{"id":271837,"date":"2023-01-25T17:47:17","date_gmt":"2023-01-25T16:47:17","guid":{"rendered":"https:\/\/zakrasnejsivimperk.cz\/?p=271837"},"modified":"2023-01-25T17:50:38","modified_gmt":"2023-01-25T16:50:38","slug":"veda-neni-nuda-invaze-larev-trilobitu-v-prvohorach-byly-klicovou-soucasti-potravniho-retezce","status":"publish","type":"post","link":"https:\/\/zakrasnejsivimperk.cz\/?p=271837","title":{"rendered":"V\u011aDA NEN\u00cd NUDA: Studie. Invaze larev trilobit\u016f: V prvohor\u00e1ch byly kl\u00ed\u010dovou sou\u010d\u00e1st\u00ed potravn\u00edho \u0159et\u011bzce"},"content":{"rendered":"
\"\"
Planktonn\u00ed larvy trilobit\u016f. Upraveno podle Laibl a kol. 2023<\/figcaption><\/figure>\n

 <\/p>\n

Larvy trilobit\u016f sehr\u00e1ly z\u00e1sadn\u00ed roli jako potrava pro n\u011bkter\u00e9 mo\u0159sk\u00e9 \u017eivo\u010dichy. V\u011bdci zjistili, \u017ee voln\u011b vzn\u00e1\u0161ej\u00edc\u00ed se larvy slou\u017eily jako mezi\u010dl\u00e1nek potravn\u00edho \u0159et\u011bzce pro v\u011bt\u0161\u00ed plovouc\u00ed organismy, kter\u00e9 se nedok\u00e1zaly \u017eivit drobn\u00fdmi planktonn\u00edmi \u0159asami. Hlavn\u00edm autorem studie z mezin\u00e1rodn\u00edho v\u00fdzkumu, publikovan\u00e9ho v \u010dasopise Palaeogeography, Palaeoclimatology, Palaeoecology, je Luk\u00e1\u0161 Laibl z Geologick\u00e9ho \u00fastavu AV \u010cR.<\/h6>\n

\"\"P\u0159es sv\u00e9 nepatrn\u00e9 rozm\u011bry \u2013 zhruba okolo jednoho milimetru \u2013 m\u011bla trilobit\u00ed ml\u00e1\u010fata tvrd\u00fd krun\u00fd\u0159 a zachov\u00e1vaj\u00ed se tak pom\u011brn\u011b hojn\u011b na mnoha paleontologick\u00fdch nalezi\u0161t\u00edch. Dodnes jsou zn\u00e1ma u v\u00edce ne\u017e 180 druh\u016f a daj\u00ed se rozd\u011blit na dva typy. Ta prvn\u00edho typu se podobala dosp\u011bl\u00fdm trilobit\u016fm a \u017eila na mo\u0159sk\u00e9m dn\u011b. Ml\u00e1\u010fata druh\u00e9ho typu byla kulovit\u00e1 nebo nafoukl\u00e1 a voln\u011b se vzn\u00e1\u0161ela v mo\u0159sk\u00e9 vod\u011b jako plankton.<\/p>\n

Na sam\u00e9m za\u010d\u00e1tku prvohor, p\u0159ed 520 a\u017e 495 miliony lety, \u017eila ml\u00e1\u010fata trilobit\u016f p\u0159edev\u0161\u00edm na mo\u0159sk\u00e9m dn\u011b. P\u0159ed 495 a\u017e 470 miliony let se ale mo\u0159sk\u00e9 ekosyst\u00e9my za\u010daly m\u011bnit a n\u011bkte\u0159\u00ed trilobiti vyvinuli planktonn\u00ed larvy. Stalo se tak n\u011bkolikr\u00e1t nez\u00e1visle na sob\u011b, a proto byla pozd\u011bj\u0161\u00ed mo\u0159e bohat\u011b o\u017eivena vzn\u00e1\u0161ej\u00edc\u00edmi se drobn\u00fdmi larvami.<\/p>\n

\u201eByla to doslova invaze. B\u011bhem n\u011bkolika des\u00edtek milion\u016f let planktonn\u00ed trilobit\u00ed larvy zaplnily oce\u00e1ny. D\u016fvodem z\u0159ejm\u011b bylo, \u017ee m\u011bly dostatek potravy v podob\u011b zv\u00fd\u0161en\u00e9ho mno\u017estv\u00ed jednobun\u011b\u010dn\u00fdch \u0159as v mo\u0159sk\u00e9 vod\u011b, tzv. fytoplanktonu. Na z\u00e1klad\u011b velikosti trilobit\u00edch larev p\u0159edpokl\u00e1d\u00e1me, \u017ee v\u011bt\u0161ina z nich se \u017eivila pr\u00e1v\u011b fytoplanktonem. Trilobit\u00ed larvy \u017eij\u00edc\u00ed na mo\u0159sk\u00e9m dn\u011b v\u0161ak nevymizely, jen byly dopln\u011bny planktonn\u00edmi,\u201c<\/em> vysv\u011btluje autor studie Luk\u00e1\u0161 Laibl z Geologick\u00e9ho \u00fastavu AV \u010cR.<\/p>\n

