Neotropic cormorant (Phalacrocorax brasilianus) is a monomorphic species widely distributed along the American Continent. We used a rapid and efficient molecular technique centred on the chromo-helicase-DNA-binding gene in order to differentiate male and female sex chromosomes based on the size of introns. Males presented a Z chromosome with a single band of 664 base pairs, and females presented the same band plus a shortest one corresponding to the W chromosome with 459 base pairs.

中文翻译：

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新热带鸬鹚（Phalacrocorax brasilianus）的分子性别鉴定

新热带鸬鹚 (Phalacrocorax brasilianus) 是一种单形物种，广泛分布于美洲大陆。我们使用了一种以染色体-解旋酶-DNA 结合基因为中心的快速有效的分子技术，以便根据内含子的大小区分男性和女性性染色体。男性呈Z染色体，单带664个碱基对，女性呈相同带外加一条最短的对应于W染色体的459个碱基对。