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[{"key": "dc.contributor.advisor", "value": "Thorogood, Rose", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Nokelainen, Ossi", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Jolkkonen, Juho", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2022-03-21T05:55:53Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2022-03-21T05:55:53Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2021", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/80240", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Lintujen munien v\u00e4rityksen yhten\u00e4 t\u00e4rkeimp\u00e4n\u00e4 syyn\u00e4 pidet\u00e4\u00e4n pedoilta suojautumista. Pes\u00e4materiaalin, -paikan sek\u00e4 valoymp\u00e4rist\u00f6n vaihdellessa munat, jotka sulautuvat hyvin pes\u00e4n visuaaliseen ymp\u00e4rist\u00f6\u00f6n, j\u00e4\u00e4v\u00e4t saalistajilta helpommin huomaamatta. Lajien v\u00e4listen erojen lis\u00e4ksi munien v\u00e4ritys vaihtelee my\u00f6s lajinsis\u00e4isesti eri yksil\u00f6iden v\u00e4lill\u00e4, mink\u00e4 syit\u00e4 ei tarkkaan tiedet\u00e4. Tutkimuksessani mittasin rytikerttusten (Acrocephalus scirpaceus) munien v\u00e4rityksen, pes\u00e4korkeuden sek\u00e4 pesim\u00e4ajankohdan vaihtelua Suomessa, lajin levinneisyysalueen pohjoisreunalla, selvitt\u00e4\u00e4kseni hy\u00f6dynt\u00e4v\u00e4tk\u00f6 naaraat pesim\u00e4habitaatin valoymp\u00e4rist\u00f6n vaihtelua muniensa suojav\u00e4rityksen parantamiseksi. Rytikerttusten pesim\u00e4habitaattinaan suosima ruovikko on usein rakenteeltaan homogeeninen, mutta kasvaa kes\u00e4n aikana nopeasti. Ruovikon nopean kasvun vuoksi oletin, ett\u00e4 ruovikon valoymp\u00e4rist\u00f6 muuttuisi pesim\u00e4kauden aikana tummemmaksi, ruskeas\u00e4vyisemm\u00e4ksi sek\u00e4 v\u00e4hemm\u00e4n laikukkaaksi (ts. tasaisemman varjoisaksi). Lis\u00e4ksi l\u00e4hemp\u00e4n\u00e4 maanpintaa, valoymp\u00e4rist\u00f6n tulisi olla tummempi, ruskeas\u00e4vyisempi sek\u00e4 v\u00e4hemm\u00e4n laikukas verrattuna ruovikon yl\u00e4osiin, korsien ja lehtien est\u00e4ess\u00e4 valon kulkeutumista ruovikon pohjalle saakka. Oletin, ett\u00e4 mik\u00e4li naaraat parantavat muniensa suojav\u00e4rityst\u00e4 habitaatin sis\u00e4ll\u00e4 vaihtelevassa valoymp\u00e4rist\u00f6ss\u00e4, my\u00f6hemmin pesim\u00e4kaudella sek\u00e4 matalammalla sijaitsevissa pesiss\u00e4 olevien munien tulisi olla tummempia, ruskeampia sek\u00e4 v\u00e4h\u00e4kontrastisemmin kuvioituja kuin kauden alussa tai korkeammalle rakennettuihin pesiin munittujen munien. Tulokseni osoittavat, ett\u00e4 rytikerttuset munivat tummempia, ruskeampia ja v\u00e4h\u00e4kontrastisempia munia my\u00f6hemmin pesim\u00e4kaudella, sek\u00e4 mukauttavat pes\u00e4korkeuttaan niin, ett\u00e4 munien ja valoymp\u00e4rist\u00f6n v\u00e4lill\u00e4 oli positiivinen korrelaatio kirkkaudessa ja laikukkuudessa. Yksil\u00f6llisesti vaihteleva munan v\u00e4ritys saattaa siis parantaa suojav\u00e4rityst\u00e4 vaihtelevassa valoymp\u00e4rist\u00f6ss\u00e4, ja rytikerttusnaaraat parantavat munien suojav\u00e4rityst\u00e4 valitsemalla sopivan pes\u00e4paikan valoymp\u00e4rist\u00f6\u00e4 apunaan k\u00e4ytt\u00e4en.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The wide diversity of egg colouration among bird species has fascinated biologists for centuries and it is now well known that camouflage from predators is a major cause of variation. As nests vary in material, location and light environment, eggs that are well camouflaged in their visual nest environment are more likely to avoid detection by predators. However, if predation is a major selective force, why is there a surprising amount of variation in egg colouration also within species? Here, I studied reed warblers (Acrocephalus scirpaceus) breeding in southern Finland to test whether females take advantage of microhabitat variation in the light environment to enhance camouflage of their eggs. Reed warblers breed in monotypic reeds that grow rapidly during the season, and females show variation in their egg phenotype, nest height, and timing of breeding. Because of reed growth, I predicted that there would be seasonal and vertical variation in the microhabitat light environment so that later in the season, and at a lower height, the light environment would be darker, longwave shifted (i.e., browner) and less dappled due to overlapping vegetation. Therefore, I predicted that females breeding later in the season should lay darker, browner and less contrastingly patterned eggs to better match the light environment. Additionally, or alternatively, females should build their nest at a height that best matches their egg colouration; darker, browner and less contrastingly patterned eggs should be more likely to occur in lower nests. As predicted, females laid darker, browner and less contrasting eggs later in the season and their egg phenotype positively correlated with the nest light environment in brightness and contrast, although not in brownness. My results suggest that phenotypic variation in luminance and patterning may enhance egg camouflage in visually varying microhabitats, and females promote this by choosing suitable nest sites, using the light environment as a cue. Plausibly matching respective light environments could drive the diversity of egg phenotypes by increased survival benefits in naturally heterogeneous environments.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2022-03-21T05:55:53Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2022-03-21T05:55:53Z (GMT). No. of bitstreams: 0\n Previous issue date: 2021", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "47", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "MICA", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "mikrohabitaatti", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "n\u00e4k\u00f6j\u00e4rjestelm\u00e4", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "valoymp\u00e4rist\u00f6", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Variation in reed warbler (Acrocephalus scirpaceus) egg phenotype with local breeding microhabitat", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202203211937", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Bio- ja ymp\u00e4rist\u00f6tieteiden laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Biological and Environmental Science", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Ekologia ja evoluutiobiologia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Ecology and evolutionary biology", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "restrictedAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4011", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "suojav\u00e4ri", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "protective coloration", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "The author has not given permission to make the work publicly available electronically. Therefore the material can be read only at the archival workstation at Jyv\u00e4skyl\u00e4 University Library (https://kirjasto.jyu.fi/collections/archival-workstation).", "language": "en", "element": "rights", "qualifier": "accessrights", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "Tekij\u00e4 ei ole antanut lupaa avoimeen julkaisuun, joten aineisto on luettavissa vain Jyv\u00e4skyl\u00e4n yliopiston kirjaston arkistoty\u00f6semalta. Ks. https://kirjasto.jyu.fi/kokoelmat/arkistotyoasema..", "language": "fi", "element": "rights", "qualifier": "accessrights", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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