In 1969 he proposed the size-advantage model to explain sequential hermaphroditism.

Many studies have focused on the proximate causes of sequential hermaphroditism.

Common model organisms for this type of sequential hermaphroditism are wrasses.

Thus, he suggests that female fecundity has more impact on sequential hermaphroditism than the age structures of the population.

This phenomenon is called sequential hermaphroditism.

Some species exhibit sequential hermaphroditism.

Some specimens, particularly larger ones, have both male and female gametes and a study concluded that this was consistent with sequential hermaphroditism.

Their analysis supports the size-advantage model by Ghiselin and suggest that sequential hermaphroditism is correlated to the size-advantage.

The "low-density model" states that individuals have characteristics that reduce the opportunity for mating; this model cannot be applied to sequential hermaphroditism.

Under what conditions are sequential hermaphroditism, simultaneous hermaphroditism or dioecy evolutionary stable (ES)?

Sequential hermaphroditism (called dichogamy in botany) is a type of hermaphroditism that occurs in many fish, gastropods and plants.

Sequential hermaphroditism is common in fish (particularly teleost fish) and some jellyfish, many gastropods (such as the common slipper shell), and some flowering plants.

Females turn into males when they reach a length of approximately 20 cm, thus the size advantage model for sequential hermaphroditism applies in the case of the honeycomb grouper.