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

PATHWAYS
.. - urther western invasion of zebra
mussels would occur as a carrier
(vector) transmits the species by the
use of various pathways. Land pathways
would require the services of a vector,
but water pathways may (upstream
transport) or may not (downstream
transport) require a vector (Figure 4).
There are two geographic routes of
importance for further western spread
LA/VO
ROAD PATHWAY
(CARRIER REQUIRED)
CARRIERS
of zebra mussels in the United States:
one from the eastern United States and
I
one from Canada. Except for veliger
transport from Canadian Rivers, this
~I spread would require a vector along
land and water routes (Figure 5) as
documented by Carlton (1993) who
reported zebra mussels transport by 3
natural and 20 human-related mecha-
nisms (Table 2). The rapid spread of
zebra mussels experienced in North
PREVENTION
7,
r
PASSES THROUGH UNCHECKED
w,a TER
UPRIVER PATHWAY
(CARRIER REOUIREDJ
DOWNRIVER PATHWAY
(NO CARRIER REQUIRED)
CARRIERS PREVENTION
~~
F/GORE 4. LAND ANO WATER PATHWAYS.
PASSES
THROUGH
UNCHECKED