Functional response of the appendicularian <i>Oikopleura dioica</i>

Acuña, José Luis; Kiefer, Markus

doi:10.4319/lo.2000.45.3.0608

Cited by 51 publications

(61 citation statements)

References 30 publications

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“…This number is close to the mean of the range of 0 to 80% particulate adhesion reported in the literature (Acuña & Kiefer 2000). The size-specific and taxon-specific adhesion of particles to appendicularian houses is unknown.…”

Section: Methodssupporting

confidence: 59%

“…particle adhesion and digestion efficiency) being assumed equal. Acuña & Kiefer (2000) and Tiselius et al (2003) observed such an effect for O. dioica feeding in temperate and subarctic waters, respectively. Although prey concentrations in their experiments were over 3 times those in our study, the saturated weight-specific ingestion rates for O. dioica (0.16 and 0.20 µg C µg -1 C h -1…”

Section: Clearance Rates On Nanoplanktonmentioning

confidence: 99%

“…Perhaps not surprisingly, given the relative importance of picoplankton in tropical oceans, Oikopleura longicauda and O. fusiformis can clear naturally occurring prey in this size range at rates substantially higher than those of comparably sized appendicularians studied to date (King et al 1980, Alldredge 1981, Bedo et al 1993, Acuña & Kiefer 2000, Broms & Tiselius 2003, López-Urrutia et al 2003, Fernandez et al 2004, and vastly exceeding the rates of co-occurring copepods (Calbet et al 2000). In fact, grazing by O. longicauda can lead to mean picophytoplankton mortality rates comparable to those resulting from protozoan grazing (specifically 2 to 5 µm heterotrophic nanoflagellates) in Kaneohe Bay (Landry et al 1984, Scheinberg 2004.…”

Section: Relative Grazing Impact On the Natural Prey Assemblage Of Trmentioning

confidence: 99%

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Grazing of two common appendicularians on the natural prey assemblage of a tropical coastal ecosystem

Scheinberg

Landry²,

Calbet³

2005

Mar. Ecol. Prog. Ser.

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The clearance rates of co-occurring appendicularian species, Oikopleura longicauda and O. fusiformis, in Kaneohe Bay, Hawaii, were investigated to evaluate and compare their roles in a tropical food web. Individual appendicularians were captured in situ and allowed to feed on the natural plankton assemblage for 60 to 180 min. Feeding rate estimates were based on flow-cytometry analyses of cell-density changes for heterotrophic bacteria (Hbact), Synechococcus spp. (Syn) and <13.0 µm autotrophic eukaryotes (Aeuks). Despite morphological differences, O. longicauda and O. fusiformis cleared the largest prey size-fraction at statistically indistinguishable rates. For the 3 prey categories (Hbact, Syn and Aeuks), mean clearance rates (± 95% CI) were 12 ± 7, 27 ± 6 and 34 ± 18 ml individual (ind.)-1 h -1 and 25 ± 12, 26 ± 15 and 38 ± 20 ml ind. , O. fusiformis can remove an almost equivalent amount (> 50%). Nevertheless, the consistently higher abundances of O. longicauda make this species a more significant link between picoplankton production and higher-level consumers (chaetognaths and fishes) in this coastal tropical embayment.

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Section: Methodssupporting

confidence: 59%

Section: Clearance Rates On Nanoplanktonmentioning

confidence: 99%

Section: Relative Grazing Impact On the Natural Prey Assemblage Of Trmentioning

confidence: 99%

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Grazing of two common appendicularians on the natural prey assemblage of a tropical coastal ecosystem

Scheinberg

Landry²,

Calbet³

2005

Mar. Ecol. Prog. Ser.

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“…The ingestion rate of a filter-feeder equals its clearance rate multiplied by the concentration of food (Huntley & Boyd 1984). In appendicularians, a proportion of the particles cleared remains attached to the filter house and is not ingested (up to 80%: Acuña & Kiefer 2000). Therefore, their ingestion rates cannot be estimated by the product of clearance rates by food concentration, and the approach of Huntley & Boyd (1984) needs to be modified.…”

Section: Methodsmentioning

confidence: 99%

Food limitation and growth in temperate epipelagic appendicularians (Tunicata)

López‐Urrutia¹,

Acuña²,

Irigoien³

et al. 2003

Mar. Ecol. Prog. Ser.

