Breeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 2018

Leach's Storm-Petrels (Hydrobates leucorhous) are burrow-nesting seabirds that breed on coastal islands throughout much of the North Atlantic, with most of the world's population breeding in Atlantic Canada. Population declines in the past 20-30 years have resulted in the species being upl...

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Autores principales:	Kyle J. N. d'Entremont, Laura Minich Zitske, Alison J. Gladwell, Nathan K. Elliott, Robert A. Mauck, Robert A. Ronconi
Formato:	article
Lenguaje:	EN
Publicado:	Resilience Alliance 2020
Materias:	census habitat kent island leach&#8217 s storm-petrel nest site use population change predation Plant culture SB1-1110 Environmental sciences GE1-350 Plant ecology QK900-989
Acceso en línea:	https://doaj.org/article/9da201ab1f3340beb203906eee6a7be7
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spelling	oai:doaj.org-article:9da201ab1f3340beb203906eee6a7be72021-12-02T11:34:35ZBreeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 20181712-6568https://doaj.org/article/9da201ab1f3340beb203906eee6a7be72020-06-01T00:00:00Zhttp://www.ace-eco.org/vol15/iss1/art11/https://doaj.org/toc/1712-6568Leach's Storm-Petrels (Hydrobates leucorhous) are burrow-nesting seabirds that breed on coastal islands throughout much of the North Atlantic, with most of the world's population breeding in Atlantic Canada. Population declines in the past 20-30 years have resulted in the species being uplisted to "Vulnerable" on the International Union for the Conservation of Nature Red List of Threatened Species. One of the species' most well-studied colonies is on Kent Island, New Brunswick in the Bay of Fundy. To determine if this colony has faced declines over a similar timescale, census work was conducted in June and July of 2000/2001 and 2018. Forty-one east-west transects in 2000/2001 (516 plots) and 56 east to west transects in 2018 (678 plots) were established every 50 m along the length of the island, which were censused with 10 m² plots. Population estimates were calculated by extrapolating mean occupied burrow density over the area of suitable nesting habitat on the island. Additionally, habitat characteristics and predator presence were recorded within each plot, and classification and regression tree (CART) analysis was used to determine which environmental factors affected burrow densities and occupancy rate. The estimated number of breeding pairs for the entire island in 2018 was 21,643 (CI 16,942-26,343) and has declined at an annual rate of -1.79% (CI -3.28% to -0.25%) since 2000/2001 (29,416 CI 23,015-35,817 pairs), though population trends varied across the island with forested habitat experiencing a large decline and the open habitat experiencing a marginal increase. CART models revealed that occupied burrow densities were highest in areas dominated by ferns or shrub/bramble that had no signs of forest regrowth, and had low gull nesting densities. Our results suggest that Leach's Storm-Petrels are declining at the southern extent of their range at similar rates exhibited at northern colonies, especially in forested habitat where habitat change may be influencing nest-site use.Kyle J. N. d'EntremontLaura Minich ZitskeAlison J. GladwellNathan K. ElliottRobert A. MauckRobert A. RonconiResilience Alliancearticlecensushabitatkent islandleach&#8217s storm-petrelnest site usepopulation changepredationPlant cultureSB1-1110Environmental sciencesGE1-350Plant ecologyQK900-989ENAvian Conservation and Ecology, Vol 15, Iss 1, p 11 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	census habitat kent island leach&#8217 s storm-petrel nest site use population change predation Plant culture SB1-1110 Environmental sciences GE1-350 Plant ecology QK900-989
spellingShingle	census habitat kent island leach&#8217 s storm-petrel nest site use population change predation Plant culture SB1-1110 Environmental sciences GE1-350 Plant ecology QK900-989 Kyle J. N. d'Entremont Laura Minich Zitske Alison J. Gladwell Nathan K. Elliott Robert A. Mauck Robert A. Ronconi Breeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 2018
description	Leach's Storm-Petrels (Hydrobates leucorhous) are burrow-nesting seabirds that breed on coastal islands throughout much of the North Atlantic, with most of the world's population breeding in Atlantic Canada. Population declines in the past 20-30 years have resulted in the species being uplisted to "Vulnerable" on the International Union for the Conservation of Nature Red List of Threatened Species. One of the species' most well-studied colonies is on Kent Island, New Brunswick in the Bay of Fundy. To determine if this colony has faced declines over a similar timescale, census work was conducted in June and July of 2000/2001 and 2018. Forty-one east-west transects in 2000/2001 (516 plots) and 56 east to west transects in 2018 (678 plots) were established every 50 m along the length of the island, which were censused with 10 m² plots. Population estimates were calculated by extrapolating mean occupied burrow density over the area of suitable nesting habitat on the island. Additionally, habitat characteristics and predator presence were recorded within each plot, and classification and regression tree (CART) analysis was used to determine which environmental factors affected burrow densities and occupancy rate. The estimated number of breeding pairs for the entire island in 2018 was 21,643 (CI 16,942-26,343) and has declined at an annual rate of -1.79% (CI -3.28% to -0.25%) since 2000/2001 (29,416 CI 23,015-35,817 pairs), though population trends varied across the island with forested habitat experiencing a large decline and the open habitat experiencing a marginal increase. CART models revealed that occupied burrow densities were highest in areas dominated by ferns or shrub/bramble that had no signs of forest regrowth, and had low gull nesting densities. Our results suggest that Leach's Storm-Petrels are declining at the southern extent of their range at similar rates exhibited at northern colonies, especially in forested habitat where habitat change may be influencing nest-site use.
format	article
author	Kyle J. N. d'Entremont Laura Minich Zitske Alison J. Gladwell Nathan K. Elliott Robert A. Mauck Robert A. Ronconi
author_facet	Kyle J. N. d'Entremont Laura Minich Zitske Alison J. Gladwell Nathan K. Elliott Robert A. Mauck Robert A. Ronconi
author_sort	Kyle J. N. d'Entremont
title	Breeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 2018
title_short	Breeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 2018
title_full	Breeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 2018
title_fullStr	Breeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 2018
title_full_unstemmed	Breeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 2018
title_sort	breeding population decline and associations with nest site use of leach's storm-petrels on kent island, new brunswick from 2001 to 2018
publisher	Resilience Alliance
publishDate	2020
url	https://doaj.org/article/9da201ab1f3340beb203906eee6a7be7
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Breeding population decline and associations with nest site use of Leach's Storm-Petrels on Kent Island, New Brunswick from 2001 to 2018

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