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Göteborgs universitets publikationer

Stable isotopes and mtDNA reveal niche segregation but no evidence of intergradation along a habitat gradient in the Lesser Whitethroat complex (Sylvia curruca; Passeriformes; Aves) ESZEN LL, 1983, OECOLOGIA, V57, P32

Författare och institution:
S. C. Votier (-); S. Aspinall (-); S. Bearhop (-); D. Bilton (-); J. Newton (-); P. Alstrom (-); P. Leader (-); G. Carey (-); R. W. Furnes (-); Urban Olsson (Institutionen för biologi och miljövetenskap)
Publicerad i:
Journal of Ornithology, 157 ( 4 ) s. 1017-1027
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
Niche segregation plays a critical role in the speciation process, but determining the extent to which taxa are geographically or ecologically isolated is challenging. In this study, we use stable isotopes of carbon (delta C-13), nitrogen (delta N-15), hydrogen (delta H-2) and oxygen (delta O-18) to test for ecological differences among taxa in the Lesser Whitethroat Sylvia curruca complex. Analysis of mitochondrial DNA (mtDNA) revealed 6 distinct haplotype groups, which conform to at least 5 distinct taxa. Stable isotopes provided insight into geographical and broad-scale ecological differences among haplotypes. The most striking isotope differences were between the populations inhabiting Siberian boreal forest (S. c. blythi) from the one inhabiting semi-desert in Kazakhstan (S. c. halimodendri). It is generally assumed that these two populations form a morphological cline along a gradient from mesic to xeric habitat. Our sample includes a large proportion of morphologically intermediate individuals that appear to represent a hybrid population. However, in all of these, there is strict correspondence between haplotype and isotope signature, suggesting an ecological division on the breeding grounds between all our samples of these two taxa. The lack of ecologically intermediate individuals among our sample of morphologically intermediate ones thus speaks against the existence of a cline. The two taxa blythi and halimodendri emerge as potential models for the study of the early stages of the speciation process. While differences in stable isotopes may be largely influenced by geography, we also demonstrate how, in specific instances (such as the alleged cline reported here), they may be used to evaluate niche segregation between taxa, providing information of importance for determination of species limits.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper ->
delta C-13, delta N-15, delta O-18, delta H-2, Phylogeography, Speciation, Warbler, Sylvia curruca, trophic ecology, diet, hydrogen, carbon, discrimination, delta-n-15, delta-c-13, feathers, nitrogen, origins, Zoology
Postens nummer:
Posten skapad:
2016-10-13 14:06
Posten ändrad:
2016-10-19 11:02

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