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Burger, B. V.; Smit, D.; Spies, H. S. C.; Schmidt, Christian; Schmidt, Ulrike; Telitsina, A. Y.; Grierson, G. R.

doi:10.1023/a:1010328331891

Cited by 17 publications

(2 citation statements)

References 23 publications

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“…Some of their unsaturated analogues have been occasionally reported from nature. Pentadecenone 16 is known from different Echinacea species [46] [47] and termites [48], and 17 is a constituent of the secretion of the ventral gland of the male dwarf hamster Phodopus sungorus [49]. The unusual sulfur compound 25 is an aroma volatile of kohlrabi [50], while 26 was not previously reported.…”

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confidence: 99%

Volatile Organic Compounds from Arctic Bacteria of the Cytophaga‐Flavobacterium‐Bacteroides Group: A Retrobiosynthetic Approach in Chemotaxonomic Investigations

Dickschat

Helmke

Schulz

2005

Chemistry & Biodiversity

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Volatile organic compounds emitted by different marine arctic strains of the Cytophaga-Flavobacterium-Bacteroides group were investigated by using a modified closed-loop stripping apparatus (CLSA). Seven of nine strains emitted volatiles, dominated by methyl ketones, in specific patterns. The methyl ketones were aliphatic saturated, or unsaturated, and comprised 12 to 18 C-atoms, sometimes with terminal Me branches. They were identified by GC/MS, retention-index calculations, derivatization with dimethyl disulfide for C=C bond location, and GC/FTIR to elucidate their uniform (Z)-configuration. The proposed structures of all methyl ketones were subsequently confirmed by synthesis, while the absolute configuration of chiral volatiles was elucidated by stereoselective synthesis. From retrobiosynthetic considerations, it was found that strain ARK10267 uses mainly valine, and strain ARK10063 mainly isoleucine for formation of starters for the ketone biosynthesis, which is correlated to fatty acid biosynthesis. Four strains (ARK10223, ARK10044, ARK10141, and ARK10146) use leucine. These separations are supported by phylogenetic affiliations based on 16S rRNA. Strain ARK10255b, in the course of this study found to be not a member of the Cytophaga-Flavobacterium-Bacteroides phylum, did not emit aliphatic ketones of medium chain length, but methionine-derived 4-(methylsulfanyl)butan-2-one and corresponding 4-(methylsulfanyl)butan-2-ol. Most of the compounds described have not been reported previously from nature.

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confidence: 99%

Volatile Organic Compounds from Arctic Bacteria of the Cytophaga‐Flavobacterium‐Bacteroides Group: A Retrobiosynthetic Approach in Chemotaxonomic Investigations

Dickschat

Helmke

Schulz

2005

Chemistry & Biodiversity

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“…In addition to negatively impacting our sample (ID female groups ultimately consisted of 4 (AL) and 2 (FR) females that were paired with an ejaculating male for pregnancy analysis), this observation has the potential to suggest that some mechanisms of non-visible communication [37–39] may differ according to photoperiod. Siberian hamsters communicate with olfactory cues through multiple secretions such as urine, feces, ventral glands, and sacculi glands [40–43]. Urinary [44] and ventral gland [45] compounds vary across photoperiod, but only in males.…”

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confidence: 99%

Food as a supplementary cue triggers seasonal changes in aggression, but not reproduction, in Siberian hamsters

Bailey

Rendon

O'Malley

et al. 2016

Physiology & Behavior

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Animals living in temperate regions prepare for harsh winter conditions by responding to environmental cues that signal resource availability (e.g., food, day length). Siberian hamsters (Phodopus sungorus) breed in long, summer-like days (LD, >14 h light), i.e., photoperiods, and undergo robust gonadal regression and become more aggressive when exposed to short, winter-like photoperiods that signal impending limited resources (SD, <10 h light). When hamsters are reared within an intermediate photoperiod (ID, 13.5 h light), they are re-productively active, but undergo gonadal regression in response to mild food restriction (FR) over 6–12 weeks. We hypothesized that short-term (1–2 weeks) FR inanID photoperiod would provide a signal of impending limited resources and initiate the seasonal increase in aggression typical of SD photoperiods, as well as alter reproductive behaviors in advance of gonadal regression. To test this, we housed male and female hamsters in LD or ID photoperiods, with ad libitum (AL) access to food or a 90%-AL ration. We tested aggressive behavior after one week and reproductive behavior after two weeks, and subsequently monitored females for pregnancy and litter production. Both sexes displayed increased aggression in the ID-FR treatment. Untreated male intruders were less likely to ejaculate when paired with ID females during reproductive encounters. ID-FR males were undergoing gonadal regression after two weeks, but were more likely to have ejaculated. Female pregnancy and litter characteristics were unaltered by treatment: females were equally likely to achieve pregnancy and produce comparable litters across treatment groups. Collectively, we demonstrate that a signal of diminishing resources in an ID photoperiod is sufficient to trigger seasonal aggression, but that hamsters are reproductively resilient to inhibitory environmental cues in the short term. Broadly, our findings provide an important context for exploring seasonal changes in behavior and physiology from an ultimate perspective.

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Are mammal olfactory signals hiding right under our noses?

Apps¹

2013

Naturwissenschaften

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Chemical communication via olfactory semiochemicals plays a central role in the social behaviour and reproduction of mammals, but even after four decades of research, only a few mammal semiochemicals have been chemically characterized. Expectations that mammal chemical signals are coded by quantitative relationships among multiple components have persisted since the earliest studies of mammal semiochemistry, and continue to direct research strategies. Nonetheless, the chemistry of mammal excretions and secretions and the characteristics of those semiochemicals that have been identified show that mammal semiochemicals are as likely to be single compounds as to be mixtures, and are as likely to be coded by the presence and absence of chemical compounds as by their quantities. There is very scant support for the view that mammal semiochemicals code signals as specific ratios between components, and no evidence that they depend on a Gestalt or a chemical image. Of 31 semiochemicals whose chemical composition is known, 15 have a single component and 16 are coded by presence/absence, one may depend on a ratio between two compounds and none of them are chemical images. The expectation that mammal chemical signals have multiple components underpins the use of multivariate statistical analyses of chromatographic data, but the ways in which multivariate statistics are commonly used to search for active mixtures leads to single messenger compounds and signals that are sent by the presence and absence of compounds being overlooked. Research on mammal semiochemicals needs to accommodate the possibility that simple qualitative differences are no less likely than complex quantitative differences to encode chemical signals.

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Cited by 17 publications

References 23 publications

Volatile Organic Compounds from Arctic Bacteria of the Cytophaga‐Flavobacterium‐Bacteroides Group: A Retrobiosynthetic Approach in Chemotaxonomic Investigations

Volatile Organic Compounds from Arctic Bacteria of the Cytophaga‐Flavobacterium‐Bacteroides Group: A Retrobiosynthetic Approach in Chemotaxonomic Investigations

Food as a supplementary cue triggers seasonal changes in aggression, but not reproduction, in Siberian hamsters

Are mammal olfactory signals hiding right under our noses?

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