There is also some conjecture that this species (and perhaps genus) occasionally deviates from the protandrous
life history; oogonia and spermatogonia appear to compete for the starting role in newly matured oysters, with some evidence that females occasionally develop first (Coe 1931b, Coe 1932).
The flowers of this genus are protandrous
and produce nectar (N.
The mode of reproduction for whelks also needs investigation because Castagna and Kraeuter (1994) suggested that knobbed whelk may be protandrous
Proximate control and adaptive potential of protandrous
migration in birds.
Effects of plant size, plant density and sex differential nectar reward on pollinator visitation in the protandrous
Echium vulgare (Boraginaceae).
Photinus carolinus is protandrous
, with the first males appearing on May 24 on average, approximately half-peak male abundances reached by Jun 5, first females by Jun 9, with the final night of peak male activity being Jun 11 (Faust & Weston, 2009).
The eastern oyster is a protandrous
species, beginning life as a male and changing its sex to female as the oyster ages (Galtsoff 1964).
Both conditions are frequent in tropical American palms, such as in Bactridinae, with Aiphanes being protandrous
(Listabarth, 1992b), while Acrocomia, Astrocaryum, Bactris and Desmoncus are protogynous (Scariot & Lleras, 1991; Listabarth, 1992b; Henderson et al.
This species has a strongly protandrous
mating system with frequent male-male competition for access to females (Lundgren 1977), so it is reasonable that male larvae would interact with ants to optimize adult size as long as the costs to development time were not too great.
Although this species is a protandrous
hermaphrodite in certain regions, e.
Oysters are protandrous
, sequential hermaphrodites, initially spawning as males and transitioning to functional females at ~30 mm left valve length (LVL) (Galtsoff 1930, Thompson et al.
, have both male and female flowers open at the same