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Changes in sex ratio over time in the endangered iguana Cyclura cychlura inornata

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Changes in sex ratio of a population over time can indicate possible conservation concerns. Using population estimates for males and females, we examined changes in the sex ratio of two populations of the endangered Allen’s Cay Rock Iguana (Cyclura cychlura inornata Barbour and Noble, 1916) in the Bahamas over nearly 25years. The sex ratios of both populations changed from strongly male-biased early in the study to nearly 1:1 in recent years. We hypothesize that this shift has occurred because of the recovery of these populations from intense harvesting (particularly of females) over the previous 100years and, more recently, because of the removal of large males from the islands either by poachers or by tourists.

Le changement du sex-ratio d’une population dans le temps peut être le signe de problèmes possibles de conservation. En utilisant des estimations démographiques pour les mâles et les femelles, nous avons examiné sur une période de presque 25 ans le sex-ratio de deux populations de l’iguane roche d’Allen’s Cay (Cyclura cychlura inornata Barbour et Noble, 1916), une espèce menacée des Bahamas. Le sex-ratio des deux populations qui favorisait fortement les mâles au début de l’étude est passé à près de 1:1 ces dernières années. Nous pensons que ce changement s’est produit parce que les populations se sont remises de la récolte intensive (particulièrement de femelles) au cours des 100 dernières années et, plus récemment, à cause du retrait des mâles de grande taille des îles par les braconniers ou par les touristes.
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Document Type: Research Article

Publication date: 2006-10-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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