Salinity dependence of sexual and asexual reproduction in the rotifer Brachionus plicatilis

Lubzens, Esther; Minkoff, G.; Marom, S.

doi:10.1007/bf00397430

Cited by 87 publications

(55 citation statements)

References 12 publications

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“…The general hypothesis that repression of sexual reproduction was a general response to environmental stresses of many types (Lubzens et al, 1985;Snell, 1986;Snell and Boyer, 1988;Snell and Carmona, 1995;Preston et al, 2000;Xi and Feng, 2004;Marcial et al, 2005;Xi et al, 2007). Similar results were obtained in the present study for dieldrin, chlordecone and b-HCH.…”

Section: Resultssupporting

confidence: 91%

Responses in the population growth and reproduction of freshwater rotiferBrachionus calyciflorusto four organochlorine pesticides

Huang

Zha

et al. 2013

Ann. Limnol. - Int. J. Lim.

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-In China, although the production and use of organochlorine pesticides (OCPs) have been banned for decades, relatively high levels of OCP residues have still been found in some water bodies, and can result in adverse acute and chronic effects on zooplankton including rotifers, which have caused public concern for many years. Responses in the population growth and reproduction of freshwater rotifer Brachionus calyciflorus to four OCPs including aldrin, dieldrin, b-hexachlorocyclohexane (b-HCH) and chlordecone were studied by 3-day population growth and 4-day resting eggs (RE) production tests. In comparison with control, aldrin at 10 mg.L x1 , b-HCH at 1000 mg.L x1 and chlordecone at 0.05 mg.L x1 significantly increased the population growth rate (r); but aldrin at 100 mg.L x1 , dieldrin at 0.001 and 0.1 mg.L x1 , b-HCH at 0.1-100 mg.L x1 and chlordecone at 50 mg.L x1 markedly decreased it. Aldrin at concentrations higher than 1 mg.L x1 , dieldrin at 0.01 and 1000 mg.L x1 , b-HCH at concentrations 0.1 and higher than 1 mg.L x1 , and chlordecone at concentrations 0.005 and higher than 0.5 mg.L x1 significantly decreased the ratio of ovigerous females to non-ovigerous females (OF/NOF), but the reverse was true for aldrin at 0.1 mg.L x1 and b-HCH at 0.001 mg.L x1 . Dieldrin at 0.001, 0.01 and 1000 mg.L x1 significantly decreased the ratio of mictic females to amictic females (MF/AF), but b-HCH at 1 and 10 mg.L x1 highly significantly increased it. Dieldrin at 1000 mg.L x1 and b-HCH at concentrations higher than 10 mg.L x1 markedly decreased the fertilization rate (FR). Both aldrin and chlordecone have no significant effect on the MF/AF and FR of rotifers. Aldrin at concentrations higher than 1 mg.L x1 , dieldrin at lower than 0.1 and higher than 10 mg.L x1 , b-HCH at 1000 mg.L x1 and chlordecone at 0.005, 0.05 and 50.0 mg.L x1 significantly decreased the mictic rate (MR) of rotifers, but the reverse was true for b-HCH at 1 mg.L x1 . Aldrin at 10 mg.L x1 , dieldrin at 0.001, 0.1 and 1000 mg.L x1 , b-HCH at concentrations higher than 1 mg.L x1 and chlordecone at concentrations higher than 0.005 mg.L x1 markedly decreased RE production of rotifers, but b-HCH at 0.01 mg.L x1 significantly increased it. A clear dose-response relationship existed between the RE and the concentration of dieldrin, b-HCH and chlordecone, and the OF/NOF and the aldrin concentration. The RE and OF/NOF in rotifer population might be suitable endpoints for monitoring the low concentration of three OCPs (dieldrin, b-HCH and chlordecone) and aldrin, respectively.

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Section: Resultssupporting

confidence: 91%

Responses in the population growth and reproduction of freshwater rotiferBrachionus calyciflorusto four organochlorine pesticides

Huang

Zha

et al. 2013

Ann. Limnol. - Int. J. Lim.

