Trong quang c\u1ea3nh r\u1ed9ng l\u1edbn c\u1ee7a V\u01b0\u1eddn qu\u1ed1c gia Grand Teton \u1edf Wyoming, m\u1ed9t m\u1ed1i quan h\u1ec7 h\u1ea5p d\u1eabn gi\u1eefa linh d\u01b0\u01a1ng s\u1eebng nh\u00e1nh v\u00e0 s\u00f3i \u0111\u00e3 \u0111\u01b0\u1ee3c h\u00e9 l\u1ed9. M\u1ed9t nghi\u00ean c\u1ee9u c\u1ee7a Hi\u1ec7p h\u1ed9i B\u1ea3o t\u1ed3n \u0110\u1ed9ng v\u1eadt hoang d\u00e3 cho th\u1ea5y nh\u1eefng ch\u00fa nai con \u0111\u01b0\u1ee3c nu\u00f4i g\u1ea7n s\u00f3i c\u00f3 t\u1ef7 l\u1ec7 s\u1ed1ng s\u00f3t cao g\u1ea5p b\u1ed1n l\u1ea7n so v\u1edbi nh\u1eefng ch\u00fa nai con \u1edf nh\u1eefng khu v\u1ef1c kh\u00f4ng c\u00f3 s\u00f3i. Ph\u00e1t hi\u1ec7n \u0111\u00e1ng kinh ng\u1ea1c n\u00e0y cho th\u1ea5y r\u1eb1ng lo\u00e0i s\u00f3i \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c duy tr\u00ec qu\u1ea7n th\u1ec3 linh d\u01b0\u01a1ng s\u1eebng nh\u00e1nh b\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t s\u1ef1 s\u0103n m\u1ed3i c\u1ee7a lo\u00e0i s\u00f3i \u0111\u1ed3ng c\u1ecf.<\/p>\n\n
S\u00e2u trong l\u00f2ng \u0111\u1ea5t c\u1ee7a Mississippi, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 khai qu\u1eadt \u0111\u01b0\u1ee3c m\u1ed9t h\u00f3a th\u1ea1ch \u0111\u00e1ng ch\u00fa \u00fd, h\u00e9 l\u1ed9 ngu\u1ed3n g\u1ed1c c\u1ee7a c\u00e1c lo\u00e0i linh tr\u01b0\u1edfng \u1edf B\u1eafc M\u1ef9. Teilhardina magnoliana, m\u1ed9t lo\u00e0i linh tr\u01b0\u1edfng s\u1ed1ng tr\u00ean c\u00e2y ch\u1ec9 n\u1eb7ng m\u1ed9t ounce, \u0111\u00e3 lang thang tr\u00ean l\u1ee5c \u0111\u1ecba c\u00e1ch \u0111\u00e2y kho\u1ea3ng 55,8 tri\u1ec7u n\u0103m. Kh\u00e1m ph\u00e1 n\u00e0y, do K. Christopher Beard thu\u1ed9c B\u1ea3o t\u00e0ng L\u1ecbch s\u1eed T\u1ef1 nhi\u00ean Carnegie d\u1eabn \u0111\u1ea7u, \u1ee7ng h\u1ed9 cho gi\u1ea3 thuy\u1ebft r\u1eb1ng c\u00e1c lo\u00e0i linh tr\u01b0\u1edfng \u0111\u00e3 b\u0103ng qua c\u1ea7u \u0111\u1ea5t Bering t\u1eeb Ch\u00e2u \u00c1, m\u1edf \u0111\u01b0\u1eddng cho s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a con ng\u01b0\u1eddi sau n\u00e0y.<\/p>\n\n
Ngo\u00e0i kh\u01a1i b\u1edd bi\u1ec3n T\u00e2y B\u1eafc Th\u00e1i B\u00ecnh D\u01b0\u01a1ng, m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng \u0111\u00e1ng s\u1ee3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 “v\u00f9ng ch\u1ebft” tr\u00ean \u0111\u1ea1i d\u01b0\u01a1ng \u0111\u00e3 xu\u1ea5t hi\u1ec7n. Khu v\u1ef1c n\u01b0\u1edbc n\u00e0y c\u00f3 m\u1ee9c oxy c\u1ef1c k\u1ef3 th\u1ea5p, khi\u1ebfn c\u00e1c lo\u00e0i \u0111\u1ed9ng v\u1eadt bi\u1ec3n kh\u00f4ng th\u1ec3 tho\u00e1t kh\u1ecfi b\u1ecb ng\u1ea1t th\u1edf. