Chemical induction of mixis in the rotifer Synchaeta tremula

Timmermeyer, Nadine; Stelzer, Claus‐Peter

doi:10.1093/plankt/fbl052

Cited by 24 publications

(17 citation statements)

References 30 publications

(35 reference statements)

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“…According to the definition of AI systems by such common principles, their spread over a wide taxonomic range, including fungi, plants (algae), animals, and possibly even viruses, where host cell lysis may depend on the virus concentration, is not surprising (151)(152)(153)(154)(155)(156)(157)(158)(159). AI systems evolved several times independently.…”

Section: Discussionmentioning

confidence: 99%

Core Principles of Bacterial Autoinducer Systems

Hense

Schuster

2015

Microbiol Mol Biol Rev

158

156

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SUMMARY Autoinduction (AI), the response to self-produced chemical signals, is widespread in the bacterial world. This process controls vastly different target functions, such as luminescence, nutrient acquisition, and biofilm formation, in different ways and integrates additional environmental and physiological cues. This diversity raises questions about unifying principles that underlie all AI systems. Here, we suggest that such core principles exist. We argue that the general purpose of AI systems is the homeostatic control of costly cooperative behaviors, including, but not limited to, secreted public goods. First, costly behaviors require preassessment of their efficiency by cheaper AI signals, which we encapsulate in a hybrid “push-pull” model. The “push” factors cell density, diffusion, and spatial clustering determine when a behavior becomes effective. The relative importance of each factor depends on each species' individual ecological context and life history. In turn, “pull” factors, often stress cues that reduce the activation threshold, determine the cellular demand for the target behavior. Second, control is homeostatic because AI systems, either themselves or through accessory mechanisms, not only initiate but also maintain the efficiency of target behaviors. Third, AI-controlled behaviors, even seemingly noncooperative ones, are generally cooperative in nature, when interpreted in the appropriate ecological context. The escape of individual cells from biofilms, for example, may be viewed as an altruistic behavior that increases the fitness of the resident population by reducing starvation stress. The framework proposed here helps appropriately categorize AI-controlled behaviors and allows for a deeper understanding of their ecological and evolutionary functions.

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Section: Discussionmentioning

confidence: 99%

Core Principles of Bacterial Autoinducer Systems

Hense

Schuster

2015

Microbiol Mol Biol Rev

158

156

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“…The mechanism responsible for the induction of mixis has so far been determined only for a few species (Gilbert , ; Schroeder & Walsh ). Timmermeyer & Stelzer () indicated that mixis in Synchaeta tremula Müller 1786 (Monogononta) is mediated by chemicals whose appearance is associated with high population density. Likewise, Snell et al.…”

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confidence: 99%

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

Pajdak‐Stós

Fiałkowska

Kocerba‐Soroka

et al. 2014

Invertebrate Biology

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The monogonont rotifer Lecane inermis is commonly known as a facultative parthenogen. Unexpectedly, among numerous lineages we isolated from wastewater treatment plants (WWTP), only one was capable of sexual reproduction. We investigated why sex was so rare among L. inermis in WWTP. The reproductive modes of lineages derived from the sexual lineage were examined. Among all lineages, the fraction of those reproducing only asexually for 14 d was 0.39. In the subsequent round, the fraction of asexual lineages reached 0.61. The population growth rate of the parthenogenetic lineages was significantly higher than that of the sexual lineages. We simulated the fate of rotifer populations in WWTP by removing 10% of the experimental cultures each day. After 10 d of these conditions, the mean number of females was greater in parthenogenetic than in sexual lineages. After 20 d, only solitary dormant eggs remained in the sexual lineages. It therefore appears that the loss of sex may be attributed to the specific conditions of the WWTP. When there is no risk of desiccation and no need for dormancy, the fast-growing parthenogens outcompete lineages investing in costly sex. Furthermore, even if some resting eggs were deposited, they would be washed out from the system with the excess sludge.

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“…Among external factors thus far shown to influence mictic female production, crowding (high population density) is now known to be the signal for induction of mictic females in four species of Brachionus, two species of Epiphanes, Rhinoglena frontalis and Synchaeta tremula (Gilbert 1963(Gilbert , 2002(Gilbert , 2003a(Gilbert ,b, 2004Hino and Hirano 1976;Carmona et al 1993;Pourriot and Rougier 1999;Stelzer andSnell 2003, 2006;Schröder and Gilbert 2004;Timmeremeyer and Stelzer 2006), dietary tocopherol is the prerequisite signal in four species of Asplanchna (Gilbert and Thompson, 1968;Gilbert 1980Gilbert , 1992Gilbert and Confer 1986), and long photoperiod is the cue in Notommata and Trichocerca (Pourriot 1963;Cl ement and Pourriot 1973). In addition, high population density -mediated by a chemical released by A. brightwelli and A. sieboldi -increases the response to dietary tocopherol (Birky 1969) but decreases the response in N. copeus to long photoperiod (Cl ement and Pourriot 1973).…”

Section: Sourcementioning

confidence: 99%

Differences in life table demography among eight geographic populations of Brachionus calyciflorus (Rotifera) from China

Ma¹,

Xi²,

Zhang³

et al. 2010

Limnologica

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Age-specific survivorship and fecundity Life expectancy at hatching Generation time Net reproductive rate Intrinsic rate of population increase Proportion of sexual offspring Ecological differentiation a b s t r a c t Eight geographic populations of Brachionus calyciflorus collected from China in August 2007 were cultured at 18 1C, 23 1C and 28 1C with 3.0 Â 10 6 cells mL À1 of alga Scenedesmus obliquus to investigate their differences in life table demography. The results showed that the response in each of the life table demographic parameters (age-specific survivorship and fecundity, life expectancy at hatching, generation time, net reproductive rate, intrinsic rate of population increase and proportion of sexual offspring) to increasing temperature differed with geographic population. Life expectancy at hatching, generation time, net reproductive rate and intrinsic rate of population increase were all significantly influenced by temperature, geographic population and their interaction and indirectly affected by the changes in body size and egg volume of the rotifers; however, the proportion of sexual offspring produced by the rotifers was markedly influenced only by geographic population. Among all the combinations of temperature and geographic population, the generation times of Guangzhou and Hainan populations at 18 1C were the longest, and the intrinsic rate of population increase of the Tai'an population at 18 1C was the lowest. Among all the eight geographic populations, the proportion of sexual offspring produced by Xuzhou population was the highest. Although the higher proportions of sexual offspring produced by all the geographic populations of rotifers (9.7-41.1%) might lead to higher resting egg productions, and thus to wide spread of the rotifers among the eight geographic populations, their differences in life table demography might be regarded as the results of adaptation to the different environmental conditions faced by them in the field.

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Chemical induction of mixis in the rotifer Synchaeta tremula

Cited by 24 publications

References 30 publications

Core Principles of Bacterial Autoinducer Systems

Core Principles of Bacterial Autoinducer Systems

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

Differences in life table demography among eight geographic populations of Brachionus calyciflorus (Rotifera) from China

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