Unsplash<\/a><\/figcaption><\/figure>\n\n\n\nNov\u0113ro\u0161ana un anal\u012bze:<\/p>\n\n\n\n
Izotopi ir elementi, kuriem ir vien\u0101ds protonu skaits, bet at\u0161\u0137ir\u012bgs neitronu skaits, kas laika gait\u0101 nesadal\u0101s.<\/p>\n\n\n\n
Tagad \u0161ie izotopu elementi ir saist\u012bti ar migr\u0113jo\u0161o dz\u012bvnieku bar\u012bbas avota noteik\u0161anu.<\/p>\n\n\n\n
Acs \u0101bola l\u0113cas pl\u0113v\u012btes ir bag\u0101tas ar olbaltumviel\u0101m. \u0160ie prote\u012bni ir saist\u012bti ar izotopu elementiem, kas veido izotopu parakstu, ko var nov\u0113rt\u0113t, izmantojot stabil\u0101 izotopa anal\u012bzi.<\/p>\n\n\n\n
Lai kvantitat\u012bvi noteiktu zivju acs \u0101bola audu arh\u012bvu, la\u0161veid\u012bgo zivju mazu\u013ci tika p\u0113t\u012bti tr\u012bs da\u017e\u0101dos izotopu biotopos ar at\u0161\u0137ir\u012bgu bar\u012bbas t\u012bklu.<\/p>\n\n\n\n
Izmantotie stabilie izotopi bija s\u0113rs 35, ogleklis 13 un sl\u0101peklis 15 (34<\/sup>S, 13<\/sup>C,15<\/sup>N).<\/p>\n\n\n\nS\u0113ra izotops ir noder\u012bgs, lai uzzin\u0101tu uztura avotus. Piekrastes migr\u0101cijas ziv\u012bs ir daudz oglek\u013ca 13 izotopa, t\u0101p\u0113c to izmanto, lai noteiktu migr\u0101cijas kust\u012bbu.<\/p>\n\n\n\n
Sl\u0101pek\u013ca izotopu izmanto migr\u0113jo\u0161o dz\u012bvnieku trofisko l\u012bme\u0146u noteik\u0161an\u0101.<\/p>\n\n\n\n
Stabilo izotopu anal\u012bzes pamat\u0101 ir koncepcija \"tu esi tas, ko tu \u0113d\".<\/p>\n\n\n\n
Pamatojoties uz to, zin\u0101tnieki p\u0113t\u012bja t\u0101du elementu k\u0101 s\u0113ra, oglek\u013ca un sl\u0101pek\u013ca izotopu kl\u0101tb\u016btni pieaugu\u0161o la\u0161veid\u012bgo zivju audos, kas audz\u0113ti tr\u012bs da\u017e\u0101dos biotopos.<\/p>\n\n\n\n
P\u0113t\u012bjuma rezult\u0101t\u0101 tika konstat\u0113ts, ka sezon\u0101laj\u0101 palien\u0113 audz\u0113taj\u0101m ziv\u012bm bija vair\u0101k l\u0113cas sl\u0101\u0146u, k\u0101 ar\u012b t\u0101s auga daudz \u0101tr\u0101k nek\u0101 up\u0113 un inkubator\u0101 audz\u0113t\u0101s zivis.<\/p>\n\n\n\n
Izotopu anal\u012bze ar\u012b atkl\u0101ja, ka ziv\u012bm ir augsts oglek\u013ca un s\u0113ra saturs, ko izrais\u012bja apvedce\u013ca r\u012bsu lauki.<\/p>\n\n\n\n
Lai analiz\u0113tu bar\u012bbas devas saturu, tika izmantota zivju acu bumbu olbaltumvielu un izotopu elementu saist\u012b\u0161ana.<\/p>\n\n\n\n
Papildus tam la\u0161veid\u012bgo zivju mazu\u013ciem acs \u0101bola l\u0113c\u0101 tika re\u0123istr\u0113ts stabils izotopu elements, kas \u013c\u0101va veikt sal\u012bdzin\u0101jumu ar pieaugu\u0161\u0101m ziv\u012bm, lai ieg\u016btu p\u0101rskatu par to dz\u012bvotni un bar\u012bbas avotu.<\/p>\n\n\n\n
\u0160is stabilo izotopu anal\u012bzes (SIA) r\u012bks ir papla\u0161in\u0101jis da\u017e\u0101du saglab\u0101\u0161anas projektu darb\u012bbas jomu. To var izmantot, lai izdal\u012btu da\u017e\u0101du migr\u0113jo\u0161o dz\u012bvnieku dz\u012bvotnes, jo t\u0101s ir \u013coti ietekm\u0113tas pa\u0161reiz\u0113jo klimata p\u0101rmai\u0146u un ar\u012b cilv\u0113ka darb\u012bbas d\u0113\u013c.<\/p>\n\n\n\n
Lai uzzin\u0101tu vair\u0101k par vi\u0146u p\u0113t\u012bjumiem, skatiet t\u0101l\u0101k sniegto atsauci.<\/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. Uzlabota uztura rekonstrukcija zivju acu l\u0113c\u0101s<\/strong>. Metodes ekolo\u0123ij\u0101 un evol\u016bcij\u0101<\/em>, 2021; DOI: 10.1111\/2041-210X.13543<\/a><\/p>\n\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"
Tie\u0161i t\u0101, visas atbildes sl\u0113pjas ac\u012bs. Pat tad, kad runa ir par zivju v\u0113sturi. Kalifornijas Universit\u0101tes zin\u0101tniece Miranda Bell un vi\u0146as komanda ilustr\u0113ja zivju acu \u0101bola l\u0113cu izmanto\u0161anu, lai prognoz\u0113tu izmai\u0146as zivju uztur\u0101 un migr\u0101cij\u0101. Parasti \u016bdensdz\u012bvnieku migr\u0101cija notiek, ja [...]<\/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>