Artículos de revistas
Niche-breadth of freshwater macrophytes occurring in tropicalsouthern African rivers predicts species global latitudinal range
Fecha
2016-09Registro en:
Kennedy, Michael; Lang, Pauline; Tapia Grimaldo, Julissa; Varandas Martins, Sara; Bruce, Alannah; et al.; Niche-breadth of freshwater macrophytes occurring in tropicalsouthern African rivers predicts species global latitudinal range; Elsevier Science; Aquatic Botany; 136; 9-2016; 21-30
0304-3770
CONICET Digital
CONICET
Autor
Kennedy, Michael
Lang, Pauline
Tapia Grimaldo, Julissa
Varandas Martins, Sara
Bruce, Alannah
Moore, Isabel
Taubert, Rebeca
Macleod-Nolan, Chantal
McWaters, Stephanie
Briggs, John
Lowe, Steve
Saili, Kochelani
SICHINGABULA, Henry
Dallas, Helen
Morrison, Sean
Franceschini, Maria Celeste
Willems, Frank
Bottino, Flavia
MURPHY Kevin
Resumen
The study tested the hypothesis that measurement, using multivariate Principal Components Analy-sis (PCA), of the niche-breadth of river macrophyte species in southern tropical Africa, may predicttheir larger-scale biogeographical range. Two measures of niche-breadth were calculated for 44 riverinemacrophyte species, from 20 families commonly occurring in Zambia, using an approach based on PCAordination with 16 bio-physico-chemical input variables. These included altitude, stream order, streamflow, pH, conductivity and soluble reactive phosphate concentration (SRP). In the absence of additionalchemical water quality data for Zambian rivers, invertebrate-based measures of general water qualitywere also used. These were benthic macroinvertebrate Average Score per Taxon (ASPT), and individualabundance of nine macroinvertebrate families with differing water quality tolerance, indicated by theirSensitivity Weightings within the Zambian Invertebrate Scoring System (ZISS). Macrophyte large-scalelatitudinal range was derived from world geopositional records held by online databases, and additionalrecords held by the authors. The two niche-breadth metrics divided the species into narrow-niche andintermediate/broad-niche categories, showing significant variation (from one or both of correlation andANOVA test outcomes) in altitude, stream flow, conductivity, SRP, pH and ASPT, but not stream order.Macrophyte alpha-diversity (as a measure of number of individual niches co-existing per habitat) showedno significant relationship with individual species niche-breadth. Narrow-niche species included a higherproportion of Afrotropical endemics than did species with broader niche size. There were significant pre-dictive relationships between macrophyte niche-breadth and latitudinal range of the target species atglobal and Afrotropical scales, but not for the Neotropics.