Why is sex so rare in <i>Lecane inermis</i> (Rotifera: Monogononta) in wastewater treatment plants?

Pajdak‐Stós, Agnieszka; Fiałkowska, Edyta; Kocerba‐Soroka, Wioleta; Sobczyk, Mateusz; Fyda, Janusz

doi:10.1111/ivb.12056

Cited by 10 publications

(7 citation statements)

References 30 publications

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“…Our research showed that all isolated L. tenuiseta strains were obligatory parthenogens, and only two of the 17 L. inermis strains appeared to be able to reproduce sexually. Their growth rate was lower in comparison with the obligatory parthenogenetic clones what is also consistent with our earlier results [23].…”

Section: Discussionsupporting

confidence: 93%

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Lecane tenuiseta (Rotifera, Monogononta) as the best biological tool candidate selected for preventing activated sludge bulking in a cold season

Fiałkowska

Pajdak‐Stós

Fyda

et al. 2016

Desalination and Water Treatment

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Section: Discussionsupporting

confidence: 93%

“…Additional valuable information emerging from selection experiments confirms our earlier observations that rotifers clones maintaining ability to sexual reproduction are very rare in activated sludge [23]. In particular, the proportion of sexual strains of Lecane rotifers in WWTPs is very low.…”

Section: Discussionsupporting

confidence: 80%

Lecane tenuiseta (Rotifera, Monogononta) as the best biological tool candidate selected for preventing activated sludge bulking in a cold season

Fiałkowska

Pajdak‐Stós

Fyda

et al. 2016

Desalination and Water Treatment

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“…Clones homozygous for this allele produced, but failed to respond to, the chemical crowding signal inducing mixis in sexually competent clones (Stelzer, ; see Section 4.1.1). Clones developing asexual lineages also have been isolated in populations of Lecane inermis from wastewater treatment plants (Pajdak‐Stós, Fiałkowska, Kocerba‐Soroksa, & Fyda, ), and in those of Epiphanes hawaiiensis from a high altitude lake in Hawaii (U.S.A.; Walsh et al, ).…”

Section: Sex In Natural Populationsmentioning

confidence: 99%

Variation in the life cycle of monogonont rotifers: Commitment to sex and emergence from diapause

Gilbert

2019

Freshwater Biology

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A review of research on life‐cycle events in field and laboratory populations of monogonont rotifers shows that there is great variation at multiple levels: (1) degree of sexual dimorphism; (2) occurrence and timing of sex; (3) propensity for sex during sexual periods; (4) factors controlling initiation of sex; and (5) timing and extent of emergence from diapause. There is no regular pattern where: (1) fertilised resting eggs hatch to start the growing season; (2) populations develop via female parthenogenesis during favourable conditions; and then (3) bisexual reproduction with resting‐egg production occurs during later, unfavourable conditions. Sexual reproduction in natural populations can occur throughout much of the growing season, be restricted to some period(s) during the growing season, or be completely absent. During sexual reproduction in both natural and laboratory populations, only some fraction of females produces males or resting eggs. This bet‐hedging strategy can prevent a population crash and permits future population growth via female parthenogenesis. Selection against sexual reproduction, and rapid loss of sex, can occur. Laboratory experiments with pond‐dwelling species have identified specific environmental factors that induce sex in different species: (1) increasing population density; (2) dietary tocopherol (vitamin E) and (3) long photoperiods. These factors generally are associated with favourable conditions for population growth and production of energy‐rich resting eggs: (1) large population size; (2) high probability of contacts between males and fertilisable females; and (3) nutritious diets. Endogenous factors can inhibit responses to these environmental inducers, and thus favour female parthenogenesis. The timing of resting‐egg hatching depends on: (1) occurrence of specific environmental conditions; (2) the minimum duration of obligate diapause; and (3) the genotype and physiology of females producing resting eggs. Hatching may occur shortly after oviposition, after a long diapause before or at the start of a new growing season, or throughout the growing season. Hatching can be massive and contribute substantially to population growth and genetic diversity. Areas for future research include: (1) determining the timing and extent of sex and resting‐egg hatching in more natural populations, especially those that are marine, benthic, sessile, and interstitial; and (2) identifying environmental and physiological factors controlling these events.

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“…The measured trait was body size of adults of the F1 generation. (Color figure online) , the sexual phase of the life cycle was never observed(Pajdak-Stós et al 2014)…”

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confidence: 99%

The temperature–size rule in a rotifer is determined by the mother and at the egg stage

et al. 2015

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In most ectotherms, compared with development at low temperatures, development at high temperatures results in the acceleration of maturation, which in turn results in a smaller size (temperature-size rule, TSR). It is not known at which developmental stages this thermal response is determined. We exposed different life stages of the rotifer Lecane inermis to 15, 20, or 25°C to determine whether the TSR in the F1 generation is governed by the thermal conditions experienced by the mothers (F0 generation) during their development, during egg production, or during the development of the eggs or hatchlings. We found that the adult size was affected by the thermal conditions experienced by the mothers and embryos, but not by the conditions during post-hatching growth. We suggest that the thermal plasticity producing the TSR in rotifers may reflect the joint impacts of a maternal effect and a direct effect of the environment during egg development. The two-point control of the TSR resembles the thermal determination of other biological phenomena, similar to the thermally determined sex determination in ectotherms. Our results contribute not only to better understanding the proximate mechanisms of TSR, but also to comprehending the general biological mechanisms of response to temperature, which is one of the most important ecological factors.

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Why is sex so rare in Lecane inermis (Rotifera: Monogononta) in wastewater treatment plants?

Cited by 10 publications

References 30 publications

Lecane tenuiseta (Rotifera, Monogononta) as the best biological tool candidate selected for preventing activated sludge bulking in a cold season

Lecane tenuiseta (Rotifera, Monogononta) as the best biological tool candidate selected for preventing activated sludge bulking in a cold season

Variation in the life cycle of monogonont rotifers: Commitment to sex and emergence from diapause

The temperature–size rule in a rotifer is determined by the mother and at the egg stage

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