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Sexing Sirenians: Validation of Visual and Molecular Sex Determination in Both Wild Dugongs (Dugong dugon) and Florida Manatees (Trichechus manatus latirostris)

Lanyon, J.M. and Sneath, H. and Ovenden, J.R. and Broderick, D. and Bonde, R.K. (2009) Sexing Sirenians: Validation of Visual and Molecular Sex Determination in Both Wild Dugongs (Dugong dugon) and Florida Manatees (Trichechus manatus latirostris). Aquatic Mammals, 35 (2). pp. 187-192.

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Organisation URL: http://www.aquaticmammalsjournal.org

Abstract

Sexing wild marine mammals that show little to no sexual dimorphism is challenging. For sirenians that are difficult to catch or approach closely, molecular sexing from tissue biopsies offers an alternative method to visual discrimination. This paper reports the results of a field study to validate the use of two sexing methods: (1) visual discrimination of sex vs (2) molecular sexing based on a multiplex PCR assay which amplifies the male-specific SRY gene and differentiates ZFX and ZFY gametologues. Skin samples from 628 dugongs (Dugong dugon) and 100 Florida manatees (Trichechus manatus latirostris) were analysed and assigned as male or female based on molecular sex. These individuals were also assigned a sex based on either direct observation of the genitalia and/or the association of the individual with a calf. Individuals of both species showed 93 to 96% congruence between visual and molecular sexing. For the remaining 4 to 7%, the discrepancies could be explained by human error. To mitigate this error rate, we recommend using both of these robust techniques, with routine inclusion of sex primers into microsatellite panels employed for identity, along with trained field observers and stringent sample handling.

Item Type:Article
Additional Information:© Western Illinois University.
Keywords:Dugong; Dugong dugon; Florida manatee; Trichechus manatus latirostris; visual sex; molecular sex; SRY; ZFX; ZFY.
Subjects:Aquaculture and Fisheries > Fisheries
Science > Biology > Genetics
Science > Zoology > Chordates. Vertebrates > Mammals
Deposited On:12 May 2011 07:02
Last Modified:19 Jul 2011 06:59

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