Zooplankton and Potential Fish Production in Lake Ontario

Borgmann, Uwe; Shear, Harvey; Moore, Jon

doi:10.1139/f84-159

Cited by 51 publications

(27 citation statements)

References 10 publications

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“…For a sample size of 4, the range (10.4-19.5) would include the true mean production with greater than 80% confidence, assuming production by station follows a normal distribution. The mean summer epilimnetic zooplankton biomass at the same sites from 1981 to 1985 was 1.54 g/m2 (Johannsson 1987), giving a mean biom s s turnover rate of 9.l/yr, lower than that initially estimated for Lake Ontario zooplankton using data collected only up to 1981 (Borgmann et al 1984). Biomass production estimates for hypolimnetic zooplankton, or those found in the thermocline, are not available, but turnover rates would be expected to be lower than for the epilimnetic zooplankton.…”

Section: Invertebrate Production In Lake Ontariomentioning

confidence: 78%

Particle-size-conversion Efficiency, Invertebrate Production, and Potential Fish Production in Lake Ontario

Borgmann¹,

Whittle²

1994

Can. J. Fish. Aquat. Sci.

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Borgmann, U., and D.M. Whittle. 4994. Particle-size-conversion efficiency, invertebrate production, and potential fish production in Lake Ontario. Can. J. Fish. Aquat. Sci. 51: 693-780.The relationships between body sime and p,pf-DDE and total PCB concentration in zooplankton, rnysids, amp h ipods, slimy scu [pin (Cottus cognatus), rainbow smelt (Osmerus mordax), alewife (Alosa pseudoharengus), and lake trout (Sa%vebinus namaycush) in bake Ontario were determined for samples collected from 5989 ts 1992. Amphipods, and to a lesser extent sculpins, had higher DDE and PCB concentrations than predicted from the contaminant concentration -body size relationship for the pelagic species. PCB, but not DDE, concentrations in zooplankton were also abnormally high. For the pelagic species, excluding PCB concentrations in zooplankton, the log contaminant concentration -log body sime relationship had a slope of 0.23 (95% confidence limits = k8.014). Combined with revised estimates of the efficiency of contaminant retention from one body size to anbtker (EL 0.85-8.10), the revised estimate of particle-size-conversion efficiency (E) for Lake Ontario falls between 0.27 and 0.35. Recent estimates of inve~ebrate (zooplankton, mysid, and amphipod) annual production average 18 dm' (dry weight) with upper and lower limit estimates of 14-27 d m 2 . Using E to extrapolate from invertebrate to fish production results in estimates of mean potential fish production in Lake Ontario of 1-7 kdha (wet weight), as csmpared with previously published estimates of 6 and 14 kglha. Nous avsns calcule, pour des kchantilions prelevks de 1989 21 1992, Bes relations entre la taille csrporelle et la concentration de p,pf-DDE et des BPC totaux dans le nooplanctsn, les rnysidac6s, les amp hi psdes, les c haboisseaux (Cottus cognatus), If6perlon (Osmerus mordax), le gaspareau (A%osa pseudoharewgus), et le touladi (Salvelinus namaycush) du lac Ontario. Les amphipodes, et les chaboisseaux dans une moindre mesure, prksentaient des concentrations de DDE et de BPC plus eleves que pr6vu dPaprPs la relation concentration de contaminants -tailie corporelie pour les espPces pdagiques. Les concentra-tions de BPC, mais non de DDE, dans B e zooplancton 6taient aussi anormalemewt klevbes. Pour les esp$ces pelagiques, si I'on exclut les concentrations de BPC dans le zooplancton, la relation log de la concentration de contaminants -Isg de la taille corporelle prksentait une pente de 0,23 (seuil de confiance de 95 % = +_8,014). Si on la combine 21 des estimations rbvisees de I'efficience de la retention des contaminants d'une taille corporetle . 3 I'autre (E' = 0,05-8,10), Ifestimation reviske de I'efficience (E) de la conversion particule-taille pour E e lac Ontario tombe entre 0,27 et 8/35. Les estimations recentes de la production annuelie les invert6brks (zooplancton, mysidacks et am-lphipodes), est en moyenne de 18 d m 2 (poids sec), avec des limites superieure et infkrieure estimees 3 54 et 27 gj/m2. Le recsurs 2 e pour extrapoler de la production dfinvert6br6s 2 l...

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Section: Invertebrate Production In Lake Ontariomentioning

confidence: 78%

Particle-size-conversion Efficiency, Invertebrate Production, and Potential Fish Production in Lake Ontario

Borgmann¹,

Whittle²

1994

Can. J. Fish. Aquat. Sci.

