Grassland bird surveys in north Valley County, Montana : 2001-2006 /

Carlson, John C.; Currier, Coburn; Hendricks, Paul; Lenard, Susan.

doi:10.5962/bhl.title.65358

Cited by 2 publications

(6 citation statements)

References 46 publications

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“…The remaining Species of Concern birds detected every year of our study (Table 3) (Figure 2) are probably in part a response to drought conditions elsewhere (Yackel Adams et al 2006, Lenard et al 2006, Hendricks et al 2007; Lark Bunting is also sometimes associated with a low density of shrubs (Feist 968,Bock and Bock 987,Johnsgard 200). The weak relationship of Sprague's Pipit and Grasshopper Sparrow abundances with spring precipitation was unexpected.…”

Section: Chestnut-collared Longspurmentioning

confidence: 74%

“…Next in order of relative abundance were Horned Lark, Western Meadowlark, Sprague's Pipit (SOC), and Baird's Sparrow (SOC); each species was detected every year on at least 30% of our count points. The percentages presented in Table 3 are generally conservative (compare with Table 3 in Hendricks et al 2007), as most species were detected on additional point counts beyond the boundary of our 100 m fixed-radius count circles, data not included in the present report.…”

Section: Chestnut-collared Longspurmentioning

confidence: 83%

“…The purpose of this report is to provide a summary of project activities during 200 -2007200 - , supplementing Lenard et al (2006 and Hendricks et al (2007). In this report we ) identify the regular grassland-breeding bird community in north Valley County (revised from earlier reports), 2) provide an assessment of the status of a suite of Montana bird Species of Concern (SOC) that are members of this community, 3) identify the role spring precipitation plays in fluctuations of these species through its effects on vegetation structure, and 4) describe the range of vegetation conditions where each species settled during the nesting period.…”

Section: Introductionmentioning

confidence: 88%

“…We conducted 40 point counts in north Valley County during 200-2007 (Table ); more than 75 species of birds were detected at least once (see Lenard et al 2006, Hendricks et al 2007. We recorded 28 species either actually on or flying over the points in 2007.…”

Section: Overviewmentioning

confidence: 99%

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Surveys for grassland birds of the Malta Field Office-BLM, including a seven-year study in north Valley County /

Carlson¹,

Currier²,

Hendricks³

et al. 2008

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Section: Chestnut-collared Longspurmentioning

confidence: 74%

Section: Chestnut-collared Longspurmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 88%

Section: Overviewmentioning

confidence: 99%

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Surveys for grassland birds of the Malta Field Office-BLM, including a seven-year study in north Valley County /

Carlson¹,

Currier²,

Hendricks³

et al. 2008

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“…This region contained large patches of arid soils, which provided habitat for longspurs and made them locally abundant in such areas. These specific sites consisted of aridic, well-drained glacial soils of the Elloam series and had relatively low (<1000 kg ha −1 ) vegetation production potential (Lenard et al, 2006;Lipsey, 2015).…”

Section: Study Area and Site Selectionmentioning

confidence: 99%

Detecting ecological traps in human‐altered landscapes: A case study of the thick‐billed longspur nesting in croplands

Swicegood

Ellison²,

Sather

et al. 2023

Ecology and Evolution

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Conversion of the North American prairies to cropland remains a prominent threat to grassland bird populations. Yet, a few species nest in these vastly modified systems.Thick-billed longspurs historically nested in recently disturbed or sparsely vegetated patches within native mixed-grass prairie, but observations of longspurs in spring cereal and pulse crop fields during the breeding season in northeastern Montana, USA, suggest such fields also provide cues for habitat selection. Maladaptive selection for poor-quality habitat may contribute to ongoing declines in longspur populations, but information on thick-billed longspur breeding ecology in crop fields is lacking. We hypothesized that crop fields may function as ecological traps; specifically, we expected that crop fields may provide cues for territory selection, but frequent human disturbance would result in reduced reproduction. To address this hypothesis, we compared measures of habitat selection (settlement patterns and trends in abundance) and productivity (nest density, nest survival, and number of young fledged) between crop fields and native grassland sites during 2020-2021. Across both years, settlement patterns were similar between site types and occupancy ranged from 0.52 ± 0.17 SE to 0.99 ± 0.01 on April 7 and 30, respectively. Early season abundance differed by year, and changes in abundance during the breeding season appeared to be associated with precipitation-driven vegetation conditions rather than habitat type. While an index of nest density was lower in crop than native sites, the number of young fledged per successful nest (2.9 ± 0.18 SE) and nest survival (0.24 ± 0.03 SE; n = 222 nests) were similar for crop and native sites. Collectively, the data did not support our ecological trap hypothesis: longspurs did not exhibit a clear preference for crop sites and reproductive output was not significantly reduced. Our results indicate that croplands may provide alternative breeding habitat within a human-dominated landscape.

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Grassland bird surveys in north Valley County, Montana : 2001-2006 /

Cited by 2 publications

References 46 publications

Surveys for grassland birds of the Malta Field Office-BLM, including a seven-year study in north Valley County /

Surveys for grassland birds of the Malta Field Office-BLM, including a seven-year study in north Valley County /

Detecting ecological traps in human‐altered landscapes: A case study of the thick‐billed longspur nesting in croplands

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