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At-sea movement and migration of the nocturnal swallow-tailed gull (Creagrus furcatus)

At-sea movement and migration of the nocturnal swallow-tailed gull (Creagrus furcatus)

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CRUZ, Sebastian M., 2013. At-sea movement and migration of the nocturnal swallow-tailed gull (Creagrus furcatus)

@phdthesis{Cruz2013At-se-24978, title={At-sea movement and migration of the nocturnal swallow-tailed gull (Creagrus furcatus)}, year={2013}, author={Cruz, Sebastian M.}, address={Konstanz}, school={Universität Konstanz} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/24978"> <dc:language>eng</dc:language> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-10-29T12:06:37Z</dc:date> <dc:contributor>Cruz, Sebastian M.</dc:contributor> <dcterms:title>At-sea movement and migration of the nocturnal swallow-tailed gull (Creagrus furcatus)</dcterms:title> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103605204-4002607-1"/> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/24978"/> <dcterms:alternative>Bewegung und Migration auf hoher See der nachtaktiven Gabelschwanzmöwe (Creagrus furcatus)</dcterms:alternative> <dc:rights>deposit-license</dc:rights> <dcterms:abstract xml:lang="eng">Swallow-tailed gulls nest on Galapagos archipelago; they are separated in 46 colonies on 15 islands forming a meta-population of approximately 10,000 pairs. Despite their unusual ecological characteristics, such as, obligate nocturnal pelagic foraging and a sub-annual breeding cycle, swallow-tailed gulls are poorly studied among seabirds. Before this project no information on their at-sea distribution was available. The main goal of the study was to understand the spatiotemporal dynamics of swallow-tailed gulls in relation to oceanographic conditions, reproductive stage, location, and season. The spatial ecology of seabirds can be used to test ecological hypothesis, provide essential physical and biological information on marine habitats and vital data for conservation and management strategies. To this end we used cutting edge biotelemetry tools to track the foraging and dispersal movements of individual birds. I used GPS loggers to track the foraging trips of swallow-tailed gulls during the breeding. To discover the non-breeding movements and at-sea activity patterns we used GLS loggers equipped with immersion monitors. These technologies are proven tools in the study of seabird at-sea. The main results of my study are the following: (1) nighttime at-sea activity of breeding swallow-tailed gulls was clearly associated with changes in moon phase, water landings occurred mainly during darker periods of the lunar cycle, coinciding with the cycle of diel vertical migration; (2) swallow-tailed gulls are capable of maintaining a sub- annual breeding cycle of 9 months by migrating non-seasonally to the NW-Chilean upwelling area of the Humboldt current; (3) the foraging activity of swallow-tailed gulls is exclusively nocturnal during reproduction, additionally, foraging strategies appear to differ between colonies in relation to different oceanographic regimes. This study provides new information on a poorly studied species and insights into the ecology of tropical seabirds which have been historically understudied in comparison to temperate species.</dcterms:abstract> <dc:creator>Cruz, Sebastian M.</dc:creator> <dcterms:issued>2013</dcterms:issued> </rdf:Description> </rdf:RDF>

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

Dissertation_Cruz_flat.pdf 114

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