Unsplash<\/a><\/figcaption><\/figure>\n\n\n\nObservation och analys:<\/p>\n\n\n\n
Isotoper \u00e4r grund\u00e4mnen som har samma antal protoner men olika antal neutroner och som inte s\u00f6nderfaller med tiden.<\/p>\n\n\n\n
Nu har dessa isotopelement f\u00f6rknippats med fastst\u00e4llandet av f\u00f6dok\u00e4llan f\u00f6r migrerande djur.<\/p>\n\n\n\n
Lamellerna i \u00f6gats linser s\u00e4gs vara rika p\u00e5 proteiner. Dessa proteiner \u00e4r bundna av isotopelement som leder till en isotopsignatur som kan utv\u00e4rderas genom analys av stabila isotoper.<\/p>\n\n\n\n
Den unga laxfisken studerades i tre olika isotopiska livsmilj\u00f6er med olika f\u00f6dov\u00e4var f\u00f6r att kvantifiera arkivv\u00e4vnaden i fiskens \u00f6gonglob.<\/p>\n\n\n\n
De stabila isotopelement som anv\u00e4ndes var svavel 35, kol 13 och kv\u00e4ve 15 (34<\/sup>S, 13<\/sup>C,15<\/sup>N).<\/p>\n\n\n\nSvavelisotopen \u00e4r anv\u00e4ndbar f\u00f6r att ta reda p\u00e5 kostk\u00e4llor. Fisk fr\u00e5n kustvandring \u00e4r rik p\u00e5 kol-13-isotoper och anv\u00e4nds d\u00e4rf\u00f6r f\u00f6r att best\u00e4mma vandringsr\u00f6relsen.<\/p>\n\n\n\n
Kv\u00e4veisotopen anv\u00e4nds i styrningen av de trofiska niv\u00e5erna hos migrerande djur.<\/p>\n\n\n\n
Analysen av stabila isotoper \u00e4r formulerad p\u00e5 grundval av konceptet \"du \u00e4r vad du \u00e4ter\".<\/p>\n\n\n\n
P\u00e5 grundval av detta letade forskarna efter isotopelement som svavel, kol och kv\u00e4ve i v\u00e4vnaderna hos vuxna laxfiskar som odlats i tre olika livsmilj\u00f6er.<\/p>\n\n\n\n
Deras studie ledde till uppt\u00e4ckten att fiskar som odlats i s\u00e4songsbundna flodsl\u00e4tter hade fler lager av linsen och v\u00e4xte mycket snabbare \u00e4n de som odlats i floder och kl\u00e4ckerier.<\/p>\n\n\n\n
Isotopanalysen visade ocks\u00e5 att fiskarna hade ett h\u00f6gt inneh\u00e5ll av kol och svavel p\u00e5 grund av risf\u00e4lten i f\u00f6rbifarten.<\/p>\n\n\n\n
Bindningen mellan proteinerna i \u00f6gonfiskkulan och isotopelementet anv\u00e4ndes f\u00f6r att analysera dietinneh\u00e5llet.<\/p>\n\n\n\n
F\u00f6rutom detta hade den unga laxfisken ett stabilt isotopelement registrerat i sin \u00f6gonlins, vilket ledde till j\u00e4mf\u00f6relsen med den vuxna fisken f\u00f6r \u00f6versikten av dess livsmilj\u00f6 och n\u00e4ringsk\u00e4lla.<\/p>\n\n\n\n
Detta verktyg f\u00f6r analys av stabila isotoper (SIA) har breddat m\u00f6jligheterna f\u00f6r olika bevarandeprojekt. Det kan anv\u00e4ndas f\u00f6r att isolera livsmilj\u00f6er f\u00f6r olika migrerande djur eftersom de \u00e4r starkt p\u00e5verkade av de nuvarande klimatf\u00f6r\u00e4ndringarna och \u00e4ven av m\u00e4nskliga aktiviteter.<\/p>\n\n\n\n
Om du vill veta mer om deras forskning, kolla in referensen nedan.<\/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. F\u00f6rb\u00e4ttrad dietrekonstruktion i fisk\u00f6gonlinser<\/strong>. Metoder f\u00f6r ekologi och evolution<\/em>, 2021; DOI: 10.1111\/2041-210X.13543<\/a><\/p>\n\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"
Det st\u00e4mmer, alla svar finns i \u00f6gonen. \u00c4ven n\u00e4r det g\u00e4ller fiskarnas historia. Forskaren Miranda Bell och hans team fr\u00e5n University of California har illustrerat hur man kan anv\u00e4nda fisk\u00f6gonlinser f\u00f6r att f\u00f6ruts\u00e4ga f\u00f6r\u00e4ndringar i fiskars diet och migration. Vattenlevande djurs migration sker vanligtvis under [...]<\/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>