Experimental study of the interspecific competition between two sibling marine herbivorous rotifers in relation to food availability and initial population density

Divya, Sasidharan Padmaja; Kathiresan, K.; Asha, Padmaja; Sekar, Vaithilingam; Rajasekaran, R.

doi:10.1007/s13131-012-0225-9

Cited by 4 publications

(3 citation statements)

References 43 publications

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“…micrura did in cocultures, although the biomasses of the two cladocerans were suppressed by the competition (Figs 1 and 2 ). This is in accordance with the previous conclusion that abundant edible food favours the larger species to be superior competitor 25 – 27 . On condition that the carbon levels satisfy the food requirements of the animals, large species gathers food more efficiently, thereby decreasing the food availability of small species 28 .…”

Section: Discussionsupporting

confidence: 93%

Microcystis aeruginosa strengthens the advantage of Daphnia similoides in competition with Moina micrura

Tang

Hou

Xue

et al. 2017

Sci Rep

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Microcystis blooms are generally associated with zooplankton shifts by disturbing interspecific relationships. The influence of Microcystis on competitive dominance by different sized zooplanktons showed species-specific dependence. We evaluated the competitive responses of small Moina micrura and large Daphnia similoides to the presence of Microcystis using mixed diets comprising 0%, 20%, and 35% of toxic M. aeruginosa, and the rest of green alga Chlorella pyrenoidosa. No competitive exclusion occurred for the two species under the tested diet combinations. In the absence of M. aeruginosa, the biomasses of the two cladocerans were decreased by the competition between them. However, the Daphnia was less inhibited with the higher biomass, suggesting the competitive dominance of Daphnia. M. aeruginosa treatment suppressed the population growths of the two cladocerans, with the reduced carrying capacities. Nonetheless, the population inhibition of Daphnia by competition was alleviated by the increased Microcystis proportion in diet. As a result, the competitive advantage of Daphnia became more pronounced, as indicated by the higher Daphnia: Moina biomass ratio with increased Microcystis proportions. These results suggested that M. aeruginosa strengthens the advantage of D. similoides in competition with M. micrura, which contributes to the diversified zooplankton shifts observed in fields during cyanobacteria blooms.

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Section: Discussionsupporting

confidence: 93%

Microcystis aeruginosa strengthens the advantage of Daphnia similoides in competition with Moina micrura

Tang

Hou

Xue

et al. 2017

Sci Rep

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“…Food concentration plays an important role in the competitive shifts amongst many zooplankton species (Romanovsky and Feniova, ; Nandini et al, ). Divya et al () observed a reversal in competitive dominance from the smaller B. rotundiformis to larger B. plicatilis as the food levels increased. When the carbon level can satisfy the food requirements of Daphnia , large‐bodied species gather food more efficiently, thereby decreasing the food availability for smaller species (Lampert and Sommer, ).…”

Section: Discussionmentioning

confidence: 99%

“…The initial relative abundance of competing taxa affects the outcome of competition amongst cladocerans and rotifer species (Sarma et al, ; Nandini et al, ). Divya et al () found that under lower food level and higher initial density, the smaller rotifer Brachionus rotundiformis had adverse effects on the peak abundance of the larger Brachionus plicatilis . However, Euchlanis dilatata outcompeted Brachionus patulus regardless of food level and initial inoculation density (Nandini and Sarma, ).…”

Section: Introductionmentioning

confidence: 99%

Food availability and initial relative abundance determine the outcome of interspecific competition between two different‐sized cladocerans

Chen

Tang

Zhao

et al. 2016

Internat. Rev. Hydrobiol.

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Competition amongst different‐sized cladocerans has attracted the interest of many researchers because of their similar life strategies and overlap in feeding habits. To test the combined effects of food concentration and initial relative abundance on the competition outcomes between small‐ and large‐bodied cladocerans, we grew large Daphnia magna and small Moina micrura with two initial relative abundances under five algal densities. At the lowest food concentration (0.10 mg L−1 carbon), D. magna could not maintain a population in the presence or absence of M. micrura. Under conditions in which both species grew together, food levels as high as 0.30 mg L−1 favoured superior population growth of D. magna, irrespective of inoculation abundance. Under conditions in which both species had equal initial abundance, population growth of M. micrura was inhibited by the presence of Daphnia at ≥0.30 mg L−1 food levels. M. micrura was superior to D. magna at higher food concentrations (≥0.60 mg L−1) and high initial abundance. These results suggest that population growth of large Daphnia was more successful than that of small Moina when the food availability was low, while the small Moina dominated under conditions of high initial abundance and high food supply. Therefore, interspecific competition amongst cladocerans depends not only on the size of competing species, but also on their initial relative abundance and food availability.

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Competition betweenBrachionus calyciflorusandBrachionus angularis(Rotifera) in relation to algal food level and initial population density

Zhang

Wan

2019

Ann. Limnol. - Int. J. Lim.

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Intensive interspecific competition for limited resource often can result in the exclusion of inferior competitors, decrease the species diversity and alter the structure of the zooplankton community. Competitive experiments between Brachionus calyciflorus and Brachionus angularis were conducted at three Scenedesmus densities (0.5 × 106, 1.0 × 106 and 2.0 × 106 cells ml−1) and four initial inoculation densities (numerically, 100% B. calyciflorus, 75% B. calyciflorus and 25% B. angularis, 50% each of the two species, 25% B. calyciflorus and 75% B. angularis, and 100% B. angularis). The results showed that at the low food level, B. angularis outcompeted B. calyciflorus and vice versa at the high food levels. At the intermediate food level, B. angularis was displaced by B. calyciflorus at nearly all the initial inoculation densities except for 75% B. angularis, at which both species coexisted until the termination of the experiment. When grown alone at 0.5 × 106, 1.0 × 106 and 2.0 × 106 cells ml−1 of Scenedesmus, B. calyciflorus reached the peak abundance values of 34 ± 4, 69 ± 5 and 101 ± 9 individuals ml−1 and had population growth rates of 0.608 ± 0.032, 0.654 ± 0.033 and 0.518 ± 0.039 d−1, respectively. The corresponding values for B. angularis were 265 ± 8, 330 ± 30 and 802 ± 87 individuals ml−1 and 0.623 ± 0.020, 0.770 ± 0.036 and 0.871 ± 0.013 d−1. The results suggest that the outcome of competition depends not only on the size of the competing species and food availability but also on their colonizing density.

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Experimental study of the interspecific competition between two sibling marine herbivorous rotifers in relation to food availability and initial population density

Cited by 4 publications

References 43 publications

Microcystis aeruginosa strengthens the advantage of Daphnia similoides in competition with Moina micrura

Microcystis aeruginosa strengthens the advantage of Daphnia similoides in competition with Moina micrura

Food availability and initial relative abundance determine the outcome of interspecific competition between two different‐sized cladocerans

Competition betweenBrachionus calyciflorusandBrachionus angularis(Rotifera) in relation to algal food level and initial population density

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