![\"\"](\"https:\/\/www.vtei.cz\/wp-content\/uploads\/2019\/06\/Havel-1.jpg\")
<\/a>\nObr. 1. Vesteck\u00fd potok, p\u0159\u00edtok do rybn\u00edka \u0160eber\u00e1k
\nFig. 1. Vesteck\u00fd stream, inflow to the \u0160eber\u00e1k pond<\/h6>\n\u00davod<\/h2>\n
V\u00a0pr\u016fb\u011bhu roku 2018 byla v\u00a0obdob\u00ed b\u0159ezen a\u017e listopad sledov\u00e1na kvalita vody na vybran\u00fdch profilech hlavn\u00edch p\u0159\u00edtok\u016f do p\u0159\u00edrodn\u00edch koupali\u0161\u0165 v\u00a0jihov\u00fdchodn\u00ed \u010d\u00e1sti Prahy: rybn\u00edk \u0160eber\u00e1k (Vesteck\u00fd a\u00a0Kunratick\u00fd potok) a\u00a0p\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159 (Boti\u010d, Pitkovick\u00fd potok). Zat\u00edmco p\u0159\u00edtoky do rybn\u00edka \u0160eber\u00e1k pramen\u00ed na \u00fazem\u00ed Prahy (nebo t\u011bsn\u011b za jeho hranicemi), hlavn\u00ed p\u0159\u00edtok do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 (Boti\u010d spolu s\u00a0Pitkovick\u00fdm potokem) prot\u00e9k\u00e1 v\u011bt\u0161inou \u00fazem\u00edm St\u0159edo\u010desk\u00e9ho kraje.<\/p>\n Rybn\u00edk \u0160eber\u00e1k byl vybudov\u00e1n na Kunratick\u00e9m potoce; prvn\u00ed zm\u00ednka o\u00a0n\u011bm je z\u00a0roku 1602. Zauj\u00edm\u00e1 plochu cca 10 ha (objem vody cca 170 tis. m3<\/sup>). V\u00a0roce 1933 na n\u011bm bylo z\u0159\u00edzeno koupali\u0161t\u011b. V\u00a0sou\u010dasn\u00e9 dob\u011b je jeho \u00fa\u010del rekrea\u010dn\u00ed, slou\u017e\u00ed jako zdroj vody pro z\u00e1vlahy a\u00a0z\u00e1rove\u0148 je v\u00fdznamn\u00fdm krajinn\u00fdm prvkem [2]. Na konci roku 2018 byl vypu\u0161t\u011bn a\u00a0v\u00a0roce 2019 bude odbahn\u011bn a\u00a0revitalizov\u00e1n. M\u00e1 dva hlavn\u00ed p\u0159\u00edtoky: z\u00a0ji\u017en\u00ed strany Vesteck\u00fd potok (obr. 1<\/em>), z\u00a0v\u00fdchodn\u00ed Kunratick\u00fd potok (obr. 2<\/em>).<\/p>\n Vesteck\u00fd potok (d\u00e9lka toku cca 2,8 km) pramen\u00ed v\u00a0oblasti Vestce. Na horn\u00edm toku m\u00e1 n\u011bkolik drobn\u00fdch p\u0159\u00edtok\u016f, ale jeho hlavn\u00edm (a\u00a0v\u00a0roce 2018 v\u011bt\u0161inou vodn\u011bj\u0161\u00edm) p\u0159\u00edtokem je pravostrann\u00fd Ol\u0161ansk\u00fd potok. Ol\u0161ansk\u00fd potok (d\u00e9lka toku cca 3,5 km) pramen\u00ed dv\u011bma v\u011btvemi (Ol\u0161ansk\u00fd a\u00a0Ol\u0161ansk\u00fd z\u00e1padn\u00ed), tak\u00e9 v\u00a0oblasti Vestce, v\u00a0\u0159. km 0,5 prot\u00e9k\u00e1 Ol\u0161ansk\u00fdm rybn\u00edkem (v\u00a0roce 2018 vypu\u0161t\u011bn\u00fd a\u00a0byly odt\u011b\u017eeny sedimenty); odtud te\u010de potrub\u00edm pod jahodov\u00fdmi poli v\u00a0Kunratic\u00edch a\u00a0do Vesteck\u00e9ho potoka vt\u00e9k\u00e1 v\u00a0jeho \u0159. km 0,6, bl\u00edzko \u00fast\u00ed do \u0160eber\u00e1ku [3] (obr. 3<\/em>).<\/p>\n Kunratick\u00fd potok (celkov\u00e1 d\u00e9lka toku cca 13,3 km; z\u00a0toho p\u0159ed \u00fast\u00edm do rybn\u00edka \u0160eber\u00e1k cca 2,5 km) pramen\u00ed v\u00a0oblasti \u0160eberova [2]; na sv\u00e9m horn\u00edm toku z\u00e1sobuje Hrn\u010d\u00ed\u0159sk\u00fd rybn\u00edk (voda z\u00a0n\u011bj v\u00a0roce 2018 odt\u00e9kala d\u00e1l pouze v\u00a0jarn\u00edm obdob\u00ed\u00a0\u2013 obr. 4<\/em>). Pot\u00e9 p\u0159ed vtokem do rybn\u00edka \u0160eber\u00e1k na \u0159. km 11 prot\u00e9k\u00e1 soustavou men\u0161\u00edch rybn\u00edk\u016f (Br\u016fdek\u00a0\u2013 obr. 5<\/em>, odtok; \u0160eberovsk\u00fd\u00a0\u2013 obr. 6<\/em>; Nov\u00fd\u00a0\u2013 po v\u011bt\u0161inu roku 2018 vypu\u0161t\u011bn\u00fd, odt\u011b\u017eov\u00e1ny sedimenty\u00a0\u2013 obr. 7<\/em>). Z\u00a0prav\u00e9 strany se k\u00a0n\u011bmu za dostatku vody p\u0159ipojuj\u00ed drobn\u00e9 p\u0159\u00edtoky z\u00a0rybn\u00edka Jord\u00e1nek (obr.\u00a08<\/em>) a\u00a0z\u00a0nov\u011b rekonstruovan\u00e9ho rybn\u00edka Kov\u00e1\u0159sk\u00fd (obr. 9<\/em>). Po odtoku z\u00a0rybn\u00edka \u0160eber\u00e1k se Kunratick\u00fd potok po pr\u016ftoku Kunratick\u00fdm lesem a\u00a0dal\u0161\u00edmi men\u0161\u00edmi rybn\u00edky vl\u00e9v\u00e1 v\u00a0Bran\u00edku do Vltavy [3].