Components of productivity in black-legged kittiwakes, Rissa tridactyla: response to supplemental feeding
In contrast to the high productivity of black-legged kittiwakes in Britain, kittiwakes at many colonies in Alaska have failed chronically to reproduce since the mid 1970s. To determine if food is limiting productivity and, if so, at what stages of nesting food shortages are most severe, in 1996 and...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.595.5676 2023-05-15T18:07:11+02:00 Components of productivity in black-legged kittiwakes, Rissa tridactyla: response to supplemental feeding Verena A. Gill Scott A. Hatch The Pennsylvania State University CiteSeerX Archives 2002 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.5676 http://alaska.usgs.gov/science/biology/seabirds_foragefish/products/publications/Gill_and_Hatch_2002_Components_productivity_BLKI_response_to_supplemental_food_JAB.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.5676 http://alaska.usgs.gov/science/biology/seabirds_foragefish/products/publications/Gill_and_Hatch_2002_Components_productivity_BLKI_response_to_supplemental_food_JAB.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://alaska.usgs.gov/science/biology/seabirds_foragefish/products/publications/Gill_and_Hatch_2002_Components_productivity_BLKI_response_to_supplemental_food_JAB.pdf text 2002 ftciteseerx 2016-01-08T13:43:10Z In contrast to the high productivity of black-legged kittiwakes in Britain, kittiwakes at many colonies in Alaska have failed chronically to reproduce since the mid 1970s. To determine if food is limiting productivity and, if so, at what stages of nesting food shortages are most severe, in 1996 and 1997 we supplementally fed kittiwakes nesting on an abandoned building. The effects of feeding were stronger in 1997 than in 1996, possibly because naturally occurring prey were of poorer quality in 1997. Consump-tion of supplemental herring declined as egg laying approached then increased slowly during incubation and more rapidly after hatching. All of the six components of productivity we studied were improved by supplemental feeding to some degree. Supplemental food did not significantly alter laying success in either year, although fed pairs bred at slightly higher rates than unfed pairs in 1997, the poorer food year. In 1996 and 1997, extra food noticeably increased clutch size and hatching success, but significantly so only in 1997. Fledging success and productivity were substantially augmented by feeding in both years. Fed pairs fledged twice as many chicks per nest as did unfed pairs in 1996 and three times as many in 1997. Fed and unfed pairs lost Text rissa tridactyla Alaska Unknown |
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ftciteseerx |
language |
English |
description |
In contrast to the high productivity of black-legged kittiwakes in Britain, kittiwakes at many colonies in Alaska have failed chronically to reproduce since the mid 1970s. To determine if food is limiting productivity and, if so, at what stages of nesting food shortages are most severe, in 1996 and 1997 we supplementally fed kittiwakes nesting on an abandoned building. The effects of feeding were stronger in 1997 than in 1996, possibly because naturally occurring prey were of poorer quality in 1997. Consump-tion of supplemental herring declined as egg laying approached then increased slowly during incubation and more rapidly after hatching. All of the six components of productivity we studied were improved by supplemental feeding to some degree. Supplemental food did not significantly alter laying success in either year, although fed pairs bred at slightly higher rates than unfed pairs in 1997, the poorer food year. In 1996 and 1997, extra food noticeably increased clutch size and hatching success, but significantly so only in 1997. Fledging success and productivity were substantially augmented by feeding in both years. Fed pairs fledged twice as many chicks per nest as did unfed pairs in 1996 and three times as many in 1997. Fed and unfed pairs lost |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Verena A. Gill Scott A. Hatch |
spellingShingle |
Verena A. Gill Scott A. Hatch Components of productivity in black-legged kittiwakes, Rissa tridactyla: response to supplemental feeding |
author_facet |
Verena A. Gill Scott A. Hatch |
author_sort |
Verena A. Gill |
title |
Components of productivity in black-legged kittiwakes, Rissa tridactyla: response to supplemental feeding |
title_short |
Components of productivity in black-legged kittiwakes, Rissa tridactyla: response to supplemental feeding |
title_full |
Components of productivity in black-legged kittiwakes, Rissa tridactyla: response to supplemental feeding |
title_fullStr |
Components of productivity in black-legged kittiwakes, Rissa tridactyla: response to supplemental feeding |
title_full_unstemmed |
Components of productivity in black-legged kittiwakes, Rissa tridactyla: response to supplemental feeding |
title_sort |
components of productivity in black-legged kittiwakes, rissa tridactyla: response to supplemental feeding |
publishDate |
2002 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.5676 http://alaska.usgs.gov/science/biology/seabirds_foragefish/products/publications/Gill_and_Hatch_2002_Components_productivity_BLKI_response_to_supplemental_food_JAB.pdf |
genre |
rissa tridactyla Alaska |
genre_facet |
rissa tridactyla Alaska |
op_source |
http://alaska.usgs.gov/science/biology/seabirds_foragefish/products/publications/Gill_and_Hatch_2002_Components_productivity_BLKI_response_to_supplemental_food_JAB.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.5676 http://alaska.usgs.gov/science/biology/seabirds_foragefish/products/publications/Gill_and_Hatch_2002_Components_productivity_BLKI_response_to_supplemental_food_JAB.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766179140000546816 |