Th\u1ee7y ng\u00e2n, m\u1ed9t kim lo\u1ea1i n\u1eb7ng c\u1ef1c \u0111\u1ed9c, g\u00e2y ra m\u1ed1i \u0111e d\u1ecda \u0111\u00e1ng k\u1ec3 \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 sinh th\u00e1i bi\u1ec3n. D\u1ea1ng g\u00e2y h\u1ea1i nh\u1ea5t c\u1ee7a n\u00f3, methyl th\u1ee7y ng\u00e2n, t\u00edch t\u1ee5 trong c\u00e1c sinh v\u1eadt bi\u1ec3n, \u0111\u1eb7c bi\u1ec7t l\u00e0 nh\u1eefng lo\u00e0i \u1edf \u0111\u1ea7u chu\u1ed7i th\u1ee9c \u0103n. M\u1eb7c d\u00f9 c\u00f3 nh\u1eefng n\u1ed7 l\u1ef1c nh\u1eb1m gi\u1ea3m ph\u00e1t th\u1ea3i th\u1ee7y ng\u00e2n, nh\u01b0ng th\u1ee7y ng\u00e2n v\u1eabn ti\u1ebfp t\u1ee5c x\u00e2m nh\u1eadp v\u00e0o \u0111\u1ea1i d\u01b0\u01a1ng th\u00f4ng qua n\u01b0\u1edbc th\u1ea3i c\u00f4ng nghi\u1ec7p v\u00e0 c\u00e1c ngu\u1ed3n kh\u00e1c.<\/p>\n\n
Khi th\u1ee7y ng\u00e2n di chuy\u1ec3n l\u00ean chu\u1ed7i th\u1ee9c \u0103n, n\u00f3 tr\u1edf n\u00ean c\u00f4 \u0111\u1eb7c h\u01a1n \u1edf nh\u1eefng lo\u00e0i s\u0103n m\u1ed3i \u0111\u1ea7u b\u1ea3ng. Qu\u00e1 tr\u00ecnh n\u00e0y, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 s\u1ef1 t\u00edch t\u1ee5 sinh h\u1ecdc, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn h\u00e0m l\u01b0\u1ee3ng th\u1ee7y ng\u00e2n cao nguy hi\u1ec3m trong c\u00e1c lo\u00e0i \u0111\u1ed9ng v\u1eadt nh\u01b0 h\u1ea3i c\u1ea9u v\u00e0 s\u01b0 t\u1eed bi\u1ec3n. C\u00e1c lo\u00e0i n\u00e0y \u0111\u00f3ng vai tr\u00f2 l\u00e0 “lo\u00e0i c\u1ea3nh b\u00e1o”, cung c\u1ea5p nh\u1eefng hi\u1ec3u bi\u1ebft c\u00f3 gi\u00e1 tr\u1ecb v\u1ec1 s\u1ee9c kh\u1ecfe c\u1ee7a m\u00f4i tr\u01b0\u1eddng s\u1ed1ng c\u1ee7a ch\u00fang v\u00e0 nh\u1eefng m\u1ed1i \u0111e d\u1ecda ti\u1ec1m t\u00e0ng \u0111\u1ed1i v\u1edbi s\u1ee9c kh\u1ecfe con ng\u01b0\u1eddi.<\/p>\n\n
C\u00e1c nghi\u00ean c\u1ee9u g\u1ea7n \u0111\u00e2y \u0111\u00e3 x\u00e1c \u0111\u1ecbnh voi bi\u1ec3n voi l\u00e0 m\u1ed9t t\u00e1c nh\u00e2n ch\u00ednh g\u00e2y \u00f4 nhi\u1ec5m th\u1ee7y ng\u00e2n \u1edf v\u00f9ng n\u01b0\u1edbc ven bi\u1ec3n California. Trong qu\u00e1 tr\u00ecnh “l\u1ed9t x\u00e1c th\u1ea3m kh\u1ed1c” h\u00e0ng n\u0103m, nh\u1eefng lo\u00e0i \u0111\u1ed9ng v\u1eadt kh\u1ed5ng l\u1ed3 n\u00e0y l\u1ed9t b\u1ecf to\u00e0n b\u1ed9 l\u1edbp da v\u00e0 l\u00f4ng tr\u00ean c\u00f9ng, gi\u1ea3i ph\u00f3ng m\u1ed9t l\u01b0\u1ee3ng l\u1edbn v\u1eadt ch\u1ea5t sinh h\u1ecdc v\u00e0o n\u01b0\u1edbc. V\u1eadt ch\u1ea5t n\u00e0y ch\u1ee9a n\u1ed3ng \u0111\u1ed9 methyl th\u1ee7y ng\u00e2n cao, c\u00f3 li\u00ean quan \u0111\u1ebfn n\u1ed3ng \u0111\u1ed9 th\u1ee7y ng\u00e2n t\u0103ng cao \u1edf c\u00e1c v\u00f9ng n\u01b0\u1edbc xung quanh.<\/p>\n\n
