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  • McDiarmid, C. S., et al. (författare)
  • Sexual coloration and sperm performance in the Australian painted dragon lizard, Ctenophorus pictus
  • 2017
  • Ingår i: J Evol Biol. - : Wiley. - 1010-061X. ; 30:7, s. 1303-1312
  • Tidskriftsartikel (refereegranskat)abstract
    • Theory predicts trade-offs between pre- and post-copulatory sexually selected traits. This relationship may be mediated by the degree to which males are able to monopolize access to females, as this will place an upper limit on the strength of post-copulatory selection. Furthermore, traits that aid in mate monopolization may be costly to maintain and may limit investment in post-copulatory traits, such as sperm performance. Australian painted dragons are polymorphic for the presence or absence of a yellow gular patch (bibs'), which may aid them to monopolize access to females. Previous work has shown that there are physiological costs of carrying this bib (greater loss of body condition in the wild). Here, we show that male painted dragons use this bright yellow bib as both an inter- and intrasexual signal, and we assess whether this signal is traded off against sperm performance within the same individuals. We found no relationship between aspects of bib colour and sperm swimming velocity or percentage of motile sperm and suggest that the bib polymorphism may be maintained by complex interactions between physiological or life-history traits including other sperm or ejaculate traits and environmental influences.
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3.
  • McDiarmid, Callum S., et al. (författare)
  • Sperm Sizer : a program to semi-automate the measurement of sperm length
  • 2021
  • Ingår i: Behavioral Ecology and Sociobiology. - : Springer Science and Business Media LLC. - 0340-5443 .- 1432-0762. ; 75:5
  • Tidskriftsartikel (refereegranskat)abstract
    • Research on sperm is incorporated into many areas of ecology and evolution including including sexual selection, reproductive physiology and ecotoxicology, as well as comparative studies in evolution and phylogenetics. Currently, producing data on sperm morphology involves several time-consuming steps, particularly photographing sperm and measuring their length (e.g. head, midpiece, tail and total sperm length). Here, we present Sperm Sizer, a freely available Java program that semi-automates the process of measuring sperm length along the centre of the sperm (including head, midpiece, tail and total length). We compare sperm measurements made with Sperm Sizer to those made with the widely used non-automated software ImageJ, for sperm from a single bird species (the long-tailed finch Poephila acuticauda), eight species of passerine bird and eight species of lizard, and provide examples demonstrating that the program can measure at least some mammalian, fish and mollusc sperm. Sperm length measurements from Sperm Sizer are highly correlated to those made using ImageJ, demonstrating that Sperm Sizer produces high quality sperm length data while taking drastically less time. Our data suggests that Sperm Sizer measurements could possibly be incorporated into existing large datasets with a small correction, although this will need to be assessed on a case-by-case basis. We suggest that generally, sperm image quality (high contrast, minimal overlap of sperm, etc.) will be more important than the shape of the sperm for whether or not Sperm Sizer is for whether or not Sperm Sizer can be employed for a given project.
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