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Related to protandrous: protogynous


1. Of or relating to an organism, especially a plant, in which the male reproductive organs mature before the female reproductive organs.
2. Of or relating to the earlier arrival of males than of females at a breeding site: protandrous migration.

pro·tan′dry (-drē) n.


(prəʊˈtændrəs) or


1. (Botany) (of hermaphrodite or monoecious plants) maturing the anthers before the stigma
2. (Zoology) (of hermaphrodite animals) producing male gametes before female gametes. Compare protogynous
proˈtandry n
References in periodicals archive ?
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 mode of reproduction for whelks also needs investigation because Castagna and Kraeuter (1994) suggested that knobbed whelk may be protandrous hermaphrodites.
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.
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.
are protandrous, have both male and female flowers open at the same