Female choice by electric pulse duration: attractiveness of the males' communication signal assessed by female bulldog fish, Marcusenius pongolensis (Mormyridae, Teleostei)

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urn:nbn:de:bvb:355-epub-37250 Copy

Machnik, Peter ; Kramer, Bernd

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Date of publication of this fulltext: 05 Aug 2009 13:44

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Item type:	Article
Date:	30 May 2008
Institutions:	Biology, Preclinical Medicine > Institut für Zoologie > Alumni or Retired > Verhaltensbiologie und Verhaltensphysiologie (Prof. Dr. Bernd Kramer)
Identification Number:	Value Type 18515728 PubMed ID 10.1242/jeb.016949 DOI
Keywords:	electric organ discharge, sexual selection, sensory exploitation, sensory bias, playback stimulation, electrocommunication, handicap, predation pressure
Dewey Decimal Classification:	500 Science > 570 Life sciences 500 Science > 590 Zoological sciences
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Yes
Item ID:	3725

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Abstract

In adult males of the South African weakly electric bulldog fish, Marcusenius pongolensis, the duration of the electric organ discharge (EOD) increases with body size over lifetime. Although there is experimental support for intrasexual selection (male-male competition) having shaped the males' EOD pulse duration in evolution, nothing is known about intersexual selection, such as female choice. ...

Abstract

In adult males of the South African weakly electric bulldog fish, Marcusenius pongolensis, the duration of the electric organ discharge (EOD) increases with body size over lifetime. Although there is experimental support for intrasexual selection (male-male competition) having shaped the males' EOD pulse duration in evolution, nothing is known about intersexual selection, such as female choice. Playback of 25 natural male EODs of pulse duration varying from 320 μs (close to the average female value) to 716 μs, to eight female experimental subjects elicited approach, head butts and circling behaviour. The rate of head butts on the dipole electrode model increased significantly with stimulus pulse duration in seven out of eight experimental subjects. In ten experimental female subjects we contrasted the shortest playback pulse with simultaneous playback of one of four longer ones (424, 524, 628 and 716 μs). Pooled responses for all experimental subjects were stronger for the dipole playing back the longer pulse in a pulse pair. The difference in the number of head butts (Δhead butts) that were dealt the two dipoles per 60 s test session increased significantly with the difference in pulse duration (Δpulse duration). The increase followed a significant linear trend (P<0.0001). Similar results were obtained for Δassociation time, Δcircles with head butts, and Δcircles without head butts. These results suggest that a male's reproductive success is enhanced by longer, i.e. more attractive EODs, and that both intra- and intersexual selection must have played a significant role in shaping the EOD of male M. pongolensis.

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