Biological Invasions of Cold-Water Coastal Ecosystems - Aquatic ...

Chapt 9C4. Peracaridan Crustaceans, page 9C4- 17
Figure 9C4.7. Native, introduced and cryptogenic amphipod numbers with temperature from 34 ballast water
samples.
Figure 9C4.8. Native, introduced and cryptogenic amphipod numbers with salinity from 34 ballast water samples.
The great diversity of invading species in northeast Pacific estuaries may thus result, in
part, from the great diversity of climates that invading species are adapted to relative to the
narrow range of climates in the region. The low diversity of native northeast Pacific species that
invade other areas may also result, in part, from the relatively broad range of climate variations
they must endure to survive elsewhere. The decline of northeast Pacific NIS diversity from
south to north coincides with fewer introductions occurring where greater annual variations in
temperature occur and where low salinity conditions occur during warm water periods.
All of the peracaridan NIS known from Puget Sound occurred also in San Francisco Bay.
The absence of cold water NIS in Southern Alaska is consistent with a pattern of introductions