Energy intake of Common Guillemot, Uria aalge, chicks at Stora Karlsö, Sweden : influence of changes in the Baltic Sea
Observations of feeding behaviour of common guillemots, Uria aalge, in June 2002 at the island Stora Karlsö in the Baltic Sea proper, and measurements of morphology and energy density in the prey fish sprat, Sprattus sprattus, showed that fish delivered to chicks at present are shorter and weigh les...
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Högskolan på Gotland, Avdelningen för Biologi
2003
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ftuppsalauniv:oai:DiVA.org:hgo-216 2023-05-15T15:55:59+02:00 Energy intake of Common Guillemot, Uria aalge, chicks at Stora Karlsö, Sweden : influence of changes in the Baltic Sea Enekvist, Elisabeth 2003 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:hgo:diva-216 eng eng Högskolan på Gotland, Avdelningen för Biologi http://urn.kb.se/resolve?urn=urn:nbn:se:hgo:diva-216 info:eu-repo/semantics/openAccess commom guillemot sprat Baltic Sea energy intake decline sillgrissla skarpsill Östersjön energiintag minskning Gotland Biology Biologi Student thesis info:eu-repo/semantics/bachelorThesis text 2003 ftuppsalauniv 2023-02-23T21:43:50Z Observations of feeding behaviour of common guillemots, Uria aalge, in June 2002 at the island Stora Karlsö in the Baltic Sea proper, and measurements of morphology and energy density in the prey fish sprat, Sprattus sprattus, showed that fish delivered to chicks at present are shorter and weigh less than in the 1970s. Long lasting attending periods and a feeding rate of 4.6 feeds per day indicate that parents are feeding their chicks at a maximum rate. Because of a decline in the energy density in sprat (22.4 kJg-1 dry weight) the daily energy intake of common guillemot chicks have declined noticeably. This could probably explain the observed decrease in fledging body weight of chicks through the 1990s. Baltic common guillemots do not seem to be able to select more energy-dense prey sizes or to switch to other prey species. Bachelor Thesis common guillemot sillgrissla Uria aalge uria Uppsala University: Publications (DiVA) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
commom guillemot sprat Baltic Sea energy intake decline sillgrissla skarpsill Östersjön energiintag minskning Gotland Biology Biologi |
spellingShingle |
commom guillemot sprat Baltic Sea energy intake decline sillgrissla skarpsill Östersjön energiintag minskning Gotland Biology Biologi Enekvist, Elisabeth Energy intake of Common Guillemot, Uria aalge, chicks at Stora Karlsö, Sweden : influence of changes in the Baltic Sea |
topic_facet |
commom guillemot sprat Baltic Sea energy intake decline sillgrissla skarpsill Östersjön energiintag minskning Gotland Biology Biologi |
description |
Observations of feeding behaviour of common guillemots, Uria aalge, in June 2002 at the island Stora Karlsö in the Baltic Sea proper, and measurements of morphology and energy density in the prey fish sprat, Sprattus sprattus, showed that fish delivered to chicks at present are shorter and weigh less than in the 1970s. Long lasting attending periods and a feeding rate of 4.6 feeds per day indicate that parents are feeding their chicks at a maximum rate. Because of a decline in the energy density in sprat (22.4 kJg-1 dry weight) the daily energy intake of common guillemot chicks have declined noticeably. This could probably explain the observed decrease in fledging body weight of chicks through the 1990s. Baltic common guillemots do not seem to be able to select more energy-dense prey sizes or to switch to other prey species. |
format |
Bachelor Thesis |
author |
Enekvist, Elisabeth |
author_facet |
Enekvist, Elisabeth |
author_sort |
Enekvist, Elisabeth |
title |
Energy intake of Common Guillemot, Uria aalge, chicks at Stora Karlsö, Sweden : influence of changes in the Baltic Sea |
title_short |
Energy intake of Common Guillemot, Uria aalge, chicks at Stora Karlsö, Sweden : influence of changes in the Baltic Sea |
title_full |
Energy intake of Common Guillemot, Uria aalge, chicks at Stora Karlsö, Sweden : influence of changes in the Baltic Sea |
title_fullStr |
Energy intake of Common Guillemot, Uria aalge, chicks at Stora Karlsö, Sweden : influence of changes in the Baltic Sea |
title_full_unstemmed |
Energy intake of Common Guillemot, Uria aalge, chicks at Stora Karlsö, Sweden : influence of changes in the Baltic Sea |
title_sort |
energy intake of common guillemot, uria aalge, chicks at stora karlsö, sweden : influence of changes in the baltic sea |
publisher |
Högskolan på Gotland, Avdelningen för Biologi |
publishDate |
2003 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:hgo:diva-216 |
genre |
common guillemot sillgrissla Uria aalge uria |
genre_facet |
common guillemot sillgrissla Uria aalge uria |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:hgo:diva-216 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766391472608772096 |