{"id":308334,"date":"2024-05-26T12:11:16","date_gmt":"2024-05-26T11:11:16","guid":{"rendered":"https:\/\/zakrasnejsivimperk.cz\/?p=308334"},"modified":"2024-05-27T13:41:37","modified_gmt":"2024-05-27T12:41:37","slug":"jizni-cechy-candati-na-lipne-prekvapili-odborniky-treli-se-opakovane","status":"publish","type":"post","link":"https:\/\/zakrasnejsivimperk.cz\/?p=308334","title":{"rendered":"JI\u017dN\u00cd \u010cECHY: Cand\u00e1ti na Lipn\u011b p\u0159ekvapili odborn\u00edky, t\u0159eli se toti\u017e opakovan\u011b"},"content":{"rendered":"
\"\"
Jan Kube\u010dka prohl\u00ed\u017e\u00ed jikry<\/figcaption><\/figure>\n
Sledov\u00e1n\u00ed rozmno\u017eov\u00e1n\u00ed cand\u00e1t\u016f na nejv\u011bt\u0161\u00edm \u010desk\u00e9m p\u0159ehradn\u00edm jeze\u0159e Lipno p\u0159ineslo p\u0159ekvapiv\u00e9 poznatky. V\u011bdci z Biologick\u00e9ho centra Akademie v\u011bd \u010cR (BC AV \u010cR) spole\u010dn\u011b s jiho\u010desk\u00fdmi ryb\u00e1\u0159i z \u010cesk\u00e9ho ryb\u00e1\u0159sk\u00e9ho svazu (\u010cRS), kte\u0159\u00ed pro cand\u00e1ty rozm\u00edstili v n\u00e1dr\u017ei celkem 61 um\u011bl\u00fdch hn\u00edzd, pozorovali zaj\u00edmav\u00fd jev. Cand\u00e1ti se t\u0159eli opakovan\u011b. Tato pozorov\u00e1n\u00ed nabour\u00e1vaj\u00ed tradi\u010dn\u00ed p\u0159edstavu o rozmno\u017eov\u00e1n\u00ed t\u011bchto dravc\u016f.<\/h6>\n
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Jikry<\/figcaption><\/figure>\n

\"\"V\u011bdci s ryb\u00e1\u0159i sledovali v\u00fdt\u011br cand\u00e1ta a l\u00edhnut\u00ed jiker na Lipn\u011b b\u011bhem dubna a kv\u011btna. Jaro m\u011blo pom\u011brn\u011b netypick\u00fd teplotn\u00ed pr\u016fb\u011bh: v prvn\u00edm obdob\u00ed panovalo tepl\u00e9 po\u010das\u00ed a vysok\u00e9 teploty p\u0159es 15 stup\u0148\u016f Celsia. Tohoto obdob\u00ed vyu\u017eili zejm\u00e9na cand\u00e1ti v z\u00e1toce Had\u00ed luka, kter\u00e1 je z\u00e1rove\u0148 chr\u00e1n\u011bnou ryb\u00ed oblast\u00ed \u010cRS. Postupn\u011b cand\u00e1ti obsadili 14 z 15 instalovan\u00fdch hn\u00edzd. Po 17. dubnu do\u0161lo k prudk\u00e9mu ochlazen\u00ed, kter\u00e9 \u201ezmrazilo\u201c t\u0159en\u00ed na cel\u00e9 n\u00e1dr\u017ei. Dal\u0161\u00ed vyt\u0159en\u00e1 hn\u00edzda na\u0161li odborn\u00edci a\u017e 1. kv\u011btna, po zlep\u0161en\u00ed po\u010das\u00ed na konci dubna.<\/p>\n

V\u011bt\u0161ina sn\u016f\u0161ek jiker v z\u00e1toce Had\u00ed luka p\u0159e\u010dkala v po\u0159\u00e1dku chladn\u00e9 obdob\u00ed a vyl\u00edhla se v prvn\u00ed dek\u00e1d\u011b kv\u011btna. \u201eVelmi zaj\u00edmav\u00fdm jevem byla skute\u010dnost, \u017ee na ji\u017e nat\u0159en\u00e1 hn\u00edzda p\u0159ib\u00fdvaly b\u011bhem inkubace nov\u00e9 jikry a n\u011bkter\u00e1 hn\u00edzda byla dokonce nov\u011b osazena \u010derstv\u00fdmi jikrami pot\u00e9, co se p\u0159edchoz\u00ed v\u00e1rka jiker \u00fasp\u011b\u0161n\u011b vyl\u00edhla. Tato pozorov\u00e1n\u00ed nabour\u00e1vaj\u00ed tradi\u010dn\u00ed p\u0159edstavu, \u017ee se na hn\u00edzd\u011b vyt\u00edr\u00e1 jeden p\u00e1r cand\u00e1t\u016f a po v\u00fdt\u011bru samec pouze hl\u00edd\u00e1 sn\u016f\u0161ku,\u201c<\/em> \u0159\u00edk\u00e1 vedouc\u00ed v\u00fdzkumn\u00e9ho projektu Jan Kube\u010dka z Hydrobiologick\u00e9ho \u00fastavu BC AV \u010cR.<\/p>\n