<\/p>\n P\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159 (Hostiva\u0159sk\u00e1 p\u0159ehrada, vodn\u00ed d\u00edlo Hostiva\u0159) byla vybudov\u00e1na na potoce Boti\u010d v\u00a0letech 1961\u20131963. Za norm\u00e1ln\u00ed hladiny je plocha n\u00e1dr\u017ee 39,4 ha; objem vody 1,31 mil. m3<\/sup>. Jej\u00edm \u00fa\u010delem je rekreace, zm\u00edrn\u011bn\u00ed pr\u016fchodu velk\u00fdch vod, z\u00e1rove\u0148 je krajinotvorn\u00fdm a\u00a0ekologick\u00fdm prvkem a\u00a0sportovn\u00edm ryb\u00e1\u0159sk\u00fdm rev\u00edrem. Lev\u00fd b\u0159eh n\u00e1dr\u017ee je vyu\u017e\u00edv\u00e1n jako sportovn\u00ed are\u00e1l a\u00a0nejv\u011bt\u0161\u00ed pra\u017esk\u00e9 p\u0159\u00edrodn\u00ed koupali\u0161t\u011b s\u00a0kapacitou a\u017e 15 tis. osob [2].<\/p>\n Boti\u010d (celkov\u00e1 d\u00e9lka toku 34,5 km; na \u00fazem\u00ed Prahy cca 20 km) pramen\u00ed jihov\u00fdchodn\u011b od Prahy ve St\u0159edo\u010desk\u00e9m kraji v\u00a0oblasti mezi obcemi Rad\u011bjovice a\u00a0Popovi\u010dky, prot\u00e9k\u00e1 soustavou rybn\u00edk\u016f v\u00a0Pr\u016fhonick\u00e9m parku [4]. Na \u0159. km 15 \u00fast\u00ed do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 (obr. 10<\/em>). P\u0159ed \u00fast\u00edm do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 je jeho hlavn\u00edm p\u0159\u00edtokem pravostrann\u00fd Pitkovick\u00fd potok (obr. 11<\/em> a\u00a012<\/em>); do Boti\u010de se vl\u00e9v\u00e1 v\u00a0jeho \u0159. km 17,5. Celkov\u00e1 d\u00e9lka toku je 15 km (z\u00a0toho na \u00fazem\u00ed Prahy cca\u00a07,5\u00a0km), pramen\u00ed ve St\u0159edo\u010desk\u00e9m kraji u\u00a0obce Stran\u010dice. Mal\u00fdm pravostrann\u00fdm p\u0159\u00edtokem Boti\u010de je i\u00a0Dobr\u00e1 voda (do Boti\u010de \u00fast\u00ed v\u00a0jeho \u0159. km 17); v\u00a0odb\u011brov\u00fdch term\u00ednech v\u00a0roce 2018 j\u00edm voda neprot\u00e9kala. V\u00fdznamn\u00fdm p\u0159\u00edtokem Boti\u010de p\u0159ed p\u0159ehradn\u00ed n\u00e1dr\u017e\u00ed Hostiva\u0159 je levostrann\u00fd Mil\u00ed\u010dovsk\u00fd potok. Do Boti\u010de \u00fast\u00ed v\u00a0jeho \u0159. km 16 a\u00a0vt\u00e9k\u00e1 p\u0159\u00edmo do horn\u00edho konce jej\u00edho vzdut\u00ed (obr. 13<\/em>). Potok pramen\u00ed v\u00a0chr\u00e1n\u011bn\u00e9m \u00fazem\u00ed Mil\u00ed\u010dovsk\u00fd les a\u00a0v\u00a0d\u00e9lce 2,6 km prot\u00e9k\u00e1 zalesn\u011bn\u00fdm \u00fazem\u00edm s\u00a0p\u0159evahou listnat\u00fdch d\u0159evin a\u00a0soustavou rybn\u00edk\u016f: Mil\u00ed\u010dovsk\u00fd (obr.\u00a014<\/em>), Kan\u010d\u00edk (obr. 15<\/em>), Homolka (obr. 16<\/em>), ryb\u00e1\u0159sky obhospoda\u0159ovan\u00fd rybn\u00edk Vrah\u00a0\u2013 soukrom\u00fd sportovn\u00ed ryb\u00e1\u0159sk\u00fd rev\u00edr (obr. 17<\/em>), \u0160\u00e1te\u010dek (obr. 18<\/em>).<\/p>\n P\u0159\u00edmo do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 z\u00a0lev\u00e9 strany \u00fast\u00ed tak\u00e9 H\u00e1jeck\u00fd potok, kter\u00fd odvod\u0148uje reten\u010dn\u00ed n\u00e1dr\u017ee R1\u2013R3 (v\u00a0roce 2018 trvale bez odtoku). Pod p\u0159ehradn\u00ed n\u00e1dr\u017e\u00ed Hostiva\u0159 m\u00e1 Boti\u010d charakter p\u0159irozen\u00e9ho toku, prot\u00e9k\u00e1 p\u0159\u00edrodn\u00ed pam\u00e1tkou Meandry Boti\u010de\u00a0[2]. D\u00e1le te\u010de v\u011bt\u0161inou regulovan\u00fdm korytem jihov\u00fdchodn\u00ed \u010d\u00e1st\u00ed Prahy a\u00a0jako pravostrann\u00fd p\u0159\u00edtok se vl\u00e9v\u00e1 pod Vy\u0161ehradem do Vltavy [3].<\/p>\n Vzorky pro sledov\u00e1n\u00ed kvality vody p\u0159\u00edtok\u016f do obou p\u0159\u00edrodn\u00edch koupali\u0161\u0165 (\u0160eber\u00e1k, p\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159) byly v\u00a0roce 2018 odeb\u00edr\u00e1ny 1\u00d7 m\u011bs\u00ed\u010dn\u011b v\u00a0obdob\u00ed b\u0159ezen a\u017e listopad. Seznam odb\u011brov\u00fdch m\u00edst je uveden v\u00a0tabulce 1<\/em>, jejich poloha je zn\u00e1zorn\u011bna na map\u00e1ch na obr. 19<\/em> (\u0160eber\u00e1k) a\u00a0obr. 20<\/em> (p\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159). Podkladov\u00e9 mapy byly p\u0159evzaty z\u00a0port\u00e1lu Mapy.cz.