Download Advances in Chemical Signals in Vertebrates by Dietland Müller-Schwarze (auth.), Robert E. Johnston, PDF

By Dietland Müller-Schwarze (auth.), Robert E. Johnston, Dietland Müller-Schwarze, Peter W. Sorensen (eds.)

The box of olfactory learn and chemical communique is within the early phases of innovative swap, and plenty of facets of this revolution are mirrored within the chapters during this e-book. therefore, it may serve admirably as an updated reference. First, a variety of vertebrate teams and species are represented. moment, there are very good stories of particular issues and theoretical techniques to verbal exchange by means of odors, together with chapters on sign specialization and evolution in mammals, the evolution of hormonal pheromones in fish, alarm pheromones in fish, chemical repellents, the chemical indications considering endocrine responses in mice, and the debate over human pheromones. 3rd, there are interesting new findings provided in several particular subject parts, reminiscent of the chemis­ try out of pheromones in a variety of species (salamanders to elephants), the chemistry of proteins that regulate the discharge of pheromones, the molecular biology and body structure of detection, coding and reaction to scent indications, the consequences of expertise on sensitivity to odors, the function of genes of the immune approach in scent construction and in human mate selection, the functionality and belief of smell over-marks, the popularity of people and kinfolk by means of odors, the effect of odors on predator-prey interactions, and using odors to aid keep an eye on pests. This ebook is an offshoot of the 8th foreign Symposium on Chemical Sig­ nals in Vertebrates, held at Cornell collage in Ithaca, manhattan, July 20-25, 1997, hosted and arranged via Bob Johnston.

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2. Signaling Properties of Pheromones: Biophysics and Sensory Drive. Clearly, the ability of a signal to stimulate conspecific sensory systems must playa significant role in the specialization of pheromone systems that employ communicatory signals. This is a particularly critical issue in fish because of the extreme sensitivity and specificity of their olfactory receptors. The physiological efficacy of a sensory stimulus (or set of stimuli) may be increased by three biophysical mechanisms: (1) amplification (increasing stimulus production); (2) varying output to reduce sensory adaptation; and (3) optimizing the match between odorants produced and receptors available.

Pacific herring, [Order Clupeiformes]; roach, Rutilus ruUlus [Order Cypriniformes]) sharing a common guild (nonguarding, nonobligatory plant spawners) may on occasion exhibit some convergence of hormonal pheromones. Interestingly, although fish reproductive lifestyles are highly diverse, the steroids and F prostaglandins (PGFs) from which hormonal pheromones are derived appear highly conserved. For example, in all fish examined, estradiol-17f3 (E2) induces vitellogenesis 24 P. W. Sorensen and N.

The other components are a sulfated derivative of 17,2013P (I7,20I3P-20S) and androstenedione (AD), a 19-carbon precursor of androgens and estrogens. EOG and bioassay studies show that the olfactory system is remarkably sensitive (pM detection thresholds) to 17,20I3P, 17 ,20I3P-20S, and AD and that this sensitivity is highly specific. g. , 1990]). Because goldfish form bisexual aggregations, it seems likely that, throughout the preovulatory period, males are exposed at least intermittently to detectable concentrations of the three steroidal pheromone components, whose ratios are known to shift as the female undergoes final maturation.

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