Sibling competition in common tern Sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms
In avian young that are dependent on parental food provisioning, brood size and corresponding sibling competition are key environmental factors affecting present performance, future developmental trajectories, and ultimately fitness. I studied the effect of sibling competition on chick condition and...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Master Thesis |
Language: | English |
Published: |
2008
|
Subjects: | |
Online Access: | https://doi.org/10.22032/dbt.14078 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20090730-0200004 https://www.db-thueringen.de/receive/dbt_mods_00014078 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00018581/Luis_Schmidt-Diplomarbeit.pdf http://uri.gbv.de/document/gvk:ppn:166454884X |
id |
ftdbthueringen:oai:www.db-thueringen.de:dbt_mods_00014078 |
---|---|
record_format |
openpolar |
spelling |
ftdbthueringen:oai:www.db-thueringen.de:dbt_mods_00014078 2024-04-07T07:51:53+00:00 Sibling competition in common tern Sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms Schmidt, Luis Halle, Stefan Becker, Peter H. Peter, Hans-Ulrich 2008 70 Seiten https://doi.org/10.22032/dbt.14078 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20090730-0200004 https://www.db-thueringen.de/receive/dbt_mods_00014078 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00018581/Luis_Schmidt-Diplomarbeit.pdf http://uri.gbv.de/document/gvk:ppn:166454884X eng eng https://doi.org/10.22032/dbt.14078 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20090730-0200004 https://www.db-thueringen.de/receive/dbt_mods_00014078 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00018581/Luis_Schmidt-Diplomarbeit.pdf http://uri.gbv.de/document/gvk:ppn:166454884X all rights reserved info:eu-repo/semantics/openAccess thesis Diplomarbeit Klasse B ddc:590 Flussseeschwalbe -- Hormonstoffwechsel -- Konkurrenz diploma_thesis Text doc-type:MasterThesis 2008 ftdbthueringen https://doi.org/10.22032/dbt.14078 2024-03-08T13:32:16Z In avian young that are dependent on parental food provisioning, brood size and corresponding sibling competition are key environmental factors affecting present performance, future developmental trajectories, and ultimately fitness. I studied the effect of sibling competition on chick condition and possibly underlying behavioural and hormonal patterns and mechanisms in the common tern Sterna hirundo, a semiprecocial bird species exhibiting hatching asynchrony, slight sexual size dimorphism, and profound effects of chicks' mass growth on their fitness. First, I conducted an observational study on sex-, hatching rank-, and brood size-specific patterns in chick condition, success in competitive behaviour, and testosterone (T) and corticosterone (CORT) levels; second, to investigate the effect of sibling competition on chick condition, feeding rates, and T and CORT levels, I experimentally varied the extent of within-brood competition by a one-day removal of the senior siblings from two-chick broods. Overall, the results show that sibling competition imposes limits on chick condition, at least in junior chicks, and underline the role of elevated CORT levels as a response to connected energetic stress. T seems to especially play a role for female senior chicks as a means to impose their dominance in the brood hierarchy in spite of a hardly superior physique, but the proposed general link between sibling competition and endogenous T does not hold in common terns. Hatching rank- and sex-related condition patterns do not appear to be governed by baseline endogenous steroid hormones, but could instead be influenced by short-term level elevations or maternal yolk steroids. Master Thesis Common tern Flussseeschwalbe Sterna hirundo Digital Library Thüringen |
institution |
Open Polar |
collection |
Digital Library Thüringen |
op_collection_id |
ftdbthueringen |
language |
English |
topic |
thesis Diplomarbeit Klasse B ddc:590 Flussseeschwalbe -- Hormonstoffwechsel -- Konkurrenz |
spellingShingle |
thesis Diplomarbeit Klasse B ddc:590 Flussseeschwalbe -- Hormonstoffwechsel -- Konkurrenz Schmidt, Luis Sibling competition in common tern Sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms |
topic_facet |
thesis Diplomarbeit Klasse B ddc:590 Flussseeschwalbe -- Hormonstoffwechsel -- Konkurrenz |
description |
In avian young that are dependent on parental food provisioning, brood size and corresponding sibling competition are key environmental factors affecting present performance, future developmental trajectories, and ultimately fitness. I studied the effect of sibling competition on chick condition and possibly underlying behavioural and hormonal patterns and mechanisms in the common tern Sterna hirundo, a semiprecocial bird species exhibiting hatching asynchrony, slight sexual size dimorphism, and profound effects of chicks' mass growth on their fitness. First, I conducted an observational study on sex-, hatching rank-, and brood size-specific patterns in chick condition, success in competitive behaviour, and testosterone (T) and corticosterone (CORT) levels; second, to investigate the effect of sibling competition on chick condition, feeding rates, and T and CORT levels, I experimentally varied the extent of within-brood competition by a one-day removal of the senior siblings from two-chick broods. Overall, the results show that sibling competition imposes limits on chick condition, at least in junior chicks, and underline the role of elevated CORT levels as a response to connected energetic stress. T seems to especially play a role for female senior chicks as a means to impose their dominance in the brood hierarchy in spite of a hardly superior physique, but the proposed general link between sibling competition and endogenous T does not hold in common terns. Hatching rank- and sex-related condition patterns do not appear to be governed by baseline endogenous steroid hormones, but could instead be influenced by short-term level elevations or maternal yolk steroids. |
author2 |
Halle, Stefan Becker, Peter H. Peter, Hans-Ulrich |
format |
Master Thesis |
author |
Schmidt, Luis |
author_facet |
Schmidt, Luis |
author_sort |
Schmidt, Luis |
title |
Sibling competition in common tern Sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms |
title_short |
Sibling competition in common tern Sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms |
title_full |
Sibling competition in common tern Sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms |
title_fullStr |
Sibling competition in common tern Sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms |
title_full_unstemmed |
Sibling competition in common tern Sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms |
title_sort |
sibling competition in common tern sterna hirundo chicks: underlying hormonal and behavioural patterns and mechanisms |
publishDate |
2008 |
url |
https://doi.org/10.22032/dbt.14078 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20090730-0200004 https://www.db-thueringen.de/receive/dbt_mods_00014078 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00018581/Luis_Schmidt-Diplomarbeit.pdf http://uri.gbv.de/document/gvk:ppn:166454884X |
genre |
Common tern Flussseeschwalbe Sterna hirundo |
genre_facet |
Common tern Flussseeschwalbe Sterna hirundo |
op_relation |
https://doi.org/10.22032/dbt.14078 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20090730-0200004 https://www.db-thueringen.de/receive/dbt_mods_00014078 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00018581/Luis_Schmidt-Diplomarbeit.pdf http://uri.gbv.de/document/gvk:ppn:166454884X |
op_rights |
all rights reserved info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.22032/dbt.14078 |
_version_ |
1795666996997652480 |