Androdioecy

Androdioecy is a reproductive system characterized by the coexistence of males and hermaphrodites. Androdioecy is rare in comparison to the other major reproductive systems: dioecy, gynodioecy and hermaphroditism.[1] In animals, androdioecy has been considered an important stepping stone in the transition from dioecy to hermaphroditism, and vice versa.[2]

Evolution of androdioecy

The fitness requirements for androdioecy to arise and sustain itself are theoretically so improbable that it was long considered that such systems do not exist.[3][4] Particularly, males and hermaphrodites have to have the same fitness, in other words the same number of offspring, in order to be maintained. However, males only have offspring by fertilizing eggs or ovules of hermaphrodites, while hermaphrodites have offspring both through fertilizing eggs or ovules of other hermaphrodites and their own ovules. This means that all else being equal, males have to fertilize twice as many eggs or ovules as hermaphrodites to make up for the lack of female reproduction.[5][6]

Androdioecy can evolve either from dioecious ancestors through the invasion of hermaphrodites or from hermaphroditic ancestors through the invasion of males. The ancestral state is important because conditions under which androdioecy can evolve differ significantly.

Androdioecy with dioecious ancestry

In roundworms, clam shrimp, tadpole shrimp and cancrid shrimps, androdioecy has evolved from dioecy. In these systems, hermaphrodites can only fertilize their own eggs (self-fertilize) and do not mate with other hermaphrodites. Males are the only means of outcrossing. Hermaphrodites may be beneficial in colonizing new habitats, because a single hermaphrodite can generate many other individuals.[7] In the well-studied roundworm Caenorhabditis elegans, males are very rare and only occur in populations that are in bad condition or stressed.[8]

Androdioecy with hermaphroditic ancestry

In animals, corals (phyla Cnidaria) and barnacles (Subphyla Crustacea), androdioecy has evolved from hermaphroditism. Many plants self-fertilize, and males may be sustained in a population when inbreeding depression is severe because males guarantee outcrossing.

Androdioecious species

Despite their unlikely evolution, 115 androdioecious animal and about 50 androdioecious plant species are known.[2][9] These species include

Anthozoa (Corals)

Nematoda (Roundworms)

Rhabditidae (Order Rhabditida)

Diplogastridae (Order Rhabditida)

Steinernematidae (Order Rhabditida)

  • Steinernema hermaphroditum

Allanotnematidae (Order Rhabditida)

  • Allantonema mirabile
  • Bradynema rigidum

Dorylaimida

  • Dorylaimus liratus

Nemertea (Ribbon worms)
  • Prostoma eilhardi

Arthropoda

Clam shrimp

  • Eulimnadia texana[18]
  • Eulimnadia africana
  • Eulimnadia agassizii
  • Eulimnadia antlei
  • Eulimnadia braueriana
  • Eulimnadia brasiliensis
  • Eulimnadia colombiensis
  • Eulimnadia cylondrova
  • Eulimnadia dahli
  • Eulimnadia diversa
  • Eulimnadia feriensis
  • Eulimnadia follisimilis
  • Eulimnadia thompsoni
  • Eulimnadia sp. A
  • Eulimnadia sp. B
  • Eulimnadia sp. C

Tadpole shrimp

Barnacles

  • Paralepas klepalae
  • Paralepas xenophorae
  • Koleolepas avis
  • Koleolepas tinkeri
  • Ibla quadrivalvis
  • Ibla cumingii
  • Ibla idiotica
  • Ibla segmentata
  • Calantica studeri
  • Calantica siemensi
  • Calantica spinosa
  • Calantica villosa
  • Arcoscalpellum sp.
  • Euscalpellum squamuliferum
  • Scalpellum peronii
  • Scalpellum scalpellum
  • Scalpellum vulgare
  • Scillaelepas arnaudi
  • Scillaelepas bocquetae
  • Scillaelepas calyculacilla
  • Scillaelepas falcate
  • Scillaelepas fosteri
  • Smilium hastatum
  • Smilium peronii
  • Chelonibia patula[20]
  • Chelonibia testudinaria[21]
  • Bathylasma alearum[22]
  • Bathylasma corolliforme
  • Conopea galeata[23]
  • Conopea calceola[23]
  • Conopea merrilli[23]
  • Solidobalanus masignotus[24]
  • Tetrapachylasma trigonum
  • Megalasma striatum
  • Octolasmis warwickii[25]

Lysmata

Insects

Annelida (Ringed worms)
  • Salvatoria clavata
  • Ophryotrocha gracilis
  • Ophryotrocha hartmanni
  • Ophryotrocha diadema
  • Ophryotrocha bacci
  • Ophryotrocha maculata
  • Ophryotrocha socialis

Chordata

Plants
gollark: Cost and they're loud.
gollark: Mechanical ones use different generally clickier switches.
gollark: Membrane, I think.
gollark: It lacks function keys, unlike my laptop somehow.
gollark: My brother is very gamer and has a mechanical keyboard.

See also

References
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  2. Weeks, SC (2012). "The role of androdioecy and gynodioecy in mediating evolutionary transitions between dioecy and hermaphroditism in the Animalia". Evolution. 66 (12): 3670–3686. doi:10.1111/j.1558-5646.2012.01714.x. PMID 23206127.
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  4. Darwin C. 1877. The different forms of flowers and plants of the same species. New York: Appleton.
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  25. Yusa, Y; Takemura, M; Miyazaki, K; Watanabe, T; Yamato, S (2010). "Dwarf Males of Octolasmis warwickii (Cirripedia: Thoracica): The First Example of Coexistence of Males and Hermaphrodites in the Suborder Lepadomorpha". The Biological Bulletin. 218 (3): 259–265. doi:10.1086/bblv218n3p259. PMID 20570849.
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