Some patterns of predation and prey selection by the rotifer <i>Asplanchna girodi</i> in replicated outdoor tanks

Commins, Marcie L.; Salt, George W.

doi:10.1080/03680770.1987.11899839

Cited by 5 publications

(7 citation statements)

References 3 publications

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“…Several studies have shown an increase in the number of prey in predator's guts with increasing abundance of plankton in the medium (Commins & Salt, 1988;Conde-Porcuna, Morales-Baquero & Cruz Pizarro, 1993b;Sarma, 1993). We did not observe this relationship, however, although we showed that the volume of prey items per Asplanchna individual increased with increasing prey density.…”

Section: Discussioncontrasting

confidence: 81%

“…Data for field-collected A. girodi should ideally be supplemented with data from ambient plankton samples (Commins & Salt, 1988). Field-collected A. girodi might show some variations in gut contents, depending on the time that lapsed between collection and preservation (Sarma, 1993).…”

Section: Introductionmentioning

confidence: 99%

“…In nature Asptanchna girodi (De Guerne) is exposed to a variety of prey organisms including species of phytoplankton and zooplankton. Numerous field studies have indicated that A. girodi can selectively feed on large phytoplankton, ciliates, rotifers, cladocerans and copepod nauplii (Guiset, 1977;Salt, 1977;Gilbert & Williamson, 1978;Williamson, 1983;Commins & Salt, 1988;Salt, 1989). Different assemblages of species might produce different results on the prey selection by Asplanchna (Commins & Salt, 1988).…”

Section: Introductionmentioning

confidence: 99%

“…A majority of gut-content studies of field-captured A. girodi considered prey species as the criterion to study prey selection, because of the ease with which a qualitative description can be obtained. Data for field-collected A. girodi should ideally be supplemented with data from ambient plankton samples (Commins & Salt, 1988). Field-collected A. girodi might show some variations in gut contents, depending on the time that lapsed between collection and preservation (Sarma, 1993).…”

Section: Introductionmentioning

confidence: 99%

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Prey selection by Asplanchna girodi (Rotifera): the importance of prey defence mechanisms

Conde‐Porcuna

Sarma

1995

Freshwater Biology

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1. Predator (laboratory-grown Asplanchna girodi) and prey (several field-collected noncarnivorous rotifer species) interactions were studied in the laboratory as a function of both predator and prey densities. The clearance rates of A. girodi decreased with increasing prey density. Predator density had no effect on the feeding of A. girodi. 2. Asplanchna girodi selectively fed on Keratella cochlearis. Its clearance rates for K. cochlearis were much higher than those for Polyarthra and Brachionus. Short-spined forms (spine length less than 25 |im) showed a significantly higher susceptibility to predation than either the non-spined or the long-spined forms. 3. Large Asplanchna individuals fed selectively on reproductive females of K. cochlearis, thereby reducing the fecundity of their prey.

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Section: Discussioncontrasting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prey selection by Asplanchna girodi (Rotifera): the importance of prey defence mechanisms

Conde‐Porcuna

Sarma

1995

Freshwater Biology

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“…Most research on predatory rotifers has focused on planktonic forms, especially Asplanchna (e.g ., Commins & Salt, 1988 ;Gilbert & Jack, 1993 ;Sarma, 1993 ;Salt, 1987 ; references therein) . Unfortunately, little information is available on prey capture by sessile species (Wallace, 1980) .…”

Section: Introductionmentioning

confidence: 99%

Predatory behavior of Cupelopagis vorax (Rotifera; Collothecacea; Atrochidae) on protozoan prey

1995

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By rotating on a short, flexible, pedal stalk, Cupelopagis vorax captures prey that traverse the substratum to which this sessile rotifer attaches . Microvideographic analysis (including slow motion and freeze-frame) permitted us to examine some of the details of Cupelopagis foraging behavior. When undisturbed, Cupelopagis usually faces forward in a resting or neutral position (NP) with its unciliated infundibulum (corona) directed parallel to the surface of the substratum. However, vibrations produced by artificial means (fine pins) or small prey (protists) evoke unique behaviors in Cupelopagis . Our analysis of Cupelopagis foraging on two protozoan prey (Paramecium bursaria and a small, unidentified flagellate, SUF) indicates that this predator possesses a 360 ° encounter field (EF) biased towards the NP Size of the EF appears to be a function of both predator and prey size, but it extends at least 650 µm, as measured from the point of attachment of the predator's pedal stalk to the substratum . When a prey comes close to Cupelopagis, this predator can lean toward the organism, stretching forward on its pedal stalk and extending its corona over the prey in a swift motion (< 0 .5 s) . Probability of capture after attack was a function of prey type (61 .6% for P. bursaria and 41 .5% for the SUF) . Analysis of prey capture by Cupelopagis indicates that this predator has a handling time ranging from a few seconds to several minutes : 24.6 ± 16 .8 s for P. bursaria (n = 274) and 34 .6 ± 25 .4 s for the SUF (n =111) . Occasionally Cupelopagis sweeps part of the EF by retracting its corona, turning to the right or left (mean angle subtended Pz~63 ° ± 42 °), unfolding the corona, and slowly returning to the original resting position . This behavior, termed surveillance, occurs in the presence or absence of prey . While not unique in its ability to detect water movements, Cupelopagis is the only rotifer known to exhibit specific behaviors to vibrations produced by potential prey.

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Food niches of planktonic rotifers: Diversification and implications

Gilbert

2022

Limnology & Oceanography

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The diverse diets of common planktonic rotifers are described in detail from field and laboratory observations and experiments. Also considered are methodological approaches, rotifer feeding mechanisms, and the availability in natural waters of less well-known food items (detritus, picoplankton, protozoans). Despite much variation among and within rotifer genera, food niches of planktonic rotifers can be subdivided into four broad, overlapping categories defined by the predominant types and sizes of food ingested: (1) microphagous rotifers that eat fine detritus/organic aggregates, picoplankton, and 2-10 μm nanoplankton; (2) polyphagous rotifers that eat the above items, larger nanoplankton, and small (20-50 μm) microplankton; (3) macrophagous algivores that eat 5-50 μm algae; and (4) macrophagous omnivores/predators that eat 5-250 μm algae, protozoans, and metazoans. These diet-based categories have ecological advantages over categories based on rotifer morphology or feeding mode. The information on diets assembled here is important for understanding: (1) the population dynamics of planktonic rotifers and their food organisms; (2) the position of rotifers in classical and microbial food webs;(3) the seasonality, spatial distribution, and species diversity of rotifers in plankton communities; and (4) food overlap, and thus potential resource competition, among planktonic protozoans, rotifers, and crustaceans.

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Some patterns of predation and prey selection by the rotifer Asplanchna girodi in replicated outdoor tanks

Cited by 5 publications

References 3 publications

Prey selection by Asplanchna girodi (Rotifera): the importance of prey defence mechanisms

Prey selection by Asplanchna girodi (Rotifera): the importance of prey defence mechanisms

Predatory behavior of Cupelopagis vorax (Rotifera; Collothecacea; Atrochidae) on protozoan prey

Food niches of planktonic rotifers: Diversification and implications

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