Unsplash<\/a><\/figcaption><\/figure>\n\n\n\nHavainto ja analyysi:<\/p>\n\n\n\n
Isotoopit ovat alkuaineita, joilla on sama m\u00e4\u00e4r\u00e4 protoneja mutta eri m\u00e4\u00e4r\u00e4 neutroneita, jotka eiv\u00e4t hajoa ajan my\u00f6t\u00e4.<\/p>\n\n\n\n
Nyt n\u00e4m\u00e4 isotoopit on yhdistetty vaeltavien el\u00e4inten ravinnonl\u00e4hteen m\u00e4\u00e4ritt\u00e4miseen.<\/p>\n\n\n\n
Silm\u00e4munan linssien laminaattien sanotaan olevan runsaasti proteiineja sis\u00e4lt\u00e4vi\u00e4. N\u00e4ihin proteiineihin sitoutuu isotooppisia alkuaineita, jotka johtavat isotooppiseen allekirjoitukseen, jota voidaan arvioida stabiilien isotooppien analyysin avulla.<\/p>\n\n\n\n
Nuorta lohikalaa tutkittiin kolmessa eri isotooppisessa elinymp\u00e4rist\u00f6ss\u00e4, joissa oli erilainen ravintoverkko, kalan silm\u00e4munan arkistokudoksen kvantifioimiseksi.<\/p>\n\n\n\n
K\u00e4ytetyt stabiilit isotoopit olivat rikki 35, hiili 13 ja typpi 15 (34<\/sup>S, 13<\/sup>C,15<\/sup>N).<\/p>\n\n\n\nRikin isotooppi on hy\u00f6dyllinen ravinnonl\u00e4hteiden selvitt\u00e4misess\u00e4. Rannikolla vaeltavien kalojen hiili-13-isotooppi on runsas, joten sit\u00e4 k\u00e4ytet\u00e4\u00e4n vaelluksen m\u00e4\u00e4ritt\u00e4miseen.<\/p>\n\n\n\n
Typpi-isotooppia hy\u00f6dynnet\u00e4\u00e4n vaeltavien el\u00e4inten trofiatasojen hallinnassa.<\/p>\n\n\n\n
Vakaiden isotooppien analyysi perustuu \"olet mit\u00e4 sy\u00f6t\" -k\u00e4sitteeseen.<\/p>\n\n\n\n
T\u00e4m\u00e4n perusteella tutkijat tutkivat rikki-, hiili- ja typpi-isotooppien kaltaisia alkuaineita kolmessa eri elinymp\u00e4rist\u00f6ss\u00e4 kasvatettujen aikuisten lohikalojen kudoksissa.<\/p>\n\n\n\n
Heid\u00e4n tutkimuksessaan havaittiin, ett\u00e4 kausittaisella tulva-alueella kasvatetuilla kaloilla oli enemm\u00e4n linssikerroksia ja ett\u00e4 ne kasvoivat paljon nopeammin kuin joessa ja hautomossa kasvatetut kalat.<\/p>\n\n\n\n
Isotooppianalyysi osoitti my\u00f6s, ett\u00e4 kalojen hiili- ja rikkipitoisuudet olivat korkeat ohitustien riisipeltojen vuoksi.<\/p>\n\n\n\n
Silm\u00e4kalapallon proteiinien ja isotooppielementin sitoutumista k\u00e4ytettiin ravinnon sis\u00e4ll\u00f6n analysoimiseksi.<\/p>\n\n\n\n
T\u00e4m\u00e4n lis\u00e4ksi nuorten lohikalojen silm\u00e4munien linssiin oli kirjattu stabiili isotooppi, mik\u00e4 johti vertailuun aikuisten kalojen kanssa niiden elinymp\u00e4rist\u00f6n ja ravinnonl\u00e4hteen selvitt\u00e4miseksi.<\/p>\n\n\n\n
T\u00e4m\u00e4 vakaan isotooppianalyysin (SIA) ty\u00f6kalu on laajentanut erilaisten suojeluhankkeiden soveltamisalaa. Sit\u00e4 voitaisiin k\u00e4ytt\u00e4\u00e4 erilaisten vaeltavien el\u00e4inten elinymp\u00e4rist\u00f6jen erist\u00e4miseen, koska nykyiset ilmastonmuutokset ja my\u00f6s ihmisen toiminta vaikuttavat niihin suuresti.<\/p>\n\n\n\n
Jos haluat lis\u00e4tietoja heid\u00e4n tutkimuksestaan, tutustu alla olevaan viitteeseen.<\/p>\n\n\n\n
Miranda Bell-Tilcock, Carson A. Jeffres, Andrew L. Rypel, Ted R. Sommer, Jacob V. E. Katz, George Whitman, Rachel C. Johnson. Ruokavalion rekonstruoinnin edist\u00e4minen kalansilm\u00e4linsseiss\u00e4<\/strong>. Ekologian ja evoluution menetelm\u00e4t<\/em>, 2021; DOI: 10.1111\/2041-210X.13543.<\/a><\/p>\n\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"
Aivan oikein, kaikki vastaukset l\u00f6ytyv\u00e4t silmist\u00e4. Jopa silloin, kun on kyse kalojen historiasta. Kalifornian yliopiston tutkija Miranda Bell ja h\u00e4nen tiimins\u00e4 havainnollistivat kalojen silm\u00e4munien linssien k\u00e4ytt\u00f6\u00e4 kalojen ruokavalion ja vaelluksen muutosten ennustamisessa. Vesiel\u00e4inten vaellus on yleens\u00e4 alle [...]<\/p>","protected":false},"author":18,"featured_media":12903,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[959,28],"tags":[554],"yoast_head":"\n
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<\/a>