Dispersal without errors: symmetrical ears tune into the right frequency for survival

Gagliano, Monica, Depczynski, Martial, Simpson, Stephen D., and Moore, James A.Y. (2008) Dispersal without errors: symmetrical ears tune into the right frequency for survival. Proceedings of the Royal Society of London Series B, Biological Sciences, 275 (1634). pp. 527-534.

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Abstract

Vertebrate animals localize sounds by comparing differences in the acoustic signal between the two ears and, accordingly, ear structures such as the otoliths of fishes are expected to develop symmetrically. Sound recently emerged as a leading candidate cue for reef fish larvae navigating from open waters back to the reef. Clearly, the integrity of the auditory organ has a direct bearing on what and how fish larvae hear. Yet, the link between otolith symmetry and effective navigation has never been investigated in fishes. We tested whether otolith asymmetry influenced the ability of returning larvae to detect and successfully recruit to favourable reef habitats. Our results suggest that larvae with asymmetrical otoliths not only encountered greater difficulties in detecting suitable settlement habitats, but may also suffer significantly higher rates of mortality. Further, we found that otolith asymmetries arising early in the embryonic stage were not corrected by any compensational growth mechanism during the larval stage. Because these errors persist and phenotypic selection penalizes asymmetrical individuals, asymmetry is likely to play an important role in shaping wild fish populations.

Item ID: 7061
Item Type: Article (Refereed Research - C1)
Keywords: fluctuating asymmetry; sound; dispersal; recruitment; population dynamics; otoliths
ISSN: 1471-2954
Date Deposited: 25 Mar 2010 02:46
FoR Codes: 06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069999 Biological Sciences not elsewhere classified @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
Citation Count from Web of Science Web of Science 17
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