Habitat
The North American Paddlefish, or Polyodon spathula, can be
found in the large rivers in the Mississippi drainage.
Specifically in Wisconsin, these species are found in the lower
Mississippi and St. Croix rivers, however, they are most common
in Lake St. Croix and Lake Pepin. As of 2007, the North
American Paddlefish are extirpated in four states—New York,
Pennsylvania, Maryland, and North
Carolina—endangered/threatened/species of concern in ten
states—Texas, Oklahoma, Alabama, Virginia, West Virginia, Ohio,
Wisconsin, Minnesota, North Dakota, and Montana—declining in
Illinois and Nebraska, and stable in ten states—South Dakota,
Iowa, Missouri, Kansas, Arkansas, Louisiana, Mississippi,
Tennessee, Kentucky, and Indiana. For a pictographic view
of the distribution, see Figures 5-7 below . As for Canada, these
species have been extirpated, meaning that they no longer live
in Canada but are found elsewhere. This decline in
Polyodon spathula is caused by overfishing, pollution, and
modifications to the rivers such as the addition of dams.
Polyodon
spathula mainly live in freshwater, but they can also survive in
water with a mixture of seawater and freshwater.
Paddlefish like to live in deep water greater than six meters
and low current velocity less than five centimeters per second.
In regards to how this organism fits into its niche, little is
known of the American paddlefish’s role in its ecosystem.
Only a few relationships are known about the American
paddlefish. Polyodon spathula are predators of zooplankton
while being prey to other fishes, birds, and humans. This
species of fish can also be
hosts to lamprey.
Figure 5. Paddlefish distribution in the United States and Canada.
Figure 6. Paddlefish distribution in the United States.
Figure 7. Distribution and summary information of the Paddlefish
in Wisconsin.
Key to Summary Information Table:
THR=Threatened
S2=Imperiled in Wisconsin because of rarity (6-20
occurrences or few remaining individuals or acres) or because of some
factor(s) making it very vulnerable to extirpation from the state
G4=Apparently globally secure, though it may be quite rare in parts
of its range, especially at the periphery
Y=Yes
Numerous species also live in the same habitat as the American Paddlefish. Among these species are Daphnia spp., Lake Sturgeon, zebra mussels, small mouth bass, catfish, bluegill, and black crappie. Because there are so many species living in its habitat, the American Paddlefish has had to accommodate in order to be able to locate its food source, the Daphnia spp. To find out more about how the Paddlefish does this, proceed to the Adaptation page.
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