Environmental harshness and global richness patterns in glacier-fed streams.

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dc.careerCiencias Biológicasen_US
dc.category.authorvisitoren_US
dc.contributor.authorDangles, Olivier Jacques
dc.contributor.correspondingJacobsen, Deanen_US
dc.countryEcuadoren_US
dc.date.accessioned2023-11-04T21:37:23Z
dc.date.available2023-11-04T21:37:23Z
dc.date.issued2012
dc.dedication.authorTPen_US
dc.description.abstractAim: To test for a possible effect of environmental harshness on large-scale latitudinal and elevational patterns in taxon richness of macrofauna in arctic and alpine glacier-fed streams. Location: Svalbard (79° N), Iceland (65° N), Norway (62° N), Switzerland and Italy (46° N), France (43° N), New Zealand (43° S) and Ecuador (0°), covering an elevational gradient from sea level to 4800 m a.s.l. Methods: We gathered data from 63 sites along 13 streams and created an index of glacial influence (the glacial index, GI) as an integrative proxy for environmental harshness. The explicative power of the GI, environmental variables, latitude and elevation on taxon richness was tested in generalized linear models. Taxon richness along geographical gradients was analysed at standardized levels of GI in contour plots. Beta diversity and assemblage similarity was calculated at different GI intervals and compared with a null-model. Results: Overall, taxon richness decreased exponentially with increased GI (r2= 0.64), and of all included factors, GI had the highest explicative power. At low values of GI we found that local taxon richness varied along the coupled gradients of latitude and elevation in a hump-shaped manner. However, this pattern disappeared at high values of GI, i.e. when environmental harshness increased. Beta diversity increased, while similarity among assemblages decreased towards high GI values. Main conclusions: In our study system, the number of taxa able to cope with the harshest conditions was largely independent of the regional taxon pool, and environmental harshness constituted a ‘fixed’ constraint for local richness, irrespective of latitude and elevation. Contrary to expectations, we found that beta diversity was highest and similarity lowest among the harshest sites, suggesting that taxon richness was not solely driven by niche selection based on environmental tolerances, but also stochastic ecological drift, leading to dispersal-limited communities.en_US
dc.facultyCiencias Exactas y Naturalesen_US
dc.id.author05H164551en_US
dc.id.type2en_US
dc.identifier.doi10.1111/j.1466-8238.2011.00699.xen_US
dc.identifier.issn1466822X
dc.identifier.urihttp://onlinelibrary.wiley.com/doi/10.1111/j.1466-8238.2011.00699.x/fullen_US
dc.identifier.urihttps://repositorio.puce.edu.ec/handle/123456789/5597
dc.indexed.databaseScimago Journal Ranken_US
dc.list.authorsJacobsen, D., Dangles, O.en_US
dc.magazine.pageRange647–656en_US
dc.magazine.titleGlobal Ecology and Biogeographyen_US
dc.magazine.volumeChapter21 (6)en_US
dc.rightsClosedAccessen_US
dc.statepublisheden_US
dc.subjectAquatic macroinvertebratesen_US
dc.subjectBenthic communitiesen_US
dc.subjectDispersal limitationen_US
dc.subjectGeographical gradientsen_US
dc.subjectGlacial riversen_US
dc.subjectNiche selectionen_US
dc.subjectLarge-scale patternsen_US
dc.subjectSimilarityen_US
dc.subjectTaxon richnessen_US
dc.titleEnvironmental harshness and global richness patterns in glacier-fed streams.en_US
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