scholarly journals Direct detection of male quality can facilitate the evolution of female choosiness and indicators of good genes: Evolution across a continuum of indicator mechanisms

Evolution ◽  
2018 ◽  
Vol 72 (4) ◽  
pp. 770-784 ◽  
Author(s):  
Sumit Dhole ◽  
Caitlin A. Stern ◽  
Maria R. Servedio
Keyword(s):  
Direct Detection ◽  
Good Genes ◽  
Male Quality ◽  
Female Choosiness

scholarly journals Ornament Size and Symmetry: Is the tail a Reliable Signal of Male Quality in the Red-Collared Widowbird?

The Auk ◽  
2000 ◽  
Vol 117 (2) ◽  
pp. 366-372
Author(s):  
Keith W. Goddard ◽  
Michael J. Lawes
Keyword(s):  
Negative Relationship ◽  
Good Genes ◽  
Male Quality ◽  
Order Polynomial ◽  
Degree Of Confidence ◽  
Two Indices ◽  
Ornamental Traits ◽  
High Degree ◽  
The Relationship ◽  
Trait Size

Abstract Fluctuating asymmetry (FA) may provide a direct test of whether sexual selection via “arbitrary traits” or “good genes” is responsible for the evolution of epigamic traits, because FA is an epigenetic measure of stress during development. However, tests of the FA hypothesis have yielded equivocal results, and the debate between arbitrary traits and good genes continues. The FA hypothesis predicts a negative relationship between ornament size and asymmetry. In non-ornamental traits, a U-shaped relationship between trait size and asymmetry is expected. We tested these predictions in the Red-collared Widowbird (Euplectes ardens) by examining the relationship between size and asymmetry in the length of the tail, tarsus, and wing. We found no significant linear or second-order polynomial relationships between trait size and asymmetry. Furthermore, no relationship existed between asymmetry and two indices of body condition. This suggests that the tail is not a reliable signal of male quality in the Red-collared Widowbird. However, we argue that the assumptions of the FA hypothesis are too simplistic for this conclusion to be drawn with a high degree of confidence.

Mate Choice and Aerobic Capacity in Red Junglefowl

Behaviour ◽  
1997 ◽  
Vol 134 (7-8) ◽  
pp. 511-529 ◽  
Author(s):  
Timothy H. Kwan ◽  
Marlene Zuk ◽  
Mark A. Chappell ◽  
Torgeir S. Johnsen
Keyword(s):  
Aerobic Capacity ◽  
Mating Success ◽  
Function Analysis ◽  
Intestinal Parasites ◽  
Good Genes ◽  
Plasma Testosterone ◽  
Male Quality ◽  
Ascaridia Galli ◽  
Red Junglefowl ◽  
The Relationship

AbstractIn 'good genes' models of sexual selection, females choose mates whose genes confer increased survival value to offspring. One possible index of male quality is aerobic capacity (the metabolic basis of sustainable exercise), which is likely to be important for fitness. If it is both heritable and ecologically valuable, high aerobic capacity would be a direct signal of male genetic quality. If aerobic capacity is phenotypically plastic but dependent on health, it may provide an indirect index of male quality in other heritable traits (e.g. pathogen resistance). We examined the relationship between courtship behaviour, aerobic capacity (measured as maximum rates of oxygen consumption), and mating success in red junglefowl (Gallus gallus). We also tested the effects of intestinal parasites (the nematode Ascaridia galli) and plasma testosterone levels on aerobic capacity and behaviour. We found no relationship between testosterone and behaviour, mating success, or aerobic capacity. A. galli infection changed the relationship between mass and aerobic capacity; infected males had lower aerobic capacity than uninfected males, but only for small males. Discriminant function analysis suggested that aerobic capacity and display behaviour, together with male ornaments (comb size and colour), were the most important factors determining the mating success of males. However, aerobic capacity and display rate were not strongly correlated, and the manner by which females can discriminate among males with differing aerobic capacity is unclear.

