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Altricial

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Title: Altricial  
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Subject: Precocial, Superprecocial, Bohemian waxwing, Garden warbler, Yellowhammer
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Altricial

Altricial young birds.

Altricial, meaning "requiring nourishment", refers to a pattern of growth and development in organisms which are incapable of moving around on their own soon after hatching or being born. The word is derived from the Latin root alere meaning "to nurse, to rear, or to nourish" and refers to the need for young to be fed and taken care of for a long duration.[1] Species whose young are immediately or quickly mobile are known as precocial.

Contents

  • Scope 1
  • Basis 2
  • Terminology 3
  • See also 4
  • References 5
  • External links 6

Scope

In

  • The altricial-precocial spectrum in birds

External links

  1. ^ a b c Ehrlich, Paul (1988). The Birder's Handbook. New York: Simon & Schuster.  
  2. ^ Arterberry, Martha E. (2000). The Cradle of Knowledge. Development of Perception in Infancy. Cambridge: MIT Press. p. 27.  
  3. ^ Starck, J.M., Ricklefs, R.E. (1998). Avian Growth and Development. Evolution within the altricial precocial spectrum. New York:  
  4. ^ a b Starck, J. (1998). Avian Growth and Development. Oxford Oxfordshire: Oxford University Press.  
  5. ^ Eisenberg, John (1981). The Mammalian Radiations. London: Athlone Press.  

References

See also

The two strategies result in different brain sizes of the newborns compared to adults. Precocial animals' brains are large at birth relative to their body size, hence their ability to fend for themselves. However, as adults, their brains are not much bigger or more able. Altricial animals' brains are relatively small at birth, thus their need for care and protection, but their brains continue to grow. As adults, altricial animals end up with comparatively larger brains than their precocial counterparts. Thus the altricial species have a wider skill set at maturity.[1]

In birds, the terms Aves altrices and Aves precoces was introduced by Carl Jakob Sundevall (1836) and the terms nidifugous and nidicolous by Lorenz Oken in 1816. The two classifications were considered identical in early times, but the meanings are slightly different, in that "altricial" and "precocial" refer to developmental stage, while "nidifugous" and "nidicolous" refer to leaving or staying at the nest.[4]

Terminology

In the case of mammals it has been suggested that large adult body sizes favor production of large, precocious young, which develop with a long gestation period. Large young may be associated with long lifespan, extended reproductive period, and reduced litter size. It has been suggested that altricial strategies in mammals may be favoured if there is a selective advantage to mothers that are capable of resorbing embryos in early stages of development.[5] Some niches require young to be precocial for survival, such as cetaceans: restricted to water, and immobile, their helpless young would quickly drown.

Precocial birds are able to provide protein-rich eggs and thus their young hatch in the fledgling stage – able to protect themselves from predators (ducks or turkeys) and the females have less involvement post-natal. Altricial birds are less able to contribute nutrients in the pre-natal stage; their eggs are smaller and their young still in need of much attention and protection from predators. This may be related to r/K selection; however, this association fails with a number of cases.[4]

Different animals employ different precocial and altricial strategies; there is no clear distinction between the two states, and a wide range of intermediate states.[1] The ability of the parents to obtain nutrition and contribute to the pre-natal and post-natal development of their young appears to be associated.

Basis

At the opposite end of the spectrum are precocial animals in which the young have open eyes, have hair or down, have large brains, and are immediately mobile and somewhat able to flee from, or defend themselves against, predators. For example, with ground-nesting birds such as ducks or turkeys, the young are ready to leave the nest in one or two days. Among mammals, most ungulates are precocial, being able to walk almost immediately after birth. Beyond the precocial are the superprecocial animals, such as the megapode birds, which hatch with full flight feathers.[3]

[2]

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