Abstract. To determine the generality of avian diversity patterns, we investigated patterns of elevational zonation shown by birds and mammals along the eastern slope of the Andes Mountains in southeastern Peru. The strong environmental gradient sampled, entirely within Peru's Manu National Park and Biosphere Reserve, supports highly diverse faunas. Elevational distributions of 901 bird species, 129 bat species, and twenty‐eight species of native mice exhibit contrasting patterns in species richness, species composition, and species turnover. Birds and bats showed smooth declines of species richness with elevation, whereas the richness of mouse assemblages was unrelated to elevation. For all three groups, the greatest differences were between lowland and highland faunas, although cutoff points for this contrast varied among groups (≈ 500 m for birds, 750 m for bats, and 1000 m for mice). Differences in composition also separated bird and bat faunas on either side of c. 1400 m (the boundary between montance forest and cloud forest); for mice, this faunal transition may take place nearer to 2000 m. Bird and bat faunas lacked the more discrete zonations suggested for mouse assemblages, as indicated by elevational range profiles and nested subset analyses. Distinct highland assemblages are apparent in two‐dimensional histograms of range limits of birds and mice, but not for bats. Highland bat species occupy broader elevational ranges than lowland bat species, but for both birds and mice, species at intermediate elevations had the broadest amplitudes. Finally, clumping of range maxima and minima along the gradient identified zones of pronounced species turnover in each group, but these were generally not strongly associated with the locations of ecotones. Differences in zonation of these groups appear to reflect their different biological attributes and phylogenetic histories. Such differences obviously complicate discussions of ‘general’ diversity patterns, and limit the usefulness of birds to forecast or predict diversity patterns in other more poorly known groups—other groups may show elevated diversity and endemism in areas where avian diversity patterns appear unremarkable. The pronounced contrasts between bats and mice, and the generally intermediate character of avian patterns, suggest that future analyses might profitably partition birds into finer, more homogeneous groups of historically and/or ecologically similar species. Group differences in zonation may ultimately prove explicable with information on both species‐abundance patterns and resource distributions.

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. American Ornithologists' Union is collaborating with JSTOR to digitize, preserve and extend access to The Auk. Changes in this supplement include the following: (1) one genus (Chrysomus) and eight species (Oceanodroma monorhis, Ixobrychus minutus, Ardea purpurea, Platalea leucorodia, Glareola pratincola, Elaenia albiceps, Luscinia sibilans, and Chrysomus icterocephalus) are added to the main list (including three species transferred from the Appendix) on the basis of new distributional information; (2) the distributional statement of one species (Trogon melanurus) is changed because of a split from an extralimital species; (3) three species are changed (to Melanitta americana, Trogon caligatus, and T. chionurus) by being split from extralimital species; (4) six species (Caprimulgus arizonae, Chasiempis sclateri, C. ibidis, Icterus northropi, I. melanopsis, and I. portoricensis) are added as a result of splits from species already on the list; (5) two species (Troglodytes hiemalis and T. pacificus) are added by being split both from an extralimital taxon (T. troglodytes) and from each other; (6) five species (Melozone fusca, M. albicollis, M. crissalis, M. aberti, and Amphispiza quinquestriata) are transferred to currently recognized genera; (7) five genera (Psilorhinus, Peucaea, Oreothlypis, Parkesia, and Rhynchophanes) are added because of splits from other genera, resulting in changes to 20 scientific names; (8) a new scientific name (Vermivora cyanoptera) is adopted for one species because of a nomenclatural problem with the previous scientific name (V. pinus); (9) the citation for one species (Dendroica pinus) is changed; (10) the endings of the specific or subspecific names of two taxa (Acanthidops bairdi and Vireo gilvus swainsoni) are corrected; (11) the English names of three species (Caprimulgus vociferus, Chasiempis sandwichensis, and Icterus dominicensis) are modified as a result of taxonomic changes, the English name of one species (Puffinus gravis) is modified for global conformity, and the hyphen is removed from the English name of one species (Empidonomus aurantioatrocristatus); and (12) two species (Empidonomus aurantioatrocristatus and Thryothorus sinaloa) are added to the list of species known to occur in the United States.Numerous changes are made at higher levels of the classification on the basis of new genetic data. Four newly recognized orders (Phaethontiformes, Suliformes, Accipitriformes, and Eurypygiformes) are added to the main list by being split from existing 29_Supplement_127-3.indd 726 7/2/10 12:41:48 PM

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