Ovary 



(1) The portion of the Pistil or Carpel of a flower that 

 contains one or more ovules (q. v.). (2) The organ in female 

 animals that produces the egg or ovum. 



Overdispersion 



See Contagious dispersion. 



Overgrazing 



Grazing so intensively that it reduces the capacity of 

 plants to continue production of forage and also causes de- 

 terioration by damaging plants or soil or both. cf. Under- 

 grazing. 



Overpopulation 



A population-density in excess of the capacity of the en- 

 vironmental resources to supply the requirements of the in- 

 dividual organisms, usually accompanied by a high mortality 

 rate because of inadequate nutrition, insufficient shelter, and 

 increased predation, disease, or parasitism, cf. Malthusian. 



Overstocked 



(1) Refers to stands of trees in which the large number 

 may retard growth. (2) A population of animals in which the 

 number is in excess of the resources of the habitat to provide 

 food and shelter, cf. Fully stocked. 



Overstocking 



The placing of more livestock on a range than its re- 

 sources can support through the grazing season without 

 Overgrazing. 



Overstory 



The layer of trees in a forest that forms the Canopy, cf. 

 Understory. 



Overturn 



The spring and fall circulation in lakes induced by the 



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