Swanne P Gordon

Swanne P Gordon
Washington University in St. Louis | WUSTL , Wash U · Department of Biology

PhD.

About

36
Publications
8,580
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930
Citations
Introduction
Swanne P Gordon is currently an Assistant Professor of Biology at Washington University in St. Louis. Swanne does research in Behavior, Evolutionary Biology and Ecology.
Additional affiliations
September 2006 - September 2011
University of California, Riverside
Position
  • PhD Student
September 2005 - September 2007
McGill University
Position
  • Master's Student

Publications

Publications (36)
Article
Full-text available
Predator-induced plasticity in life-history and antipredator traits during the larval period has been extensively studied in organisms with complex life-histories. However, it is unclear whether different levels of predation could induce warning signals in aposematic organisms. Here, we investigated whether predator-simulated handling affects warni...
Article
Ecologists and evolutionary biologists are fascinated by life’s variation but also seek to understand phenomena and mechanisms that apply broadly across taxa. Model systems can help us extract generalities from amid all the wondrous diversity, but only if we choose and develop them carefully, use them wisely, and have a range of model systems from...
Article
Full-text available
Polymorphic warning signals in aposematic systems are enigmatic because predator learning should favor the most common form, creating positive frequency-dependent survival. However, many populations exhibit variation in warning signals. There are various selective mechanisms that can counter positive frequency-dependent selection and lead to tempor...
Article
Full-text available
Warning signals are predicted to develop signal monomorphism via positive frequency‐dependent selection (+FDS) albeit many aposematic systems exhibit signal polymorphism. To understand this mismatch, we conducted a large‐scale predation experiment in four countries, among which the frequencies of hindwing warning coloration of the aposematic moth,...
Preprint
Full-text available
Warning signals are predicted to develop signal monomorphism via positive frequency-dependent selection (+FDS) albeit many aposematic systems exhibit signal polymorphism. To understand this mismatch, we conducted a large-scale predation experiment in four locations, among which the frequencies of hindwing warning coloration of aposematic Arctia pla...
Article
Full-text available
1.Predation is an important selective pressure and some prey have evolved conspicuous warning signals that advertise unpalatability (i.e. aposematism) as an antipredator defence. Conspicuous colour patterns have been shown effective as warning signals, by promoting predator learning and memory. Unexpectedly, some butterfly species from the unpalata...
Preprint
1. Predation is an important selective pressure and some prey have evolved warning colour signals advertising unpalatability (i.e. aposematism) as an antipredator strategy. Unexpectedly, some butterfly species from the unpalatable tribe Ithomiini possess transparent wings, an adaptation rare on land but common in water where it helps avoiding preda...
Article
Full-text available
Polymorphic warning signals in aposematic organisms are puzzling because efficient predator learning should select for the most efficient warning colouration. Yet, there are many examples of polymorphic and aposematic organisms in nature. Here, we investigated whether perceived trade-offs between natural and sexual selection, combined with differen...
Article
Full-text available
Chemically defended animals often display conspicuous color patterns that predators learn to associate with their unprofitability and subsequently avoid. Such animals (i.e., aposematic), deter predators by stimulating their visual and chemical sensory channels. Hence, aposematism is considered to be "multimodal." The evolution of warning signals (a...
Article
Full-text available
Local warning colour polymorphism, frequently observed in aposematic organisms, is evolutionarily puzzling. This is because variation in aposematic signals is expected to be selected against due to predators' difficulties associating several signals with a given unprofitable prey. One possible explanation for the existence of such variation is pred...
Article
Full-text available
An increasingly large number of studies have demonstrated the ability of populations to undergo contemporary or rapid evolution. Little explored in this regard is the role of phenotypic plasticity, although it can influence eco-evolutionary dynamics and hence evolutionary rates. Here we quantify the evolution of life history and plasticity in Trini...
Article
Full-text available
Theory predicts that the sex linkage of sexually selected traits can influence the direction and rate of evolution and should itself evolve in response to sex-specific selection. Some studies have found intraspecific differences in sex linkage associated with differences in selection pressures, but we know nothing about how fast these differences c...
Article
Full-text available
Swim performance is considered a main fitness-determining trait in many aquatic organisms. Swimming is generally the only way most aquatic prey can escape predation, and swimming capacity is directly linked to food capture, habitat shifts, and reproduction. Therefore, evolutionary studies of swim performance are important to understand adaptation t...
Article
Full-text available
Predators efficiently learn to avoid one type of warning signal rather than several, making colour polymorphisms unexpected. Aposematic wood tiger moth males Parasemia plantaginis have either white or yellow hindwing coloration across Eu-rope. Previous studies indicate that yellow males are better defended from predators, while white males have a p...
Article
Full-text available
Evolutionary analyses of population translocations (experimental or accidental) have been important in demonstrating speed of evolution because they subject organisms to abrupt environmental changes that create an episode of selection. However, the strength of selection in such studies is rarely measured, limiting our understanding of the evolution...
Article
Full-text available
Polymorphic warning signals in aposematic species are enigmatic because predator learning and discrimination should select for the most common coloration, resulting in positive frequency-dependent survival selection. Here, we investigated whether differential mating success could create sufficiently strong negative frequency-dependent selection fo...
