Economic Sectors at Risk from Invasive Aquatic Weeds for the
Kissimmee Chain of Lakes in Osceola County,
Florida, 2004-2005
Frederick W. Bell, Florida State University
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Economic Sectors at Risk From Invasive Aquatic Weeds at Lake
Istokpoga, Florida
Frederick W. Bell, Mark A Bonn, Florida State University
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"In summary, we have concluded that many facets of the economy
are at risk from invasive aquatic weeds, especially hydrilla, which fall under
(1) the organized market “effects” and (2) outdoor recreation based upon common
property resources and values that are not traded in an organized market (i.e.,
non-market). Successful hydrilla management in Lake Istokpoga will sustain
almost $40 million per year in numerous “market sales” and support about $.88
million in “non-market” recreational value, placing Lake Istokpoga as an asset
at a minimum of $25 million. These enormous figures should be compared with
costs of invasive aquatic weed control, and in developing strategies to
accommodate hydrilla management."
Summary of a Survey of the Literature on the
Economic Impact of Aquatic Weeds
H. William Rockwell, Jr.*, Ph. D, for the Aquatic Ecosystem
Restoration Foundation
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Abstract
Invasive aquatic plants affect aesthetics, drainage for agriculture and
forestry, commercial and sport fishing, drinking water quality, fish and
wildlife habitat, flood control, habitats for other plants, human and animal
health, hydropower generation, irrigation, navigation, recreational boating,
swimming, water conservation and transport, and, ultimately, land values.
Because most invasive aquatic plants species have been introduced to this
country from abroad, they do not have natural control agents or competitors and
they tend to dominate the aquatic systems to which they are exposed. The
magnitude of only a few of their impacts has been measured and then, generally,
over limited areas. A few well-documented studies, however, provide a basis for
estimating the general scale of these affects for the nation as a whole, and
might serve as a guide for an appropriate magnitude of response.
There are difficulties in estimating the economic impacts of aquatic weeds
(or, conversely, the benefits of their control) due to the
"public-good" nature of aquatic resources and the resulting fact that
few of these impacts or benefits pass through economic markets. In spite of
these difficulties, it can be conservatively estimated that the values-at-risk
from aquatic invasive plants in the US is in the range of billions of dollars
per year.
Significant sums (at least $100 million) are spent each year in the control
of aquatic weeds, however, and the estimated benefits of control are
consistently reported to be much higher than these costs. Given the continuing
spread of problem species and the difficulty of organizing collective action to
control aquatic weeds, it seems likely that too little is being spent on control
rather than too much. Furthermore, much could be done to facilitate the further
development and use of aquatic weed control techniques.
Although the costs and environmental effects of aquatic weed control have
been intensively studied, new technologies for their control are continually
being evaluated and developed. Continued attention seems warranted to develop
weed control techniques and strategies that moderate costs, meet competing
objectives, and minimize the potential for unintended environmental harm. In
addition, an accelerated invasion of exotic animal species suggests a more
integrated approach to the management of aquatic ecosystems.
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