Non-Forested Wetlands

Non-Forested Wetlands

Taxonomy Machine Name
sector_nonforested_ecosystems
Taxonomy Alias
nonforested_ecosystems
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Calcareous Fen is highly vulnerable to climate change. Many sites are small and isolated with minimal opportunities for species to shift or migrate, giving fens high inherent vulnerability.

Submitted by dshannon on

Hydrologic regimes may change, although both an increase in groundwater recharge as well as decreases in ground water levels are possible. In general, shallow groundwater aquifers are expected to change more than deep aquifers. If groundwater levels and associated discharge and upwelling remain steady, sites with intact hydrology may be more resistant to change. Increased nutrient enrichment of groundwater is likely and could fuel an expansion of invasive species. Increased human demand for groundwater resources will also likely be an issue in some regions.

Boreal Rich Fen is highly vulnerable to climate change. Highly specific hydro-geologic requirements make it nearly impossible for Boreal Rich Fens to shift within larger peatland complexes or in the larger landscape.

Submitted by dshannon on

Potentially lower groundwater levels from increasing evaporation combined with groundwater withdrawals could reduce groundwater upwelling. However, some models suggest that hydrologic changes may be minimal with similar to slightly increased precipitation and higher groundwater recharge projected. In addition, sites fed by deep aquifers are expected to experience less hydrologic change. Nutrient enrichment through changing land use or groundwater pollution may be one of the greatest threats and could increase non-native invasive species.

Bog Relict is moderately to mod.-high vulnerable to climate change. Changing hydrologic regimes could alter this system though Sphagnum and floating mats may buffer future changes. Sites may transition to native shrub-carr or marsh if tamarack is lost.

Submitted by dshannon on

Potential changes in precipitation patterns and groundwater infiltration could alter hydrologic regimes, though both floating mats and sites with abundant Sphagnum may buffer some of these potential future changes. Glossy buckthorn and non-native cat-tail are also major concerns and will benefit from projected increases in nutrient loading of groundwater and surface water as well as longer growing seasons. Tamarack, the major tree species of Bog Relict, is projected to decline, although as a pioneer species, it has the ability to regenerate rapidly when conditions are favorable.

Alder Thicket is low to moderately-low vulnerable to climate change. Higher water levels over the long-term could convert some sites to marsh. Alder has the potential to expand as other communities decline.

Submitted by dshannon on

More frequent large rain events could increase sedimentation and soil disturbance, leading to increases in non-native invasive species. Nutrient loading of both groundwater and surface water could also fuel invasives. Potential changes in precipitation patterns and groundwater infiltration could alter hydrologic regimes. Although Alder Thicket is generally adapted to short-term water level fluctuations, higher water levels over the long-term could convert some sites to marsh.

Non-forested wetland plants at the southern edge of their range may be vulnerable and sensitive to warming, changing hydrology, and increased runoff.

Submitted by dshannon on

With a few exceptions, many dominant non-forested wetland plants also occur well in southerly locations, indicating they may be less sensitive to changes in temperature than to changes in the delicate balance in hydrologic regimes and nutrients. Those species that may be most vulnerable tend to be associated with communities that occur at the southern edge of their range, such as Boreal Rich Fen, Shore Fen, and, in the southern part of the state, Bog Relict and Alder Thicket.

Non-native invasive plants may increase in productivity and may invade into new wetland areas.

Submitted by dshannon on

Non-native invasive species are already a problem in many wetland communities. Longer growing seasons disproportionally benefit invasives like reed canary grass, which can continue growing longer in the fall than native grasses and sedges. In addition, sedimentation and excess nutrients favor species like non-native cattail and Phragmites. Elevated levels of atmospheric CO2 may favor woody species, including invasive shrubs like glossy buckthorn.

Wetlands are dependent on hydrology. More frequent and intense storms may increase harmful inputs, while seasonal precipitation may become more variable affecting surface and groundwater-fed communities in unpredictable ways.

Submitted by dshannon on

Altered hydrology is the greatest anticipated impact on non-forested wetlands due to climate change. The likelihood of more extreme precipitation events increases the risk of erosion and sedimentation as well as nutrient runoff, which can fuel the transportation and growth of non-native invasive plants and weedy native species. The impact of these events is likely to be greatest lower in the watershed, where floodwaters collect for a longer period of time.

Non-forested wetland

Submitted by dshannon on

Wetland is a natural community group that broadly characterizes several distinct natural communities. Non-forested wetlands broadly includes: Alder Thicket, Bog Relict, Boreal Rich Fen, Calcareous Fen, Central Poor Fen, Coastal Plain Marsh, Emergent Marsh, Ephemeral Pond, Moist Sandy Meadow, Muskeg, Northern Sedge Meadow, Open Bog, Pattered Peatland, Poor Fen, Shore Fen, Shrub-Carr, Southern Sedge Meadow. Some wetlands like sedge meadows and Shrub-carr are tolerant of a wide variety of water levels, while Emergent Marsh already thrives in high nutrient environments.