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Carlson, David A.; Bernier, Ulrich R.; Sutton, Bruce D.

doi:10.1023/a:1022311701355

Cited by 260 publications

(67 citation statements)

References 31 publications

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“…The software XCALIBUR (ThermoFinnigan, Egelsbach, Germany) for Windows was used for data acquisition. Methylalkanes were characterized by the use of standard MS databases and diagnostic ions and by determining Kovats indices by the method of Carlson et al (30).…”

Section: Extraction and Transfer Of Compoundsmentioning

confidence: 99%

Surface hydrocarbons of queen eggs regulate worker reproduction in a social insect

Endler

Liebig

Schmitt

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

258

219

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A hitherto largely unresolved problem in behavioral biology is how workers are prevented from reproducing in large insect societies with high relatedness. Signals of the queen are assumed to inform the nestmates about her presence in the colony, which leads to indirect fitness benefits for workers. In the ant Camponotus floridanus, we found such a signal located on queen-laid eggs. In groups of workers that were regularly provided with queen-laid eggs, larvae, and cocoons, with larvae and cocoons alone, or with no brood, only in the groups with queen-laid eggs did workers not lay eggs. Thus, the eggs seem to inform the nestmates about the queen's presence, which induces workers to refrain from reproducing. The signal on queen-laid eggs is presumably the same that enables workers to distinguish between queen-and worker-laid eggs. Despite their viability, the latter are destroyed by workers when given a choice between both types. Queen-and worker-laid eggs differ in their surface hydrocarbons in a way similar to the way fertile queens differ from workers in the composition of their cuticular hydrocarbons. When we transferred hydrocarbons from the queen cuticle to worker-laid eggs, the destruction of those eggs was significantly mitigated. We conclude that queen-derived hydrocarbon labels inform workers about the presence of a fertile queen and thereby regulate worker reproduction.

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Section: Extraction and Transfer Of Compoundsmentioning

confidence: 99%

Surface hydrocarbons of queen eggs regulate worker reproduction in a social insect

Endler

Liebig

Schmitt

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

258

219

View full text Add to dashboard Cite

show abstract

“…Because determination of ⌬KI requires knowledge of the molecular weight of each hydrocarbon, a series of B͞E linked scanning experiments were performed to assist molecular ion identification (50). The KIs of branched alkanes were checked against published data (51), where possible, to confirm assignment of the branching positions. GC͞chemical ionization͞MS was also used to confirm molecular weight.…”

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confidence: 99%

Are variations in cuticular hydrocarbons of queens and workers a reliable signal of fertility in the antHarpegnathos saltator?

Liebig

Peeters

Oldham

et al. 2000

Proc. Natl. Acad. Sci. U.S.A.

252

196

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One of the key features of insect societies is the division of labor in reproduction between one or a few fertile individuals and many sterile nestmates that function as helpers. The behavioral and physiological mechanisms regulating reproduction in ant societies are still not very well understood, especially in species in which all colony members are reproductively totipotent. In the ponerine ant Harpegnathos saltator, queen-worker dimorphism is very limited, and a few mated workers reproduce (''gamergates'') once the founding queen becomes senescent. Worker oviposition is regulated by highly directed aggressive interactions among nestmates, who can recognize different levels of ovarian activity. We show that variations in cuticular hydrocarbons (CHC) correlate with oogenesis, both for queens and workers. 13,23-Dimethylheptatriacontane is present in egg-layers, but not in infertile workers and queens. Proportions of other CHCs vary as well, resulting in clear separation of the ants in a multivariate analysis. Egg-layers are characterized by an elongation of the chain length of CHCs. We used solid-phase microextraction to measure CHCs in live ants that were experimentally induced to start producing eggs. Over a period of 118 days, CHC profiles of infertile workers changed completely to that of reproductives. The effect of age can be excluded in this modification. This striking correlation of ovarian activity with CHC variation and its correspondence with the observed recognition behavior exhibited by the workers toward egg-laying nestmates suggests that CHCs serve as a fertility signal in the ant H. saltator, a reliable basis for regulating reproduction.A striking phenomenon in biology is the evolution of animal societies in which only a minority of individuals transfer their genes to future generations whereas all others give up personal reproduction and help rearing the offspring of relatives. Hamilton's kin selection theory explains why abstaining from reproduction can be evolutionarily stable. As long as the helpers contribute sufficiently to the reproductive success of relatives, they compensate for the loss of their own direct fitness (1). In ant societies, the queens usually produce all of the colony's offspring whereas the workers raise the brood to adulthood. Workers are morphologically divergent and lack a functional sperm reservoir in most species. They have retained functional ovaries and can lay unfertilized eggs that develop into males, but they usually only do this once their queen has died (reviewed in refs. 2 and 3). This worker infertility can result from either self-restraint or mutual control (4), because male production by workers in queenright colonies often has a negative effect on colony productivity.In situations in which the reproductive interests of queens and workers converge, worker oviposition can be regulated with a simple exchange of information. Many investigations have shown that queens affect the fertility of workers by pheromones (reviews in, e.g., refs. 5 and 6). Indeed, dire...

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“…To obtain a clearer result, enhanced MOCD was proposed and used to detect outliers in this dataset. As shown in Figure 3, the samples including 20,5,16,18,19,13,14,8,15,10, and 17 were normal samples, which had the smallest mean and STD values. We established MC prediction models using these 11 samples and used these models to observe other samples.…”

Section: Methods Validationmentioning

confidence: 99%

“…The detailed information was provided in the previous studies. [19][20][21][22] EMCOD was conducted on Dataset 4. As shown in Figure 5, the M/SD plot indicates that 18 samples are far from the original point and can be regarded as outliers.…”

Section: Methods Validationmentioning

confidence: 99%

See 1 more Smart Citation

An enhanced Monte Carlo outlier detection method

Zhang

Mao

et al. 2015

J Comput Chem

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Outlier detection is crucial in building a highly predictive model. In this study, we proposed an enhanced Monte Carlo outlier detection method by establishing cross-prediction models based on determinate normal samples and analyzing the distribution of prediction errors individually for dubious samples. One simulated and three real datasets were used to illustrate and validate the performance of our method, and the results indicated that this method outperformed Monte Carlo outlier detection in outlier diagnosis. After these outliers were removed, the value of validation by Kovats retention indices and the root mean square error of prediction decreased from 3.195 to 1.655, and the average cross-validation prediction error decreased from 2.0341 to 1.2780. This method helps establish a good model by eliminating outliers. © 2015 Wiley Periodicals, Inc.

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Cited by 260 publications

References 31 publications

Surface hydrocarbons of queen eggs regulate worker reproduction in a social insect

Surface hydrocarbons of queen eggs regulate worker reproduction in a social insect

Are variations in cuticular hydrocarbons of queens and workers a reliable signal of fertility in the antHarpegnathos saltator?

An enhanced Monte Carlo outlier detection method

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