In many species, males can make rapid adjustments to ejaculate performance in response to sperm competition risk; however, the mechanisms behind these changes are not understood. Here, we manipulate male social status in an externally fertilising fish, chinook salmon (Oncorhynchus tshawytscha), and find that in less than 48 hr, males can upregulate sperm velocity when faced with an increased ri...

Antigens recognized by anti-gamma-seminoprotein (gamma-Sm) antibody and anti-prostate-specific antigen (PA) antibody were analyzed immunologically by Ouchterlony method and Western blotting method. The double immunodiffusion test demonstrated that anti-gamma-Sm antibody and anti-PA antibody reacted against an identical antigen in seminal fluid or prostate homogenate. In the immunoblotting exami...

The relationship between the sperm-coating antigens of rabbit seminal plasma and the phenomenon of decapacitation was studied using agar-gel diffusion, immuno-electrophoresis, chromatography on Sephadex G-200, and polyacrylamide vertical gel electrophoresis. Interpretation of data obtained with these techniques led to the conclusion that a sperm-coating antigen of seminal plasma origin possesse...