Article
Full-text available
Predators efficiently learn to avoid one type of warning signal rather than several, making colour polymorphisms unexpected. Aposematic wood tiger moth males Parasemia plantaginis have either white or yellow hindwing coloration across Europe. Previous studies indicate that yellow males are better defended from predators, while white males have a po...
Article
Full-text available
In semelparous populations, dormant germ banks (e.g. seeds) have been proposed as important in maintaining genotypes that are adaptive at different times in fluctuating environments. Such hidden storage of genetic diversity need not be exclusive to dormant banks. Genotype diversity may be preserved in many iteroparous animals through sperm-storage...
Article
Full-text available
Evolutionary theory predicts that the sex linkage of sexually selected traits can influence the direction and rate of evolutionary change, and also itself be subject to selection. Theory abounds on how sex-specific selection, mate choice, or other phenomena should favor different types of sex-linked inheritance, yet evidence in nature remains limit...
Article
The rate of evolution of mating preferences and mate signalling traits can influence local adaptation and diversification under environmental change. However, the rate of evolution of female preferences has not been directly examined in natural populations. An opportunity to do so arose through the introduction of high-predation Trinidadian guppies...
Article
We conducted 10 mark-recapture experiments in natural populations of Trinidadian guppies to test hypotheses concerning the role of viability selection in geographic patterns of male color variation. Previous work has reported that male guppies are more colorful in low-predation sites than in high-predation sites. This pattern of phenotypic variatio...
Article
Full-text available
Numerous studies of wild populations have shown that phenotypic traits can change adaptively on short timescales, but very few studies have considered coincident changes in major fitness components. We here examine adaptive changes in life-history traits and survival rates for wild guppies introduced into new environments. Female life-history trait...
Article
We use an experimental introduction in nature to examine factors that influence parallel evolution. In 1996, 200 high-predation guppies (Poecilia reticulata) from the Yarra River were introduced into the Damier River, which previously lacked guppies. Eight years later, we quantified the colour of wild-caught guppies ('phenotypic' divergence) and la...
Article
The interaction of subpicosecond KrF‐laser pulses with polished and colloidal metal surfaces at an intensity of 8×1015 W/cm2 was investigated experimentally. The measurements with spectral and temporal resolution for the colloidal targets showed a higher energy conversion efficiency into soft x rays and an increase in x‐ray pulse lengths. © 1996 Am...
Article
In this study, it was noted that ionization dynamics and plasma refraction are significant in the propagation of intense, ultrashort laser pulses in plasmas. By turning to more confined gas geometries, a higher gas density was achieved before strong refraction and beam breakup into filaments takes place. Self-channeling of the laser beam was not ac...
Article
Full-text available
We have demonstrated efficient conversion of ultrashort-pulse laser energy to x rays with energies above 1 keV, using laser-produced plasmas generated on a variety of microstructured surfaces. Lithographically produced grating targets generated 0.1 mJ of kilo-electron-volt x rays, and porous gold and aluminum targets emitted 1 mJ. This represents a...
Article
In this paper, we discuss recent advances in ultrashort-pulse X-ray technology. Femtosecond laser-plasma based X-ray sources can now generate sub-pico-second soft X-ray pulses, with photon energies from 10 eV to 106 eV, and with a high conversion efficiency of incident laser light to broadband X-rays. Recent advances in high-speed X-ray detectors a...
Article
Laser pulses with high intensity (up to 1018 W/cm2) and short duration (100 fs) were focused on gases and solids. The result was ionized material, and emission of short pulse x-rays and unicycle electromagnetic pulses with subpicosecond duration.
Article
Laser pulses with high intensity (up to 1018 W/cm2) and short duration (100 fs) were focused on solids. The result was highly ionized material and hot electrons, along with the emission of short pulse x-rays and unicycle electromagnetic pulses with subpicosecond duration.
Article
Current x-ray lasers operate in the 35 to 500 [Angstrom] wavelength regimes with 21.5 A being the limit for the successful collisional excitation approach using Nickel-like ions. In this paper, we discuss an x-ray laser scheme in the 5 to 15 [Angstrom] regime. The scheme uses an ultra-short (100 fsec FWHM) intense (10[sup 17] Watts/cm[sup 2]) laser...
Article
Full-text available
We demonstrate a new technique for enhancing the absorption of high‐intensity, ultrashort‐duration laser pulses by solids. Targets consisting of gold gratings and gold clusters were found to absorb greater than 90% of the incident high‐intensity laser light. This is in contrast to less than 10% absorption by flat surfaces. As a result of this stron...
Conference Paper
Laser pulses with terawatt intensities and 100 femtosecond duration are focused onto gas and solid targets. Strong emission of coherent Terahertz radiation is observed.

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Projects

Projects (3)
Project
This project investigates multiple selection forces that aposematic and colour polymorphic wood tiger moth face in the wild. This system helps us to understand how predation by birds, diseases, sexual selection and thermoregulation shape phenotypes of individuals.
Archived project
To characterise the chemical defenses of the wood tiger moth, and their variation both within and between populations.
Project
Guppy color patterns have usually been described as total size or number of particular color spots. However, male guppies actually inherit a complete color pattern from their fathers. Using mark-recapture of an introduction population, I am following how the 30 original patterns are changing in response to frequency dependent sexual selection. I am also testing whether the increase in color is due to changes within patrilines or a sorting of patrilines (with less colorful lineages disappearing from the population).