Unsplash<\/a><\/figcaption><\/figure>\n\n\n\nPozorovanie a anal\u00fdza:<\/p>\n\n\n\n
Izotopy s\u00fa prvky, ktor\u00e9 maj\u00fa rovnak\u00fd po\u010det prot\u00f3nov, ale in\u00fd po\u010det neutr\u00f3nov, ktor\u00e9 sa \u010dasom nerozpadaj\u00fa.<\/p>\n\n\n\n
V s\u00fa\u010dasnosti sa tieto izotopy prvkov sp\u00e1jaj\u00fa s ur\u010den\u00edm zdroja potravy migruj\u00facich zvierat.<\/p>\n\n\n\n
O lamel\u00e1ch o\u010dn\u00fdch \u0161o\u0161oviek sa hovor\u00ed, \u017ee s\u00fa bohat\u00e9 na bielkoviny. Na tieto bielkoviny sa via\u017eu izotopy prvkov, ktor\u00e9 ved\u00fa k izotopov\u00e9mu podpisu, ktor\u00fd mo\u017eno vyhodnoti\u0165 pomocou anal\u00fdzy stabiln\u00fdch izotopov.<\/p>\n\n\n\n
Mlad\u00e9 lososovit\u00e9 ryby sa sk\u00famali v troch r\u00f4znych izotopov\u00fdch biotopoch s r\u00f4znou potravinovou sie\u0165ou s cie\u013eom kvantifikova\u0165 arch\u00edvne tkanivo o\u010dnej bu\u013evy r\u00fdb.<\/p>\n\n\n\n
Ako stabiln\u00e9 izotopy sa pou\u017eili prvky s\u00edry 35, uhl\u00edka 13 a dus\u00edka 15 (34<\/sup>S, 13<\/sup>C,15<\/sup>N).<\/p>\n\n\n\nIzotop s\u00edry je u\u017eito\u010dn\u00fd pri spozn\u00e1van\u00ed zdrojov potravy. Ryby z pobre\u017enej migr\u00e1cie s\u00fa bohat\u00e9 na izotop uhl\u00edka 13, preto sa pou\u017e\u00edva na ur\u010denie migra\u010dn\u00e9ho pohybu.<\/p>\n\n\n\n
Izotop dus\u00edka sa vyu\u017e\u00edva pri ur\u010dovan\u00ed trofick\u00fdch \u00farovn\u00ed migruj\u00facich \u017eivo\u010d\u00edchov.<\/p>\n\n\n\n
Anal\u00fdza stabiln\u00fdch izotopov je formulovan\u00e1 na z\u00e1klade koncepcie \"ste to, \u010do jete\".<\/p>\n\n\n\n
Na z\u00e1klade toho vedci zis\u0165ovali izotopy prvkov, ako je s\u00edra, uhl\u00edk a dus\u00edk, v tkaniv\u00e1ch dospel\u00fdch lososovit\u00fdch r\u00fdb, ktor\u00e9 sa pestovali v troch r\u00f4znych biotopoch.<\/p>\n\n\n\n
Ich \u0161t\u00fadia viedla k zisteniu, \u017ee ryby pestovan\u00e9 v sez\u00f3nnej z\u00e1plavovej oblasti mali viac vrstiev \u0161o\u0161ovky a r\u00e1stli ove\u013ea r\u00fdchlej\u0161ie ako ryby pestovan\u00e9 v rieke a v liahni.<\/p>\n\n\n\n
Izotopov\u00e1 anal\u00fdza tie\u017e odhalila, \u017ee ryby maj\u00fa vysok\u00fd obsah uhl\u00edka a s\u00edry v d\u00f4sledku ry\u017eov\u00fdch pol\u00ed v obchvate.<\/p>\n\n\n\n
Na anal\u00fdzu obsahu stravy sa pou\u017eila v\u00e4zba bielkov\u00edn o\u010dnej rybej gule a izotopov\u00e9ho prvku.<\/p>\n\n\n\n
Okrem toho sa u mlad\u00fdch lososovit\u00fdch r\u00fdb zaznamenal stabiln\u00fd izotopov\u00fd prvok v o\u010dnej \u0161o\u0161ovke, \u010do viedlo k porovnaniu s dospel\u00fdmi rybami pre preh\u013ead ich biotopu a zdroja potravy.<\/p>\n\n\n\n
Tento n\u00e1stroj anal\u00fdzy stabiln\u00fdch izotopov (SIA) roz\u0161\u00edril mo\u017enosti r\u00f4znych ochran\u00e1rskych projektov. Mohol by sa pou\u017ei\u0165 na izol\u00e1ciu biotopov r\u00f4znych migruj\u00facich \u017eivo\u010d\u00edchov, preto\u017ee s\u00fa ve\u013emi ovplyvnen\u00e9 s\u00fa\u010dasn\u00fdmi klimatick\u00fdmi zmenami a tie\u017e \u013eudskou \u010dinnos\u0165ou.<\/p>\n\n\n\n
Ak sa chcete dozvedie\u0165 viac o ich v\u00fdskume, pozrite si odkaz uveden\u00fd ni\u017e\u0161ie.<\/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. Pokrok v rekon\u0161trukcii stravy v ryb\u00edch o\u010dn\u00fdch \u0161o\u0161ovk\u00e1ch<\/strong>. Met\u00f3dy v ekol\u00f3gii a evol\u00facii<\/em>, 2021; DOI: 10.1111\/2041-210X.13543<\/a><\/p>\n\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"
Presne tak, v\u0161etky odpovede sa skr\u00fdvaj\u00fa v o\u010diach. Dokonca aj ke\u010f ide o hist\u00f3riu r\u00fdb. Vedky\u0148a Miranda Bellov\u00e1 a jej t\u00edm z Kalifornskej univerzity ilustrovali vyu\u017eitie o\u010dn\u00fdch \u0161o\u0161oviek r\u00fdb na predpovedanie zmien v strave a migr\u00e1cii r\u00fdb. Migr\u00e1cia vodn\u00fdch \u017eivo\u010d\u00edchov je zvy\u010dajne pod [...]<\/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>