, physical removal and the use of antifoulants. However, the continued rise and expansion of the aquaculture industry and the increasingly stringent legislation for biocides in food production necessitates the development of innovative antifouling strategies. These must meet environmental, societal, and economic benchmarks while effectively preventing the settlement and growth of resilient multi-species consortia of biofouling organisms.

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“…When jellyfish occur in high numbers, their collective prey-consumption rate can be so high that this predation directly or indirectly controls the population size of other zooplankton organisms (Huntley & Hobson 1978, Feigenbaum & Kelly 1984, Baird & Ulanowicz 1989, Matsakis & Conover 1991, Purcell 1992, Schneider & Behrends 1994, Olesen 1995, Riisgård et al 1995, Nielsen et al 1997 including fish (Möller 1984, Øiestad 1985, Purcell & Grover 1990. Intense predation by jellyfish on certain prey can cause a shift in the trophic structure of the pelagic community as a result of trophic cascading (Behrends & Schneider 1995, Schneider & Behrends 1998, Stibor et al 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Riisgård et al 1995) of a prey organism before being captured by a jellyfish was calculated from mortality rate (μ, d -1 ) as:…”

Section: Introductionmentioning

confidence: 99%

Clearance rates of jellyfish and their potential predation impact on zooplankton and fish larvae in a neritic ecosystem (Limfjorden, Denmark)

Hansson¹,

Moeslund²,

Kiørboe³

et al. 2005

Mar. Ecol. Prog. Ser.

127

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Clearance rates of the hydromedusae Sarsia tubulosa, Rathkea octopunctata and Bougainvillea superciliaris and the scyphomedusa Aurelia aurita were measured in the laboratory. Gut contents analyses of A. aurita were also collected in situ and subsequently used for estimation of clearance rate. The clearance rate of A. aurita varied widely with prey organisms. Large crustacean prey with low escape capabilities (Artemia salina nauplii and cirripede larvae) were cleared at high rates, whereas copepodites were cleared at lower rates, and clearance rates of small bivalve larvae and copepod nauplii were comparatively low. These data were used to assess the impact of jellyfish predation upon zooplankton and fish larvae in Limfjorden, Denmark. Repeated sampling of zooplankton, fish larvae and medusae was undertaken during the first half of 2003. Nine taxa of hydromedusae and 4 taxa of scyphomedusae were identified. Abundance estimates were combined with estimated clearance rates of individual medusae to calculate potential jellyfish-induced mortality on prey in Limfjorden. Copepoda was used as a model prey group to estimate the collective predation impact by all medusae. Medusa species with unknown clearance potential were given assumed clearance rate values, but the collective predation potential by these species was evaluated to be small. Hydromedusae dominated numerically and had their highest potential clearance impact in spring, but overall jellyfish clearance potential on copepods was low during this period. From May A. aurita was the most abundant jellyfish and the potential jellyfish predation impact became totally dominated by this scyphomedusa. Clearance potential was locally high on some prey, and predation by A. aurita probably controlled the abundance of cirripede larvae and fish larvae in Limfjorden. For these prey groups, half-life expectancy was less than 1 d at several locations. Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 304: [117][118][119][120][121][122][123][124][125][126][127][128][129][130][131] 2005 der 1989, Olsson et al. 1992, Purcell & Nemazie 1992, Purcell et al. 1994, Brodeur et al. 2002.It has been suggested that jellyfish predation might be an important factor shaping the pelagic ecosystem structure in Limfjorden. The waters of Limfjorden have been targeted as a fishing area since prehistoric times. However, between 1981 and 1996 the landings of edible fish such as eel, plaice and cod were severely reduced (Dolmer & Frandsen 2002), and one of the locally raised hypotheses was that the reduced landings might have been due to jellyfish. Interest in the possible effects of jellyfish predation on fish eggs and fish larvae motivated the local county authorities to finance a survey of fish and jellyfish in Limfjorden. The survey was conducted in spring months from 1996 to 1999 by a consulting company (Bio/consult 2001). In total, 10 taxa of medusae were identified, and a high spatial and temporal variation in jellyfish density was ...

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Biological structure in a shallow cove (Kertinge Nor, Denmark) — Control by benthic nutrient fluxes and suspension-feeding ascidians and jellyfish

Cited by 58 publications

References 16 publications

Population dynamics, growth and predation impact of the common jellyfish Aurelia aurita and two hydromedusae, Sarsia tubulosa, and Aequorea vitrina in Limfjorden (Denmark)

Population dynamics, growth and predation impact of the common jellyfish Aurelia aurita and two hydromedusae, Sarsia tubulosa, and Aequorea vitrina in Limfjorden (Denmark)

The impact and control of biofouling in marine aquaculture: a review

Clearance rates of jellyfish and their potential predation impact on zooplankton and fish larvae in a neritic ecosystem (Limfjorden, Denmark)

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