Ke t\u0159en\u00ed cand\u00e1ta tedy zjevn\u011b doch\u00e1z\u00ed opakovan\u011b. \u201eZji\u0161t\u011bn\u00ed dob\u0159e koresponduje s na\u0161\u00edm d\u0159\u00edv\u011bj\u0161\u00edm objevem n\u011bkolika velikostn\u00edch skupin, kohort, pl\u016fdku cand\u00e1ta. Ukazuje se, \u017ee r\u016fzn\u00e9 roky maj\u00ed r\u016fznou \u00fasp\u011b\u0161nost r\u016fzn\u011b star\u00e9ho pl\u016fdku cand\u00e1ta, v n\u011bkter\u00fdch letech p\u0159eva\u017euj\u00ed \u201etrpasli\u010d\u00ed\u201c kohorty z pozdn\u00edch v\u00fdt\u011br\u016f, v jin\u00fdch letech naopak dominuje pl\u016fdek z jarn\u00edho v\u00fdt\u011bru,\u201c<\/em> vysv\u011btluje Jan Kube\u010dka.<\/p>\n

Z dosavadn\u00edch \u00fadaj\u016f je patrn\u00e9, \u017ee nejl\u00e9pe se rozmno\u017euj\u00ed cand\u00e1ti v Had\u00ed z\u00e1toce. Z ostatn\u00edch 46 um\u011bl\u00fdch hn\u00edzd, rozm\u00edst\u011bn\u00fdch v n\u00e1dr\u017ei, samci obsadili jen 5 kus\u016f.<\/p>\n

Osud leto\u0161n\u00edho pl\u016fdku cand\u00e1ta budou v\u011bdci pozorovat i d\u00e1le. V polovin\u011b \u010dervna budou sledovat v\u0161echny vyl\u00edhnut\u00e9 larvy a pl\u016fdek jako takzvan\u00fd ichthyoplankton. Skute\u010dnou s\u00edlu nastupuj\u00edc\u00edho ro\u010dn\u00edku a pod\u00edly jednotliv\u00fdch velikostn\u00edch kohort pl\u016fdku se pak dozv\u011bd\u00ed b\u011bhem pr\u016fzkumu pelagick\u00e9ho pl\u016fdkov\u00e9ho spole\u010denstva koncem srpna.<\/p>\n

Cand\u00e1t obecn\u00fd pat\u0159\u00ed k nejvyhled\u00e1van\u011bj\u0161\u00edm dravc\u016fm z hlediska sportovn\u00edho rybolovu a v lipensk\u00e9 n\u00e1dr\u017ei byl velmi po\u010detn\u00fd je\u0161t\u011b v posledn\u00edch dvou dek\u00e1d\u00e1ch 20. stolet\u00ed. Od roku 2005 jeho mno\u017estv\u00ed v n\u00e1dr\u017ei v\u00fdznamn\u011b pokleslo. Ryb\u00e1\u0159i s pomoc\u00ed hydrobiolog\u016f proto pravideln\u011b sleduj\u00ed ryb\u00ed spole\u010denstvo Lipna s c\u00edlem zjistit p\u0159\u00ed\u010diny \u00fabytku cand\u00e1ta a zav\u00e9st opat\u0159en\u00ed k zaji\u0161t\u011bn\u00ed stability jeho populace.<\/p>\n

Detailn\u011bji k v\u00fdvoji populace cand\u00e1ta v Cand\u00e1ti na Lipn\u011b bojuj\u00ed o p\u0159e\u017eit\u00ed. V\u011bdci budou n\u011bkolikr\u00e1t t\u00fddn\u011b kontrolovat jejich hn\u00edzda.<\/strong><\/a><\/p>\n

 <\/p>\n

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

\n

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

Sledov\u00e1n\u00ed rozmno\u017eov\u00e1n\u00ed <\/p>\n","protected":false},"author":2,"featured_media":308335,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"footnotes":""},"categories":[128],"tags":[],"jetpack_featured_media_url":"https:\/\/zakrasnejsivimperk.cz\/wp-content\/uploads\/2024\/05\/23\/Jan-Kubecka-prohlizi-jikry.jpg","_links":{"self":[{"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/posts\/308334"}],"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=308334"}],"version-history":[{"count":6,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/posts\/308334\/revisions"}],"predecessor-version":[{"id":308621,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/posts\/308334\/revisions\/308621"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=\/wp\/v2\/media\/308335"}],"wp:attachment":[{"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=308334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=308334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zakrasnejsivimperk.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=308334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}