<\/p>\n Vzorky vody byly odeb\u00edr\u00e1ny na hlavn\u00edch p\u0159\u00edtoc\u00edch do obou n\u00e1dr\u017e\u00ed a\u00a0na odtoku z\u00a0rybn\u00edk\u016f v\u00a0povod\u00ed (v\u017edy, pokud existoval). Odb\u011bry v\u00a0ter\u00e9nu doprov\u00e1zelo in-situ<\/em> m\u011b\u0159en\u00ed fyzik\u00e1ln\u011b-chemick\u00fdch charakteristik kvality vody (teplota, pH, koncentrace rozpu\u0161t\u011bn\u00e9ho kysl\u00edku, nasycen\u00ed vody kysl\u00edkem). Laboratorn\u00ed anal\u00fdzy vzork\u016f byly zam\u011b\u0159eny na stanoven\u00ed jednotliv\u00fdch forem dus\u00edku (N-NH4<\/sub>, N-NO3<\/sub>, N-NO2<\/sub>, N-org., N-celk.) a\u00a0fosforu (P-PO4<\/sub>, P-celk.). Hydrobiologick\u00e9 anal\u00fdzy vzork\u016f zahrnovaly stanoven\u00ed koncentrace chlorofylu-a\u00a0jako m\u011b\u0159\u00edtka biomasy fytoplanktonu a\u00a0kvalitativn\u00ed slo\u017een\u00ed spole\u010denstva fytoplanktonu a\u00a0zooplanktonu. Odb\u011bry vzork\u016f a\u00a0jejich anal\u00fdzy v\u00a0laborato\u0159i V\u00daV TGM, v. v. i., byly prov\u00e1d\u011bny standardn\u00edmi postupy [5\u201310], pop\u0159. podle schv\u00e1len\u00fdch metodik [11, 12].<\/p>\n Na obr. 21<\/em> jsou zn\u00e1zorn\u011bny pr\u016fm\u011brn\u00e9 a\u00a0maxim\u00e1ln\u00ed koncentrace N-NH4<\/sub>, N-NO3<\/sub>, P-PO4<\/sub> a\u00a0P-celk. v\u00a0z\u00e1v\u011brn\u00e9m profilu\u00a0levostrann\u00e9ho p\u0159\u00edtoku do rybn\u00edka \u0160eber\u00e1k (profil je ozna\u010den jako \u0160eber\u00e1k p\u0159\u00edtok L). Z\u00a0obr. 21<\/em> je z\u0159ejm\u00e9, \u017ee p\u0159\u00edsun \u017eivin z\u00e1v\u011brn\u00fdm profilem Vesteck\u00e9ho potoka do tohoto rekrea\u010dn\u00edho rybn\u00edka byl v\u00a0cel\u00e9m sledovan\u00e9m obdob\u00ed vysok\u00fd (koncentrace N-NH4<\/sub> 0,6\u20133 mg.l-1<\/sup>; P-PO4<\/sub> 0,08\u20131,7\u00a0mg.l-1<\/sup>; P-celk. 0,2\u20132 mg.l-1<\/sup>). Vesteck\u00fd potok byl ve sv\u00e9 horn\u00ed \u010d\u00e1sti od \u010dervence 2018 nepr\u016fto\u010dn\u00fd, ale p\u0159i odb\u011bru 15. 5. 2018 v\u00a0n\u011bm byly zaznamen\u00e1ny nejvy\u0161\u0161\u00ed koncentrace \u017eivin v\u00a0cel\u00e9m povod\u00ed rybn\u00edka \u0160eber\u00e1k (N-NH4 <\/sub>45,5 mg.l-1<\/sup>; P-PO4<\/sub> 5,33 mg.l-1<\/sup>; P-celk. 6,26 mg.l-1<\/sup>; el. konduktivita 1 390 \u00b5S.cm-1<\/sup>). P\u0159\u00edtok z\u00a0Ol\u0161ansk\u00e9ho potoka v\u00fdrazn\u011b vodu v\u00a0z\u00e1v\u011brn\u00e9m profilu p\u0159\u00edtoku do \u0160eber\u00e1ku ve v\u00fdsledku \u201ena\u0159edil\u201c (N-NH4<\/sub> 2,91 mg.l-1<\/sup>; P-PO4<\/sub> 1,70 mg.l-1<\/sup>; P-celk. 2,01 mg.l-1<\/sup>). Ol\u0161ansk\u00fd potok, jako hlavn\u00ed p\u0159\u00edtok Vesteck\u00e9ho potoka, p\u0159in\u00e1\u0161el trvale velmi vysok\u00e9 koncentrace \u017eivin (N-NH4<\/sub> 0,06\u20132,85 mg.l-1<\/sup>; P-PO4<\/sub> 0,16\u20130,42 mg.l-1<\/sup>; P-celk. 0,44\u20131,9 mg.l-1<\/sup>).<\/p>\n Pravostrann\u00fd p\u0159\u00edtok ovlivnil v\u00a0roce 2018 p\u0159\u00edsun \u017eivin do rybn\u00edka \u0160eber\u00e1k pouze minim\u00e1ln\u011b (velmi n\u00edzk\u00fd pr\u016ftok v\u00a0prvn\u00ed polovin\u011b roku 2018, nulov\u00fd pr\u016ftok v\u00a0jeho druh\u00e9 polovin\u011b). V\u00a0prvn\u00ed polovin\u011b roku 2018 byly v\u00a0p\u0159\u00edtoku Kunratick\u00e9ho potoka do rybn\u00edka \u0160eber\u00e1k oproti Vesteck\u00e9mu potoku zaznamen\u00e1ny ni\u017e\u0161\u00ed koncentrace \u017eivin (N-NH4<\/sub> 0,04\u20130,43 mg.l-1<\/sup>; P-PO4<\/sub> < 0,025\u20130,06 mg.l-1<\/sup>; P-celk. 0,09\u20130,25\u00a0mg.l-1<\/sup>). Pr\u016ftokov\u00e9 a\u00a0kvalitativn\u00ed pom\u011bry Kunratick\u00e9ho potoka ovliv\u0148ovala p\u0159edev\u0161\u00edm situace v\u00a0jeho povod\u00ed\u00a0\u2013 soustava rybn\u00edk\u016f (\u0160eberovsk\u00fd, Br\u016fdek, Jord\u00e1nek, Kov\u00e1\u0159sk\u00fd). Koncentrace hlavn\u00edch \u017eivin na odtoku z\u00a0n\u011bkter\u00fdch rybn\u00edk\u016f v\u00a0povod\u00ed jsou na obr. 21<\/em> (ozna\u010deny jako \u0160eberovsk\u00fd r. odtok; Kov\u00e1\u0159sk\u00fd r. odtok). V\u011bt\u0161ina t\u011bchto rybn\u00edk\u016f je zna\u010dn\u011b zarybn\u011bn\u00e1.