AmazingOutdoors.com - Fishing -
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Published on: 6/9/2001
Last Visited: 1/11/2002
Terry Gunn, owner/operator of Lees Ferry Anglers, has watched many of those changes in his years on the river.However, late summer brought an alarming change.This year the river flow was down to 8,000 cfs.The tammies exploded.There's so much growth, it may not allow river access next year.With river access already limited, any additional construction could really discourage fishermen and other users.But more importantly, according to Gunn, it's impacting spawning areas.The gravel won't be there.Tammy, tamarack, salt cedar and tamarisk are names referring to about 55 species of deep-rooted deciduous trees and shrubs native to the Mediterranean area and found eastward into northern China.Tamarisks make up the genus Tamarix of the family tamaricaceae.Used for ornamentation, windbreaks, erosion control and bank stabilization when introduced to the U.S. in the 1800s, tamarisks have spread like wildfire into 23 states and virtually every drainage of the arid and semi-arid Southwest.According to a 1996 report, tamarisks have replaced most of the native vegetation in more than a million acres of riparian habitat and are expected to overwhelm another million acres by 2006.Gunn and other river lovers have reason to be wary of this aggressive plant.Tamarisks can send a primary root down nearly 100 feet in search of water and spread roots nearly 150 feet horizontally.Some mature stands can grow to a height of 40 feet or more.An average-size plant can produce 100,000,000 seeds in a single reproductive period, dropping approximately 70 viable seeds in every square inch of surrounding ground.Seeds can maintain their viability for nearly a month in direct sunlight, nearly two months in the shade, and can winter over in moderate climates.All they take for germination is two hours of exposure to water or high humidity.Tamarisks can germinate during the day or night, even while floating on the water.
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Gunn encourages all anglers to take a break from fishing for an hour or two and spend that time pulling out the non-native tamarisks.Gunn is also concerned because he has detected a change in trout behavior."The fish are already changing spawning behavior because they can't get into traditional spawning areas.I won't be happy until spring and summer shows us what's happening.We'll wait and see."A potentially far-reaching experiment in tamarisk control will be conducted by the Grand Canyon Wildlands Council later this year.A 10-acre plot is being cleared of non-native plant species and being replanted with cottonwoods and willows to see if it can be reclaimed.
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Terry Gunn is concerned about the impact of a non-native plant on an introduced fish species in a man-made tail-water, a non-native plant that has displaced native species and is now the last home of an endangered bird species.