Extrapair behaviour reveals flexible female choosiness and mixed support for classic good genes in blue-footed boobies

2014 ◽  
Vol 95 ◽  
pp. 145-153 ◽  
Author(s):  
Lynna Marie Kiere ◽  
Hugh Drummond
Keyword(s):  
Good Genes ◽  
Mixed Support ◽  
Female Choosiness

Detection and Characterization of earth-like Planets

1997 ◽  
Vol 161 ◽  
pp. 299-311 ◽  
Author(s):  
Jean Marie Mariotti ◽  
Alain Léger ◽  
Bertrand Mennesson ◽  
Marc Ollivier
Keyword(s):  
Direct Detection ◽  
Contrast Ratio ◽  
Angular Size ◽  
Physical Nature ◽  
Major Axis ◽  
Infrared Emission ◽  
Space Technology ◽  
Semi Major Axis ◽  
Earth Like Planets ◽  
Visible Wavelengths

AbstractIndirect methods of detection of exo-planets (by radial velocity, astrometry, occultations,...) have revealed recently the first cases of exo-planets, and will in the near future expand our knowledge of these systems. They will provide statistical informations on the dynamical parameters: semi-major axis, eccentricities, inclinations,... But the physical nature of these planets will remain mostly unknown. Only for the larger ones (exo-Jupiters), an estimate of the mass will be accessible. To characterize in more details Earth-like exo-planets, direct detection (i.e., direct observation of photons from the planet) is required. This is a much more challenging observational program. The exo-planets are extremely faint with respect to their star: the contrast ratio is about 10−10at visible wavelengths. Also the angular size of the apparent orbit is small, typically 0.1 second of arc. While the first point calls for observations in the infrared (where the contrast goes up to 10−7) and with a coronograph, the latter implies using an interferometer. Several space projects combining these techniques have been recently proposed. They aim at surveying a few hundreds of nearby single solar-like stars in search for Earth-like planets, and at performing a low resolution spectroscopic analysis of their infrared emission in order to reveal the presence in the atmosphere of the planet of CO H2O and O3. The latter is a good tracer of the presence of oxygen which could be, like on our Earth, released by biological activity. Although extremely ambitious, these projects could be realized using space technology either already available or in development for others missions. They could be built and launched during the first decades on the next century.

A novel enzyme immunoassay for the direct detection of H. pylori antigens in stool

2001 ◽  
Vol 120 (5) ◽  
pp. A492-A493 ◽  
Author(s):  
E HAINDL ◽  
H BENESCH ◽  
A FINCK ◽  
V MUEHISTEIN ◽  
A LEODOLTER ◽  
...  
Keyword(s):  
Enzyme Immunoassay ◽  
Direct Detection ◽  
H Pylori

Direct detection of heavy metal ions using liquid crystals

2020 ◽  
Author(s):  
Sulayman Oladepo
Keyword(s):  
Heavy Metal ◽  
Liquid Crystals ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Direct Detection

Good genes help racehorses to be winners

Nature ◽  
2007 ◽  
Author(s):  
Matt Kaplan
Keyword(s):  
Good Genes

Direct detection of HCV by solid phase hybridization with fluorescent probe

2001 ◽  
Vol 34 (0) ◽  
pp. 110
Author(s):  
E Ilina
Keyword(s):  
Fluorescent Probe ◽  
Solid Phase ◽  
Direct Detection

Influence of timing errors on the performance of direct-detection optical-fibre communication systems

1985 ◽  
Vol 132 (6) ◽  
pp. 309 ◽  
Author(s):  
J.J. O'Reilly ◽  
J.R.F. da Rocha ◽  
K. Schumacher
Keyword(s):  
Optical Fibre ◽  
Communication Systems ◽  
Direct Detection ◽  
Timing Errors ◽  
Optical Fibre Communication
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