Unsplash<\/a><\/figcaption><\/figure>\n\n\n\nPozorov\u00e1n\u00ed a anal\u00fdza:<\/p>\n\n\n\n
Izotopy jsou prvky, kter\u00e9 maj\u00ed stejn\u00fd po\u010det proton\u016f, ale jin\u00fd po\u010det neutron\u016f, kter\u00e9 se v pr\u016fb\u011bhu \u010dasu nerozpadaj\u00ed.<\/p>\n\n\n\n
Nyn\u00ed jsou tyto izotopy prvk\u016f spojov\u00e1ny s ur\u010den\u00edm zdroje potravy migruj\u00edc\u00edch zv\u00ed\u0159at.<\/p>\n\n\n\n
\u0158\u00edk\u00e1 se, \u017ee lamely o\u010dn\u00edch \u010do\u010dek jsou bohat\u00e9 na b\u00edlkoviny. Na tyto b\u00edlkoviny jsou v\u00e1z\u00e1ny izotopy prvk\u016f, kter\u00e9 vedou k izotopov\u00e9mu podpisu, kter\u00fd lze vyhodnotit pomoc\u00ed anal\u00fdzy stabiln\u00edch izotop\u016f.<\/p>\n\n\n\n
Ml\u00e1\u010fata lososovit\u00fdch ryb byla zkoum\u00e1na ve t\u0159ech r\u016fzn\u00fdch izotopov\u00fdch biotopech s r\u016fznou potravn\u00ed s\u00edt\u00ed, aby bylo mo\u017en\u00e9 kvantifikovat archivn\u00ed tk\u00e1\u0148 o\u010dn\u00ed bulvy ryb.<\/p>\n\n\n\n
Jako stabiln\u00ed izotopy byly pou\u017eity prvky s\u00edry 35, uhl\u00edku 13 a dus\u00edku 15 (34<\/sup>S, 13<\/sup>C,15<\/sup>N).<\/p>\n\n\n\nIzotop s\u00edry je u\u017eite\u010dn\u00fd pro pozn\u00e1n\u00ed zdroj\u016f potravy. Ryby z pob\u0159e\u017en\u00ed migrace jsou bohat\u00e9 na izotop uhl\u00edku 13, proto se pou\u017e\u00edv\u00e1 k ur\u010den\u00ed migra\u010dn\u00edho pohybu.<\/p>\n\n\n\n
Izotop dus\u00edku se vyu\u017e\u00edv\u00e1 p\u0159i ur\u010dov\u00e1n\u00ed trofick\u00fdch \u00farovn\u00ed u migruj\u00edc\u00edch \u017eivo\u010dich\u016f.<\/p>\n\n\n\n
Anal\u00fdza stabiln\u00edch izotop\u016f je zalo\u017eena na koncepci \"jste to, co j\u00edte\".<\/p>\n\n\n\n
Na z\u00e1klad\u011b toho v\u011bdci zji\u0161\u0165ovali izotopy prvk\u016f, jako je s\u00edra, uhl\u00edk a dus\u00edk, v tk\u00e1n\u00edch dosp\u011bl\u00fdch lososovit\u00fdch ryb, kter\u00e9 rostly ve t\u0159ech variant\u00e1ch prost\u0159ed\u00ed.<\/p>\n\n\n\n
Jejich studie vedla ke zji\u0161t\u011bn\u00ed, \u017ee ryby p\u011bstovan\u00e9 v sez\u00f3nn\u00ed z\u00e1plavov\u00e9 oblasti m\u011bly v\u00edce vrstev \u010do\u010dky a rostly mnohem rychleji ne\u017e ryby p\u011bstovan\u00e9 v \u0159ece a v l\u00edhn\u00edch.<\/p>\n\n\n\n
Tak\u00e9 izotopov\u00e1 anal\u00fdza uk\u00e1zala, \u017ee ryby maj\u00ed vysok\u00fd obsah uhl\u00edku a s\u00edry, co\u017e je zp\u016fsobeno r\u00fd\u017eov\u00fdmi poli v obchvatu.<\/p>\n\n\n\n
K anal\u00fdze obsahu stravy byla pou\u017eita vazba b\u00edlkovin ryb\u00edch kuli\u010dek a izotopov\u00e9ho prvku.<\/p>\n\n\n\n
Krom\u011b toho byl u mlad\u00fdch lososovit\u00fdch ryb zaznamen\u00e1n stabiln\u00ed izotopov\u00fd prvek v o\u010dn\u00ed \u010do\u010dce, co\u017e vedlo ke srovn\u00e1n\u00ed s dosp\u011bl\u00fdmi rybami pro p\u0159ehled o jejich stanovi\u0161ti a zdroji potravy.<\/p>\n\n\n\n
Tento n\u00e1stroj anal\u00fdzy stabiln\u00edch izotop\u016f (SIA) roz\u0161\u00ed\u0159il mo\u017enosti r\u016fzn\u00fdch projekt\u016f na ochranu p\u0159\u00edrody. Mohl by b\u00fdt vyu\u017eit k izolaci stanovi\u0161\u0165 r\u016fzn\u00fdch migruj\u00edc\u00edch \u017eivo\u010dich\u016f, proto\u017ee jsou velmi ovlivn\u011bna sou\u010dasn\u00fdmi klimatick\u00fdmi zm\u011bnami a tak\u00e9 lidskou \u010dinnost\u00ed.<\/p>\n\n\n\n
Chcete-li se o jejich v\u00fdzkumu dozv\u011bd\u011bt v\u00edce, pod\u00edvejte se na n\u00ed\u017ee uveden\u00fd odkaz.<\/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 rekonstrukci stravy u ryb\u00edch o\u010dn\u00edch \u010do\u010dek<\/strong>. Metody v ekologii a evoluci<\/em>, 2021; DOI: 10.1111\/2041-210X.13543<\/a><\/p>\n\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"
P\u0159esn\u011b tak, v\u0161echny odpov\u011bdi se skr\u00fdvaj\u00ed v o\u010d\u00edch. Dokonce i pokud jde o historii ryb. V\u011bdec Miranda Bell a jeho t\u00fdm z Kalifornsk\u00e9 univerzity n\u00e1zorn\u011b uk\u00e1zali vyu\u017eit\u00ed o\u010dn\u00edch \u010do\u010dek ryb k p\u0159edpov\u00edd\u00e1n\u00ed zm\u011bn v potrav\u011b a migraci ryb. Migrace vodn\u00edch \u017eivo\u010dich\u016f je obvykle 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>