Predation by Acartia tonsa Dana on planktonic ciliates and rotifers

Stoecker, Diane K.; Egloff, David A.

doi:10.1016/0022-0981(87)90066-9

Cited by 250 publications

(153 citation statements)

References 42 publications

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“…According to our and others' results, some copepods are highly selective for ciliates (e.g. Stoecker & Sanders 1985, Stoecker & Egloff 1987, Nejstgaard et al 1997 which are hypothesized to be nutritionally superior food (Stoecker & Capuzzo 1990, Sanders & Wickham 1993. …”

Section: Methodsmentioning

confidence: 59%

Prey switching by Acartia clausi:experimental evidence and implications of intraguild predation assessed by a model

Gismervik¹,

Andersen²

1997

Mar. Ecol. Prog. Ser.

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Sw~tching between algal (Thalasdosira we~ssflog~i) and ciliate (Strobilidium undinum) food by the marine copepod Acartia clausi was investigated In the laboratory by short incubation experiments with l4C-labeled prey. A. clausi displayed a Holling type 3 functional response (which differed significantly from a type 2 response, p c 0.05) for ciliates when there was a constant abundance of algae present, and likewise for algae when there was a constant abundance of ciliates present. The results were implemented in a mathematical model to investigate the effect of different functional responses on a simple food web comprised of nutrient, algae, ciliates and copepods. In the model, ciliates and copepods competed for resources (algae) and ciliates were also prey for copepods. This blend of predation and competition among copepods and ciliates corresponds to intraguild predation as defined by Polis & Holt (1992; Trends Ecol Evol 7:151-154). Stable solutions with all state variables present were found over a range of nutrient concentrations when the copepods displayed type 3 functional responses. On the contrary, when copepods displayed type 2 responses, such stable solutions were only found at very low input nutrient concentrations. Coexistence of ciliates and copepods further required that clliates had a lower threshold prey concentration for positive net growth than copepods.

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Section: Methodsmentioning

confidence: 59%

Prey switching by Acartia clausi:experimental evidence and implications of intraguild predation assessed by a model

Gismervik¹,

Andersen²

1997

Mar. Ecol. Prog. Ser.

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“…Evidence exists to suggest that ciliates, rotifers (e.g. Stoecker and Egloff 1987;Gifford and Dagg 1988), and heterotrophic nanoflagellates (Roman et al 1988) may at times be an important and preferred component of copepod diet.…”

Section: Notesmentioning

confidence: 99%

“…Adopting an absorption efficiency of 80% (Stoecker 1984) and a oneand two-step grazing food chain for nanoplankton and picoplankton production, respectively, allows one to calculate an overall net growth yield of 1% for the microzooplankton community after accounting for measured rates of excretion. Dissolved N excretion within the microbial food web recycles about 74% of the ingested N ration.…”

Section: Notesmentioning

confidence: 99%

“…The small sinking loss associated with protozoan feces (Stoecker 1984;Small et al 1987) probably means that they are recycled in situ. Thus our calculated microzooplankton production would constitute an underestimate if decomposition of protozoan feces contributed to measured excretion rates or if there was appreciable reingestion of these fecal pellets by microzooplankton.…”

Section: Notesmentioning

confidence: 99%

“…Although based on some simplistic premises, we feel that the model can provide conservative estimates of this potential link to mesozooplankton. Likely contributing factors are the slow sinking rates typical of nonaggregated nanoplankton and picoplankton (Bienfang 1985) and the feces produced by their microzooplankton grazers (Stoecker 1984;Small et al 1987) which act to spatially and temporally smear the signal associated with an originally localized input of new nutrient through upwelling. Thus, in newly upwelled waters, the consumption of new nutrients by smaller phototrophs and its control by concentrations of recycled N (Fig.…”

Section: Notesmentioning

confidence: 99%

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Size-fractionated measurements of nitrogen uptake in aged upwelled waters: Implications for pelagic food webs

Probyn

1990

Limnol. Oceanogr.

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Uptake of NO3−, NH4+, and urea was measured for the 200–20‐, 20–2‐, and <2‐µm size classes within the chlorophyll maximum layer in the Benguela upwelling system. Picoplankton and nanoplankton dominated in terms of biomass and activity both inshore and offshore. Net plankton N uptake declined drastically at night, whereas the smaller size classes maintained rates close to daytime levels. There was some evidence for N resource partitioning. Reduced N generally made up a higher proportion of the total N uptake by nanoplankton and picoplankton (for both size classes, mean = 94%) than by net plankton (mean = 63%). The contribution of nanoplankton and picoplankton NH4+ uptake always exceeded 50% of the total primary N production. In a regeneration‐based model with small cells dominating primary production it is conservatively estimated that carnivory on microzooplankton can contribute 14% toward the production of an omnivorous mesozooplankton assemblage.

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Production and Nutritional Value of Copepods

Støttrup¹

2003

Live Feeds in Marine Aquaculture

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Predation by Acartia tonsa Dana on planktonic ciliates and rotifers

Cited by 250 publications

References 42 publications

Prey switching by Acartia clausi:experimental evidence and implications of intraguild predation assessed by a model

Prey switching by Acartia clausi:experimental evidence and implications of intraguild predation assessed by a model

Size-fractionated measurements of nitrogen uptake in aged upwelled waters: Implications for pelagic food webs

Production and Nutritional Value of Copepods

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