title: Elevational patterns of species richness, range and body size for spiny frogs.
abstract: Quantifying spatial patterns of species richness is a core problem in biodiversity theory. Spiny frogs of the subfamily Painae (Anura: Dicroglossidae) are widespread, but endemic to Asia. Using spiny frog distribution and body size data, and a digital elevation model data set we explored altitudinal patterns of spiny frog richness and quantified the effect of area on the richness pattern over a large altitudinal gradient from 0-5000 m a.s.l. We also tested two hypotheses: (i) the Rapoport's altitudinal effect is valid for the Painae, and (ii) Bergmann's clines are present in spiny frogs. The species richness of Painae across four different altitudinal band widths (100 m, 200 m, 300 m and 400 m) all showed hump-shaped patterns along altitudinal gradient. The altitudinal changes in species richness of the Paini and Quasipaini tribes further confirmed this finding, while the peak of Quasipaini species richness occurred at lower elevations than the maxima of Paini. The area did not explain a significant amount of variation in total, nor Paini species richness, but it did explain variation in Quasipaini. Five distinct groups across altitudinal gradient were found. Species altitudinal ranges did not expand with an increase in the midpoints of altitudinal ranges. A significant negative correlation between body size and elevation was exhibited. Our findings demonstrate that Rapoport's altitudinal rule is not a compulsory attribute of spiny frogs and also suggest that Bergmann's rule is not generally applicable to amphibians. The study highlights a need to explore the underlying mechanisms of species richness patterns, particularly for amphibians in macroecology.
authors: Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan, China.
authors: Junhua
authors: J
authors: Hu
authors: Feng
authors: F
authors: Xie
authors: Cheng
authors: C
authors: Li
authors: Jianping
authors: J
authors: Jiang
references: Evolution. 1966 Dec;20(4):456-465
references: 28562908
references: Oecologia. 2010 Oct;164(2):555-65
references: 20677016
references: Proc Natl Acad Sci U S A. 2010 Aug 3;107(31):13765-70
references: 20643945
references: Nature. 2004 Jan 8;427(6970):145-8
references: 14712274
references: Science. 1992 Mar 27;255(5052):1663-70
references: 17749419
references: Am Nat. 2003 Apr;161(4):553-66
references: 12776884
references: Am Nat. 2003 May;161(5):821-5
references: 12858287
references: Zoolog Sci. 2005 Mar;22(3):353-62
references: 15795498
references: Am Nat. 1992 Dec;140(6):893-911
references: 19426029
references: Evolution. 2008 Feb;62(2):413-20
references: 17999723
references: Am Nat. 2000 Oct;156(4):390-415
references: 29592141
references: Evolution. 1997 Apr;51(2):630-632
references: 28565350
references: Ecology. 2007 Jan;88(1):76-86
references: 17489456
references: Evolution. 2003 May;57(5):1151-63
references: 12836831
references: Am Nat. 1997 May;149(5):875-902
references: 18811253
references: Sci China C Life Sci. 2007 Apr;50(2):265-76
references: 17447035
references: Proc Biol Sci. 2007 Apr 7;274(1612):919-28
references: 17284409
references: Mol Phylogenet Evol. 2009 Jan;50(1):59-73
references: 18992827
references: Nature. 2000 Feb 24;403(6772):853-8
references: 10706275