Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius

Watson M, Wilson JM, Koshkin M, et al. Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius. Ibis . 2006;148(3):489-502. The Sociable Lapwing Vanellus gregarius is a critically endangered species, probably declining from 5000 pairs to 500 pairs in 11 years....

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Published in:Ibis
Main Authors: Watson, M., Wilson, J. M., Koshkin, M., Sherbakov, B., Karpov, F., Gavrilov, A., Schielzeth, Holger, Brombacher, M., Collar, N. J., Cresswell, W.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2006
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Online Access:https://pub.uni-bielefeld.de/record/2495970
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spelling ftubbiepub:oai:pub.uni-bielefeld.de:2495970 2023-05-15T18:42:36+02:00 Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius Watson, M. Wilson, J. M. Koshkin, M. Sherbakov, B. Karpov, F. Gavrilov, A. Schielzeth, Holger Brombacher, M. Collar, N. J. Cresswell, W. 2006 https://pub.uni-bielefeld.de/record/2495970 eng eng Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1474-919X.2006.00555.x info:eu-repo/semantics/altIdentifier/issn/0019-1019 info:eu-repo/semantics/altIdentifier/wos/000238887200010 https://pub.uni-bielefeld.de/record/2495970 info:eu-repo/semantics/closedAccess http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article doc-type:article text 2006 ftubbiepub https://doi.org/10.1111/j.1474-919X.2006.00555.x 2022-02-08T22:32:38Z Watson M, Wilson JM, Koshkin M, et al. Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius. Ibis . 2006;148(3):489-502. 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 nesting. Chicks preferentially selected areas with a lower percentage of bare ground and possibly taller vegetation, suggesting that more vegetated areas are important for chicks. The results suggest that low egg survival due to nesting in areas of high grazer density may be responsible for the Sociable Lapwing's decline. Although grazers may create suitable vegetation for initial nesting, if those grazers remain at high density as in anthropogenic systems then they may reduce nest survival, probably through trampling. Experimentally maintaining grazing early but reducing it later in the breeding season is the logical first step in managing the species to increase egg survival and so to increase productivity. Article in Journal/Newspaper Vanellus vanellus PUB - Publications at Bielefeld University Ibis 148 3 489 502
institution Open Polar
collection PUB - Publications at Bielefeld University
op_collection_id ftubbiepub
language English
description Watson M, Wilson JM, Koshkin M, et al. Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius. Ibis . 2006;148(3):489-502. 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 nesting. Chicks preferentially selected areas with a lower percentage of bare ground and possibly taller vegetation, suggesting that more vegetated areas are important for chicks. The results suggest that low egg survival due to nesting in areas of high grazer density may be responsible for the Sociable Lapwing's decline. Although grazers may create suitable vegetation for initial nesting, if those grazers remain at high density as in anthropogenic systems then they may reduce nest survival, probably through trampling. Experimentally maintaining grazing early but reducing it later in the breeding season is the logical first step in managing the species to increase egg survival and so to increase productivity.
format Article in Journal/Newspaper
author Watson, M.
Wilson, J. M.
Koshkin, M.
Sherbakov, B.
Karpov, F.
Gavrilov, A.
Schielzeth, Holger
Brombacher, M.
Collar, N. J.
Cresswell, W.
spellingShingle Watson, M.
Wilson, J. M.
Koshkin, M.
Sherbakov, B.
Karpov, F.
Gavrilov, A.
Schielzeth, Holger
Brombacher, M.
Collar, N. J.
Cresswell, W.
Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius
author_facet Watson, M.
Wilson, J. M.
Koshkin, M.
Sherbakov, B.
Karpov, F.
Gavrilov, A.
Schielzeth, Holger
Brombacher, M.
Collar, N. J.
Cresswell, W.
author_sort Watson, M.
title Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius
title_short Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius
title_full Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius
title_fullStr Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius
title_full_unstemmed Nest survival and productivity of the critically endangered Sociable Lapwing Vanellus gregarius
title_sort nest survival and productivity of the critically endangered sociable lapwing vanellus gregarius
publisher Wiley
publishDate 2006
url https://pub.uni-bielefeld.de/record/2495970
genre Vanellus vanellus
genre_facet Vanellus vanellus
op_relation info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1474-919X.2006.00555.x
info:eu-repo/semantics/altIdentifier/issn/0019-1019
info:eu-repo/semantics/altIdentifier/wos/000238887200010
https://pub.uni-bielefeld.de/record/2495970
op_rights info:eu-repo/semantics/closedAccess
op_doi https://doi.org/10.1111/j.1474-919X.2006.00555.x
container_title Ibis
container_volume 148
container_issue 3
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