<\/p>\n Na obr. 21<\/em> jsou zn\u00e1zorn\u011bny pr\u016fm\u011brn\u00e9 a\u00a0maxim\u00e1ln\u00ed koncentrace N-NH4<\/sub>, N-NO3<\/sub>, P-PO4<\/sub> a\u00a0P-celk. ve sledovan\u00fdch profilech Boti\u010de (jako hlavn\u00edm a\u00a0trval\u00e9m p\u0159\u00edtoku do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159). V\u00a0roce 2018 byly odeb\u00edr\u00e1ny vzorky ve t\u0159ech profilech: Boti\u010d p\u0159ed soutokem s\u00a0Pitkovick\u00fdm potokem (na obr. 21<\/em> ozna\u010den jako Boti\u010d nad); Pitkovick\u00fd potok p\u0159ed soutokem s\u00a0Boti\u010dem (na obr. 21<\/em> Pitkovick\u00fd p.); Boti\u010d pod soutokem s\u00a0Pitkovick\u00fdm potokem a\u00a0p\u0159ed vtokem do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 (na obr. 21<\/em> ozna\u010den jako Boti\u010d pod).ozna\u010den jako<\/p>\n Z\u00a0v\u00fdsledk\u016f je z\u0159ejm\u00e9, \u017ee oba potoky jsou pro p\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159 zna\u010dn\u00fdm zdrojem \u017eivin (p\u0159edev\u0161\u00edm fosforu). V\u00a0Boti\u010di p\u0159ed soutokem s\u00a0Pitkovick\u00fdm potokem byly v\u00a0roce 2018 koncentrace P-PO4<\/sub> < 0,025\u20130,6 mg.l-1<\/sup>; P-celk. 0,16\u20130,74 mg.l-1<\/sup>. V\u00a0Pitkovick\u00e9m potoce byly koncentrace \u017eivin jen o\u00a0m\u00e1lo ni\u017e\u0161\u00ed (P-PO4<\/sub> 0,03\u20130,24\u00a0mg.l-1<\/sup>; P-celk. 0,065\u20130,94 mg.l-1<\/sup>). Hodnoty t\u011bchto ukazatel\u016f v\u00a0Boti\u010di p\u0159ed vtokem do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 v\u011bt\u0161inou (v\u00a0z\u00e1vislosti na vz\u00e1jemn\u00fdch pr\u016ftokov\u00fdch pom\u011brech) p\u0159\u00edtok Pitkovick\u00e9ho potoka jen m\u00edrn\u011b sni\u017euje (koncentrace P-PO4<\/sub> < 0,025\u20130,38\u00a0mg.l-1<\/sup>; P-celk. 0,16\u20130,92 mg. l-1<\/sup>\u00a0\u2013 obr. 21<\/em>).<\/p>\n Mno\u017estv\u00ed \u017eivin, p\u0159it\u00e9kaj\u00edc\u00ed Mil\u00ed\u010dovsk\u00fdm potokem (koncentrace P-PO4<\/sub> < 0,025 mg.l-1<\/sup>; P-celk. 0,07\u20130,21 mg.l-1<\/sup>), nem\u00e1 vzhledem k\u00a0pom\u011bru pr\u016ftok\u016f na kvalitu vody Boti\u010de z\u00e1sadn\u00ed vliv. Hlavn\u00edm probl\u00e9mem a\u00a0rizikem pro p\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159 a\u00a0jej\u00ed rekrea\u010dn\u00ed vyu\u017eit\u00ed je (krom\u011b p\u0159\u00edsunu \u017eivin z\u00a0povod\u00ed Boti\u010de) p\u0159\u00edtok zna\u010dn\u00e9ho mno\u017estv\u00ed inokula fytoplanktonu z\u00a0rybn\u00edk\u016f v\u00a0povod\u00ed, kter\u00fdmi potok prot\u00e9k\u00e1. Nap\u0159\u00edklad v\u00a0rybn\u00edku \u0160\u00e1te\u010dek (posledn\u00ed rybn\u00edk soustavy) dosahovaly koncentrace chlorofylu-a\u00a0150\u2013170 \u00b5g.l-1<\/sup>. V\u00a0Mil\u00ed\u010dovsk\u00e9m potoce v\u00a0p\u0159\u00edtoku do Boti\u010de t\u011bsn\u011b p\u0159ed vzdut\u00edm p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 byla zji\u0161t\u011bna koncentrace chlorofylu-a\u00a0a\u017e 100 \u00b5g.l-1 <\/sup>(obr. 23<\/em>).<\/p>\n Na obr. 22<\/em> jsou graficky zn\u00e1zorn\u011bny zm\u011bny obsahu chlorofylu-a\u00a0b\u011bhem vegeta\u010dn\u00ed sezony (b\u0159ezen\u2013\u0159\u00edjen) ve vybran\u00fdch profilech Vesteck\u00e9ho a\u00a0Kunratick\u00e9ho potoka. Oba toky maj\u00ed z\u00a0hlediska biomasy fytoplanktonu v\u00fdznamn\u00fd vliv na kvalitu vody v\u00a0rybn\u00edce \u0160eber\u00e1k. Ve sledovan\u00e9m profilu \u0160eber\u00e1k\u00a0\u2013 p\u0159\u00edtok L (Vesteck\u00fd potok) byly v\u00a0srpnu a\u00a0z\u00e1\u0159\u00ed 2018 zji\u0161t\u011bny vysok\u00e9 hodnoty koncentrace chlorofylu-a 262,7 \u00b5g.l-1 <\/sup>a\u00a0168,2 \u00b5g.l-1<\/sup>. D\u016fsledkem p\u0159\u00edsunu vysok\u00e9ho mno\u017estv\u00ed \u017eivin a\u00a0inokula \u0159as doch\u00e1z\u00ed v\u00a0rybn\u00edce \u0160eber\u00e1k k\u00a0 siln\u00e9mu rozvoji