Food intake and growth of Sarsia tubulosa (SARS, 1835), with quantitative estimates of predation on copepod populations

Daan, R.

doi:10.1016/0077-7579(86)90062-1

Cited by 54 publications

(38 citation statements)

References 9 publications

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“…Percentage of ingested prey composition from comparative studies from the northwest Pacific, North America containing relevant hydromedusan dietary data. Source locations for the data were Saanich Inlet, Canada (Larson 1987a), variable locations ranging from Friday Harbor, WA, to southern British Columbia (Purcell and Mills 1988), Vancouver Island, Canada (Purcell 1990), Friday Harbor, WA, region (Mills 1995;this study Purcell and Mills (1988) This study Purcell (1990) Purcell andMills (1988) This study Purcell (1990) Mills (1995 This study result, studies that have carefully quantified the predatory impact of hydromedusae on copepods have concluded that, under most field conditions, hydromedusae do not exert significant predatory impact on copepod populations (Daan 1986). The predatory impact of the flow-based medusan guild focused on the soft-bodied fraction of the zooplankton.…”

Section: Implications Of Hydromedusan Dietary Niche Patterns Formentioning

confidence: 88%

Prey resource use by coexistent hydromedusae from Friday Harbor, Washington

Costello

Colin

2002

Limnology & Oceanography

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Prey selection patterns were quantified for a sympatric group of hydromedusae from Friday Harbor, WA. Selection patterns varied between species, but were largely replicable between sample dates and resembled dietary patterns found in similar studies from neighboring regions. Ambush-foraging medusae (Aglantha digitale, Sarsia tubulosa, and Proboscidactyla flavicirrata) fed primarily on crustacean and ciliated prey but the dietary niches of these hydromedusan species centered on different fractions of the available plankton. Consequently, little dietary overlap occurred between the ambush foraging hydromedusae. In contrast, the dietary niches of cruising predators (Aequorea victoria, Mitrocoma cellularia, and Phialidium gregarium) overlapped substantially because those species all fed on similar soft-bodied prey such as eggs and appendicularians. These results have two important implications for trophic patterns involving medusae. First, different mechanisms of prey encounter and capture used by hydromedusae (ambush vs. cruising patterns) result in important interspecific dietary differences and, hence, trophic roles of the medusae. Second, whereas cruising medusae may consume similar prey and hence form a feeding guild, ambush-foraging medusae may experience substantially less prey overlap and, for the community examined here, do not experience potentially strong feeding competition from other medusan species.Predation by hydromedusae can substantially affect prey populations of zooplankton (Larson 1987a; Matsakis and Conover 1991) and fish eggs or larvae (Purcell et al. 1987, Purcell andGrover 1990). Although hydromedusae prey on a wide spectrum of planktonic taxa, many hydromedusan species appear to selectively consume particular prey types (Larson 1987a;Purcell 1990;Mills 1995) via a variety of mechanisms (reviewed in Purcell 1997).Full understanding of the predatory impacts of hydromedusan predation requires information on the synergistic impacts of multiple species of coexisting hydromedusae. This is important because hydromedusan species often coexist (Mills 1981a), and the trophic impacts of sympatric species do not occur in isolation from one another. The use of similar, potentially limiting prey (Purcell 1991a) suggests that these species may experience competition for planktonic prey resources. Differential prey selection patterns by hydromedusae (Larson 1987a;Purcell 1990;Mills 1995) could help relieve intraguild competition among medusae, but the trophic niches of species comprising hydromedusan guilds have received little attention. We asked whether, first, prey resource partitioning occurred between sympatric hydromedusae and, second, what patterns were identifiable that would affect the dietary interactions of species comprising hydromedusan feeding guilds.We chose a group of sympatric hydromedusae ( Fig. 1) from waters surrounding Friday Harbor Laboratories for our 1 Corresponding author. AcknowledgementsFunding for this project was provided by NSF grants OCE 9218507 and OCE-9820172 to ...

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Section: Implications Of Hydromedusan Dietary Niche Patterns Formentioning

confidence: 88%

Prey resource use by coexistent hydromedusae from Friday Harbor, Washington

Costello

Colin

2002

Limnology & Oceanography

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“…Maximum specific growth rates (0.05 d -1 ) were achieved in certain periods, but the actual growth rate varied conspicuously, probably due to strobilation of new individuals. The main prey item for S. tubulosa is believed to be copepods (Daan 1986), but the species can also feed on copepod nauplii (Møller & Riisgård 2007) and cirriped larvae (Hansson & Kiørboe 2006). Ephyrae are known to prey and grow on a variety of prey types, including cirriped larvae (Møller & Riisgård 2007).…”

Section: Population Dynamicsmentioning

confidence: 99%

“…For Sarsia tubulosa, the bell height (H, mm) was converted to carbon content (W C , µg C): W C = 0.443H 3.10 (Daan 1986). 1 mg dry wt (ephyra) = 3.66 J = 70 µg C; 1 mg dry wt (medusae) = 50 µg C (Schneider 1988).…”

Section: Methodsmentioning

confidence: 99%

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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“…The cause of the huge discrepancy in clearance rates between Bedford Basin and the present experimentally derived estimates remains unknown. Daan (1986) investigated food intake by Sarsia tubulosa and found a linear increase in prey consumption with medusa height. According to that study, a medusa of the height used in the present study would, at constant prey concentrations of 50 copepods l .…”

Section: Jellyfish Clearance Ratesmentioning

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.

124

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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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Food intake and growth of Sarsia tubulosa (SARS, 1835), with quantitative estimates of predation on copepod populations

Cited by 54 publications

References 9 publications

Prey resource use by coexistent hydromedusae from Friday Harbor, Washington

Prey resource use by coexistent hydromedusae from Friday Harbor, Washington

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

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

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