By Lucas Wandrie, Sr Wildlife Ecologist, WSB

Although it is well-known that wind-energy projects have need for wildlife services, it is less known that wildlife services provide value for utility-scale solar projects. Wildlife services may be needed at different phases of project development depending on state guidelines. State permits, project off-takers or financiers often require wildlife assessments for utility-scale solar projects. Learn more about what you need to be aware of at each stage of a project.

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Biological assessment or site characterization study

A biological assessment or site characterization study is recommended to identify biological resources that may be impacted by the project including wildlife and fish communities, sensitive habitats, special status species and their habitats, and special management areas. The information gained from biological assessments and site characterization studies can help determine if additional field studies for special status species or sensitive habitats or special status species desktop-level habitat assessments are recommended, and guide project layouts.

Pre-Construction

Raptor nest and eagle nest surveys

Raptor nests, including those of eagles, are protected by the Migratory Bird Treaty Act (MBTA) and eagle nests are further protected by the Bald and Golden Eagle Protection Act (BGEPA). If project construction is planned during the nesting season, it is recommended that raptor nest surveys be conducted. The nesting season varies based on region with earlier start dates in the south. Also, raptor nest surveys are typically conducted prior to leaf-on to locate nests easier. Below are two examples of the need for such surveys.

Northern Harrier

Although many raptor species nest in trees, some species such as the northern harrier (Circus hudsonius) nest in herbaceous areas. The northern harrier is state listed in many states, and some states such as Ohio require nesting surveys when construction activities occur in herbaceous areas during the nesting season. 

Bald and Golden Eagles

Bald (Haliaeetus leucocephalus) and golden (Aquila chrysaetos) eagle nests have additional protective measures and guidance under the BGEPA. The U.S. Fish and Wildlife Service guidance recommends a no disturbance buffer of at least 660 feet surrounding the nest, whether the nest is active or an alternate nest, unless similar activity occurs closer to the nest. If similar activity occurs closer than 660 feet from the nest, a no disturbance buffer of the same distance as the activity can be used. As the process to remove an eagle nest is long and costly, an eagle nest survey can help identify if there are any in the area that could be avoided during the site design process or during the construction process.

Bat habitat assessment

Many bat species roost in trees during their respective active seasons; some of these species are protected at the state or federal level. As such, tree removal within the ranges of protected bat species requires measures to avoid or minimize adverse impacts or incidental take. Avoidance or minimization measures include removing trees outside of the protected species’ active seasons, conducting habitat assessments to determine if the trees are potentially suitable roost sites, presence/probable absence surveys, or in some instances tree removal is entirely prohibited. Bat habitat assessments are often conducted when tree removal is proposed to occur during the active seasons (April 1 to October 31) of the federally endangered Indiana bat (Myotis sodalis) and the federally threatened northern long-eared bat (Myotis septentrionalis). The ranges of the Indiana bat and northern long-eared bat extend throughout much of the eastern United States. Some states, such as Missouri, have additional guidance measures that need to be followed regarding tree removal within the range of federally listed bat species. The bat habitat assessment provides information used to determine where tree removal can occur and whether tree removal can occur during the active season, or if tree removal activities should be postponed. Bat habitat assessments can be conducted at any time of the year.

During Construction

Environmental Compliance

Bird nest surveys may be needed depending on the geographic region of the project, construction timing, and the habitat types where construction activity will occur. The nests of bird species are protected by the MBTA. Nesting surveys are recommended if construction activities are planned to occur in non-agricultural areas during the active nesting season. The active nesting season varies based on region with nesting activity starting earlier at southern latitudes. If active nests are observed during survey efforts, a no disturbance buffer is established until the offspring are fledged or the nest is abandoned. The size of the buffer depends on the species, with smaller buffers used for nest of common species and larger buffers used for nests of rare species and raptors.

Conclusion

Ultimately, understanding the resources within and near your project site early in project development can reduce the risk of costly design revisions as well as the risk for permitting or construction delays.   Although the focus of this piece was on avian and bat-related services for utility-scale solar projects, wildlife services can also help with project-related concerns involving other taxonomic groups including invertebrates (such as the rusty patched bumble bee [Bombus affinis] and Dakota skipper [Hesperia dacotae]) and reptiles (such as the eastern massasauga rattlesnake [Sistrurus catenatus] and Blanding’s turtle [Emydoidea blandingii]).  For additional questions regarding the need for and value of wildlife surveys, contact Lucas Wandrie.

By Tony Havranek​, Director of Fisheries, WSB

Wildfires are dominating headlines this summer as cities across the United States are dealing with the dangerous air conditions created by the fires in Canada. Wildfires can be incredibly scary, ushering in unwanted destruction and loss of property, but it can also be a tool for rebirth and habitat restoration.

As an ecologist, I have used controlled fire as a tool. Taking a long view of plants and wildlife, many species rely on a natural cycle of disruption that includes fire, wind, animals and more. The Jack Pine, for example, requires fire to help open its cone and release seeds. Many invasive species don’t require cycles of disruption, on the other hand, and thrive among human development.

What are the Risks that Wildfire Bring?

The clearest risk with any uncontrolled fire is destruction of life and property. Wildfires are incredibly dangerous, and this summer’s hot, dry weather helped exacerbate fires in the north. Furthermore, as climate change brings more extreme weather conditions, the carbon released from large wildfires drives further warming, feeding the cycle for more extreme weather events.

Poor forest management and extreme weather can also cause fires to burn more intensely. Too much fuel load – material in a given area that burns and can dramatically increase the intensity of a fire –means that a fire may burn faster and hotter. Intense wildfires can destroy soil to the point it is hydrophobic, repelling water instead of absorbing it. It can also destroy good bacteria and fungi in topsoil. The destruction of soil from extreme wildfires can make it more difficult for new plants to grow, cause soil erosion that pollutes streams and waterways, increase the risk of flash flooding and harm local ecosystems.

As fire crews work to fight wildfires, that can also bring some environmental risk. The flame retardant used to control the spread of fires can be toxic to certain plants and animals. And when fire crews travel from one part of the country to another to fight large wildfires, they can unintentionally introduce invasive species to new regions.

What are the Environmental Benefits?

When we read about wildfires in the news, the stories are often focused on destruction, but fire can bring environmental and ecological benefits too. Because humans have disrupted many of the natural fire cycles, burning can help reset plant species. Plants are an essential building block to ecosystems, and new plant growth can help reattract or grow the population of numerous native wildlife species. Moose, bears and deer are some of the species that can be positively impacted by regeneration after fires.

Better Planning for Fires and Other Natural Disasters.

While proper forest management and use of controlled fire helps mitigate the risk of destructive wildfires, climate change and human activity means wildfires, unfortunately could become more commonplace in certain parts of the world. Planning for and building defensible space and structures reduces risk from wildfires. Working with municipalities at WSB, we often talk about planning for flooding, erosion, hurricanes and other extreme weather events to protect infrastructure, people and native wildlife.

For communities, especially those that face a greater risk of wildfire due to climate change and other factors, assessing the threat of fire and integrating defensible space and structures into planning is critical. I expect that to become a more prevalent consideration as part of innovative municipal planning in future decades.

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