M\u1ed9t nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 tr\u00ean T\u1ea1p ch\u00ed c\u1ee7a H\u1ed9i Ho\u00e0ng gia Anh B \u0111\u00e3 \u0111o l\u01b0\u1eddng n\u1ed3ng \u0111\u1ed9 th\u1ee7y ng\u00e2n trong v\u00f9ng n\u01b0\u1edbc xung quanh Khu b\u1ea3o t\u1ed3n ti\u1ec3u bang A\u00f1o Nuevo, m\u1ed9t b\u00e3i \u0111\u1ebb ch\u00ednh c\u1ee7a voi bi\u1ec3n voi \u1edf California. K\u1ebft qu\u1ea3 cho th\u1ea5y trong m\u00f9a l\u1ed9t x\u00e1c c\u1ee7a h\u1ea3i c\u1ea9u, n\u1ed3ng \u0111\u1ed9 th\u1ee7y ng\u00e2n cao g\u1ea5p 17 l\u1ea7n so v\u1edbi v\u00f9ng n\u01b0\u1edbc kh\u00f4ng c\u00f3 h\u1ea3i c\u1ea9u.<\/p>\n\n
Nh\u1eefng ph\u00e1t hi\u1ec7n c\u1ee7a nghi\u00ean c\u1ee9u nh\u1ea5n m\u1ea1nh t\u00e1c \u0111\u1ed9ng \u0111\u00e1ng k\u1ec3 c\u1ee7a qu\u00e1 tr\u00ecnh l\u1ed9t x\u00e1c c\u1ee7a voi bi\u1ec3n voi \u0111\u1ed1i v\u1edbi chu tr\u00ecnh th\u1ee7y ng\u00e2n trong h\u1ec7 sinh th\u00e1i bi\u1ec3n. L\u00e0 nh\u1eefng lo\u00e0i s\u0103n m\u1ed3i \u0111\u1ea7u b\u1ea3ng, h\u1ea3i c\u1ea9u t\u00edch t\u1ee5 n\u1ed3ng \u0111\u1ed9 th\u1ee7y ng\u00e2n cao, c\u00f3 th\u1ec3 g\u00e2y ra nh\u1eefng t\u00e1c \u0111\u1ed9ng b\u1ea5t l\u1ee3i \u0111\u1ebfn s\u1ee9c kh\u1ecfe v\u00e0 kh\u1ea3 n\u0103ng sinh s\u1ea3n c\u1ee7a ch\u00fang. H\u01a1n n\u1eefa, vi\u1ec7c gi\u1ea3i ph\u00f3ng th\u1ee7y ng\u00e2n trong qu\u00e1 tr\u00ecnh l\u1ed9t x\u00e1c g\u00e2y ra nguy c\u01a1 ti\u1ec1m \u1ea9n \u0111\u1ed1i v\u1edbi c\u00e1c sinh v\u1eadt bi\u1ec3n kh\u00e1c v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 \u0111\u1ed1i v\u1edbi con ng\u01b0\u1eddi ti\u00eau th\u1ee5 h\u1ea3i s\u1ea3n.<\/p>\n\n
Hi\u1ec3u \u0111\u01b0\u1ee3c vai tr\u00f2 c\u1ee7a voi bi\u1ec3n voi trong \u00f4 nhi\u1ec5m th\u1ee7y ng\u00e2n l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 ph\u00e1t tri\u1ec3n c\u00e1c chi\u1ebfn l\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u hi\u1ec7u qu\u1ea3. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111ang kh\u00e1m ph\u00e1 nhi\u1ec1u c\u00e1ch ti\u1ebfp c\u1eadn kh\u00e1c nhau, bao g\u1ed3m gi\u1ea3m ph\u00e1t th\u1ea3i th\u1ee7y ng\u00e2n trong c\u00f4ng nghi\u1ec7p, c\u1ea3i thi\u1ec7n x\u1eed l\u00fd n\u01b0\u1edbc th\u1ea3i v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c h\u1ea1n ch\u1ebf v\u1ec1 ch\u1ebf \u0111\u1ed9 \u0103n u\u1ed1ng \u0111\u1ed1i v\u1edbi con ng\u01b0\u1eddi.<\/p>\n\n
