Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious
The Sociable Lapwing Vanellus gregarius is a critically endangered species, probably declining from 5000 pairs to 500 pairs in 11 years. Fieldwork was conducted at two sites in Kazakhstan, May-August 2004, to identify causes of the species' decline. In total, 58 nests and a minimum of 36 broods...
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/bca29a9b-1896-45e1-acc7-f052729dcbd5 2024-06-23T07:57:23+00:00 Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious Watson, M Wilson, JM Koshkin, M Sherbakov, B Karpov, F Gavrilov, A Schielzeth, H Brombacher, M Collar, N Cresswell, Will 2006-07 https://research-portal.st-andrews.ac.uk/en/researchoutput/nest-survival-and-productivity-of-the-critically-endangered-sociable-lapwing-vanellus-gregarious(bca29a9b-1896-45e1-acc7-f052729dcbd5).html http://www.scopus.com/inward/record.url?scp=33745865573&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/nest-survival-and-productivity-of-the-critically-endangered-sociable-lapwing-vanellus-gregarious(bca29a9b-1896-45e1-acc7-f052729dcbd5).html info:eu-repo/semantics/restrictedAccess Watson , M , Wilson , JM , Koshkin , M , Sherbakov , B , Karpov , F , Gavrilov , A , Schielzeth , H , Brombacher , M , Collar , N & Cresswell , W 2006 , ' Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious ' , Ibis , vol. 148 , pp. 489-502 . ANTIPREDATOR BEHAVIOR MAYFIELD METHOD SUCCESS PREDATION FARMLAND NUMBERS WADERS RATES article 2006 ftunstandrewcris 2024-06-13T00:16:28Z The Sociable Lapwing Vanellus gregarius is a critically endangered species, probably declining from 5000 pairs to 500 pairs in 11 years. Fieldwork was conducted at two sites in Kazakhstan, May-August 2004, to identify causes of the species' decline. In total, 58 nests and a minimum of 36 broods in 16 colonies were found: colonies consisted of 1-8 nests that were on average 154 m apart, with 2.1 km between colonies. Although classified as biparental, the total proportion of time both parents spent incubating was low (77 +/- 2% se, n = 13 nests). Daily survival rates (Mayfield method) were very low during incubation (0.943 +/- 0.009 se) but high during the chick stage (0.986 +/- 0.004 se); incubation and chick-stage durations were found to be 28.5 and 29 days, respectively, so that the overall probability of any breeding attempt fledging chicks was 0.124 (0.055-0.274 95% confidence interval). A breeding attempt that produced fledglings, fledged 2.2 +/- 0.2 se chicks (n = 26) on average. Observed productivity predicted the population decline over the last 11 years well (using the maximum number of nesting attempts per pair of 1.4 that could have occurred in this study, and assuming an adult and first-year survival rate of 0.74 and 0.60, respectively, based on the means for Northern Lapwing Vanellus vanellus and Golden Plover Pluvialis apricalia). Nest survival during incubation (controlling for colony effects) may have been longer for nests in predominantly Artemisia rather than grass habitat. Mean nest survival for a colony was higher in areas with more bare ground and more nest predators, suggesting that predators were relatively unimportant in nest (egg or chick) mortality, but was lower in areas with high numbers of cattle, suggesting that trampling was important (64% of known-cause nest failures, n = 11, were trampled). Nests were preferentially sited in areas of Artemisia, where there was greater dung abundance, and probably shorter vegetation, suggesting that highly grazed vegetation is important for ... Article in Journal/Newspaper Vanellus vanellus University of St Andrews: Research Portal |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
ANTIPREDATOR BEHAVIOR MAYFIELD METHOD SUCCESS PREDATION FARMLAND NUMBERS WADERS RATES |
spellingShingle |
ANTIPREDATOR BEHAVIOR MAYFIELD METHOD SUCCESS PREDATION FARMLAND NUMBERS WADERS RATES Watson, M Wilson, JM Koshkin, M Sherbakov, B Karpov, F Gavrilov, A Schielzeth, H Brombacher, M Collar, N Cresswell, Will Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious |
topic_facet |
ANTIPREDATOR BEHAVIOR MAYFIELD METHOD SUCCESS PREDATION FARMLAND NUMBERS WADERS RATES |
description |
The Sociable Lapwing Vanellus gregarius is a critically endangered species, probably declining from 5000 pairs to 500 pairs in 11 years. Fieldwork was conducted at two sites in Kazakhstan, May-August 2004, to identify causes of the species' decline. In total, 58 nests and a minimum of 36 broods in 16 colonies were found: colonies consisted of 1-8 nests that were on average 154 m apart, with 2.1 km between colonies. Although classified as biparental, the total proportion of time both parents spent incubating was low (77 +/- 2% se, n = 13 nests). Daily survival rates (Mayfield method) were very low during incubation (0.943 +/- 0.009 se) but high during the chick stage (0.986 +/- 0.004 se); incubation and chick-stage durations were found to be 28.5 and 29 days, respectively, so that the overall probability of any breeding attempt fledging chicks was 0.124 (0.055-0.274 95% confidence interval). A breeding attempt that produced fledglings, fledged 2.2 +/- 0.2 se chicks (n = 26) on average. Observed productivity predicted the population decline over the last 11 years well (using the maximum number of nesting attempts per pair of 1.4 that could have occurred in this study, and assuming an adult and first-year survival rate of 0.74 and 0.60, respectively, based on the means for Northern Lapwing Vanellus vanellus and Golden Plover Pluvialis apricalia). Nest survival during incubation (controlling for colony effects) may have been longer for nests in predominantly Artemisia rather than grass habitat. Mean nest survival for a colony was higher in areas with more bare ground and more nest predators, suggesting that predators were relatively unimportant in nest (egg or chick) mortality, but was lower in areas with high numbers of cattle, suggesting that trampling was important (64% of known-cause nest failures, n = 11, were trampled). Nests were preferentially sited in areas of Artemisia, where there was greater dung abundance, and probably shorter vegetation, suggesting that highly grazed vegetation is important for ... |
format |
Article in Journal/Newspaper |
author |
Watson, M Wilson, JM Koshkin, M Sherbakov, B Karpov, F Gavrilov, A Schielzeth, H Brombacher, M Collar, N Cresswell, Will |
author_facet |
Watson, M Wilson, JM Koshkin, M Sherbakov, B Karpov, F Gavrilov, A Schielzeth, H Brombacher, M Collar, N Cresswell, Will |
author_sort |
Watson, M |
title |
Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious |
title_short |
Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious |
title_full |
Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious |
title_fullStr |
Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious |
title_full_unstemmed |
Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious |
title_sort |
nest survival and productivity of the critically endangered sociable lapwing vanellus gregarious |
publishDate |
2006 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/nest-survival-and-productivity-of-the-critically-endangered-sociable-lapwing-vanellus-gregarious(bca29a9b-1896-45e1-acc7-f052729dcbd5).html http://www.scopus.com/inward/record.url?scp=33745865573&partnerID=8YFLogxK |
genre |
Vanellus vanellus |
genre_facet |
Vanellus vanellus |
op_source |
Watson , M , Wilson , JM , Koshkin , M , Sherbakov , B , Karpov , F , Gavrilov , A , Schielzeth , H , Brombacher , M , Collar , N & Cresswell , W 2006 , ' Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarious ' , Ibis , vol. 148 , pp. 489-502 . |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/nest-survival-and-productivity-of-the-critically-endangered-sociable-lapwing-vanellus-gregarious(bca29a9b-1896-45e1-acc7-f052729dcbd5).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1802651006496931840 |