A Tale of Two Species€¦ · 21 at Adams Ranch, 7 at Contrabando, 5 at Sant Elena/Terlingua in...
Transcript of A Tale of Two Species€¦ · 21 at Adams Ranch, 7 at Contrabando, 5 at Sant Elena/Terlingua in...
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USFWS
A Tale of Two Species By Mike Montagne
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Fish and Wildlife Service
Strategic Habitat Conservation Southwest Region Emphasis Areas • East Texas/Oklahoma
Big Cypress Bayou Watershed • Rio Grande
Big Bend Reach
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The Species
Rio Grande/Silvery Minnow Big Cypress Bayou/Paddlefish
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American Paddlefish (Polyodon Spathula)
• Status: Texas Threatened • Extirpated from BC Bayou • Recovery Efforts Underway • Ongoing Reintroduction Efforts • Production/Augmentation • Ramsar Site Designation • Long Lived
Rio Grande Silvery Minnow (Hybognathus amarus)
• Status: Federal Endangered • Extirpated From Texas • Recovery Efforts Underway • Ongoing Reintroduction Efforts • Production/Augmentation • Wild and Scenic River
Designation • Short Lived
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The Different Approaches American Paddlefish (Polyodon Spathula)
• Watershed Restoration • Experimental Environmental
Flows in Place • Habitat Restoration • Beginning Larger Scale
Reintroductions
Rio Grande Silvery Minnow (Hybognathus amarus)
• Species Restoration • No Environmental Flows • Limited Restoration • Large Scale Reintroductions
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Rio Grande Silvery Minnow Texas Reintroduction Effort
2008-2017
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Treaty/BBEST/Texas Clean Rivers
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Sand Bars
Eddy
Near Johnson Ranch, Big Bend NP
1945 • Channel spans entire width of
bedrock walls • Alternating sand bars • Active eddy
2008 • Floodplain surface inset within
bedrock walls • Steep, high banks completely
colonized by exotic plants • Eddy has filled with sediment
and is colonized by exotic plants • “floodplain” disconnected from
active channel From Dean and Schmidt 2011
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Stocking RGSM
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Monitoring
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Stocking/Recapture History
Year Number Stocked Stocking Location RGSM Source # Recaptured Comments
2008 431,000
Grassy Banks
SNARRC
Santa Elena
Rio Grande Village
Adam’s Ranch
2009 509,988 See above SNARRC 7 Searched where they were stocked
2010 500,000 See above SNARRC 139 80 in February, 36 in May, 8 in August at Terlingua/Santa Elena, captured some at RGV
2011 304,648 See above SNARRC 109 37 in February, 13 in June, 8 in August, 3 in October, captured some at Boquillas, RGV, Contrabando, and Adams Ranch
2012 120,000 See above SNARRC 42 21 at Adams Ranch, 7 at Contrabando, 5 at Sant Elena/Terlingua in February, 4 at La Linda in April
2013 72,000 Shaffer’s Crossing SNARRC 0
2014 70,000 Shaffer’s Crossing SNARRC 2
2015 312,618 Shaffer’s Crossing SNARRC/UNFH 3
2016
410,931
La Linda SNARRC
41 100's more seen at fosters Spring, no attempt to recapture.
Dryden SNARRC
Fosters UNFH
Total 2,731,185 343 Total to date recaptured
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Future Recommendations
• Suspend reintroduction effort until environmental flows can be implemented
• Implement environmental flows • Use RGSM reintroduction, and other declining
fish species, as a measure of effectiveness of future environmental flow regimes and habitat improvements
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Big Cypress Bayou and Caddo Lake
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Environmental Flows Project
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Ecological Monitoring and Research
• American paddlefish reintroduction • Water quality • Sediment transport • Nutrient monitoring • Riparian forest and soil moisture response to
environmental flows • Bluehead shiner life history and distribution • Giant Salvinia Control (chemical and biological)
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Watershed/Upland Restoration
3 water crossings replaced with a bridge and rerouted another on 7.1 miles of Prairie Creek in 2017. (Partners Program)
(Prescribed fire)Within the Cypress Basin 5 projects, 2,747 acres
($106,000 spent by program and $154,000
by private landowners)
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National Wildlife Refuge System
• Established Caddo Lake National Wildlife Refuge in 2000
• Caddo Lake National Wildlife Refuge
contributes refuge water rights to help meet the recommended environmental flows out of Lake o’ the Pines
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Paddlefish Reintroduction • Initial funding provided by USACE, USFWS,
and the Caddo Lake Institute • Fish provided by Tishomingo NFH, and hauled
by TPWD in special tanks for paddlefish
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Paddlefish Decline
• In 1959, Ferrell’s Bridge Dam was completed creating Lake O’ the Pines, and the paddlefish fishery began to decline, and was gone by 1980.
• The population likely crashed due to loss of spawning shoals and increased sedimentation caused by the altered hydrological regime that reduced spring flood pulses and restricted channel connectivity to backwater areas.
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Previous Paddlefish Reintroduction • Between 1992 and 1998, as part of a larger paddlefish
restoration project in 6 watersheds by Texas Parks and Wildlife Department.
• Over 73,438 fingerling paddlefish were stocked into Caddo Lake and Big Cypress Bayou, averaging less than 250 mm in total length (TL).
• No returns were documented in Caddo Lake or within the Big Cypress Bayou. The results of the larger paddlefish project were also not encouraging.
• Recapture rates in other systems were extremely low, and no survival rates or population estimates were able to be calculated.
• However, none of the recapture efforts were in the BCB or Caddo Lake.
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Phase 1 and 2
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Phase 3 Long Term (10 year)
Stocking Plan Tracking Juveniles into
Adulthood
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Aquatic Habitat Restoration Spawning Shoal Mapping Restoring Nursery Habitat
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Outreach Collins Academy
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Watershed vs. Species Restoration Big Cypress Bayou Rio Grand Silvery Minnow
• Many more partners • Paddlefish staying in system • Recaptured many of them • Good Health • Environmental flows
through 2021 • Additional life history stages
to be examined
• Not taking hold • Other species declining • No reliable water except
spring influenced canyon sections
• No environmental flows in immediate future