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.

A Unified Model of Avian Species Richness on Islands and Continents

Attila Kalmar and David J. Currie
Ecology
Vol. 88, No. 5 (May, 2007), pp. 1309-1321
Published by: Wiley
Stable URL: http://www.jstor.org/stable/27651229
Page Count: 13
  • Download ($42.00)
  • Subscribe ($19.50)
  • Cite this Item
A Unified Model of Avian Species Richness on Islands and Continents
Preview not available

Abstract

How many species in a given taxon should be found in a delimited area in a specified place in the world? Some recent literature suggests that the answer to this question depends strongly on the geographical, evolutionary, and ecological context. For example, current theory suggests that species accumulate as a function of area differently on continents and islands. Species richness—climate relationships have been examined separately on continents and on islands. This study tests the hypotheses that (1) the functional relationship between richness and climate is the same on continents and islands; (2) the species—area slope depends on distance-based isolation; (3) species—area relationships differ among land bridge islands, oceanic islands, and continents; (4) richness differs among biogeographic regions independently of climate and isolation. We related bird species numbers in a worldwide sample of 240 continental parcels and 346 islands to several environmental variables. We found that breeding bird richness varies similarly on islands and on continents as a function of mean annual temperature, an area × precipitation interaction, and the distance separating insular samples from the nearest continent (R2 = 0.86). Most studies to date have postulated that the slope of the species—area relationship depends upon isolation. In contrast, we found no such interaction. A richness—environment relationship derived using Old World sites accurately predicts patterns of richness in the New World and vice versa (R2 = 0.85). Our results suggest that most of the global variation in richness is not strongly context-specific; rather, it reflects a small number of general environmental constraints operating on both continents and islands.

Page Thumbnails

  • Thumbnail: Page 
1309
    1309
  • Thumbnail: Page 
1310
    1310
  • Thumbnail: Page 
1311
    1311
  • Thumbnail: Page 
1312
    1312
  • Thumbnail: Page 
1313
    1313
  • Thumbnail: Page 
1314
    1314
  • Thumbnail: Page 
1315
    1315
  • Thumbnail: Page 
1316
    1316
  • Thumbnail: Page 
1317
    1317
  • Thumbnail: Page 
1318
    1318
  • Thumbnail: Page 
1319
    1319
  • Thumbnail: Page 
1320
    1320
  • Thumbnail: Page 
1321
    1321