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Through an extensive review of reports on appendicularian ecology, we have developed a set of equations on the feeding, metabolic and growth rates of temperate epipelagic appendicularian species. We have used these equations to study the conditions in which these species are likely to experience food-limited growth. As Oikopleura dioica is the most-studied appendicularian species, we have used equations developed for this one species to construct a metabolic budgetary model. Our results suggest that large O. dioica are less likely to experience food-limited growth than other mesozooplankton, and that growth during early development could be more limited by food concentration in the environment. The degree of food limitation strongly depends on the assimilation efficiency of non-autotrophic material, which comprises a great proportion of the appendicularian diet. However, examination of direct measurements of growth rate over a wide range of food concentrations showed no significant relationship between food concentration and weight-specific growth rates. Temperature alone explained more than 60% of the variance in appendicularian weight-specific growth rates. Since there were no clear differences in the growth rates of different appendicularian species, we have combined the available data to develop a temperature-dependent equation to predict their weight-specific growth rates. We have also modified the growth rate equation to take into consideration the expenditure in house secretion. Combination of this growth rate equation with biomass estimations allows us to evaluate their contribution to secondary production. In contrast with the traditional view of appendicularians as important members of oligotrophic ecosystems, our results show that in the study area their contribution to secondary production was higher during more productive conditions. KEY WORDS: Appendicularian · Growth · Ingestion · Respiration · Oikopleura · Fritillaria Resale or republication not permitted without written consent of the publisher

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“…They are motile and can be compressed or curved (Fig. 4b), but they are never twisted (Acuna and Kiefer, 2000). The cells are spherical or elliptic with a length of 35 µm and a width of 14 µm.…”

Section: Microalgaementioning

confidence: 99%

Effects of Light Exposure and Nitrogen Source on the Production of Oil from Freshwater and Marine Water Microalgae

hattab¹,

Ghaly²

2014

American Journal of Biochemistry and Biotechnology

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Abstract:The biomass yield and oil content of Chlorella saccharophila (freshwater) and Tetraselmis suecica (marine) microalgae were investigated using various nitrogen source (ammonium nitrate, ammonium phosphate, ammonium sulfate and combination of nutrients) at various light durations (9, 16 and 24 h). NaHCO 3 was used as the carbon source. The nitrogen concentration, temperature and pH were maintained at 70 mg/L, 22°C and 8.5, respectively. The results indicated that T. suecica produced higher cell yield compared to the C. saccharophila under all levels of parameters tested. Light exposure of 24 h produced the highest biomass yield. However, the difference in cell yields between light duration of 16 and 24 h was not significant. The combination of nutrients resulted in the highest growth for both species of microalgae. However, high growth did not necessarily result in high oil yield. The oil content was much higher for C. saccharophila than T. suecica. Varying light duration had no direct effect on oil yield. The nutrient type significantly influenced the production of oil. C. saccharophila produced the highest oil yield using ammonium phosphate while T. suecica achieved the highest oil yield using ammonium nitrate. The results indicated that high algal growth does not necessarily result in high oil yield. Both, the generation of new cells and storage of oil require energy. When the cells used energy for generation of new cells they store less oil. Thus, growing C. saccharophila using the combination of nutrients at 16 h light exposure would be the optimal growth conditions for producing oil for biodiesel production.

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Functional response of the appendicularian Oikopleura dioica

Cited by 51 publications

References 30 publications

Grazing of two common appendicularians on the natural prey assemblage of a tropical coastal ecosystem

Grazing of two common appendicularians on the natural prey assemblage of a tropical coastal ecosystem

Food limitation and growth in temperate epipelagic appendicularians (Tunicata)

Effects of Light Exposure and Nitrogen Source on the Production of Oil from Freshwater and Marine Water Microalgae

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