fytoplanktonu. V\u00a0obdob\u00ed kv\u011bten a\u017e z\u00e1\u0159\u00ed se hodnoty chlorofylu-a\u00a0v\u00a0hladinov\u00e9 vrstv\u011b rybn\u00edka \u0160eber\u00e1k pohybovaly v\u00a0rozmez\u00ed 142,4\u2013278,5 \u00b5g.l-1 <\/sup>(obr. 22<\/em>). Vysok\u00e1 biomasa fytoplanktonu zp\u016fsobila sn\u00ed\u017een\u00ed pr\u016fhlednosti vody a\u017e na 0,15 m. V\u00a0rybn\u00edce do\u0161lo k\u00a0v\u00fdvoji mohutn\u00e9ho vodn\u00edho kv\u011btu, kter\u00fd tvo\u0159ila kok\u00e1ln\u00ed sinice Microcystis<\/em> aeruginosa<\/em> doprov\u00e1zen\u00e1 ojedin\u011bl\u00fdmi koloniemi druhu Microcystis wesenbergii<\/em>.<\/p>\n Podobn\u011b tak\u00e9 ve sledovan\u00fdch profilech na Kunratick\u00e9m potoce, kter\u00fd prot\u00e9k\u00e1 n\u011bkolika rybn\u00edky, byly v\u00a0pr\u016fb\u011bhu vegeta\u010dn\u00ed sezony zji\u0161t\u011bny nadm\u011brn\u00e9 koncentrace chlorofylu-a\u00a0(obr. 22<\/em>). Dokladem je pr\u016fb\u011bh zm\u011bn koncentrace chlorofylu-a\u00a0v\u00a0profilu \u0160eberovsk\u00fd rybn\u00edk\u00a0\u2013 odtok. V\u00a0letn\u00edch m\u011bs\u00edc\u00edch se koncentrace\u00a0chlorofylu-a\u00a0pohybovaly v\u00a0rozmez\u00ed 108,4\u2013183,3 \u00b5g.l-1<\/sup>, maxim\u00e1ln\u00ed hodnota koncentrace 311,5 \u00b5g.l-1 <\/sup>byla zji\u0161t\u011bna na odtoku v\u00a0z\u00e1v\u011bru vegeta\u010dn\u00ed sezony.<\/p>\n Hodnoty pr\u016fhlednosti vody m\u011b\u0159en\u00e9 v\u00a0rybn\u00edce \u0160eberovsk\u00fd byly v\u00a0rozmez\u00ed 0,10\u20130,25\u00a0m. V\u00a0obdob\u00ed \u010derven\u2013listopad se v\u00a0rybn\u00edce vyskytoval vodn\u00ed kv\u011bt, kter\u00fd tvo\u0159ila sinice Microcystis aeruginosa<\/em>. Nadm\u011brn\u011b vysok\u00e9 koncentrace chlorofylu-a\u00a0byly zji\u0161t\u011bny i\u00a0na odtoku z\u00a0rybn\u00edka Kov\u00e1\u0159sk\u00fd. Prvn\u00ed polovina vegeta\u010dn\u00ed sezony, a\u017e do \u010dervna, byla charakteristick\u00e1 p\u0159\u00edtomnost\u00ed n\u00edzk\u00e9 biomasy fytoplanktonu, n\u00e1sledn\u011b do\u0161lo\u00a0k\u00a0jej\u00edmu enormn\u00edmu rozvoji. Koncentrace chlorofylu-a\u00a0dos\u00e1hla v\u00a0\u010dervenci hodnoty 413,5 \u00b5g.l-1 <\/sup>a\u00a0v\u00a0z\u00e1\u0159\u00ed maxima 646,2 \u00b5g.l-1<\/sup>. Rozvoj biomasy fytoplanktonu vedl v\u00a0rybn\u00edce ke vzniku vegeta\u010dn\u00edho z\u00e1kalu a\u00a0poklesu pr\u016fhlednosti vody. Vegeta\u010dn\u00ed z\u00e1kal byl tvo\u0159en v\u00a0prvn\u00ed polovin\u011b l\u00e9ta zejm\u00e9na z\u00e1stupci ze skupiny zelen\u00fdch \u0159as (Chlorophyceae<\/em>). Hodnoty pr\u016fhlednosti vody m\u011b\u0159en\u00e9 v\u00a0rybn\u00edce se v\u00a0t\u00e9to dob\u011b pohybovaly kolem 0,15 m. V\u00a0z\u00e1v\u011bru vegeta\u010dn\u00ed sezony byla na odtoku z\u00a0n\u00e1dr\u017ee zji\u0161t\u011bna nejvy\u0161\u0161\u00ed hodnota koncentrace chlorofylu-a\u00a0(646,2\u00a0\u00b5g.l-1<\/sup>) ze v\u0161ech sledovan\u00fdch lokalit. Ve fytoplanktonu se v\u00a0tomto p\u0159\u00edpad\u011b vyskytovala pouze obrn\u011bnka Ceratium hirundinella<\/em>, z\u00e1stupce skupiny Dinophyceae<\/em>.<\/p>\n Zm\u011bny obsahu chlorofylu-a\u00a0b\u011bhem vegeta\u010dn\u00ed sezony jsou pro vybran\u00e9 profily Boti\u010de a\u00a0Mil\u00ed\u010dovsk\u00e9ho potoka zn\u00e1zorn\u011bny na obr. 23<\/em>. Mno\u017estv\u00ed fytoplanktonu v\u00a0potoce Boti\u010d bylo sledov\u00e1no ve dvou profilech: nad soutokem s\u00a0Pitkovick\u00fdm potokem (Boti\u010d nad) a\u00a0na vtoku do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 (Boti\u010d pod). V\u00a0m\u00edst\u011b pod soutokem byly hodnoty chlorofylu-a\u00a0v\u00a0Boti\u010di m\u00edrn\u011b ni\u017e\u0161\u00ed ne\u017e v\u00a0profilu nad soutokem s\u00a0Pitkovick\u00fdm potokem, kter\u00fd m\u011bl d\u00edky sv\u00e9mu n\u00edzk\u00e9mu obsahu fytoplanktonu v\u00a0pr\u016fb\u011bhu vegeta\u010dn\u00ed sezony (maxim\u00e1ln\u00ed zji\u0161t\u011bn\u00e1 hodnota chlorofylu-a\u00a09,2 \u00b5g.l-1<\/sup>) \u0159ed\u00edc\u00ed efekt pro vodu v\u00a0Boti\u010di. P\u0159esto zejm\u00e9na v\u00a0jarn\u00edm obdob\u00ed (b\u0159ezen\u2013duben) byla biomasa fytoplanktonu v\u00a0Boti\u010di na vtoku do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 pom\u011brn\u011b vysok\u00e1 (koncentrace chlorofylu-a\u00a0cca\u00a067\u00a0\u00b5g.l-1<\/sup>). V\u00fdznamn\u00e9 mno\u017estv\u00ed fytoplanktonu se do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 dost\u00e1v\u00e1 tak\u00e9 Mil\u00ed\u010dovsk\u00fdm potokem (obr. 23<\/em>), kter\u00fd prot\u00e9k\u00e1 soustavou rybn\u00edk\u016f v\u00a0Mil\u00ed\u010dovsk\u00e9m lese. Vodnost Mil\u00ed\u010dovsk\u00e9ho potoka je z\u00e1visl\u00e1 na odtoku z\u00a0rybn\u00edka \u0160\u00e1te\u010dek, ze kter\u00e9ho ve sledovan\u00e9m obdob\u00ed vzhledem k\u00a0poklesu hladiny vody (d\u016fsledek nedostatku sr\u00e1\u017eek a\u00a0sucha) \u00a0v\u00a0n\u011bkter\u00fdch term\u00ednech odb\u011bru vzork\u016f voda neodt\u00e9kala. Nicm\u00e9n\u011b v\u00a0\u010dervnu a\u00a0\u010dervenci byla ve sledovan\u00e9m profilu Mil\u00ed\u010dovsk\u00e9ho potoka zji\u0161t\u011bna koncentrace chlorofylu-a\u00a097,4\u201399,2 \u00b5g.l-1<\/sup>. P\u0159\u00edmo v\u00a0rybn\u00edce \u0160\u00e1te\u010dek se v\u00a0kv\u011btnu a\u017e \u010dervenci hodnoty chlorofylu-a\u00a0pohybovaly v\u00a0rozmez\u00ed 99,2\u2013170,3 \u00b5g. l-1<\/sup>. Odtok z\u00a0rybn\u00edka \u0160\u00e1te\u010dek Mil\u00ed\u010dovsk\u00fdm potokem je v\u00fdznamn\u00fdm zdrojem inokula fytoplanktonu pro bl\u00edzkou p\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159.<\/p>\n Druhov\u00e9 slo\u017een\u00ed fytoplanktonu sledovan\u00fdch profil\u016f bylo, s\u00a0v\u00fdjimkou potok\u016f Boti\u010de a\u00a0Pitkovick\u00e9ho, ovlivn\u011bno skladbou fytoplanktonu rybn\u00edk\u016f. V\u00a0jarn\u00edm obdob\u00ed se vyskytovali p\u0159edev\u0161\u00edm z\u00e1stupci centrick\u00fdch rozsivek (Cyclostephanos invisitatus<\/em>, Aulacoseira granulata<\/em>, Melosira varians<\/em>, Stephanodiscus<\/em> spp.) a\u00a0druhy rod\u016f Cryptomonas <\/em>(Cryptophyceae<\/em>), Chrysococcus<\/em> (Chrysophyceae<\/em>) a\u00a0Trachelomonas<\/em> (Euglenophyta<\/em>). V\u00a0letn\u00edm a\u00a0podzimn\u00edm obdob\u00ed bylo slo\u017een\u00ed spole\u010denstva fytoplanktonu velmi pestr\u00e9 s\u00a0p\u0159\u00edtomnost\u00ed \u0159ady taxon\u016f, zejm\u00e9na zelen\u00fdch \u0159as (Chlorophyceae<\/em>). Ze skupiny kok\u00e1ln\u00edch zelen\u00fdch \u0159as se vyskytovaly druhy rod\u016f Actinastrum<\/em>, Ankyra<\/em>, Coelastrum<\/em>, Crucigenia<\/em>, Desmodesmus<\/em>, Dictyosphaerium<\/em>, Monoraphidium<\/em>, Oocystis<\/em>, Pediastrum<\/em>, Scenedesmus<\/em>, Tetraedron<\/em>. Bi\u010d\u00edkovci byli zastoupeni druhy rod\u016f Euglena<\/em>, Chlamydomonas<\/em>, Pandorina<\/em>, Phacotus<\/em>, Pteromonas<\/em>. Vodn\u00ed kv\u011bt, tvo\u0159en\u00fd kok\u00e1ln\u00ed sinic\u00ed Microcystis<\/em> aeruginosa<\/em>, byl v\u00a0pr\u016fb\u011bhu sledov\u00e1n\u00ed zaznamen\u00e1n na odtoku z\u00a0rybn\u00edk\u016f \u0160eber\u00e1k a\u00a0\u0160eberovsk\u00fd. V\u00fdskyt ojedin\u011bl\u00fdch vlo\u010dek vl\u00e1knit\u00e9 sinice Aphanizomenon<\/em> flos-aquae <\/em>byl zji\u0161t\u011bn ve fytoplanktonu rybn\u00edk\u016f \u0160eber\u00e1k a\u00a0Kov\u00e1\u0159sk\u00fd.<\/p>\n Kvalitativn\u00ed slo\u017een\u00ed spole\u010denstva zooplanktonu bylo v\u00a0roce 2018 orienta\u010dn\u011b sledov\u00e1no v\u00a0rybn\u00edc\u00edch v\u00a0povod\u00ed Kunratick\u00e9ho potoka (\u0160eberovsk\u00fd, Br\u016fdek, Kov\u00e1\u0159sk\u00fd) a\u00a0Boti\u010de (Homolka, Vrah, \u0160\u00e1te\u010dek) v\u00a0\u010dervenci a\u00a0\u0159\u00edjnu. Oproti rybn\u00edk\u016fm a\u00a0n\u00e1dr\u017e\u00edm v\u00a0povod\u00ed Motolsk\u00e9ho a\u00a0Litovick\u00e9ho potoka v\u00a0z\u00e1padn\u00ed \u010d\u00e1sti Prahy\u00a0[1] bylo slo\u017een\u00ed zooplanktonu v\u00a0t\u011bchto rybn\u00edc\u00edch velmi uniformn\u00ed, indikuje vysokou ryb\u00ed obs\u00e1dku. Ve v\u0161ech sledovan\u00fdch rybn\u00edc\u00edch v\u00a0obou term\u00ednech odb\u011br\u016f v\u00a0jeho