Chironomids (Diptera: Chironomidae) are a family of dipterans with a global distribution. Owing to their great functional diversity and ability to adapt to a wide range of environmental conditions, they often dominate in freshwater macroinvertebrate communities, playing a key role in the cycling of organic matter and the flow of energy in aquatic ecosystems. Our aim was to analyze the structure of chironomid assemblages and identify the environmental factors, including current velocity, river width, water depth, water temperature, dissolved oxygen, percentage of substrate covered by vascular plants, inorganic bottom substrate, and quantity of benthic (BPOM) and transported (TPOM) particulate organic matter, that underpin variation in species richness across a set of lowland rivers in central Poland, differing by stream order and abiotic parameters. Using an Information The oretic Approach, we formulated a set of alternative models based on previously published work, with models fitted in a Bayesian framework using Integrated Nested Laplace Approximation.The species richness of chironomids increased with river order, achieving a maximum in third and fourth order rivers, but decreased at higher orders.The best-fitting models included a positive effect of inorganic substrate index and dissolved oxygen on chironomid species richness. The quality structure of chironomid assemblages reflected the assumptions of the River Continuum Concept showing that species richness was under the influence of factors operating at both a micro- (inorganic bottom substrate) and macro-scale (dissolved oxygen).
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 48 • No. 4