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Article
Gaute Grønstøl, Auteur ; Marie Danielsen, Auteur ; Emily R. A. Cramer, Auteur ; Lars Erik Johannessen, Auteur ; Arild Johnsen, Auteur ; Emma Whittington, Auteur ; Jan T. Lifjeld, AuteurSperm cells are variable both within and among species. To be able to accurately measure sperm cells and understand their function, it is important that sperm cells are preserved in a manner that maintains their structural integrity. Formalin is[...]
Article
Emily R. A. Cramer, Auteur ; Melissah Rowe, Auteur ; Fabrice Eroukhmanoff, Auteur ; Jan T. Lifjeld, Auteur ; Glenn-Peter Sætre, Auteur ; Arild Johnsen, AuteurSperm swimming performance, including swimming speed and the proportion of motile cells, may strongly affect fertilization success. However, little is known about how methodological factors affect in vitro measurement of these parameters. We com[...]
Article
Emily R. A. Cramer, Auteur ; J. Jordan Price, AuteurPhysical constraints on animal signals can have important consequences for communication. For bird songs that include a trill, performance is physically constrained by a trade-off between the rate at which notes are repeated in the trill and the[...]
Article
Emily R. A. Cramer, Auteur ; Terje Laskemoen, Auteur ; Oddmund Kleven, Auteur ; Jan T. Lifjeld, AuteurIt is well documented that sperm size and structure varies considerably among avian species, but we know much less about the extent of intraspecific variation in sperm morphometry and its possible co-variation with somatic traits like body size [...]
