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Sexual conflict occurs when the costs and benefits of mating differ between males and females. Numerous studies have confirmed that compounds in the seminal fluids of males can impact females. These impacts include manipulation of egg laying, reductions in innate immune responses, and altering behavior. Prostaglandin E2 (PGE2) is a compound found in the spermatophore of house crickets and initiates oviposition behavior in female crickets. Here, I speculate that PGE2 may affect mate-search behavior in house crickets in a dose-dependent manner. Past studies have indicated PGE2 also simulate multiple mating by giving female house crickets multiple injections of PGE2. This experiment investigated the phonotactic (latency to reach an acoustic stimulus) response of females when injected with PGE2. The female crickets were raised until adult eclosion and the phonotactic cues were measured 24 h after injection with a 1 μg, 10 μg, 100 μg dose of PGE2 dissolved in 1 μL EtOH and 9 μL of phosphate buffer saline (PBS). Controls were injected with 1 μL EtOH and 9 μL pf PBS only. Crickets were randomly assigned (n=10) to each group prior. Acoustic stimuli were applied afterwards. The latency to respond to male signals was not impacted by PGE2; thus, PGE2 does not impact other aspects of female behavior or life-history that can be manipulated by other components of male seminal fluids. Introduction and conceptual background Mate selection can create an asymmetry in evolutionary interests, since two persons rarely have exactly the same allelic and genomic composition (reviewed in Arnqivist and Rowe, 2005). These differences are similar to parental and child interest asymmetry (Trivers 1972). Thus, the strategy and behavior of matt selection will differ between women and men depending on the amount of investment that individual devotees towards future children (Parker, 1979). This asymmetry can generate a more expensive and larger sex cell (gametes) before conception, while males tend to produce a less expensive and smaller sex cell (sperm) (Bateman 1948). Therefore, a conflict for the pursuit of individual, evolutionary interests can arise through reproductive strategies and sexual selection that can lead to gender divergence (Parker, 1979). The theory of sexual conflict explains how differences in the interests of men and women generate coevolution between men and women (reviewed in Chapman et al., 2003). Genetically speaking, sexual conflict can also be investigated. The difference in morphology, physiology and behavior is based on the genetic differences between the sexes. Genetic sexual conflict may be both intralocal and interlocutory (Parker and Partridge, 1998). That is, according to the sex, there are different selective pressures at the same location. The other genetic instance of sexual conflict is the sexual conflict. This happens when two alleles interact with one sex and have a negative effect on the other sex (reviewed in Arnqvist and Rowe, 2005). Interlocus sexual conflict results in a " arms race " scenario in which sexual antagonism can be observed. (Price and Burley, 1994). The other instance of sexual conflict at the genetic level is interlocus sexual conflict. This occurs when, at two loci, two alleles interact resulting in a trait in one sex that has a negative impact on the other sex (reviewed in Arnqvist and Rowe, 2005). Interlocus sexual conflict results in an “arms race” scenario where antagonistic co-evolution of the sexes can be observed. Sexual conflict can occur in many forms, including pre-copulatory behavior and mating-related phenotypes, parental care, fertilization tactics and even post-mating (Parker and Partridge, 1998). The most convincing examples of sexual

Should I or Should I Not? The Effects of Prostaglandin E2 on Mate-Search behavior, in Female Crickets, Acheta Domesticus