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Androdioecy

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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 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, tadpole 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 plants, corals and barnacles, 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)

Allanotnematidae (Order Rhabditida)

Dorylaimida

Nemertea (Ribbon worms)

Arthropoda

Clam shrimp

Tadpole shrimp

Barnacles

Lysmata

Insects

Annelida (Ringed worms)

Chordata

Plants

  • Ishida, Kiyoshi; Hiura, Tsutom (1998). "Pollen Fertility and Flowering Phenology in an Androdioecious Tree, Fraxinus lanuginosa (Oleaceae), in Hokkaido, Japan". International Journal of Plant Sciences. 159: 941–947. doi:10.1086/314088.
  • Pennisi, Elizabeth. "'Sex and the Single Killifish'" (PDF). Science. 313: 2006. doi:10.1126/science.313.5792.1381.
  • Diana Wolf. 'Breeding systems: Evolution of androdioecy'

See also

References

  1. ^ Pannell, JR. (2002). "The evolution and maintenance of androdioecy". Annual Review of Ecology and Systematics. 33: 397–425. doi:10.1146/annurev.ecolsys.33.010802.150419.
  2. ^ a b 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.
  3. ^ Charlesworth, D (1984). "Androdioecy and the evolution of dioecy". Biological Journal of the Linnean Society. 22 (4): 333–348. doi:10.1111/j.1095-8312.1984.tb01683.x.
  4. ^ Darwin C. 1877. The different forms of flowers and plants of the same species. New York: Appleton.
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  8. ^ a b Stewart, AD; Phillips, PC (2002). "Selection and maintenance of androdioecy in Caenorhabditis elegans". Genetics. 160 (3): 975–982.
  9. ^ Weeks, SC; Benvenuto, C; Reed, SK (2006). "When males and hermaphrodites coexist: a review of androdioecy in animals". Integrative and Comparative Biology. 46 (4): 449–464. doi:10.1093/icb/icj048.
  10. ^ Fürst von Lieven A (2008). "Koerneria sudhausi n. sp. (Nematoda: Diplogastridae); a hermaphroditic diplogastrid with an egg shell formed by zygote and uterine components". Nematology. 10 (1): 27–45. doi:10.1163/156854108783360087.
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  17. ^ a b Hermmann M, Ragsdale EJ, Kanzaki N, Sommer RJ (2013). "Sudhausia aristotokia n. gen., n. sp. and S. crassa n. gen., n. sp. (Nematoda: Diplogastridae): viviparous new species with precocious gonad development". Nematology. 15: 1001–1020.
  18. ^ Vicky G. Hollenbeck; Stephen C. Weeks; William R. Gould; Naida Zucker (2002). "Maintenance of androdioecy in the freshwater shrimp Eulimnadia texana: sexual encounter rates and outcrossing success". Behavioral Ecology. 13 (4): 561–570. doi:10.1093/beheco/13.4.561.
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  21. ^ Zardus, JD; Hadfield, MG (2004). "Larval Development and Complemental Males in Chelonibia testudinaria, a Barnacle Commensal with Sea Turtles". Journal of Crustacean Biology. 24 (3): 409–421. doi:10.1651/c-2476.
  22. ^ Foster, BA (1983). "Complemental males in the barnacle Bathylasma alearum (cirripedia, pachylasmatidae)". Mem. Aus. Mus. 18: 133–140. doi:10.3853/j.0067-1967.18.1984.379.
  23. ^ a b c McLaughlin, PA; Henry, DP (1972). "Comparative Morphology of Complemental Males in Four Species of Balanus (Cirripedia Thoracica)". Crustaceana. 22 (1): 13–30. doi:10.1163/156854072x00642.
  24. ^ Henry, DP; McLaughlin, PA (1967). "A Revision of the Subgenus Solidobalanus Hoek (Cirripedia Thoracica) including a Description of a New Species with Complemental Males". Crustaceana. 12 (1): 43–58. doi:10.1163/156854067x00693.
  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.
  26. ^ Mackiewicz; Tatarenkov, A; Taylor, DS; Turner, BJ; Avise, JC; et al. (2006). "Extensive outcrossing and androdioecy in a vertebrate species that otherwise reproduces as a self-fertilizing hermaphrodite". Proc Natl Acad Sci USA. 103 (26): 9924–9928. doi:10.1073/pnas.0603847103. PMC 1502555. PMID 16785430.
  27. ^ Gleiser G, Verdú M. 2005. Repeated evolution of dioecy from androdioecy in Acer" New Phytologist 165(2):633-640. doi=10.1111/j.1469-8137.2004.01242.x
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  29. ^ Pannell J (1997). "Widespread functional androdioecy in Mercurialis annua L. (Euphorbiaceae)". Biological Journal of the Linnean Society. 61: 95–116. doi:10.1111/j.1095-8312.1997.tb01779.x.
  30. ^ Valiente-Banuet, A; Rojas-Martínez, A; Del Coro, Arizmendi M; Dávila, P (1997). "Pollination biology of two columnar Cacti (Neobuxbaumia mezcalaensis and Neobuxbaumia macrocephala) in the Tehuacan Valley, central Mexico". American Journal of Botany. 84 (4): 452. doi:10.2307/2446020.
  31. ^ Thomson JD,Shivanna KR, Kenrick J and Knox RB. 1989" American Journal of Botany 76 (7):1048-1059
  32. ^ Muenchow, G (1998). "Subandrodioecy and male fitness in Sagittaria lancifolia subsp. lancifolia (Alismataceae)". American Journal of Botany. 85 (4): 513. doi:10.2307/2446435.
  33. ^ López-Almansa, JC; Pannell, JR; Gil, L (2003). "Female sterility in Ulmus minor (Ulmaceae): a hypothesis invoking the cost of sex in a clonal plant". American Journal of Botany. 90 (4): 603–609. doi:10.3732/ajb.90.4.603.
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