Evolutionary Perspectives on Hermaphroditism in Fishes

Evolutionary perspectives on hermaphroditism in fishes.

Hermaphroditism is a derived and polyphyletic condition in fishes, documented in about 2% of all extant teleost species scattered across more than 20 taxonomic families in 9 orders. It shows a variety of expressions that can be categorized into sequential and synchronous modes. Among the sequential hermaphrodites are protogynous species in which an individual begins reproductive life as a femal...

Phylogenetic perspectives on the evolution of functional hermaphroditism in teleost fishes.

Hermaphroditism is taxonomically widespread among teleost fishes and takes on many forms including simultaneous, protogynous, and protandrous hermaphroditism, bidirectional sex change, and androdioecy. The proximate mechanisms that influence the timing, incidence, and forms of hermaphroditism in fishes are supported by numerous theoretical and empirical studies on their mating systems and sexua...

Evolutionary perspectives on schizophrenia.

The theory of evolution may be relevant to psychiatric disorders. Evolution reflects changes in genes throughout time. Thus, evolutionary forces can shape any phenotype that is genetically rooted and that possesses a long history. Schizophrenia is likely an ancient condition with a substantial genetic component. Since the 1960s, several researchers have applied evolutionary principles to the st...

Hermaphroditism

Genetic, abiotic and social influences on sex differentiation in cichlid fishes and the evolution of sequential hermaphroditism

References 107 Abstract Genetic and environmental factors may interact to control sex determination in fishes. A common pattern of initial female differentiation and subsequentmale transformation before maturation in non-hermaphroditic fishes and after maturation in sequentially hermaphroditic fishes has suggested that changes in developmental timing may be responsible for the evolution of vari...