Factors affecting Bobolink nest survival across grassland types

Grassland birds, including Bobolinks (Dolichonyx oryzivorus), have experienced steep population declines across their breeding range in North America. Because of these declines, Bobolinks were listed as threatened by the Ontario and Canadian governments. We assessed nest survival across land-cover t...

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Autores principales:	Monica A. Fromberger, Andrew J. Campomizzi, Zoé M. Lebrun-Southcott, Alice L. Pintaric, Nicole M. MacDonald, Erica Nol
Formato:	article
Lenguaje:	EN
Publicado:	Resilience Alliance 2020
Materias:	farmland birds grassland birds landscape ecology land sharing range management restored grassland rmark rotational grazing spatial scale species at risk Plant culture SB1-1110 Environmental sciences GE1-350 Plant ecology QK900-989
Acceso en línea:	https://doaj.org/article/a35189617b3b4a03adc4cc319b5087a9
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spelling	oai:doaj.org-article:a35189617b3b4a03adc4cc319b5087a92021-12-02T18:06:21ZFactors affecting Bobolink nest survival across grassland types1712-6568https://doaj.org/article/a35189617b3b4a03adc4cc319b5087a92020-12-01T00:00:00Zhttps://www.ace-eco.org/vol15/iss2/art13/https://doaj.org/toc/1712-6568Grassland birds, including Bobolinks (Dolichonyx oryzivorus), have experienced steep population declines across their breeding range in North America. Because of these declines, Bobolinks were listed as threatened by the Ontario and Canadian governments. We assessed nest survival across land-cover types and uses to identify pertinent factors important for conservation of this species-at-risk. We analyzed nest survival for 463 Bobolink nests monitored over 6 years from 3 regions across southern and eastern Ontario, Canada. We used RMark to analyze daily survival rate of nests by assessing 53 models that incorporated temporal, local, and landscape variables. Daily survival rate of Bobolink nests was strongly associated with cattle (Bos taurus) stocking rate (cattle-days/ha) and date. Daily survival rate decreased across the nesting season from 0.98 (CI 95% = 0.97-0.99) to 0.92 (CI 95% = 0.87-0.95). Stocking rate was the only important local variable and was negatively associated with daily survival rate, which decreased from 0.96 (CI 95% = 0.96-0.97) to 0.69 (CI 95% = 0.51-0.82) as stocking rate increased from 0 to 243 cattle-days/ha. Landscape variables, including region, percent forest, cropland, and grassland within 2, 5, and 10 km, were not in competitive models. Our results suggest that all field uses we studied have potential for conservation actions because daily survival rate of nests did not vary significantly across late-cut hayfields, fallow fields, restored grasslands, or pastures; however, stocking rate is important in pastures. In grazed pastures where Bobolink conservation is a priority, we recommend keeping stocking rates low (≤ 40 cattle-days/ha) when most Bobolink nests are active, e.g., 21 May (earliest date of incubation) through 30 June (one week after median date of fledging for first nesting attempts) in our study area.Monica A. FrombergerAndrew J. CampomizziZoé M. Lebrun-SouthcottAlice L. PintaricNicole M. MacDonaldErica NolResilience Alliancearticlefarmland birdsgrassland birdslandscape ecologyland sharingrange managementrestored grasslandrmarkrotational grazingspatial scalespecies at riskPlant cultureSB1-1110Environmental sciencesGE1-350Plant ecologyQK900-989ENAvian Conservation and Ecology, Vol 15, Iss 2, p 13 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	farmland birds grassland birds landscape ecology land sharing range management restored grassland rmark rotational grazing spatial scale species at risk Plant culture SB1-1110 Environmental sciences GE1-350 Plant ecology QK900-989
spellingShingle	farmland birds grassland birds landscape ecology land sharing range management restored grassland rmark rotational grazing spatial scale species at risk Plant culture SB1-1110 Environmental sciences GE1-350 Plant ecology QK900-989 Monica A. Fromberger Andrew J. Campomizzi Zoé M. Lebrun-Southcott Alice L. Pintaric Nicole M. MacDonald Erica Nol Factors affecting Bobolink nest survival across grassland types
description	Grassland birds, including Bobolinks (Dolichonyx oryzivorus), have experienced steep population declines across their breeding range in North America. Because of these declines, Bobolinks were listed as threatened by the Ontario and Canadian governments. We assessed nest survival across land-cover types and uses to identify pertinent factors important for conservation of this species-at-risk. We analyzed nest survival for 463 Bobolink nests monitored over 6 years from 3 regions across southern and eastern Ontario, Canada. We used RMark to analyze daily survival rate of nests by assessing 53 models that incorporated temporal, local, and landscape variables. Daily survival rate of Bobolink nests was strongly associated with cattle (Bos taurus) stocking rate (cattle-days/ha) and date. Daily survival rate decreased across the nesting season from 0.98 (CI 95% = 0.97-0.99) to 0.92 (CI 95% = 0.87-0.95). Stocking rate was the only important local variable and was negatively associated with daily survival rate, which decreased from 0.96 (CI 95% = 0.96-0.97) to 0.69 (CI 95% = 0.51-0.82) as stocking rate increased from 0 to 243 cattle-days/ha. Landscape variables, including region, percent forest, cropland, and grassland within 2, 5, and 10 km, were not in competitive models. Our results suggest that all field uses we studied have potential for conservation actions because daily survival rate of nests did not vary significantly across late-cut hayfields, fallow fields, restored grasslands, or pastures; however, stocking rate is important in pastures. In grazed pastures where Bobolink conservation is a priority, we recommend keeping stocking rates low (≤ 40 cattle-days/ha) when most Bobolink nests are active, e.g., 21 May (earliest date of incubation) through 30 June (one week after median date of fledging for first nesting attempts) in our study area.
format	article
author	Monica A. Fromberger Andrew J. Campomizzi Zoé M. Lebrun-Southcott Alice L. Pintaric Nicole M. MacDonald Erica Nol
author_facet	Monica A. Fromberger Andrew J. Campomizzi Zoé M. Lebrun-Southcott Alice L. Pintaric Nicole M. MacDonald Erica Nol
author_sort	Monica A. Fromberger
title	Factors affecting Bobolink nest survival across grassland types
title_short	Factors affecting Bobolink nest survival across grassland types
title_full	Factors affecting Bobolink nest survival across grassland types
title_fullStr	Factors affecting Bobolink nest survival across grassland types
title_full_unstemmed	Factors affecting Bobolink nest survival across grassland types
title_sort	factors affecting bobolink nest survival across grassland types
publisher	Resilience Alliance
publishDate	2020
url	https://doaj.org/article/a35189617b3b4a03adc4cc319b5087a9
work_keys_str_mv	AT monicaafromberger factorsaffectingbobolinknestsurvivalacrossgrasslandtypes AT andrewjcampomizzi factorsaffectingbobolinknestsurvivalacrossgrasslandtypes AT zoemlebrunsouthcott factorsaffectingbobolinknestsurvivalacrossgrasslandtypes AT alicelpintaric factorsaffectingbobolinknestsurvivalacrossgrasslandtypes AT nicolemmacdonald factorsaffectingbobolinknestsurvivalacrossgrasslandtypes AT ericanol factorsaffectingbobolinknestsurvivalacrossgrasslandtypes
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Factors affecting Bobolink nest survival across grassland types

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