| Abstract: | Estimates of annual survival rates of neotropical birds have proven controversial. Traditionally, tropical birds were thought to have high survival rates for their size, but analyses of a multispecies assemblage from Panama by Karr et al. (1990) provided a counterexample to that view. One criticism of that study has been that the estimates were biased by transient birds captured only once as they passed through the area being sampled. New models that formally adjust for transient individuals have been developed since 1990. Preliminary analyses indicate that these models are indeed useful in modelling the data from Panama. Nonetheless, there is considerable interspecific variation and overall estimates of annual survival rates for understorey birds in Panama remain lower than those from other studies in the Neotropics and well below the rates long assumed for tropical birds (i.e. > 0.80). Therefore, tropical birds may not have systematically higher survival rates than temperate-zone species. Variation in survival rates among tropical species suggests that theory based on a simple tradeoff between clutch size and longevity is inadequate. The demographic traits of birds in the tropics (and elsewhere) vary within and among species according to some combination of historical and ongoing ecological factors. Understanding these processes is the challenge for future work. |
| Genre: | Book chapter |
| ProdID: | 5211019 |
| Citation Author: | Brawn, J.D.; Karr, J.R.; Nichols, J.D.; Robinson, W.D. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation Editor: | Adams, N.J.; Slotow, R.H. (editors) |
| Citation End Page: | 305 |
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| Citation Language: | English |
| Citation Larger Work Title: | Proceedings 22nd International Ornithological Congress, 16-22 August 1998, Durban. |
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| Citation Phsyical Description: | on CD-ROM: lxxxi, 3229 |
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| Citation Public Comments: | Title on liner notes: Making rain for African ornithology. Within contents, click on S06. Demography of tropical forest birds. Convenors: Francis, C.M. & Piper, S. Other sections of this IOC are published in Ostrich v. 69 #3-4 and v. 70 #1. |
| Citation Publisher: | Bird Life South Africa |
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| Citation Search Results Text: | Demography of forest birds in Panama: How do transients affect estimates of survival rates?; 1999; Book chapter; Proceedings 22nd International Ornithological Congress, 16-22 August 1998, Durban.; Brawn, J.D.; Karr, J.R.; Nichols, J.D.; Robinson, W.D. |
| Citation Start Page: | 297 |
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| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Demography of forest birds in Panama: How do transients affect estimates of survival rates?; 1999; Book chapter; Proceedings 22nd International Ornithological Congress, 16-22 August 1998, Durban.; Brawn, J.D.; Karr, J.R.; Nichols, J.D.; Robinson, W.D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 9 Jun 2009 09:23 -0500 |
| Publisher: | Bird Life South Africa |
