The susceptiblity of <i>Keratella cochlearis</i> to interference from small cladocerans

Gilbert, John J.; MacIsaac, Hugh J.

doi:10.1111/j.1365-2427.1989.tb01106.x

Cited by 34 publications

(25 citation statements)

References 14 publications

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“…This pattern of decreasing susceptibility with increasing body size is consistent with previously published results. Adults of K. cochlearis were much less likely to be killed or eaten by Ceriodaphnia dubia than newborns (Gilbert & MacIsaac, 1989). Similarly, the susceptibility of three species of Keratella to D. pulex (c. 2.5 mm) decreased as the total body length of the species increased-from K. cochlearis f. tecta (105 lm) to K. cochlearis f. typica (130 lm) to K. testudo (160 lm) to K. crassa (190 lm); K. crassa was about ten times less susceptible than K. cochlearis f. tecta (Gilbert, 1988a).…”

Section: Resultsmentioning

confidence: 98%

Daphnia–rotifer interactions in Patagonian communities

Diéguez

Gilbert

2010

Hydrobiologia

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In fishless ponds of extra-Andean Patagonia, large Daphnia often may severely limit the abundance of small rotifers by mechanical interference (ingestion and damage after rejection). In ten laboratory experiments, 15-20 rotifers were exposed to one large daphniid for 1 day in 80 ml water with Cryptomonas erosa (5 9 10 3 cells ml -1 ). Both D. cf. pulex (3.6 mm) and D. cf. obtusa (3.4 mm) imposed significant mortality on Keratella tropica and newborn Brachionus angularis and Brachionus calyciflorus, but not on the larger neonates of Brachionus rubens or adults of B. angularis and B. calyciflorus. B. rubens neonates avoided the possibility of interference by rapidly attaching to Daphnia. The number of susceptible rotifers killed per Daphnia day -1 was 2-8 for D. cf. obtusa and 8-15 for D. cf. pulex; rotifer-based clearance rates per Daphnia day -1 were 10-35 and 35-65 ml, respectively. When large daphniids occurred in Laguna Los Juncos in late September and October 1997, the only common plankton rotifer was the large and probably well-protected Keratella morenoi (total length = 210 lm). Still, microscopic examination of gut contents revealed three K. morenoi in a 3-mm D. cf. obtusa and one in a 3.5-mm D. dadayana.

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Section: Resultsmentioning

confidence: 98%

Daphnia–rotifer interactions in Patagonian communities

Diéguez

Gilbert

2010

Hydrobiologia

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“…Also, when cladoceran biomass was used as a covariate in order to remove this source of variation, there was at best a small improvement in the overall fit of the ANOVA model (with the covariate, an ANCOVA model) and the biomass covariate was never significant. It has been shown (Burns & Gilbert, 1986b;Gilbert, 1988a;Maclssac & Gilbert, 1989) that interference of cladocerans on rotifers increases with cladoceran body size. and a similar phenomena appears to be operating with ciliates.…”

Section: Discussionmentioning

confidence: 99%

“…As predicted by previous laboratory studies, this rotifer was suppressed by large Daphnia without evidence of the suppression of a shared algal resource. It has been demonstrated that at lengths less than 1.2 mm, Daphnia interference effects on K. cochlearis {tecla form) are negligible (Bums & Giibert, 1986b) and that K. cochlearis can coexist with or even exclude medium and small cladocerans (Maclssac & Gilbert, 1989). The mean size of D. galeafa mendofae (no more than 1310 nm) in the enclosure experiment is small enough that most members of the population may net have been capable of inflicting any direct mortality on K. cochlearis.…”

Section: Discussionmentioning

confidence: 99%

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Relative vulnerabilities of natural rotifer and ciliate communities to cladocerans: laboratory and field experiments

Wickham

Gilbert

1991

Freshwater Biology

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SUMMARY. 1. Two experiments with plankton communities from Storrs Pond (NH), one conducted in the laboratory and one in field enclosures, assessed the impact of different cladocerans on rotifers and ciliated protozoa.2. The smallest cladoceran, Bosmina longirostris, did not depress rotifer or ciliate growth rates while the intermediate sized cladoceran, Daphnia galeata mendotae, reduced ciliate growth rates in the enclosure experiment but had only a marginal effect in the jar experiment. D. galeata mendotae had no effect on any of the rotifers in either experiment.3. In both experiments the largest cladoceran, Daphnia pulex, depressed the growth rates of ciliates and those rotifers known to be vulnerable to interference competition. Polyarthra vulgaris, previously shown to be resistant to cladoceran interference, was the only rotifer unaffected by D. putex in the field experiment but was depressed by the much higher densities of this cladoceran in the laboratory experiment.4. Cladocerans did not affect phytoplankton or bacterioplankton abundance in either experiment. Therefore the mechanism most likely to be responsible for the suppressive effect of cladocerans on rotifers and ciliates in these experiments is direct mechanical interference or predation, rather than exploitative competition.

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“…Nevertheless, when cladocerans and copepods were simultaneously abundant, their top-down control on ciliates might have declined, as the total of both ciliate abundance and biomass were lower in CONTROL than in FILTER but were relatively higher than those in CLAD and COPE. This may have been caused by the interference and exploitative competition among the metazoan zooplankton groups (copepods, cladocerans, and rotifers) (Gilbert and MacIsaac 1989;MacIsaac and Gilbert 1991).…”

Section: Discussionmentioning

confidence: 99%

The Impacts of Crustacean Zooplankton on a Natural Ciliate Community: a Short-term Incubation Experiment

Yang

Chen

et al. 2017

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Abstract. Direct and indirect effects of crustacean zooplankton (cladocerans and copepods) are important regulators of ciliate communities, especially in eutrophic systems. However, it is not clear whether pseudodiaptomids (e.g., Schmackeria), one of the dominant calanoid copepods in Chinese lakes, effectively impacts natural ciliate communities. The impacts of small-bodied cladocerans (e.g., Bosmina) on ciliates are also controversial.We performed an incubation experiment using winter lake water from Lake Chaohu to assess the structuring effects that crustacean zooplankton have on natural ciliate populations. The presence and absence of cladocerans (Bosmina sp.) and copepods (Schmackeria inopinus) were alternated in four treatments.Both Bosmina sp. and Schmackeria inopinus had substantial impacts on ciliate abundance, biomass, and community structure. The response of ciliates was different in the presence of Bosmina sp. compared with Schmackeria inopinus and varied among categories such as the ciliate population, relative body size and functional feeding group. Our results also highlight the importance of interference and exploitative competition among metazooplankton groups.

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The susceptiblity of Keratella cochlearis to interference from small cladocerans

Cited by 34 publications

References 14 publications

Daphnia–rotifer interactions in Patagonian communities

Daphnia–rotifer interactions in Patagonian communities

Relative vulnerabilities of natural rotifer and ciliate communities to cladocerans: laboratory and field experiments

The Impacts of Crustacean Zooplankton on a Natural Ciliate Community: a Short-term Incubation Experiment

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