7790

• UCREFRP Catalog Number: 7790
• Author: Tyus, H. M., W. P. Dwyer and S. Whitmore.
• Title: Feasibility of Preventing Further Invasion of the Zebra Mussel into the Western United States.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

F/GURE B. /~/YDROLOGY AT D/FFERENT ELEVAT/ONS.
expansion of the species to the
Continental Divide. Thus, it is
assumed that further western expansion
of this species will require the services
of a vector.
However, if zebra mussels are
introduced into headwaters west of the
Continental Divide, they could be
rapidly distributed by downstream
drift of larva. However this spread
would occur differently than has been
the rule in the Eastern United States.
In mountainous portions of the arid
West, water is collected in headwater
reservoirs or withdrawn from receiving
waters, transported via canals, and
~ pumped to agricultural and municipal
areas for consumptive and
nonconsumptive uses. In contrast, at
lower elevations and wetter climates,
effort is spent to drain excess surface
water that occurs from local heavy
rainfall, and transport it to larger
downstream receiving waters and to the
Oceans (Figure 6). Thus, if zebra
mussel are introduced into higher
elevations of the Western United
States, larva could be widely distrib-
uted in a very short period of time.