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u1ee7a \u0110\u1ea1i h\u1ecdc bang Oregon \u0111\u00e3 ph\u00e2n t\u00edch nhi\u1ec1u th\u1eadp k\u1ef7 d\u1eef li\u1ec7u v\u00e0 k\u1ebft lu\u1eadn r\u1eb1ng v\u00f9ng ch\u1ebft g\u1ea7n \u0111\u00e2y n\u00e0y l\u00e0 do s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a gi\u00f3 v\u00e0 d\u00f2ng h\u1ea3i l\u01b0u ph\u00e1 v\u1ee1 h\u1ec7 sinh th\u00e1i v\u00e0 th\u00fac \u0111\u1ea9y s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a vi khu\u1ea9n l\u00e0m suy gi\u1ea3m oxy.<\/p>\n\n
T\u1ea1i th\u00e0nh ph\u1ed1 Montpellier nh\u1ed9n nh\u1ecbp \u1edf Ph\u00e1p, m\u1ed9t nghi\u00ean c\u1ee9u \u0111\u00e3 ti\u1ebft l\u1ed9 kh\u1ea3 n\u0103ng th\u00edch nghi \u0111\u00e1ng kinh ng\u1ea1c c\u1ee7a th\u1ef1c v\u1eadt v\u1edbi m\u00f4i tr\u01b0\u1eddng \u0111\u00f4 th\u1ecb. Crepis sancta, m\u1ed9t lo\u1ea1i c\u1ecf d\u1ea1i gi\u1ed1ng nh\u01b0 c\u00e2y b\u1ed3 c\u00f4ng anh, \u0111\u00e3 ti\u1ebfn h\u00f3a \u0111\u1ec3 t\u1ea1o ra c\u00e1c lo\u1ea1i h\u1ea1t kh\u00e1c nhau: m\u1ed9t s\u1ed1 h\u1ea1t theo gi\u00f3 v\u00e0 m\u1ed9t s\u1ed1 h\u1ea1t kh\u00e1c v\u1eabn \u1edf g\u1ea7n c\u00e2y m\u1eb9. Lo\u00e0i C. sancta \u1edf \u0111\u00f4 th\u1ecb \u0111\u00e3 th\u00edch nghi v\u1edbi m\u00f4i tr\u01b0\u1eddng xung quanh b\u1eb1ng c\u00e1ch t\u1ea1o ra nhi\u1ec1u h\u1ea1t h\u01a1n r\u01a1i xu\u1ed1ng \u0111\u1ea5t, t\u1eadn d\u1ee5ng l\u1ee3i th\u1ebf c\u1ee7a \u0111\u1ea5t gi\u00e0u ch\u1ea5t dinh d\u01b0\u1ee1ng h\u1ed7 tr\u1ee3 s\u1ef1 s\u1ed1ng s\u00f3t c\u1ee7a ch\u00fang gi\u1eefa b\u00ea t\u00f4ng v\u00e0 nh\u1ef1a \u0111\u01b0\u1eddng.<\/p>\n\n
B\u00ean d\u01b0\u1edbi l\u00e0n n\u01b0\u1edbc \u0111\u1ee5c ng\u1ea7u c\u1ee7a \u0111\u1ea7m l\u1ea7y v\u00e0 s\u00f4ng ng\u00f2i, c\u00e1 s\u1ea5u M\u1ef9 s\u1edf h\u1eefu h\u1ec7 h\u00f4 h\u1ea5p h\u1ea5p d\u1eabn cho ph\u00e9p ch\u00fang d\u1ec5 d\u00e0ng di chuy\u1ec3n. M\u1ed9t nghi\u00ean c\u1ee9u \u0111\u1ed9t ph\u00e1 c\u1ee7a c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u t\u1ea1i \u0110\u1ea1i h\u1ecdc Utah \u0111\u00e3 ghi l\u1ea1i m\u1ee5c \u0111\u00edch k\u00e9p c\u1ee7a c\u00e1c c\u01a1 gi\u00e3n n\u1edf v\u00e0 co b\u00f3p ph\u1ed5i c\u1ee7a c\u00e1 s\u1ea5u. Nh\u1eefng c\u01a1 n\u00e0y kh\u00f4ng ch\u1ec9 h\u1ed7 tr\u1ee3 h\u00f4 h\u1ea5p m\u00e0 c\u00f2n g\u00f3p ph\u1ea7n v\u00e0o c\u00e1c chuy\u1ec3n \u0111\u1ed9ng d\u01b0\u1edbi n\u01b0\u1edbc c\u1ee7a c\u00e1 s\u1ea5u. Khi c\u00e1 s\u1ea5u l\u1eb7n, c\u00e1c c\u01a1 s\u1ebd di chuy\u1ec3n ph\u1ed5i v\u1ec1 ph\u00eda \u0111u\u00f4i; khi ch\u00fang n\u1ed5i l\u00ean m\u1eb7t n\u01b0\u1edbc, ch\u00fang s\u1ebd di chuy\u1ec3n ph\u1ed5i v\u1ec1 ph\u00eda \u0111\u1ea7u; v\u00e0 khi ch\u00fang l\u0103n, ch\u00fang s\u1ebd di chuy\u1ec3n sang hai b\u00ean. H\u1ec7 th\u1ed1ng \u0111\u1ea9y do ph\u1ed5i \u0111i\u1ec1u khi\u1ec3n n\u00e0y cho ph\u00e9p c\u00e1 s\u1ea5u b\u01a1i hi\u1ec7u qu\u1ea3 m\u00e0 kh\u00f4ng c\u1ea7n v\u00e2y ho\u1eb7c ch\u00e2n ch\u00e8o.<\/p>\n\n
