Author : Reid M. Northwick
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)
Book Synopsis Production of Suspension-feeding Caddisflies (Trichoptera: Hydropsychidae) in Pool 8 of the Upper Mississippi River by : Reid M. Northwick
Download or read book Production of Suspension-feeding Caddisflies (Trichoptera: Hydropsychidae) in Pool 8 of the Upper Mississippi River written by Reid M. Northwick and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large river systems such as the Mississippi River contain complex food webs with many interactions among trophic levels supporting immense quantities of fish and macroinvertebrate biomass. Research has been conducted in the areas of food web analysis and trophic structure, but little of this research has focused on large river systems and secondary production. Secondary production is an important part of these trophic structures, allowing for the acquisition and transfer of energy from lower trophic levels to higher trophic levels. Secondary production by suspension-feeding hydropsychid caddisflies colonizing hard substrates is a poorly understood and potentially consequential aspect of these food webs. Hydropsychid caddisflies were sampled using Hester-Dendy artificial substrates placed in the main-channel border areas during the growing season and sampled monthly for three years from 2006-2008 in Navigation Pool 8 of the Upper Mississippi River (UMR) near La Crosse, WI, USA. Individuals from collected samples were identified to species and analyzed using imaging software. Estimates of production for Hydropsyche orris and Cheumatopsyche campyla, 440 and 71 g DW • m-2 • yr-1 respectively, exceeded estimates from many other large river systems. Production by hydropsychids in the UMR appears to be linked to changes in flow leading to decreased water temperatures and concentrations of their seston food source. This study demonstrates the potential importance of secondary production by hydropsychid caddisflies in large river aquatic food webs. Changes to these systems caused by management decisions, climate change, and competitive pressure from invasive species could negatively impact macroinvertebrate production and underscores the need for further research.