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“…A lower percentage of sexual females in the marine rotifer B. plicatils were produced at 2-ppt salinity as compared to 10 ppt, and no sexual reproduction occurred at above 36 ppt, although asexual reproduction continued at a substantial rate [15]. Reduced food levels, as well as temperature and salinity extremes, reduced the reproduction by sexual females to a greater extent than asexual females in B. plicatils [16].…”

Section: Discussionmentioning

confidence: 88%

Effect of four organochlorine pesticides on the reproduction of freshwater rotifer Brachionus calyciflorus pallas

Xi¹,

Chu²,

Xu³

2007

Enviro Toxic and Chemistry

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Abstract-Effects of four organochlorine pesticides, including dichlorodiphenyltrichloroethane (DDT), dicofol, endosulfan, and lindane, on the reproduction of freshwater rotifer Brachionus calyciflorus were studied by 3-d population growth tests. Compared to the control, dichlorodiphenyltrichloroethane at 0.64 mg/L, dicofol at 0.8 and 1.2 mg/L, endosulfan at 7.0 mg/L, and lindane at 14.0 mg/L all significantly decreased the population growth rate of the rotifers. Dichlorodiphenyltrichloroethane at concentrations higher than 0.16 mg/L, dicofol at concentrations higher than 0.025 mg/L, endosulfan at concentrations higher than 0.875 mg/L, and lindane at 14.0 mg/L all significantly decreased the mictic rate of the rotifers. Dichlorodiphenyltrichloroethane at 0.24 and 0.32 mg/L increased significantly the fertilization rate, but DDT at 0.64 mg/L inhibited completely the occurrence of fertilized mictic females. Dichlorodiphenyltrichloroethane at 0.32 and 0.64 mg/L, dicofol at 1.2 mg/L, and endosulfan at 7.0 mg/L all significantly decreased the ratio of ovigerous females to nonovigerous females, but the reverse was true for lindane at 7.0 mg/L. Dichlorodiphenyltrichloroethane at 0.0025 and 0.01 mg/L increased significantly the ratio of mictic females to amictic females, but the reverse was true for dicofol at 0.8 mg/L. Both population growth rate and mictic rate of the rotifers were suitable endpoints for assessing the effects of the four organochlorine insecticides on the reproduction of the rotifers, and the latter was more sensitive.

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“…The hatched eggs usually develop into asexually reproducing amictic females (FA), until they encounter a mixis signal directing them to embark on sexual reproduction. The factors inducing the mixis signal in the Brachionus species complex are largely unknown, although population density, salinity, temperature, presence of pheromones and food availability were found to play a role (Lubzens et al, 1985;Lubzens & Zmora, 2003;Serra & King, 1999;Gilbert, 2004aGilbert, , 2007Hagiwara et al, 2005;Snell et al, 2006;Denekamp et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

The expression pattern of dormancy-associated genes in multiple life-history stages in the rotifer Brachionus plicatilis

et al. 2010

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Rotifer resting eggs retain their viability for several decades in a non-desiccated form and are of interest in discerning the processes associated with dormancy, since in most organisms this phenomenon is linked with desiccation. The expression pattern of candidate genes with biological functions associated with dormancy in several other organisms was examined in rotifers. High-throughput transcriptome profiling revealed three patterns of gene expression in resting eggs: (1) relatively highly expressed genes coding for LEA proteins and putative paralogs of the small heat shock protein family (shsp); (2) genes coding for ferritin (ferr), glutathione-6-transferase (gts) and HSP70, where some of the putative gene paralogs of these families show relatively high expression levels and other putative paralogs show relatively low expression levels in resting eggs; and (3) genes with relatively low expression levels in resting eggs, for trehalose-6-phosphate synthase (tps), fatty-acid binding proteins (fab) and of lipoprotein lipase (lpl) and the aquaporins gene family (aqp). Changes in the expression pattern of some members of putative gene families occurred during the obligatory dormant period of resting eggs. A transition was observed from an expression pattern of diapausing embryos to an expression pattern of amictic females, during hatching. Differences were also found in the expression pattern in the different types of females, especially in those carrying resting eggs, and in males compared with females. These results suggest putative functional significance to genes associated with dormancy in non-desiccated resting eggs. It could also be proposed that their occurrence in resting eggs is developmentally programmed to facilitate survival in case of desiccation.

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Salinity dependence of sexual and asexual reproduction in the rotifer Brachionus plicatilis

Cited by 87 publications

References 12 publications

Responses in the population growth and reproduction of freshwater rotiferBrachionus calyciflorusto four organochlorine pesticides

Responses in the population growth and reproduction of freshwater rotiferBrachionus calyciflorusto four organochlorine pesticides

Effect of four organochlorine pesticides on the reproduction of freshwater rotifer Brachionus calyciflorus pallas

The expression pattern of dormancy-associated genes in multiple life-history stages in the rotifer Brachionus plicatilis

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