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

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dc.careerCiencias Biológicases
dc.category.authorvisitoren_US
dc.contributor.authorDangles, Olivier Jacques
dc.contributor.correspondingJacobsen, Dean
dc.countryEcuadores
dc.date.accessioned2023-11-04T21:37:23Z
dc.date.available2023-11-04T21:37:23Z
dc.date.issued2012
dc.dedication.authorTPes
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 Naturaleses
dc.id.author05H164551
dc.id.type2
dc.identifier.doi10.1111/j.1466-8238.2011.00699.x
dc.identifier.issn1466822X
dc.identifier.urihttps://repositorio.puce.edu.ec/handle/123456789/5597
dc.identifier.urihttp://onlinelibrary.wiley.com/doi/10.1111/j.1466-8238.2011.00699.x/full
dc.indexed.databaseScimago Journal Rankes
dc.language.isoen
dc.list.authorsJacobsen, D., Dangles, O.
dc.magazine.pageRange647–656
dc.magazine.titleGlobal Ecology and Biogeographyen_US
dc.magazine.volumeChapter21 (6)
dc.rightsClosedAccessen
dc.statepublisheden_US
dc.subjectAquatic macroinvertebrateses
dc.subjectBenthic communitieses
dc.subjectDispersal limitationes
dc.subjectGeographical gradientses
dc.subjectGlacial riverses
dc.subjectNiche selectiones
dc.subjectLarge-scale patternses
dc.subjectSimilarityes
dc.subjectTaxon richnesses
dc.subjectAquatic macroinvertebrates
dc.subjectBenthic communities
dc.subjectDispersal limitation
dc.subjectGeographical gradients
dc.subjectGlacial rivers
dc.subjectNiche selection
dc.subjectLarge-scale patterns
dc.subjectSimilarity
dc.subjectTaxon richness
dc.titleEnvironmental harshness and global richness patterns in glacier-fed streams.en_US
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