slo\u017een\u00ed dominovali z\u00e1stupci skupin:<\/p>\n Sledov\u00e1n\u00ed p\u0159\u00edtok\u016f do koupali\u0161\u0165 na jihov\u00fdchod\u011b Prahy (rybn\u00edk \u0160eber\u00e1k, p\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159) prob\u00edhalo v\u00a0teplotn\u011b nadpr\u016fm\u011brn\u00e9m a\u00a0sr\u00e1\u017ekov\u011b chud\u00e9m roce 2018. V\u0161echny p\u0159\u00edtoky (Vesteck\u00fd a\u00a0Kunratick\u00fd potok, Boti\u010d) charakterizuje vysok\u00fd p\u0159\u00edsun \u017eivin (N, P), kter\u00fd sv\u00fdm projevem n\u00e1sledn\u011b zna\u010dn\u011b omezuje jejich rekrea\u010dn\u00ed vyu\u017eit\u00ed. Podle \u00fadaj\u016f Hygienick\u00e9 stanice hl. m. Prahy [13] byla v\u00a0sezon\u00e1ch 2017 a\u00a02018 (p\u0159edev\u0161\u00edm z\u00a0d\u016fvodu nadm\u011brn\u00e9ho rozvoje sinic) voda obou koupali\u0161\u0165 charakterizov\u00e1na n\u00e1sledovn\u011b:<\/p>\n Je z\u0159ejm\u00e9, \u017ee hlavn\u00edm d\u016fvodem t\u00e9to situace je vysok\u00fd p\u0159\u00edsun \u017eivin z\u00a0p\u0159\u00edtok\u016f s\u00a0negativn\u00edmi d\u016fsledky pro ob\u011b n\u00e1dr\u017ee. Bez opat\u0159en\u00ed v\u00a0jejich povod\u00ed lze jen st\u011b\u017e\u00ed o\u010dek\u00e1vat zlep\u0161en\u00ed podm\u00ednek pro rekrea\u010dn\u00ed vyu\u017eit\u00ed obou lokalit.<\/p>\n P\u0159\u00edsp\u011bvek vznikl za podpory projektu CZ.07.1.02\/0.0\/0.0\/16_040\/0000382: Rekrea\u010dn\u00ed potenci\u00e1l vody v\u00a0Praze\u00a0\u2013 stav a\u00a0v\u00fdhledy; \u0159e\u0161en\u00e9ho v\u00a0r\u00e1mci opera\u010dn\u00edho programu Praha\u00a0\u2013 p\u00f3l r\u016fstu II.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":" Mo\u017enost rekrea\u010dn\u00edho vyu\u017eit\u00ed n\u011bkter\u00fdch (nejen) pra\u017esk\u00fdch n\u00e1dr\u017e\u00ed je omezena p\u0159edev\u0161\u00edm kvalitou p\u0159it\u00e9kaj\u00edc\u00ed vody. \u010cl\u00e1nek navazuje na p\u0159edchoz\u00ed \u010d\u00e1st a shrnuje v\u00fdsledky sledov\u00e1n\u00ed kvality vody v roce 2018 ve vybran\u00fdch profilech p\u0159\u00edtok\u016f do rybn\u00edka \u0160eber\u00e1k (Vesteck\u00fd a Kunratick\u00fd potok) a do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159 (Boti\u010d s Pitkovick\u00fdm potokem). <\/p>\n","protected":false},"author":8,"featured_media":6364,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[87],"tags":[6,261,1591,1545,1546],"coauthors":[22,1531,1532],"class_list":["post-6518","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hydrochemistry-radioecology-microbiology","tag-fytoplankton","tag-kvalita-vody","tag-potoky","tag-ziviny","tag-zooplankton"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/posts\/6518","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/comments?post=6518"}],"version-history":[{"count":4,"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/posts\/6518\/revisions"}],"predecessor-version":[{"id":30520,"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/posts\/6518\/revisions\/30520"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/media\/6364"}],"wp:attachment":[{"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/media?parent=6518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/categories?post=6518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/tags?post=6518"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.vtei.cz\/en\/wp-json\/wp\/v2\/coauthors?post=6518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/a>\nObr. 2. Kunratick\u00fd potok, p\u0159\u00edtok do rybn\u00edka \u0160eber\u00e1k
\nFig. 2. Kunratick\u00fd stream, inflow to the \u0160eber\u00e1k pond<\/h6>\n<\/a>\nObr. 3. Ol\u0161ansk\u00fd potok, p\u0159\u00edtok do Vesteck\u00e9ho potoka
\nFig. 3. Ol\u0161ansk\u00fd stream, inflow to the Vesteck\u00fd stream<\/h6>\n<\/a>\nObr. 4. Hrn\u010d\u00ed\u0159sk\u00fd rybn\u00edk, odtok
\nFig. 4. Hrn\u010d\u00ed\u0159sk\u00fd pond, outflow<\/h6>\n<\/a>\nObr. 5. Rybn\u00edk Br\u016fdek, odtok
\nFig. 5. Br\u016fdek pond, outflow<\/h6>\n<\/a>\nObr. 6. \u0160eberovsk\u00fd rybn\u00edk
