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GCPLCC Instream Flow Project

GCPLCC Instream Flow Project. DRAFT Regional Flow-Ecology Hypotheses: Examples and Format. October 19, 2012. Categories of Flow-Ecology Hypotheses. Biotic Interactions Species Guild Community Water quality DO Temperature. Physical Habitat Availability Energy Supply - OM Transport.

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GCPLCC Instream Flow Project

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  1. GCPLCC Instream Flow Project DRAFT Regional Flow-Ecology Hypotheses: Examples and Format October 19, 2012

  2. Categories of Flow-Ecology Hypotheses • Biotic Interactions • Species • Guild • Community • Water quality • DO • Temperature • Physical Habitat • Availability • Energy Supply • - OM Transport

  3. GCPLCC Regional Flow-Ecology HypothesesSubsistence Flows + Water Quality Parameter 0 Ecoregion: Coastal River Class: small, low gradient, warm streams and rivers Subsistence Flow Hypothesis #1: Dissolved oxygen and temperature are adversely affected by reduced magnitude of subsistence flows Effected species: All fish, mussels, and other riverine species sensitive to and unable to avoid low oxygen and high temperatures Dissolved Oxygen Temperature - + - 0 Altered subsistence flow – magnitude Source: Sabine-Neches BBEST Biological Overlay Appendix XIII

  4. Alternate Graphical F-EH Format GCPLCC Regional Flow-Ecology HypothesesSubsistence Flows 0 Altered Water Quality Parameter Ecoregion: Coastal River Class: small, low gradient, warm streams and rivers Subsistence Flow Hypothesis #1: Dissolved oxygen and temperature are adversely affected by reduced magnitude of subsistence flows Effected species: All fish, mussels, and other riverine species sensitive to and unable to avoid low oxygen and high temperatures Dissolved Oxygen Temperature + - 0 Altered subsistence flow – magnitude Source: Sabine-Neches BBEST Biological Overlay Appendix XIII

  5. GCPLCC Regional Flow-Ecology HypothesesSubsistence Flows + Abundance 0 Ecoregion: All River Class: headwaters, streams, and small rivers Subsistence Flow Hypothesis #2: Extended periods of subsistence flows strands fish in pools and other isolated bodies of water (e.g., oxbows) where they become concentrated and predation increases. Effected species: Channel and blue catfish, small mouth buffalo, gar , and other large and small fish Predatory species Prey - + - 0 Altered subsistence flow – duration Source: Sabine-Neches BBEST Biological Overlay Appendix XIII

  6. GCPLCC Regional Flow-Ecology HypothesesBase Flows + Ecoregion: All River Class: All Base Flow Hypothesis #1: Sediments become more stable during periods of extended base flow, which is beneficial for many mussel species. (Vaughn and Taylor 1999, Strayer 2008) Base Flow Hypothesis #2: Mussels feed on higher densities of water-column food resources during periods of extended base flow (Rypel et al. 2009) Effected species: All mussel species (e.g., Quadrulafragosa (Winged mapleleaf), Leptodealeptodon (Scaleshell) # of mussel species 0 - + - 0 Altered base flow – duration Source: Sabine-Neches BBEST Biological Overlay Appendix XIII

  7. GCPLCC Regional Flow-Ecology HypothesesBase Flows + Abundance 0 Ecoregion: All River Class: headwaters, streams, and small rivers Base Flow Hypothesis #3: Sight-oriented predatory fish can exploit prey populations that are at high densities and in clear water during extended periods of base flows, especially during summer and fall. Effected species: Sight-oriented predatory fish and their prey Predatory fish species Prey - + - 0 Altered base flow – duration Source: Sabine-Neches BBEST Biological Overlay Appendix XIII

  8. GCPLCC Regional Flow-Ecology HypothesesBase Flows + Ecoregion: River Class: headwater, streams, and small rivers, moderate gradient Base Flow Hypothesis #4: Reduced base flow exposes riffles reducing the extent of available habitat and the abundance of riffle-obligate species. Effected species: All riffle-obligate species (e.g., Etheostomaspectabile (Orangethroatdarter)) Abundance of riffle-obligate species 0 - + - 0 Altered base flow – magnitude Source: TNC-OK

  9. GCPLCC Regional Flow-Ecology HypothesesHigh Flow Pulses + Parameter 0 Ecoregion: River Class: High Flow Pulse Hypothesis #1:. Effected species: Parameter #1 Parameter #2 - + - 0 Altered High Flow Pulses– duration Source:

  10. GCPLCC Regional Flow-Ecology HypothesesOverbanking Flows + Parameter 0 Ecoregion: River Class: Overbanking Flow Hypothesis #1:. Effected species: Parameter #1 Parameter #2 - + - 0 Altered Overbanking Flow– duration Source:

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