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“…The trophic importance of protozoa is illustrated further by the substantial fraction of potential macrozooplankton annual pro-duction that can be supported by ingestion of protozoan C. If we assume production estimates (Borgmann et al 1984) for Lake Ontario macrozooplankton (-2.0 pg C liter-l d-l) are in the range for production expected in Lake Michigan (macrozooplankton production has not been estimated for Lake Michigan) based on the similarities between lakes in terms of zooplankton composition and abundance, grazing on protozoa by macrozooplank.ton can support >80% of annual macrozooplankton production (assuming 15% zooplankton assimilation efficiency). These estimates indicate that protozoa are likely to be quantitatively significant prey for epilimnetic macrozooplankton in Lake Michigan.…”

Section: Discussionmentioning

confidence: 99%

The importance of zooplankton‐protozoan trophic couplings in Lake Michigan

Carrick

Fahnenstiel

Stoermer

et al. 1991

Limnology & Oceanography

136

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The importance of the zooplankton-protozoan trophic coupling was determined experimentally by measured changes in protozoan growth rates with increasing zooplankton biomass. In five of six experiments conducted in Lake Michigan, a significant inverse relationship between protozoan growth and zooplankton biomass was observed (avg r2 = 70%), Zooplankton clearance rates on protozoan assemblages (range, 1.0-6.2 ml (pg dry wt)-I d '1 were comparable to those previously measured for phytoplankton which suggested that protozoa are important prey for zooplankton. Clearance rates on individual protozoan taxa [O-15.6 ml (Fg dry wt)-I d-l] were size-dependent. Rates were greatest for taxa ~20 grn in size (mainly nanoflagellates and small ciliates). In contrast to findings for phytoplankton, no evidence emerged for grazer resistance nor growth enhancement by planktonic protozoa in response to grazing. The high flux rates for macrozooplankton on heterotrophic nanoflagellates observed in all experiments (0.2-6.0 pg C liter-' d-l) provided evidence that a large fraction of picoplankton C may be directly transferred to higher trophic levels via a picoplankton-flagellate-zooplankton coupling.

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“…Their estimated consumption values were also greater than their estimated zooplankton production rates. Other independent estimates of zooplankton production in the lake (Borgmann et al 1984;Kuns and Sprules 2000) would suggest that our consumption values might be in balance with prey production rates.…”

Section: Comparison Between Planktivory and Zooplankton Biomassmentioning

confidence: 95%

Mysid and fish zooplanktivory in Lake Ontario: quantification of direct and indirect effects

Gal¹,

Rudstam²,

Mills³

et al. 2006

Can. J. Fish. Aquat. Sci.

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Mysis relicta and planktivorous fish feed on zooplankton in Lake Ontario and form a trophic triangle that includes intraguild predation by fish on mysids. Thus, fish affect zooplankton both directly and indirectly. To evaluate the importance of alewife (Alosa pseudoharengus), rainbow smelt (Osmerus mordax), and mysids as zooplanktivores in Lake Ontario, we measured abundances and distributions, assessed diets, and computed mysid and fish consumption rates based on bioenergetics models. We further estimated indirect effects by comparing clearance rates given observed and potential mysid distributions. Estimated consumption rates varied widely with season and water depth and ranged between 2.6 × 10 -3 and 1.3 g·m -2 ·day -1 for mysids and between 1.4 × 10 -3 and 0.5 g·m -2 ·day -1 for fish, representing a daily removal of zooplankton of up to 10.2%·day -1 and 2.0%·day -1 by mysids and fish, respectively. Mysid planktivory exceeded fish planktivory in May and August, but fish planktivory dominated in October. Estimated mysid planktivory rates were 2-to 90-fold lower than the potential rate if mysids moved to temperatures that maximized their predation rates, suggesting an indirect positive effect of fish on zooplankton.Résumé : Dans le lac Ontario, Mysis relica et les poissons planctonophages se nourrissent de zooplancton et forment ainsi un triangle trophique qui inclut la prédation par des membres de la guilde des poissons sur les mysidacés. Les poissons affectent donc le zooplancton à la fois directement et indirectement. Afin d'évaluer l'importance de la consommation de zooplancton par le gaspareau (Alosa pseudoharengus), l'éperlan arc-en-ciel (Osmerus mordax) et les mysidacés, nous avons mesuré les abondances et les répartitions, déterminé les régimes alimentaires et calculé les taux de consommation des mysidacés et des poissons d'après des modèles bioénergétiques. Nous avons estimé, de plus, les effets indirects en comparant les taux de clearance, compte tenu des répartitions observées et potentielles des mysidacés. Les taux de consommation estimés varient considérablement en fonction de la saison et de la profondeur de l'eau: ils vont de 2,6 × 10 -3 à 1,3 g·m -2 ·jour -1 chez les mysidacés et de 1,4 × 10 -3 à 0,5 g·m -2 ·jour -1 chez les poissons, ce qui correspond à des retraits quotidiens du zooplancton respectifs de jusqu'à 10,2 % par jour et de 2,0 % par jour. La consommation de plancton par les mysidacés dépasse celle des poissons en mai et en août, mais celle effectuée par les poissons domine en octobre. Les taux estimés de consommation du plancton par les mysidacés sont 2-90 fois plus faibles que les taux potentiels que l'on obtiendrait si les mysidacés se déplaçaient vers les températures qui maximisent leur taux de prédation; il semble donc y avoir un effet indirect positif des poissons sur le zooplancton.[Traduit par la Rédaction] Gal et al. 2747

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Zooplankton and Potential Fish Production in Lake Ontario

Cited by 51 publications

References 10 publications

Particle-size-conversion Efficiency, Invertebrate Production, and Potential Fish Production in Lake Ontario

Particle-size-conversion Efficiency, Invertebrate Production, and Potential Fish Production in Lake Ontario

The importance of zooplankton‐protozoan trophic couplings in Lake Michigan

Mysid and fish zooplanktivory in Lake Ontario: quantification of direct and indirect effects

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