Type of Publication: | Journal article |
Publication status: | Published |
Author: | Tarlow, Elisa M.; Wikelski, Martin; Anderson, David J. |
Year of publication: | 2001 |
Published in: | Hormones and Behavior ; 40 (2001), 1. - pp. 14-20. - ISSN 0018-506X. - eISSN 1095-6867 |
Pubmed ID: | 11467880 |
DOI (citable link): | https://dx.doi.org/10.1006/hbeh.2001.1661 |
Summary: |
Nazca boobies (Sula granti) show unconditional obligate siblicide immediately after hatching, reducing the typical two-egg clutch size to one. We studied body mass changes and levels of testosterone (T), corticosterone (CORT), and progesterone (P) for A-chicks (dominant, first hatched), B-chicks (subordinate, second hatched), and singletons, during the first 7 days after hatching, when siblicide normally occurs. Mass increase with age was higher for A-chicks than for singletons and B-chicks. This exaggerated the existing developmental advantage of A- over B-chicks that is due to hatching asynchrony. In nests with two chicks, CORT titer was significantly higher in B-chicks than in A-chicks. During ontogenetic development, CORT decreased with age for A-chicks, but did not change for singletons. P showed qualitatively similar ontogenetic changes to CORT, remaining unchanged for A-chicks but increasing for singletons. Thus, both CORT and P levels were lower for A-chicks than for singletons, and both hormones varied inversely with body mass. Overall, T levels did not differ between different categories of chicks. However, one B-chick in the process of reversing the dominance relationship with its older, but weakened, sibling had significantly elevated T. We suggest that CORT and P are regulated to promote exaggerated mass gain in socially challenged A-chicks, facilitating siblicide. Whether T induces aggressiveness during short time intervals of intense sibling rivalry needs further attention.
|
Subject (DDC): | 570 Biosciences, Biology |
Keywords: | siblicide; challenge hypothesis; Nazca booby; Sula granti; testosterone; corticosterone; progesterone; Galápagos; seabird; hormones |
Files | Size | Format | View |
---|---|---|---|
There are no files associated with this item. |
TARLOW, Elisa M., Martin WIKELSKI, David J. ANDERSON, 2001. Hormonal Correlates of Siblicide in Galápagos Nazca Boobies. In: Hormones and Behavior. 40(1), pp. 14-20. ISSN 0018-506X. eISSN 1095-6867. Available under: doi: 10.1006/hbeh.2001.1661
@article{Tarlow2001-08Hormo-42527, title={Hormonal Correlates of Siblicide in Galápagos Nazca Boobies}, year={2001}, doi={10.1006/hbeh.2001.1661}, number={1}, volume={40}, issn={0018-506X}, journal={Hormones and Behavior}, pages={14--20}, author={Tarlow, Elisa M. and Wikelski, Martin and Anderson, David J.} }
<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/42527"> <dc:creator>Wikelski, Martin</dc:creator> <dc:language>eng</dc:language> <dc:contributor>Wikelski, Martin</dc:contributor> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dc:contributor>Anderson, David J.</dc:contributor> <dc:creator>Anderson, David J.</dc:creator> <dcterms:abstract xml:lang="eng">Nazca boobies (Sula granti) show unconditional obligate siblicide immediately after hatching, reducing the typical two-egg clutch size to one. We studied body mass changes and levels of testosterone (T), corticosterone (CORT), and progesterone (P) for A-chicks (dominant, first hatched), B-chicks (subordinate, second hatched), and singletons, during the first 7 days after hatching, when siblicide normally occurs. Mass increase with age was higher for A-chicks than for singletons and B-chicks. This exaggerated the existing developmental advantage of A- over B-chicks that is due to hatching asynchrony. In nests with two chicks, CORT titer was significantly higher in B-chicks than in A-chicks. During ontogenetic development, CORT decreased with age for A-chicks, but did not change for singletons. P showed qualitatively similar ontogenetic changes to CORT, remaining unchanged for A-chicks but increasing for singletons. Thus, both CORT and P levels were lower for A-chicks than for singletons, and both hormones varied inversely with body mass. Overall, T levels did not differ between different categories of chicks. However, one B-chick in the process of reversing the dominance relationship with its older, but weakened, sibling had significantly elevated T. We suggest that CORT and P are regulated to promote exaggerated mass gain in socially challenged A-chicks, facilitating siblicide. Whether T induces aggressiveness during short time intervals of intense sibling rivalry needs further attention.</dcterms:abstract> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2018-06-11T12:08:02Z</dc:date> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/28"/> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/28"/> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2018-06-11T12:08:02Z</dcterms:available> <dcterms:issued>2001-08</dcterms:issued> <dcterms:title>Hormonal Correlates of Siblicide in Galápagos Nazca Boobies</dcterms:title> <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/42527"/> <dc:contributor>Tarlow, Elisa M.</dc:contributor> <dc:creator>Tarlow, Elisa M.</dc:creator> </rdf:Description> </rdf:RDF>