Questions 23-33 are based on the following passage.
Fire as a management tool long [23] predated European settlement of North America. Prescribed fire is a tool used by contemporary resource managers to meet numerous objectives, including reducing fuel loads and continuity, returning fire to an ecosystem, [24] to enhance wildlife habitat, improving forage, preparing seedbeds, improving watershed conditions, enhancing nutrient cycling, controlling exotic weeds, and enhancing resilience from climate change.
Factors that influence fire effects are vegetation type and seral stage, fuel conditions, topography, weather, climate, fire size, burning prescription, fire intensity, fire frequency, and fire seasonality. [26] In many, if not most, situations, prescribed fire is used in vegetation types where fire is a natural disturbance and a critical process influencing ecosystem structure and function. Fire suppression over the past century has disrupted natural fire regimes, and resulting ecosystems deviate considerably from what existed historically.
The realities of global climate change [27] have made it more apparent that there is only a limited understanding of its effects on ecosystems attributes, including wildlife.
This is partly because resulting changes will alter ecological systems and the underlying biotic relationships. Vegetation changes may render areas suitable for some plant and animal species, but unsuitable for others. [28] [29] New mixes of plant species, with unforeseen biotic interactions (e.g., competition, predation), may lead to the emergence of novel wildlife communities. Changes may occur at varying spatial scales, from micro to macro habitats and to landscapes and regions.
[30] Given this quandary, alleviating the problem is a convenient task.
Prescribed fire affects wildlife in various ways. Population responses by species can be positive, negative, or neutral; short- or long-term (or both); and they often change with time.
Whereas prescribed fire can create or maintain habitats for some species, fire can remove or alter conditions in ways that render it unsuitable for other species. Furthermore, a species may benefit from fire in one situation but not another.
Social issues, particularly those surrounding smoke and emissions, constrain where, when, and how managers can burn. Certainly, emission standards enforced by state and federal environmental agencies limit windows of opportunity for burning. Smoke [31] going into human communities is a health concern, especially for people with existing respiratory ailments. Many publics associate smoke with fire and conclude that fire is bad. Progress has been made at educating the public concerning benefits of prescribed fire to reduce threats of wildfire to people and property and also benefits to ecological communities.
[32] As a result, benefits of prescribed fire far outweigh negative effects. [33] They should be applied within a structured adaptive management framework, which requires developing and implementing monitoring systems to evaluate efficacy of specific fire prescriptions. Depending on monitoring results, prescriptions could be applied elsewhere or adjusted to meet management objectives.