Trilobit\u00ed larvy jako cenn\u00fd zdroj potravy<\/h6>\n

B\u011bhem ordoviku, tedy p\u0159ed 485 a\u017e 444 miliony let, se v mo\u0159sk\u00e9 vod\u011b vzn\u00e1\u0161elo zna\u010dn\u00e9 mno\u017estv\u00ed trilobit\u00edch larev, kter\u00e9 dosahovaly velikosti od 0,3 mm a\u017e po 2 mm. V\u00fdznamn\u011b proto ovlivnily tehdej\u0161\u00ed mo\u0159sk\u00fd \u017eivot.<\/p>\n

\u201eV\u011bt\u0161\u00ed voln\u011b plovouc\u00ed \u017eivo\u010dichov\u00e9 se nedok\u00e1\u017eou \u017eivit p\u0159\u00edmo mikroskopick\u00fdmi planktonn\u00edmi \u0159asami. Do potravn\u00edho \u0159et\u011bzce tak mus\u00edte vlo\u017eit n\u011bjak\u00fd mezi\u010dl\u00e1nek \u2013 drobn\u00fd \u017eivo\u010di\u0161n\u00fd plankton, kter\u00fd \u017eere \u0159asy a je se\u017er\u00e1n n\u011b\u010d\u00edm v\u011bt\u0161\u00edm. V dne\u0161n\u00edch mo\u0159\u00edch jsou to nap\u0159\u00edklad drobn\u00ed kor\u00fd\u0161i nebo jejich larvy. V ordovick\u00fdch mo\u0159\u00edch to byly pr\u00e1v\u011b larvy trilobit\u016f,\u201c<\/em> dopl\u0148uje Luk\u00e1\u0161 Laibl.<\/p>\n

Planktonn\u00ed larvy trilobit\u016f tak p\u0159edstavovaly d\u016fle\u017eitou sou\u010d\u00e1st potravn\u00edho \u0159et\u011bzce d\u00e1vn\u00fdch mo\u0159\u00ed a slou\u017eily jako potrava pro dosp\u011bl\u00e9 plovouc\u00ed \u010dlenovce nebo prvn\u00ed obratlovce.<\/p>\n

Krom\u011b Luk\u00e1\u0161e Laibla se na v\u00fdzkumu pod\u00edleli tak\u00e9 Farid Saleh a Francesc P\u00e9rez-Peris z Univerzity v Lausanne.<\/p>\n

 <\/p>\n

Odkaz na \u010dl\u00e1nek: https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0031018223000214?via%3Dihub<\/strong><\/a><\/p>\n

Text a foto: (tz-av\u010dr)<\/strong><\/p>\n

 <\/p>\n

\"\"
Ml\u00e1\u010fata trilobit\u016f \u017eij\u00edc\u00ed na mo\u0159sk\u00e9m dn\u011b. Upraveno podle Laibl a kol. 2023<\/figcaption><\/figure>\n

 <\/p>\n

\"\"
Typy trilobit\u00edch ml\u00e1\u010fat v mo\u0159sk\u00fdch ekosyst\u00e9mech na po\u010d\u00e1tku prvohor (v kambriu a ordoviku). Upraveno podle Laibl a kol. 2023<\/figcaption><\/figure>\n
\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

  Larvy <\/p>\n","protected":false},"author":2,"featured_media":271840,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"footnotes":""},"categories":[24],"tags":[],"jetpack_featured_media_url":"https:\/\/zakrasnejsivimperk.cz\/wp-content\/uploads\/2023\/01\/25\/Typy-trilobit\u00edch-ml\u00e1\u010fat-v-mo\u0159sk\u00fdch-ekosyst\u00e9mech-na-po\u010d\u00e1tku-prvohor-v-kambriu-a-ordoviku.-Upraveno-podle-Laibl-a-kol.-2023.png","_links":{"self":[{"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/posts\/271837"}],"collection":[{"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=271837"}],"version-history":[{"count":5,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/posts\/271837\/revisions"}],"predecessor-version":[{"id":271845,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/posts\/271837\/revisions\/271845"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/media\/271840"}],"wp:attachment":[{"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=271837"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=271837"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=271837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}