Kh\u1ea3 n\u0103ng c\u1ee7a c\u00e1 s\u1ea5u M\u1ef9 s\u1eed d\u1ee5ng ph\u1ed5i \u0111\u1ec3 th\u1edf v\u00e0 di chuy\u1ec3n l\u00e0m n\u1ed5i b\u1eadt vai tr\u00f2 quan tr\u1ecdng c\u1ee7a ch\u1ee9c n\u0103ng ph\u1ed5i \u1edf c\u00e1c lo\u00e0i \u0111\u1ed9ng v\u1eadt th\u1ee7y sinh. C\u00e1c c\u01a1 ch\u1ebf \u0111\u1ea9y do ph\u1ed5i t\u01b0\u01a1ng t\u1ef1 \u0111\u00e3 \u0111\u01b0\u1ee3c quan s\u00e1t \u1edf c\u00e1c lo\u00e0i th\u1ee7y sinh kh\u00e1c, ch\u1eb3ng h\u1ea1n nh\u01b0 \u86d9, k\u1ef3 gi\u00f4ng v\u00e0 r\u00f9a. Vi\u1ec7c hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ef1 ph\u1ee9c t\u1ea1p c\u1ee7a ch\u1ee9c n\u0103ng ph\u1ed5i \u1edf nh\u1eefng lo\u00e0i \u0111\u1ed9ng v\u1eadt n\u00e0y cung c\u1ea5p nh\u1eefng hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m th\u00edch nghi theo ti\u1ebfn h\u00f3a v\u00e0 vai tr\u00f2 sinh th\u00e1i c\u1ee7a ch\u00fang.<\/p>","protected":false},"excerpt":{"rendered":"
K\u1ef3 quan thi\u00ean nhi\u00ean hoang d\u00e3: Kh\u00e1m ph\u00e1 b\u00ed m\u1eadt c\u1ee7a t\u1ef1 nhi\u00ean Linh d\u01b0\u01a1ng s\u1eebng nh\u00e1nh v\u00e0 vai tr\u00f2 c\u1ee7a s\u00f3i Trong quang c\u1ea3nh r\u1ed9ng l\u1edbn c\u1ee7a V\u01b0\u1eddn qu\u1ed1c…<\/p>\n","protected":false},"author":6,"featured_media":24061,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[244],"tags":[254,97,219,1647,252,136],"class_list":["post-1522","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-natural-history","tag-wildlife","tag-science","tag-ecology","tag-adaptation","tag-nature","tag-evolution"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/1522","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\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/comments?post=1522"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/1522\/revisions"}],"predecessor-version":[{"id":1523,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/posts\/1522\/revisions\/1523"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/media\/24061"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/media?parent=1522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/categories?post=1522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/vi\/wp-json\/wp\/v2\/tags?post=1522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}