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Male diet affects female fitness and sperm competition in human- and bat-associated lineages of the common bedbug, Cimex lectularius. | LitMetric

AI Article Synopsis

  • Research shows that sperm performance varies in different populations of bedbugs depending on their diet, which could either be due to environmental factors or genetic differences from natural selection.
  • In an experiment, male bedbugs were fed either their natural diet (bat or human blood) or the foreign diet, revealing that diet significantly impacted female fecundity and sperm competition results, especially in the human-associated lineage.
  • Overall, while bat blood improved sperm competitiveness and might promote gene flow, the diet's effects underscore the importance of environmental influences on reproductive processes and potential outcomes for population isolation.

Article Abstract

Sperm performance can vary in ecologically divergent populations, but it is often not clear whether the environment per se or genomic differences arising from divergent selection cause the difference. One powerful and easily manipulated environmental effect is diet. Populations of bedbugs (Cimex lectularius) naturally feed either on bat or human blood. These are diverging genetically into a bat-associated and a human-associated lineage. To measure how male diet affects sperm performance, we kept males of two HL and BL populations each on either their own or the foreign diet. Then we investigated male reproductive success in a single mating and sperm competition context. We found that male diet affected female fecundity and changed the outcome of sperm competition, at least in the human lineage. However, this influence of diet on sperm performance was moulded by an interaction. Bat blood generally had a beneficial effect on sperm competitiveness and seemed to be a better food source in both lineages. Few studies have examined the effects of male diet on sperm performance generally, and sperm competition specifically. Our results reinforce the importance to consider the environment in which sperm are produced. In the absence of gene flow, such differences may increase reproductive isolation. In the presence of gene flow, however, the generally better sperm performance after consuming bat blood suggests that the diet is likely to homogenise rather than isolate populations.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8324850PMC
http://dx.doi.org/10.1038/s41598-021-94622-6DOI Listing

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