Abstract：
:Mesohabitat components such as substrate and surface flow types are intimately related to benthic macroinvertebrate assemblages in streams. Visual assessments of the distribution of these components provide a means of evaluating physical habitat heterogeneity and aid biodiversity surveys and monitoring. We determined the degree to which stream site and visually assessed mesohabitat variables explain variability (i.e., beta-diversity) in the relative abundance and presence-absence of all macroinvertebrate families and of Ephemeroptera, Plecoptera, and Trichoptera (EPT) genera. We systematically sampled a wide variety of mesohabitat arrangements as they occured in stream sites. We also estimated how much of the explanation given by mesohabitat was associated with substrate or surface flow types. We performed variation partitioning to determine fractions of explained variance through use of partial redundancy analysis (pRDA). Mesohabitats and stream sites explained together from 23 to 32% of the variation in the four analyses. Stream site explained 8-11% of that variation, and mesohabitat variables explained 13-20%. Surface flow types accounted for >60% of the variation provided by the mesohabitat component. These patterns are in accordance with those obtained in previous studies that showed the predominance of environmental variables over spatial location in explaining macroinvertebrate distribution. We conclude that visually assessed mesohabitat components are important predictors of assemblage composition, explaining significant amounts of beta-diversity. Therefore, they are critical to consider in ecological and biodiversity assessments involving macroinvertebrates.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Silva DR,Ligeiro R,Hughes RM,Callisto Mdoi
10.1007/s10661-014-3797-3subject
Has Abstractpub_date
2014-09-01 00:00:00pages
5479-88issue
9eissn
0167-6369issn
1573-2959journal_volume
186pub_type
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