Sperm

Even more functions of sperm RNA: a response to Hosken and Hodgson

As recently outlined in TREE [1], many animals and plants are thought to load their male gametes with multiple types of RNA, some of which enters the oocyte upon fertilization. Four classes of ultimate hypotheses for sperm RNA were proposed [1], …

Random sperm use and genetic effects on worker caste fate in Atta colombica leaf‐cutting ants

Sperm competition can produce fascinating adaptations with far‐reaching evolutionary consequences. Social taxa make particularly interesting models, because the outcome of sexual selection determines the genetic composition of groups, with attendant …

Sperm viability staining in ecology and evolution: potential pitfalls

The causes and consequences of variation in sperm quality, survival and ageing are active areas of research in ecology and evolution. In order to address these topics, many recent studies have measured sperm viability using fluorescent staining. …

Drosophila melanogaster seminal fluid can protect the sperm of other males

Many internally‐fertilizing animals produce seminal fluid which is transferred along with sperm during mating. Seminal fluid typically contains a diverse range of chemicals that coordinate sperm storage, moderate sperm motility, provide advantages in …

Sperm

Sperm competition, and evolution of sperm morphology

A sterile sperm caste protects brother fertile sperm from female-mediated death in Drosophila pseudoobscura

Spermicide (i.e., female-mediated sperm death) is an understudied but potentially widespread phenomenon that has important ramifications for the study of sexual conflict, postcopulatory sexual selection, and fertility. Males are predicted to evolve …

What use is an infertile sperm? A comparative test of parasperm function in sperm-heteromorphic Drosophila

Sperm size and number are important determinants of male reproductive success. The genus _Drosophila_ exhibits a remarkable diversity of sperm production strategies, including the production of multiple sperm morphs by individual males, a phenomenon …

Spermicide, cryptic female choice and the evolution of sperm form and function

Sperm competition and cryptic female choice profoundly affect sperm morphology, producing diversity within both species and individuals. One type of within‐individual sperm variation is sperm heteromorphism, in which each male produces two or more …