World Library  
Flag as Inappropriate
Email this Article

Oophagy

Article Id: WHEBN0006257637
Reproduction Date:

Title: Oophagy  
Author: World Heritage Encyclopedia
Language: English
Subject: List of feeding behaviours, Pelagic thresher, Slender smooth-hound, Cannibalism (zoology), Bigeye thresher
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Oophagy

Oophagy ( ) sometimes ovophagy, literally "egg eating", is the practice of embryos feeding on eggs produced by the ovary while still inside the mother's uterus. The word oophagy is formed from the classical Greek ᾠόν (ōion, egg) and classical Greek φᾱγεῖν (phāgein, to eat). In contrast, adelphophagy is the cannibalism of a multi-celled embryo.

Oophagy is thought to occur in all sharks in the order Lamniformes and has been recorded in the bigeye thresher (Alopias superciliosus), the pelagic thresher (A. pelagicus), the shortfin mako (Isurus oxyrinchus) and the porbeagle (Lamna nasus) among others.[1] It also occurs in the tawny nurse shark (Nebrius ferrugineus), and in the family Pseudotriakidae.

This practice may lead to larger embryos or prepare it for a predatory lifestyle.[2]

There are variations in the extent of oophagy among the different shark species. The grey nurse shark (Carcharias taurus) practices intrauterine cannibalism, the first developed embryo consuming both additional eggs and any other developing embryos. Slender smooth-hounds (Gollum attenuatus), form egg capsules which contain 30-80 ova within which only one ovum develops while all other ova are ingested and packed to an external yolk sac. The embryo then develops normally without ingesting further eggs.[1]

Oophagy is also used to refer to more general egg-eating behaviours such as those practised by some snakes. Similarly, the term can be used to describe the destruction of non-queen eggs in nests of certain social wasps such as seen in Polistes biglumis and Polistes humilis.[3] Oophagy has been observed in Leptothorax acervorum and Parachartergus fraternus, where oophagy is practiced to increase energy circulation and consume more protein.[4][5] Polistes fuscatus use oophagy as a method to establish a dominance hierarchy; dominant females will eat the eggs of subordinate females such that they no longer produce eggs, possibly due to the unnecessary expending of energy and resources.[6]

See also

Notes

  1. ^ a b
  2. ^ Wourms, J. P. (1981) Viviparity: The maternal-fetal relationship in fishes. Am. Zool. 21:473-515.
  3. ^
  4. ^ Mateus, Sidnei, Fernando Barbosa Noll, and Ronaldo Zucchi. "Caste Flexibility and Variation According to the Colony Cycle in the Swarm-founding Wasp, Parachartergus Fraternus (Gribodo) (Hymenoptera: Vespidae: Epiponini)." Journal of the Kansas Entomological Society 77.4 (2004): 470-83. Web. 11 Oct. 2014.
  5. ^
  6. ^ West-Eberhard, M. J. 1969 The social biology of polistine wasps. Mis . Publ.Zool. Univ. Michigan 140, 1-101
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.