Lark Sparrow (Chondestes grammacus) Conservation Status Review
Review Date = 12/22/2011
ScoreH - >1,000,000 individuals
CommentRecent Integrated Monitoring in Bird Conservation Regions (IMBCR) data for 2010 estimates the statewide population at 2,976,574 +/- SD of 506,018.
ScoreG - 200,000-2,500,000 km squared (about 80,000-1,000,000 square miles)
Comment380,531 square kilometers based on Natural Heritage Program range maps that appear on the Montana Field Guide
Area of Occupancy
ScoreU - Unknown
ScoreE - Relatively Stable (±25% change)
CommentSavannah and shrub habitats have remained stable (i.e. +/- 25%) since European arrival.
ScoreE - Stable. Population, range, area occupied, and/or number or condition of occurrences unchanged or remaining within ±10% fluctuation
CommentBBS has high credibility in Montana and shows an insignificant decline of -0.4% per year or 4% decline per decade. WY and ND have positive trends, SD has insignificant negative trends.
ScoreF - Widespread, low-severity threat. Threat is of low severity but affects (or would affect) most or a significant portion of the population or area.
CommentHabitat conversion and invasive species leading to severe fire are probably the greatest threats to the species.
SeverityLow - Low but nontrivial reduction of species population or reversible degradation or reduction of habitat in area affected, with recovery expected in 10-50 years.
CommentSpecies is a moderate generalist in habitat use that uses ecotones between areas with trees and open grassland or shrubland habitats. These habitats, even when disturbed, tend to maintain some sort of structure that is acceptable to the species.
ScopeModerate - 20-60% of total population or area affected
CommentProbably somewhere between 20-60% of savannah and shrub steppe habitats are threatened with severe fire as a result of invasion of non-native grasses and/or conversion of habitat cover types.
ImmediacyLow - Threat is likely to be operational within 5-20 years.
CommentOngoing to small extent, but could accelerate.
ScoreC - Not Intrinsically Vulnerable. Species matures quickly, reproduces frequently, and/or has high fecundity such that populations recover quickly (< 5 years or 2 generations) from decreases in abundance; or species has high dispersal capability such that extirpated populations soon become reestablished through natural recolonization (unaided by humans).
CommentNot Intrinsically Vulnerable. Species matures quickly, reproduces frequently, and/or has a high fecundity such that populations recover quickly (< 5 years or 2 generations) from decreases in abundance. Species has good dispersal capabilities such that extirpated populations generally become reestablished through natural recolonization.
ScoreC - Moderate. Generalist. Broad-scale or diverse (general) habitat(s) or other abiotic and/or biotic factors are used or required by the species but some key requirements are scarce in the generalized range of the species within the area of interest.
CommentModerate Generalist. Uses a variety savannah and shrubby habitats that are structurally open.