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Energy Sources and Adaptations in the Paraná River Ecosystem: Insights from Recent Studies

This overview explores the energy sources within the Paraná River ecosystem across ten tributaries, highlighting the roles of low-gradient and high-gradient environments, as well as reservoirs. It looks at carbon sources, such as aquatic macrophytes in lowland rivers and algae in reservoirs, based on isotopic analysis of local fish, mollusks, and plants. Additionally, we discuss adaptations of organisms to survive environmental stressors like floods and droughts, including behavioral, morphological, and life history adjustments. Findings from macroinvertebrate studies provide insight into ecological health and the impact of human activities.

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Energy Sources and Adaptations in the Paraná River Ecosystem: Insights from Recent Studies

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Presentation Transcript

  1. Exam topics

  2. Hoeinghaus et al. 2007 • Which river concept explains energy sources in 10 tribs of Parana’ river? • Low-gradient, high gradient, reservoirs • C,N isotopes for fishes, molluscs, plants, detritus • Big conclusions? • Lowland river foodwebs = C from aquatic macrophytes • Reservoirs = C from algae more important • High gradient rivers = C from filamentous algae • Relate to river concept?

  3. Lytle and Poff 2004 Adaptations to survive floods and droughts ID adaptations Modes: know examples Timing of flow = life history adaptations Predictability = behavioral adaptations Magnitude/freq = morphological adaptations Human impacts

  4. Stone et al. 2005 Macroinvertebrates of ag streams What variables impact them? Methods? Sites? Sampling? What attributes were compared? Which attributes varied with physical variables? What impacts caused low scores for macroinvertebrates?

  5. Merritt and CummingsChapter 3 Sampling Devices Sorting, preservation Taxonomic resolution

  6. Merritt and CummingsChapter 5 Habitat, life history Marine paradox Hydraulics Habitats Upstream movements

  7. Merritt and CummingsChapter 6 Ecology and Distribution Tables 6A, 6B, 6C Functional feeding groups

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