Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

On the Evolution of Sexually Transmitted Diseases in Birds

Michael P. Lombardo
Journal of Avian Biology
Vol. 29, No. 3 (Sep., 1998), pp. 314-321
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3677114
Stable URL: http://www.jstor.org/stable/3677114
Page Count: 8
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
On the Evolution of Sexually Transmitted Diseases in Birds
Preview not available

Abstract

Sexually transmitted diseases (STDs) in animals are caused by pathogens that are transmitted during copulation. Birds have played an important role in the development of STD-centered theories of mating behavior. However, it is not known whether STDs exist in wild bird populations. While the avian cloaca with its dual functions of gamete transfer and excretion seemingly predisposes birds for the evolution of STDs, the life history patterns of most birds (i.e., seasonal breeders with relatively brief annual periods of sexual activity) suggest otherwise. The importance of STDs as selective forces that shape host biology depends on whether host life history patterns provide the necessary conditions for the evolution and spread of virulent pathogens that rely on host copulation for dispersal. Infrequent dispersal opportunities for microbes that rely on host sexual contact for dispersal should favor the evolution of low pathogen virulence, persistent infection, and lengthened infectious periods. I examine the disease characteristics of documented STDs that are relevant to birds in order to evaluate the (1) importance of STDs as selective forces in birds and (2) ecological conditions in which avian STDs are likely to be discovered. I conclude that socially monogamous short-lived birds with short breeding cycles and altricial nestlings (e.g., temperate zone songbirds) are not likely to have coevolved with highly virulent STDs which would be important selective forces. However, virulent STDs may have evolved in birds with one or more of the following life history characteristics: long life spans, long breeding cycles, multiple matings, and precocial young because these conditions produce increased opportunities for pathogen transmission and can favor the evolution of virulence. These life history characteristics are found and exaggerated in the birds for which STDs have been documented, the domesticated fowl and waterfowl.

Page Thumbnails

  • Thumbnail: Page 
314
    314
  • Thumbnail: Page 
315
    315
  • Thumbnail: Page 
316
    316
  • Thumbnail: Page 
317
    317
  • Thumbnail: Page 
318
    318
  • Thumbnail: Page 
319
    319
  • Thumbnail: Page 
320
    320
  • Thumbnail: Page 
321
    321