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dc.contributor.authorVerena Stroblen_US
dc.contributor.authorLars Strauben_US
dc.contributor.authorSelina Bruckneren_US
dc.contributor.authorMatthias Albrechten_US
dc.contributor.authorJakkrawut Maitipen_US
dc.contributor.authorEleonora Kolarien_US
dc.contributor.authorPanuwan Chantawannakulen_US
dc.contributor.authorGeoffrey R. Williamsen_US
dc.contributor.authorPeter Neumannen_US
dc.description.abstract© 2019 Strobl et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Reproductive strategies can act as strong selective forces on reproductive traits of male insects, resulting in species-specific variation in sperm quantity and viability. For solitary bees, basic measures of sperm quantity and viability are scarce. Here we evaluated for the first time quantity and viability of sperm in male Osmia cornuta solitary bees at different times after emergence, and how they were affected by male body mass and environmental condition (laboratory or semi-field arena). Sperm viability immediately after adult emergence showed no significant difference compared to four day old individuals, suggesting that O. cornuta males are capable of mating immediately post emergence. However, sperm counts were significantly higher in four day old individuals from the semi-field arena when compared to newly emerged males. This might reflect a final phase of sperm maturation. Regardless of individual male age and body mass differences, O. cornuta males produced on average ~175’000 spermatozoa that were ~65% viable, which are both significantly lower compared to eusocial honeybees and bumblebees. Moreover, sperm quantity, but not viability, was positively correlated with male body mass four days after emergence, while no such relationship was detected immediately after emergence. Even though individuals maintained in semi-field conditions exhibited a significantly greater loss of body mass, experimental arena had no significant effect on male survival, sperm quality or total living sperm produced. This suggests that the proposed laboratory design provides a cost-efficient and simple experimental approach to assess sperm traits in solitary bees. In conclusion, our data suggest a reduced investment in both sperm quantity and quality by male O. cornuta, which appears to be adaptive in light of the life history of this solitary bee.en_US
dc.subjectAgricultural and Biological Sciencesen_US
dc.subjectBiochemistry, Genetics and Molecular Biologyen_US
dc.titleNot every sperm counts: Male fertility in solitary bees, Osmia cornutaen_US
article.title.sourcetitlePLoS ONEen_US
article.volume14en_US Mongkuts University of Technologyen_US Agroscope Reckenholz-Tanikonen_US of Bernen_US Universityen_US Agroscope Changins-Wadenswilen_US Mai Universityen_US
Appears in Collections:CMUL: Journal Articles

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