\nFig. 6. \u0160eberovsk\u00fd pond<\/h6>\n<\/a>\nObr. 7. Nov\u00fd rybn\u00edk
\nFig. 7. Nov\u00fd pond<\/h6>\n<\/a>\nObr. 8. Rybn\u00edk Jord\u00e1nek
\nFig. 8. Jord\u00e1nek pond<\/h6>\n<\/a>\nObr. 9. Rybn\u00edk Kov\u00e1\u0159sk\u00fd
\nFig. 9. Kov\u00e1\u0159sk\u00fd pond<\/h6>\n<\/a>\nObr. 10. Boti\u010d\u00a0\u2013 p\u0159\u00edtok do p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159
\nFig. 10. Boti\u010d stream\u00a0\u2013 inflow to the Hostiva\u0159 reservoir<\/h6>\n<\/a>\nObr. 11. Pitkovick\u00fd potok p\u0159ed\u00a0Boti\u010dem
\nFig. 11. Pitkovick\u00fd stream before Boti\u010d<\/h6>\n<\/a>\nObr. 12. Soutok Pitkovick\u00e9ho potoka a\u00a0Boti\u010de
\nFig. 12. Confluence Pitkovick\u00fd and Boti\u010d streams<\/h6>\n<\/a>\nObr. 13. Mil\u00ed\u010dovsk\u00fd potok; p\u0159ed soutokem s\u00a0Boti\u010dem
\nFig. 13. Mil\u00ed\u010dovsk\u00fd stream; before the confluence with the Boti\u010d stream<\/h6>\n<\/a>\nObr. 14. Mil\u00ed\u010dovsk\u00fd rybn\u00edk
\nFig. 14. Mil\u00ed\u010dovsk\u00fd pond<\/h6>\n<\/a>\nObr. 15. Rybn\u00edk Kan\u010d\u00edk
\nFig. 15. Kan\u010d\u00edk pond<\/h6>\n<\/a>\nObr. 16. Rybn\u00edk Homolka
\nFig. 16. Homolka pond<\/h6>\n<\/a>\nObr. 17. Rybn\u00edk Vrah
\nFig. 17. Vrah pond<\/h6>\n<\/a>\nObr. 18. Rybn\u00edk \u0160\u00e1te\u010dek
\nFig. 18. \u0160\u00e1te\u010dek pond<\/h6>\nSledovan\u00e9 lokality, metodika odb\u011br\u016f a\u00a0anal\u00fdz vzork\u016f<\/h2>\n
<\/a>\nObr. 19. Odb\u011brov\u00e1 m\u00edsta v\u00a0povod\u00ed rybn\u00edka \u0160eber\u00e1k
\nFig. 19. Sampling sites in the \u0160eber\u00e1k pond catchment area<\/h6>\n<\/a>\nObr. 20. Odb\u011brov\u00e1 m\u00edsta v\u00a0povod\u00ed p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159
\nFig. 20. Sampling sites in the Hostiva\u0159 reservoir catchment area<\/h6>\nTabulka 1. Seznam odb\u011brov\u00fdch m\u00edst
\nTable 1. List of sampling sites<\/h5>\n<\/a>\nV\u00fdsledky<\/h2>\n
Chemick\u00e9 ukazatele<\/h3>\n
Rybn\u00edk \u0160eber\u00e1k a\u00a0p\u0159\u00edtoky<\/strong><\/h4>\n
Vesteck\u00fd potok<\/h4>\n
Kunratick\u00fd potok<\/h4>\n
P\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159 <\/strong><\/h4>\n
Boti\u010d a\u00a0p\u0159\u00edtoky<\/h4>\n
<\/a>\nObr. 21. Pr\u016fm\u011brn\u00e9 a\u00a0maxim\u00e1ln\u00ed hodnoty N-NH4<\/sub>, N-NO3<\/sub>, P-PO4<\/sub> a\u00a0P-celk. ve sledovan\u00fdch\u00a0profilech v\u00a0povod\u00ed \u0160eber\u00e1ku a\u00a0Hostiva\u0159sk\u00e9 p\u0159ehrady (sloupec = pr\u016fm\u011br, troj\u00faheln\u00ed\u010dek = maximum)
\nFig. 21. Mean and maximum values of N-NH4<\/sub>, N-NO3<\/sub>, P-PO4<\/sub> and P-celk. in the studied profiles of the \u0160eber\u00e1k pond and Hostiva\u0159 reservoir catchment are (column = mean, triangle = maximum)<\/h6>\nMil\u00ed\u010dovsk\u00fd potok<\/h4>\n
Hydrobiologick\u00e9 ukazatele<\/h3>\n
Chlorofyl-a<\/strong><\/h4>\n
Vesteck\u00fd a\u00a0Kunratick\u00fd potok<\/h4>\n
<\/a>\nObr. 22. Sezonn\u00ed zm\u011bny koncentrace chlorofylu-a\u00a0ve sledovan\u00fdch\u00a0profilech v\u00a0povod\u00ed \u0160eber\u00e1ku
\nFig. 22. Seasonal changes of chlorophyll-a\u00a0concentration in the studied profiles of the \u0160eber\u00e1k catchment area<\/h6>\n<\/a>\nObr. 23. Sezonn\u00ed zm\u011bny koncentrace chlorofylu-a\u00a0ve sledovan\u00fdch\u00a0profilech v\u00a0povod\u00ed p\u0159ehradn\u00ed n\u00e1dr\u017ee Hostiva\u0159
\nFig. 23. Seasonal changes of chlorophyll-a\u00a0concentration in the studied profiles of the Hostiva\u0159 reservoir catchment area<\/h6>\nBoti\u010d a\u00a0Mil\u00ed\u010dovsk\u00fd potok<\/h4>\n
Fytoplankton<\/h4>\n
Zooplankton<\/h4>\n
\n
<\/a>\nObr. 24. Vodn\u00ed kv\u011bt sinic\u00a0\u2013 rybn\u00edk \u0160eber\u00e1k
\nFig. 24. Cyanobacteria water bloom\u00a0\u2013 \u0160eber\u00e1k pond<\/h6>\n<\/a>\nObr. 25. Vodn\u00ed kv\u011bt sinic\u00a0\u2013 p\u0159ehradn\u00ed n\u00e1dr\u017e Hostiva\u0159
\nFig. 25. Cyanobacteria water bloom\u00a0\u2013 Hostiva\u0159 reservoir<\/h6>\nZ\u00e1v\u011br<\/h2>\n
\n
\n
\n
Pod\u011bkov\u00e1n\u00ed<\/h3>\n