scholarly journals Particle size selection, feeding rates and growth dynamics of marine planktonic oligotrichous ciliates (Ciliophora: Oligotrichina)

1986 ◽  
Vol 33 ◽  
pp. 265-277 ◽  
Author(s):  
PR Jonsson
Keyword(s):  
Particle Size ◽  
Growth Dynamics ◽  
Feeding Rates ◽  
Size Selection

Seasonal Particle-Size Selection by Diaptomus sicilis in Offshore Lake Michigan

1981 ◽  
Vol 38 (5) ◽  
pp. 504-517 ◽  
Author(s):  
H. A. Vanderploeg
Keyword(s):  
Particle Size ◽  
Lake Michigan ◽  
Food Selectivity ◽  
The Other ◽  
Size Spectrum ◽  
Feeding Rates ◽  
Size Selection ◽  
Feeding Experiments ◽  
Spherical Diameter ◽  
Filtering Efficiency

Diaptomus sicilis feeding on offshore Lake Michigan seston exhibited a relatively invariant pattern of particle-size selection in 23 separate feeding experiments conducted from spring through fall over a 2-yr period. This pattern persisted for different feeding rates under varying conditions of particle-size spectrum shape, abundance and food quality of particles, and temperature. Selection was quantified by calculating W′ (filtering efficiency) as a function of particle size (equivalent spherical diameter). In all but one of the few experiments yielding a W′ curve that varied appreciably from the other W′ curves, serious bias from grazer-produced particles was evident and/or elongated particles dominated the seston. The elongated particles could have led to deviations because of differences in filtering efficiency between round and elongated particles of small volume and because elongated particles of large volume have to be captured raptorially. It is argued that the more variable patterns of particle-size selection observed in many of the other studies of zooplankton feeding on natural seston result from: (1) improper methods of quantifying selection, (2) serious bias from grazer-produced particles, and (3) varying particle shape, which is not usually specified. The mechanisms of particle selection by Diaptomus and other species that filter like Diaptomus are reviewed, and it is noted that invariant selection is not inconsistent with both filtering and raptorial modes of feeding operating simultaneously. All the evidence points to a strong passive-mechanical filtering mode of feeding that may be supplemented by a raptorial mode of feeding that selects large particles of high food quality.Key words: Diaptomus sicilis, particle-size selection, filter feeding, peak tracking, passive selection, Lake Michigan, food selectivity

Particle size selection in post-spark dusty plasma in non-uniform electric field

2016 ◽  
Vol 109 (19) ◽  
pp. 193107
Author(s):  
Woongsik Kim ◽  
Peter V. Pikhitsa ◽  
Mansoo Choi
Keyword(s):  
Particle Size ◽  
Electric Field ◽  
Dusty Plasma ◽  
Uniform Electric Field ◽  
Size Selection

Influence of particle size selection methods on asphalt mixtures produced with lateritic aggregates

2022 ◽  
Vol 314 ◽  
pp. 125201
Author(s):  
Gabryelle Keith Avelino Cruz ◽  
Osires de Medeiros Melo Neto ◽  
Sonaly Mendes Arruda ◽  
Leda Christiane de Figueiredo Lopes Lucena ◽  
Christian Rafael Ziegler ◽  
...  
Keyword(s):  
Particle Size ◽  
Asphalt Mixtures ◽  
Selection Methods ◽  
Size Selection

Filtering structures and particle size selection in coexisting Cladocera

Oecologia ◽  
1985 ◽  
Vol 66 (3) ◽  
pp. 368-372 ◽  
Author(s):  
Dag Olav Hessen
Keyword(s):  
Particle Size ◽  
Size Selection

Grinding and particle size selection as a procedure to enhance the magnetocaloric response of La(Fe,Si)13 bulk samples

2017 ◽  
Vol 84 ◽  
pp. 30-34 ◽  
Author(s):  
J.J. Ipus ◽  
J.M. Borrego ◽  
L.M. Moreno-Ramírez ◽  
J.S. Blázquez ◽  
V. Franco ◽  
...  
Keyword(s):  
Particle Size ◽  
Size Selection

Experimental Analysis of the Direct and indirect Effects of an Omnivorous Filter-Feeding Clupeid on Plankton Community Structure

1986 ◽  
Vol 43 (10) ◽  
pp. 1935-1945 ◽  
Author(s):  
Ray W. Drenner ◽  
Stephen T. Threlkeld ◽  
Michael D. McCracken
Keyword(s):  
Particle Size ◽  
Indirect Effects ◽  
Zooplankton Biomass ◽  
Plankton Community ◽  
Direct And Indirect Effects ◽  
Dorosoma Cepedianum ◽  
Feeding Rates ◽  
Filter Feeding ◽  
Menidia Beryllina ◽  
Plankton Community Structure

In laboratory trials, feeding rates of an omnivorous filter-feeding clupeid, Dorosoma cepedianum, increased as a function of particle size, with maximal rates on microspheres, spherical algae, and Zooplankton >40 μm; it did not efficiently feed on filamentous Anabaena flos-aquae. To examine the community level impacts of Dorosoma, we conducted four seasonal outdoor tank experiments of cross-classified design involving two or three densities of Dorosoma and two densities of the zooplanktivorous atherinid fish, Menidia beryllina. We attempted to discriminate between the direct and indirect effects of Dorosoma on phytoplankton by using Menidia to produce indirect effects on phytoplankton by suppressing Zooplankton. Experiments began in November, March, June, and September and lasted for 45–53 d. Dorosoma suppressed most Zooplankton in at least one experiment and enhanced algal standing crops in all four experiments, as indicated by increased algal chlorophyll fluorescence, turbidity, Coulter counts and microscopic algal counts, and decreased Secchi depths. Because in three out of four experiments Menidia suppressed Zooplankton biomass to a greater extent than Dorosoma without enhancing phytoplankton, we reject the hypothesis that the enhancement of phytoplankton by Dorosoma was an indirect effect of Zooplankton biomass suppression.

scholarly journals Particle size selection device for use with the Turbohaler.

Thorax ◽  
1996 ◽  
Vol 51 (5) ◽  
pp. 537-539 ◽  
Author(s):  
M. L. Everard ◽  
S. G. Devadason ◽  
P. N. Le Souef
Keyword(s):  
Particle Size ◽  
Size Selection
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