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Popis in ocena velikosti populacije signalnega raka (Pacifastacus leniusculus, Astacidae, Decapoda) v reki Dravi med HE Vuhred in HE Ožbalt = Survey and population size estimation of signal crayfish (Pacifastacus leniusculus, Astacidae, Decapoda) in river Drava between Vuhred and Ožbalt hydroelectric power plants : magistrsko deloKošir, JernejV magistrskem delu smo proučili populacijo signalnega raka (Pacifastacus leniusculus) v reki Dravi na območju med hidroelektrarnama Vuhred in Ožbalt. Na tem območju smo preverili prisotnost ... signalnega raka ocenili relativno gostoto populacije. Uporabili smo 355 osebkov signalnega raka, ki smo jih lovili z vršami v štirih zaporednih nočeh. Za odlov smo pridobili dovoljenje Ministrstva za kmetijstvo, gozdarstvo in prehrano št. 3420-12/2018/5 in dopolnilno dovoljenje št. 3420-12/2018/7. Analizirali smo razlike med spoloma (spolni dimorfizem), poškodovanost in prisotnost (relativno gostoto) glede na substrat in hitrost vodnega toka. Morfometrične meritve smo izvedli s kljunastim merilom, statistične analize pa smo izvedli z ustreznimi statističnimi testi. Ugotovili smo, da je signalni rak prisoten na celotnem odseku reke Drave med hidroelektrarno Vuhred in hidroelektrarno Ožbalt, saj smo ga lovili na vseh mikrolokacijah. Povprečna relativna gostota, določena z ulovom na enoto ribolovnega napora, je 4,7 signalnih rakov/ribolovno noč in je močno povezana s hitrostjo vodnega toka in substratom. Relativna gostota signalnih rakov upada z manjšanjem hitrosti vodnega toka in z oddaljevanjem od hidroelektrarne Vuhred, z naraščanjem velikosti substrata se relativna gostota populacije zvišuje. Populacije dosegajo najvišje relativne gostote na substratu kamnometa, najnižje pa na substratu peska. Zaznali smo statistično značilen spolni dimorfizem v velikosti in širini glavoprsja in levih ter desnih škarij. V povprečju je poškodovanih 45,6 % vseh rakov. Največkrat poškodovani deli telesa so noge, sledijo škarje. Razlik pri vrstah poškodovanosti med spoloma nismo zaznali, prav tako ni razlik pri vrstah poškodovanosti glede na mikrolokacije, razlikuje se delež poškodovanih med mikrolokacijami. Vpliva številčnosti oziroma relativne gostote na poškodovanost rakov nismo potrdili.Type of material - master's thesis ; adult, seriousPublication and manufacture - Maribor : [J. Košir], 2020Language - slovenianCOBISS.SI-ID - 39264259
Author
Košir, Jernej
Other authors
Janžekovič, Franc, 1962-
Topics
magistrska dela |
pacifastacus leniusculus |
invazivne tujerodne vrste |
reka Drava |
relativna gostota |
master theses |
pacifastacus leniusculus |
invasive alien species |
Drava river |
relative density
Library | Call number – location, accession no. ... | Copy status |
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Miklošič Library FPNM, Maribor | D MAG 57/59 KOŠIR J. Popis IN: 920200056 |
available - reading room |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Košir, Jernej | |
Janžekovič, Franc, 1962- | 13134 |
Source: Personal bibliographies
and: SICRIS
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