UPA Perpustakaan Universitas Jember

Effects of male apparent length on female preference for absolute body size in Xiphophorus helleri

R. David MacLaren 1 - Personal Name

Female green swordtails (Xiphophorus helleri) pre-fer males of longer body and sword lengths, which may reflect perceptual constraints. Larger males project a larger image onto the female’s retina at a given viewing distance, which may elicit greater stimulation of the visual system and a stron-ger behavioral response. This study investigates the effects of male apparent size, as affected by proximity and sword length, on female preference for absolute body size in X. helleri.
Females were presented pairs of dummy males in ten treat-ments organized into six categories: (1) the Actual Length Control where identically sized males were held at different viewing distances from the female; (2) the Sword Compensation Treatment in which viewing distance and ap-parent length (body + sword) were held constant, pairing sworded with swordless dummies of equal total length; (3) the Body Length Preference Treatment where male distance from the female was held constant, while varying body size; (4) the Apparent (Sword) Length Preference Treatments where male distance from the female was held constant, while vary-ing sword length; (5) the Apparent Length Controls where body length, sword length, and viewing distances varied while holding apparent length constant; and (6) the Experimental Treatment in which the smaller-sworded male of the pair ap-peared larger. In each of the Actual Length Control, Body, and Sword Length Treatments, females preferred the closer, larg-er-bodied, and longer-sworded males, respectively. However, females exhibited preferences in neither any of the Apparent Size Control treatments nor any of the Sword Compensation
Treatment. Additionally, females in the Experimental Treatment preferred the apparently longer-sworded dummy to the male whose sword was actually longer. These results suggest that female preference for male body and sword length is based on the male’s apparent rather than actual size.

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Apparent size
Female preference
Sexual selection
Xiphophorus helleri

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NPP. 3509212D1000001

Effects of male apparent length on female preference for absolute body size in Xiphophorus helleri

R. David MacLaren 1 - Personal Name

Series Title

Call Number

Publisher

Collation

Language

ISBN/ISSN

Classification

Content Type

Media Type

Carrier Type

Edition

Subject(s)

Specific Detail Info

Statement of Responsibility

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