Selection of particle sizes by filter‐feeding copepods: A plea for reason

Boyd, Carl M.

doi:10.4319/lo.1976.21.1.0175

Cited by 151 publications

(70 citation statements)

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“…Several workers who assumed that copepods were filtering cells have suggested that the spacing of the setules determined the efficiency with which various cell sizes were captured (Nival and Nival 1976;Boyd 1976). However, since adhesion to the setules is not a criterion for successful capture in either the passive or active feeding mode, setule spacing may be relatively unimportant in determining retention efficiency.…”

Section: Capture Of Small Cells By the Copepod Eucalanus Elongatuslmentioning

confidence: 99%

Capture of small cells by the copepod Eucalanus elongatus1

Price

Paffenhöfer

1986

Limnology & Oceanography

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Calanoid copepods feed by detecting and actively responding to relatively large individual cells and by accumulating smaller cells in a relatively passive manner by low amplitude flapping of the second maxillae. Films of Eucalanus elongatus passively collecting 13‐µm Thalassiosira weissflogii cells show that cells flow between the setae from the outer to the inner surface of the second maxillae. They are then funneled medially toward the setal tips and mouth, usually without adhering to the setae. The observed patterns of water flow contradict both the early descriptions of filter feeding and the expectation of negligible flow through setae in a low Reynolds number environment.

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Section: Capture Of Small Cells By the Copepod Eucalanus Elongatuslmentioning

confidence: 99%

Capture of small cells by the copepod Eucalanus elongatus1

Price

Paffenhöfer

1986

Limnology & Oceanography

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“…For a generalized filter feeder, the rate of capture of particles of size X, C(X), may be represented as the product of three functions (Boyd 1976): S(X), the abundance of the panicles as a function of their size, V, the volume filtered in a unit time, and E(X), the relative capture efficiency of the filter feeder for particles of size X.…”

Section: The Modelmentioning

confidence: 99%

A Model of Seston Capture by Net-Spinning Caddisflies

Georgian¹,

Wallace²

1981

Oikos

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Six species of net-spinning caddisflies (Trichoptera) coexist in the headwater region of the Tallulah River, a rocky, high-gradient tributary of the Savannah River. These caddisflies feed on the suspended organic matter (seston) captured by their nets. We analyzed these species' nets, microhabitat preferences, and monthly abundances. These data, along with the particle size distributions and monthly abundances of seston, were incorporated into a model of seston capture by these net-spinning caddisflies.The resulting model permitted us to test the hypothesis that differences in capture net mesh sizes serve to partition, by size, the food available to coexisting net-spinning caddisflies. and thus reduce competition between them. The model predicted annual seston capture by the six species of 1300 g AFDW (ash free dry weight), over 1000 times their annual production. The seston captured per longitudinal meter of stream represents 0.005% of the total seston in transport. Resource overlap coefficients indicated that the instars of the five hydropsychid species do not partition the seston by particle size or food type in a manner that reflects competitive interactions. We hypothesize that these filter feeders are limited by the availability of high-quality food items (primarily drifting animals) rather than by the overall seston supply. Species with highly selective feeding habits must filter large volumes of water to permit them to specialize on rare items. High filtration rates require rapid current velocities, large nets, and coarse net meshes. Instars with coarse-meshed nets showed the largest proportionate declines in seston capture rates when the model was simulated using the lower current velocity and smaller seston panicles sizes typical for the larger Savannah River.

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“…Fish gill rakers are thought to function as mechanical filters (Durbin and Durbin 197 5;Rosen and Hales 198 1). We developed a model of filtering efficiency as a cumulative frequency of interraker distances (Boyd 1976;Nival and Nival 1976) and used the model to predict gizzard shad feeding rates on different sizes of microspheres and zooplankton. We determined the impact of gizzard shad grazing on phytoplankton community structure from changes in the plankton of experimental ponds after introduction of the fish.…”

mentioning

confidence: 99%

Selective particle ingestion by a filter‐feeding fish and its impact on phytoplankton community structure1

Drenner¹,

Mummert²,

deNoyelles³

et al. 1984

Limnology & Oceanography

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The ingestion rates of filter-feeding gizzard shad for different sizes of suspended particles were measured using mixtures of microspheres and zooplankton. Ingestion rate increases as a function of particle size, leveling off at 60 pm. The particle-size-dependent ingestion rates were consistent with a model of filtering efficiency based on the cumulative frequency of interraker distances of gizzard shad gill rakers.Comparison of ponds containing gizzard shad with control ponds without fish showed that gizzard shad suppressed Ceratium, the only phytoplankton species large enough to be ingested at a maximum rate. Gizzard shad did not have a significant effect on populations of Synedra, Peridinium, Navicula, Kirchneriella, Cyclotella, and Chlamydomonas. Populations of Ankistrodesmus, Cryptomonas, Cosmarium, Rhodomonas, and algae and bacteria from 2-4 pm were enhanced by gizzard shad.

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Selection of particle sizes by filter‐feeding copepods: A plea for reason

Cited by 151 publications

References 0 publications

Capture of small cells by the copepod Eucalanus elongatus1

Capture of small cells by the copepod Eucalanus elongatus1

A Model of Seston Capture by Net-Spinning Caddisflies

Selective particle ingestion by a filter‐feeding fish and its impact on phytoplankton community structure1

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