Jump to content
Ornithology Exchange (brought to you by the Ornithological Council)

Seasonal Spermatogenesis in the Mute Swan (Cygnus olor)

Chris Merkord
  • Breucker, H. Springer-Verlag Berlin Heidelberg 1982 Berlin Germany http://www.springer.com/us/book/9783540113263 English , Ducks, Geese and Swans (Anatidae), Advances in Anatomy, Embryology and Cell Biology No value 03/31/1982 3540113266 9783540113263 12/06/2012 9783642684609

Of all the classes in the animal kingdom, birds represent the best known. There are in total about 8600 living species, and the systematic study of this class is more or less complete. Extensive observations - to a large extent by amateur ornithologists - with respect to geographical distribution, life cycles, demands on and adaptations to the environment, breeding habits, migration, and so forth have contributed towards basic and more widely relevant knowledge, e. g. , in the areas of ethology, ecology, and evo­ lution and also in social biology (Hilprecht 1970; Farner and King 1971). Together, all these aspects are affected by the reproductive biology of birds, and studies have therefore been carried out for many years with special emphasis on this subject. How­ ever, until now this emphasis in avian reproductive biology has been physiological and in particular endocrinological (Murton and Westwood 1977; Roosen-Runge 1977). The morphology of the gonads has been treated in far less detail, and has been confined to a comparatively small number of species, compared with other classes of vertebrates. Reproduction is the section in the life cycle of an animal which is most dependent upon environmental conditions. Reproduction therefore usually takes place at a par­ ticular time, when stress for the adult animals is at its lowest and the chances of sur­ vival for the newborn are at their highest, i. e.

User Feedback

Recommended Comments

There are no comments to display.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Add a comment...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...