Invasions of non-native organisms are now considered
one of the leading causes of loss of global biodiversity. Hundreds
of aquatic species have been introduced by humans, intentionally
and accidentally, to coastal regions around the world, and introductions
continue unabated. Some of these non-native species have been shown
to have dramatic detrimental effects on native ecosystems. They
may outcompete or prey on native species, affect community dynamics
and food webs, or alter the physical structure of habitats.
Once non-native species are established and widespread, they can
be difficult or impossible to control. However, if detected soon
after initial invasion, non-native species can sometimes be successfully
eradicated. The Elkhorn Slough National Estuarine Research Reserve,
in partnership with the Monterey Bay National Marine Sanctuary and
with funding from the California Sea Grant Program, has therefore
developed an early detection program to widely disseminate information
about potential invaders to local citizens frequenting aquatic habitats.
Following confirmed reports of invasions by these species, a partnership
of regional organizations will work together to implement the most
appropriate rapid response strategy.
This booklet describes two dozen "least wanted" invaders.
These are species that are not yet present in the Monterey Bay region,
but have successfully invaded other coastal regions, becoming extremely
abundant, spreading rapidly, and posing a threat to native ecosystems.
These species were chosen because of their relatively large size
and ability to be identified in the field by non-experts, and because
of their history of invasion in other similar areas. |
