Ingestion rate and gut clearance in the planktonic copepod<i>Centropages hamatus</i>(Lilljeborg) in relation to food concentration and temperature

Kiørboe, Thomas; Møhlenberg, Flemming; Nicolajsen, Hanne Westh

doi:10.1080/00785326.1982.10426586

Cited by 170 publications

(62 citation statements)

References 22 publications

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“…The FPT estimated for C. sinicus was < 0.44 h, consistent with the estimation by Dam & Peterson (1988) for Temora longicornis based on the relationship between FPT and temperature. The FPT in marine copepods is, however, species-specific, ranging from 0.3 h to > 2 h, as measured by gut fluorescence or radiotracer techniques (Kiørboe et al 1982). In the present study, the difference in FPT accounted at least partially for the variation in metal AE; thus, longer retention of food particles in the copepod's gut resulted in more efficient metal assimilation.…”

Section: Trace-metal Assimilation From Ingested Food Particlesmentioning

confidence: 67%

Individual responses of trace-element assimilation and physiological turnover by the marine copepod Calanus sinicus to changes in food quantity

Xu¹,

Wang²

2001

Mar. Ecol. Prog. Ser.

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Section: Trace-metal Assimilation From Ingested Food Particlesmentioning

confidence: 67%

Individual responses of trace-element assimilation and physiological turnover by the marine copepod Calanus sinicus to changes in food quantity

Xu¹,

Wang²

2001

Mar. Ecol. Prog. Ser.

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“…Cell concentrations at the start and end of the experiments were determined with the Elzone particle counter. The ingestion and clearance rates of food in each replicate were calculated according to the equations of Kiørboe et al (1982). Whole pellets and pellet fragments were counted under a dissecting microscope and daily pellet production rates determined.…”

Section: Methodsmentioning

confidence: 99%

Coupling of ingestion and defecation as a function of diet in the calanoid copepod Acartia tonsa

Beşiktepe¹,

Dam

2002

Mar. Ecol. Prog. Ser.

157

129

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ABSTRACT:The relationship between the rates of ingestion and defecation of the calanoid copepod Acartia tonsa was examined in laboratory experiments with different diets: the diatom Thalassiosira weissflogii, the autotrophic dinoflagellate Prorocentrum minimum, the heterotrophic dinoflagellate Oxyrrhis sp., the flagellate Dunaliella tertiolecta, and the bacterivorous scuticociliate Uronema sp. Experiments were run typically using between 6 and 8 concentrations ranging from 10 to 1150 µg C l -1. Both diet and food concentration had significant effects on ingestion rate, pellet production rates and pellet volume. Ingestion and pellet production rates increased curvilinearly with food concentration. Copepods achieved the highest pellet production rates, the largest pellets and the shortest estimated gut passage times with the diatom diet. For all diets, gut passage time decreased with food concentration in the range 0 to ca. 250 µg C l -1 , but little thereafter. In addition, for all diets, but most obviously in the case of the diatom, pellet volume increased curvilinearly with food concentration. Maximum pellet volume was achieved at food concentrations ranging from 50 to 150 µg C l -1. The defecation and ingestion rates were best correlated when the copepods fed on the diatom and the autotrophic dinoflagellate. Likewise, a decrease in estimated assimilation efficiency with increasing food concentration was apparent only for these 2 diets. This latter pattern is primarily due to an increase in pellet production rate, instead of pellet volume, relative to ingestion rate at the high food concentrations. We conclude that a diatom diet is the most likely one to result in attributes that enhance zooplankton-mediated export flux: high fecal pellet production rates, large pellet size and relatively low assimilation efficiency.

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“…Only under low TS conditions are bacteria correlated to biogenes, therefore a high TS concentration seemed to autonomize the bacteria to biogenes. Virtually all aspects of physiology, including grazing (Kiørboe et al, 1982;Houde and Roman, 1987), respiration (Ikeda, 1985;Thor et al, 2002), timing of reproduction and onthogenetic development (Dell et al, 2011), are impacted by temperature. As temperature directly interacts in reducing or enhancing the metabolism and reproduce rates (Green, 1966;Frey, 1982;Gillooly and Dodson, 2000;de Eyto and Irvine, 2001), it has multiple indirect effects on aquatic communities' habitats by altering food resources.…”

Section: Contribution Of Environmental Factors To Food Web Relationsmentioning

confidence: 99%

Indirect effect of environmental factors on interactions between microbial and classical food webs in freshwater ecosystems

Adamczuk

Mieczan

Nawrot

et al. 2015

Ann. Limnol. - Int. J. Lim.

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-The role of environmental factors in aquatic ecosystems results from basic lake characteristics, human disturbances ('cultural eutrophication') and climate-related trends in the physical and chemical components of lakes. Although the influence of environmental factors on the abundance of aquatic animals is fairly well documented, less has been done to research their influence on food web interactions. The aim of the study was to evaluate microbial and classical food webs in lakes, with special emphasis placed on the role of environmental factors as influencing strengths. Variation partitioning, based on redundancy analysis, revealed that environmental factors played the most important role in structuring aquatic communities by accounting for 87.5% of their variation. Among all the factors measured, total solids (TS), transparency (Secchi disc) and temperature were most closely related to the variation in trophic communities. The analyses of food web interactions under low and high levels of those factors revealed that they differently influenced strengths among food web components. The strongest relations among distinct trophic levels were found under conditions of low TS, the lowest number of relations was found under conditions of low temperature. Only in low TS did bacteria correlate significantly with biogenes. Under high TS, bacteria positively influenced plenty of higher trophic levels. Top-down control was observed under conditions of high temperature. Conditions of low and high transparency did not diversify food web interactions. The obtained results can broaden our knowledge of the response of food webs to environmental factors in advanced stages of global eutrophication of water bodies and in the early stage of projected trends of global climate change.

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Ingestion rate and gut clearance in the planktonic copepodCentropages hamatus(Lilljeborg) in relation to food concentration and temperature

Cited by 170 publications

References 22 publications

Individual responses of trace-element assimilation and physiological turnover by the marine copepod Calanus sinicus to changes in food quantity

Individual responses of trace-element assimilation and physiological turnover by the marine copepod Calanus sinicus to changes in food quantity

Coupling of ingestion and defecation as a function of diet in the calanoid copepod Acartia tonsa

Indirect effect of environmental factors on interactions between microbial and classical food webs in freshwater ecosystems

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