|Silver maple-ash swamp
||Stephen M. Young
SubSystem: Forested Mineral Soil Wetlands
State Rarity Rank:
Global Rarity Rank:
Did you know?
The naturally occurring hybrid between silver maple (Acer saccharinum) and red maple (Acer rubrum) is the Freeman's Maple (Acer x freemanii). The leaf lobes of the hybrid are intermediate in length compared to its parents. Freeman's Maple is commonly found in silver maple-ash swamps in the counties along the Lake Ontario shore.
|State Ranking Justification||
There are about a thousand occurrences statewide. Some of the documented occurrences have good viability and many are protected on public land or private conservation land. This community is limited in distribution to the central and western parts of the state, and includes a few large, high quality examples. The current trend of this community is probably stable for occurrences on public land, or declining slightly elsewhere due to moderate threats that include alteration of the natural hydrology and invasive species.
The number and acreage of silver maple-ash swamps in New York have probably declined slightly, or have remained stable, in recent decades as a result of wetland protection regulations.
The number and acreage of silver maple-ash swamps in New York have probably declined substantially from historical numbers, likely correlated with agricultural and other development. Several occurrences were likely converted to open wetland types, such as shallow and deep emergent marsh, by flooding.