Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland
1. Understanding drivers of population change is critical for effective species conservation. In the northeast Atlantic Ocean, recent changes amongst seabird communities are linked to human and climate change impacts on foodwebs. Many species have declined severely, with food shortages and increased...
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ftzenodo:oai:zenodo.org:4994992 2024-09-15T17:52:57+00:00 Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland Perkins, Allan Ratcliffe, Norman Suddaby, Dave Ribbands, Brian Smith, Claire Ellis, Pete Meek, Eric Bolton, Mark 2019-07-25 https://doi.org/10.5061/dryad.v056r5h unknown Zenodo https://doi.org/10.1111/1365-2656.12890 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.v056r5h oai:zenodo.org:4994992 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode sandeel Stercorarius skua Sterna paradisaea Uria aalge Fratercula arctica Stercorarius parasiticus marine conservation food availability Rissa tridactyla info:eu-repo/semantics/other 2019 ftzenodo https://doi.org/10.5061/dryad.v056r5h10.1111/1365-2656.12890 2024-07-26T11:00:59Z 1. Understanding drivers of population change is critical for effective species conservation. In the northeast Atlantic Ocean, recent changes amongst seabird communities are linked to human and climate change impacts on foodwebs. Many species have declined severely, with food shortages and increased predation reducing productivity. Arctic skua Stercorarius parasiticus, a kleptoparasite of other seabirds, is one such species. 2. The aim of the study was to determine relative effects of bottom-up and top-down pressures on Arctic skuas across multiple colonies in a rapidly declining national population. 3. Long-term monitoring data were used to quantify changes in population size and productivity of Arctic skuas, their hosts (black-legged kittiwake Rissa tridactyla, common guillemot Uria aalge, Atlantic puffin Fratercula arctica, Arctic tern Sterna paradisaea), and an apex predator (great skua Stercorarius skua) over 24 years (1992–2015) in Scotland. We used digital mapping and statistical models to determine relative effects of bottom-up (host productivity) and top-down (great skua density) pressures on Arctic skuas across 33 colonies, and assess variation between three colony types classified by host abundance. 4. Arctic skuas declined by 81% and their hosts by 42–92%, whereas at most colonies great skuas increased. Annual productivity declined in Arctic skuas and their hosts, and reduced Arctic skua breeding success was a driver of the species' population decline. Arctic skua productivity was positively associated with annual breeding success of hosts, and negatively with great skua density. Inter-colony variation suggested Arctic skua trends and productivity were most sensitive to top-down pressures at smaller colonies of host species where great skuas had increased most, whereas bottom-up pressures dominated at large colonies of host species. 5. Scotland's Arctic skua population is declining rapidly, with bottom-up and top-down pressures simultaneously reducing breeding success to unsustainably low levels. ... Other/Unknown Material Arctic Arctic skua Arctic tern Atlantic puffin Black-legged Kittiwake Climate change common guillemot fratercula Fratercula arctica Great skua Northeast Atlantic rissa tridactyla Stercorarius parasiticus Stercorarius skua Sterna paradisaea Uria aalge uria Zenodo |
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sandeel Stercorarius skua Sterna paradisaea Uria aalge Fratercula arctica Stercorarius parasiticus marine conservation food availability Rissa tridactyla |
spellingShingle |
sandeel Stercorarius skua Sterna paradisaea Uria aalge Fratercula arctica Stercorarius parasiticus marine conservation food availability Rissa tridactyla Perkins, Allan Ratcliffe, Norman Suddaby, Dave Ribbands, Brian Smith, Claire Ellis, Pete Meek, Eric Bolton, Mark Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland |
topic_facet |
sandeel Stercorarius skua Sterna paradisaea Uria aalge Fratercula arctica Stercorarius parasiticus marine conservation food availability Rissa tridactyla |
description |
1. Understanding drivers of population change is critical for effective species conservation. In the northeast Atlantic Ocean, recent changes amongst seabird communities are linked to human and climate change impacts on foodwebs. Many species have declined severely, with food shortages and increased predation reducing productivity. Arctic skua Stercorarius parasiticus, a kleptoparasite of other seabirds, is one such species. 2. The aim of the study was to determine relative effects of bottom-up and top-down pressures on Arctic skuas across multiple colonies in a rapidly declining national population. 3. Long-term monitoring data were used to quantify changes in population size and productivity of Arctic skuas, their hosts (black-legged kittiwake Rissa tridactyla, common guillemot Uria aalge, Atlantic puffin Fratercula arctica, Arctic tern Sterna paradisaea), and an apex predator (great skua Stercorarius skua) over 24 years (1992–2015) in Scotland. We used digital mapping and statistical models to determine relative effects of bottom-up (host productivity) and top-down (great skua density) pressures on Arctic skuas across 33 colonies, and assess variation between three colony types classified by host abundance. 4. Arctic skuas declined by 81% and their hosts by 42–92%, whereas at most colonies great skuas increased. Annual productivity declined in Arctic skuas and their hosts, and reduced Arctic skua breeding success was a driver of the species' population decline. Arctic skua productivity was positively associated with annual breeding success of hosts, and negatively with great skua density. Inter-colony variation suggested Arctic skua trends and productivity were most sensitive to top-down pressures at smaller colonies of host species where great skuas had increased most, whereas bottom-up pressures dominated at large colonies of host species. 5. Scotland's Arctic skua population is declining rapidly, with bottom-up and top-down pressures simultaneously reducing breeding success to unsustainably low levels. ... |
format |
Other/Unknown Material |
author |
Perkins, Allan Ratcliffe, Norman Suddaby, Dave Ribbands, Brian Smith, Claire Ellis, Pete Meek, Eric Bolton, Mark |
author_facet |
Perkins, Allan Ratcliffe, Norman Suddaby, Dave Ribbands, Brian Smith, Claire Ellis, Pete Meek, Eric Bolton, Mark |
author_sort |
Perkins, Allan |
title |
Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland |
title_short |
Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland |
title_full |
Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland |
title_fullStr |
Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland |
title_full_unstemmed |
Data from: Combined bottom-up and top-down pressures drive catastrophic population declines of Arctic skuas in Scotland |
title_sort |
data from: combined bottom-up and top-down pressures drive catastrophic population declines of arctic skuas in scotland |
publisher |
Zenodo |
publishDate |
2019 |
url |
https://doi.org/10.5061/dryad.v056r5h |
genre |
Arctic Arctic skua Arctic tern Atlantic puffin Black-legged Kittiwake Climate change common guillemot fratercula Fratercula arctica Great skua Northeast Atlantic rissa tridactyla Stercorarius parasiticus Stercorarius skua Sterna paradisaea Uria aalge uria |
genre_facet |
Arctic Arctic skua Arctic tern Atlantic puffin Black-legged Kittiwake Climate change common guillemot fratercula Fratercula arctica Great skua Northeast Atlantic rissa tridactyla Stercorarius parasiticus Stercorarius skua Sterna paradisaea Uria aalge uria |
op_relation |
https://doi.org/10.1111/1365-2656.12890 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.v056r5h oai:zenodo.org:4994992 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.v056r5h10.1111/1365-2656.12890 |
_version_ |
1810294970579419136 |