Theo d\u00f5i li\u00ean t\u1ee5c n\u1ed3ng \u0111\u1ed9 th\u1ee7y ng\u00e2n trong h\u1ec7 sinh th\u00e1i bi\u1ec3n l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 theo d\u00f5i hi\u1ec7u qu\u1ea3 c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p gi\u1ea3m thi\u1ec3u v\u00e0 \u0111\u00e1nh gi\u00e1 c\u00e1c r\u1ee7i ro ti\u1ec1m \u1ea9n \u0111\u1ed1i v\u1edbi s\u1ee9c kh\u1ecfe con ng\u01b0\u1eddi. S\u1ef1 h\u1ee3p t\u00e1c gi\u1eefa c\u00e1c nh\u00e0 khoa h\u1ecdc, nh\u00e0 ho\u1ea1ch \u0111\u1ecbnh ch\u00ednh s\u00e1ch v\u00e0 c\u00e1c b\u00ean li\u00ean quan l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 \u00f4 nhi\u1ec5m th\u1ee7y ng\u00e2n v\u00e0 b\u1ea3o v\u1ec7 s\u1ee9c kh\u1ecfe c\u1ee7a c\u00e1c \u0111\u1ea1i d\u01b0\u01a1ng v\u00e0 sinh v\u1eadt bi\u1ec3n.<\/p>","protected":false},"excerpt":{"rendered":"
Voi bi\u1ec3n voi: Ngu\u1ed3n g\u00e2y \u00f4 nhi\u1ec5m th\u1ee7y ng\u00e2n \u0111\u00e1ng ng\u1ea1c nhi\u00ean \u1edf v\u00f9ng n\u01b0\u1edbc ven bi\u1ec3n California Th\u1ee7y ng\u00e2n trong m\u00f4i tr\u01b0\u1eddng bi\u1ec3n Th\u1ee7y ng\u00e2n, m\u1ed9t kim lo\u1ea1i n\u1eb7ng…<\/p>\n","protected":false},"author":2,"featured_media":24485,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[23783,23785,23782,1886,18600,23784],"class_list":["post-18187","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-marine-biology","tag-biomagnification","tag-catastrophic-molt","tag-elephant-seals","tag-marine-ecosystems","tag-mercury-pollution","tag-sentinel-species"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/18187","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/comments?post=18187"}],"version-history":[{"count":2,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/18187\/revisions"}],"predecessor-version":[{"id":24486,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/18187\/revisions\/24486"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/media\/24485"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/media?parent=18187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/categories?post=18187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/tags?post=18187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}