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. 2015 Mar 12;15:38. doi: 10.1186/s12862-015-0328-y

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© Arthur and Dyer; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Male progeny production. Offspring production of hybrid males relative to pure species and heterospecific crosses. Error bars indicate standard errors, and the numbers within the bars are the sample sizes. “Subo” refers to D. suboccidentalis, “Occ” refers to D. occidentalis, “F1(SxO)” are F1 hybrids from a D. suboccidentalis female, and “F1(OxS)” are F1 hybrids from a D. occidentalis female.