Transitions Between Sexual Systems

Janet L. Leonard is a Research Associate with the Institute of Marine Sciences, University of California-Santa Cruz and a Fellow of the California Academy of Sciences. She received her Ph.D. at the University of Wisconsin-Madison, served as an Instructor at the University of Maine-Orono, and was a postdoctoral Fellow at the University of Calgary, Alberta, Canada and at the Scripps Institution of Oceanography of the University of California-San Diego; followed by faculty appointments at the University of Oklahoma and at the Mark O. Hatfield Marine Science Center of Oregon State University. She has been a Visiting Erskine Fellow at the University of Canterbury, New Zealand, and President of the Western Society of Malacologists. Her research interests are in animal behavior, sexual selection, and invertebrate biology.

1. The Evolution of Sexual Systems in Animals.- 2. The Evolution of Sexual Systems in Animals.- 3. Evolutionary Transitions Between Combined and Separate Sexes.- 4. The Evolution of Uniparental Reproduction in Rhabditina Nematodes: Phylogenetic patterns, Developmental Causes, and Surprising Consequences.- 5. Polychaete Worms on the Brink Between Hermaphroditism and Separate Sexes.- 6. Sex Determining Mechanisms in Bivalves.- 7. Transitions in Sexual and Reproductive Strategies Among the Caenogastropoda.- 8. Hermaphrodites, Dwarf Males, and Females: Evolutionary Transitions of Sexual Systems in Barnacles.- 9. Life History Constraints Facilitate the Evolution of Androdiocy and Male Dwarfing.- 10. Sexual Systems in Shrimps (infraorder Caridea Dana, 1852), with Special Reference to the Historical Origin and Adaptive Value of Protandric Simultaneous Hermaphroditism.- 11. Environmental and Genetic Sex Determining Mechanisms in Fishes.- 12. Causes and Consequences of Evolutionary Transitions in the Level of Phenotypic Plasticity of Reptilian Sex Determination.

"This volume will be of interest to all plant and animal biologists focused on sexual diversity. Understanding the evolutionary pressures acting on sexual systems is a fascinating topic, yet many unknowns remain. This book provides several up-to-date lines of arguments and testable hypotheses, which stimulates current curiosity and will help guide future research." (Lucas Marie-Orleach, The Quarterly Review of Biology, Vol. 95 (1), 2020)