Fluctuating asymmetry, mate choice and experimental designs

1997 ◽  
Vol 54 (4) ◽  
pp. 1030-1033 ◽  
Author(s):  
PERCY A. ROHDE ◽  
TROND AMUNDSEN ◽  
PEDER FISKE
Keyword(s):  
Mate Choice ◽  
Fluctuating Asymmetry ◽  
Experimental Designs

Mate choice by female red junglefowl: the issues of multiple ornaments and fluctuating asymmetry

1998 ◽  
Vol 55 (1) ◽  
pp. 41-50 ◽  
Author(s):  
J.DAVID LIGON ◽  
REBECCA KIMBALL ◽  
MICHELE MEROLA-ZWARTJES
Keyword(s):  
Mate Choice ◽  
Fluctuating Asymmetry ◽  
Multiple Ornaments ◽  
Red Junglefowl

scholarly journals The problem of measuring trait-preference correlations without disrupting them

2019 ◽  
Vol 30 (6) ◽  
pp. 1518-1521 ◽  
Author(s):  
David J Hosken ◽  
Alastair J Wilson
Keyword(s):  
Sexual Selection ◽  
Mate Choice ◽  
Selection Process ◽  
Genetic Correlations ◽  
Female Preference ◽  
Experimental Designs ◽  
Evolutionary Trajectory ◽  
Male Trait ◽  
Trait Preference ◽  
Kirkpatrick Model

Abstract A key element at the heart of the Fisher–Lande–Kirkpatrick model of the sexual selection process is the genetic correlation between (male) trait and (female) preference. The strength of this association is critical in determining a population’s evolutionary trajectory, which is why estimating its magnitude is so important. In the Lande model, the trait-preference correlation is solely established and maintained by mate choice, and although it is unclear how exclusively mate choice does this in nature, the experimental designs typically employed to measure trait-preference genetic correlations could be systematically weakening estimates by not allowing free mate choice (similarly with husbandry practices). The precise impact of the problem is unknown, and possibly unknowable, but simple solutions can be applied to ensure the accuracy of trait-preference correlation estimates is maximized.

scholarly journals Otolith fluctuating asymmetry: a misconception of its biological relevance?

2015 ◽  
Vol 72 (7) ◽  
pp. 2079-2089 ◽  
Author(s):  
Carlos Díaz-Gil ◽  
Miquel Palmer ◽  
Ignacio A. Catalán ◽  
Josep Alós ◽  
Lee A. Fuiman ◽  
...  
Keyword(s):  
Fluctuating Asymmetry ◽  
Bilateral Symmetry ◽  
Field Studies ◽  
Experimental Designs ◽  
Wild Populations ◽  
Negative Results ◽  
Individual Fitness ◽  
Wide Range ◽  
Hard Structures ◽  
Shed Light

Abstract For decades, disruption of the bilateral symmetry of body structures has been related to underperformance and, hence, to fitness. In fish, this concept coupled with the claimed evidence for increased fluctuating asymmetry (FA) of pairs of hard structures, such as otoliths under conditions of stress, has led to the use of otolith FA (OFA) as a proxy for individual fitness and population success. Interpreting those significant differences in OFA in relation to stress-inducing environments and using them to identify suboptimal conditions for survival is especially appealing in the context of, for example, assessing climate change using historical otolith collections. Despite several works that give evidence to support the usefulness of OFA approach, we report on a number of unpublished and published datasets from a wide range of both, wild populations and experimental designs that show no correlation between OFA and any of the usual indicators of fitness or between OFA and expected stress gradients. Our results suggest that there may be a strong bias in the published literature towards positive relationships, despite the enormous importance of negative results for understanding the significance of OFA. These results might shed light on the interpretability of OFA in both laboratory and field studies.

Effect of Computerized Auditory Training on Speech Perception of Adults With Hearing Impairment

2013 ◽  
Vol 20 (3) ◽  
pp. 91-106 ◽  
Author(s):  
Rachel Pizarek ◽  
Valeriy Shafiro ◽  
Patricia McCarthy
Keyword(s):  
Hearing Loss ◽  
Speech Perception ◽  
Literature Review ◽  
Low Cost ◽  
Experimental Designs ◽  
Auditory Training ◽  
Hearing Impairments ◽  
Communicative Disorders ◽  
And Training

Computerized auditory training (CAT) is a convenient, low-cost approach to improving communication of individuals with hearing loss or other communicative disorders. A number of CAT programs are being marketed to patients and audiologists. The present literature review is an examination of evidence for the effectiveness of CAT in improving speech perception in adults with hearing impairments. Six current CAT programs, used in 9 published studies, were reviewed. In all 9 studies, some benefit of CAT for speech perception was demonstrated. Although these results are encouraging, the overall quality of available evidence remains low, and many programs currently on the market have not yet been evaluated. Thus, caution is needed when selecting CAT programs for specific patients. It is hoped that future researchers will (a) examine a greater number of CAT programs using more rigorous experimental designs, (b) determine which program features and training regimens are most effective, and (c) indicate which patients may benefit from CAT the most.

Humans copy social information in mate choice decisions

2009 ◽  
Author(s):  
Skyler S. Place ◽  
Peter M. Todd ◽  
Lars Penke ◽  
Jens B. Asendorpf
Keyword(s):  
Mate Choice ◽  
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