I. Habitat Description
The deep marsh annuals habitat includes portions of lakes, ponds, marshes, or backwaters that are >10% vegetated with wild rice (Zizania). While this habitat is dominated
by wild rice, it may have inclusions of submersed, non-rooted-floating aquatics, rooted-floating aquatics, or emergent vegetation. Deep marsh annuals are typically
found in areas which are flooded semipermanently and have water depths between 0.25
and 2 meters with a silt or mucky bottom. During normal water conditions, there
is little flow, though there can be wind-generated currents and stronger flows at
inlets and outlets. During flood conditions, these habitats can be connected to
rivers or streams, have strong currents, and the potential to carry large amounts
II. Sensitivity to Oil Spills
The deep marsh annuals habitat is highly sensitive to oil spills. This biologically
diverse habitat provides a home to many plants and animal species, including amphibians,
reptiles, fish, invertebrates as well as a wide variety of migratory waterfowl and
plants. Many animal species use wetlands for reproductive and early life phases,
during which they are most susceptible to the effects of oil. Significant loss of
this habitat would greatly affect the populations of these animals and consequently,
the local ecology. During normal water levels, oil would be less likely to penetrate
water-saturated soils; during floods, oil could be deposited in areas that dry out
after the flood, and penetrate the loose, organic-rich surface soils.
III. Sensitivity to Response Methods
Relevant response tactics are ordered below by least-to-most adverse habitat impact.
Bullet points list quick-reference information regarding the tactic; any potential
adverse impacts of its use; and suggestions for mitigation of these impacts if available.
This is not intended to preclude the use of any particular tactic, but rather to
aid responders in choosing the tactic(s) best suited to a specific habitat. For
more information on a tactic, click on it or go to the corresponding section in
the Inland Response Tactics Manual.