Ugotavljanje velikosti populacije in ogroženosti deteljinega modrina (Polyommatus thersites) na Savskih prodih pri Ljubljani : magistrsko delo

Keržan, Tatjana (author), Verovnik, Rudi (mentor)

Raziskava razširjenosti deteljinega modrina (Polyommatus thersites) v osrednji Sloveniji in določitev stanja njegovega habitata je bila opravljena zaradi določitve naravovarstvenih smernic, ki bodo omogočale ohranitev vrste v osrednji Sloveniji in na vseh podobnih območjih v Evropi. Podrobneje smo preiskovali območje na savskih prodih pri Ljubljani. Ugotovili smo, da je na območju savskih prodov prisotna stabilna populacija deteljinega modrina. Na raziskovanem območju smo opravili 17 terenskih dni v obdobju od 17. 5. do 8. 6. 2017. V tem času smo z MRR metodo markirali 152 osebkov, od tega 75 samcev in 77 samic. Dnevne velikosti populacije, ocenjene po metodi Jolly Seber, so se gibale nekje med 80 in 190 osebki, kar je izjemno za to vrsto, ki se sicer običajno pojavlja v nizkih gostotah. Na preiskovani lokaciji je več ločenih rastišč hranilne rastline turške detelje (Onobrychis sp.), tako znotraj rastišč kot tudi med ločenimi rastišči pa so se pojavljale migracije. Med migracijami so osebki preleteli tako travniške površine kot tudi makadamske poti. Deteljinega modrina smo največkrat ujeli na ploskvah s hranilnimi rastlinami (77 %), nekajkrat pa tudi izven rastišč hranilne rastline. Domači okoliš večine ponovno ulovljenih osebkov je obsegal velik del območja, vključenega v raziskavo. Habitat vrste je na preiskovanem območju na savskih prodih po naši oceni v razmeroma dobrem stanju, še vedno pa je opaziti divja odlagališča odpadkov ter zaraščanje s tujerodno suholetnico. Pomembno je, da se na območju še naprej izvajajo ukrepi za izboljšanje stanja, kot je odstranjevanje invazivnih vrst. Še naprej je potrebno izvajati redne transektne monitoringe, da tako spremljamo pojav in številčnost te ogrožene vrste. Pomembno je ozaveščanje ljudi o pomembni vlogi metuljev v okolju. K ozaveščanju bi lahko pripomogli z uvedbo naravoslovnega turizma na savskih prodih. Skrbno načrtovane aktivnosti, povezane z metulji, bi lahko predstavljale prednost tako za ohranjanje ogroženih vrst kot tudi za lokalno skupnost in obogatitev turistične ponudbe v Ljubljani.

• Language: Slovenian
• Keywords: habitat, rastišče, ogroženost, ohranjanje
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: PEF - Faculty of Education
• Publisher: [T. Keržan]
• Year: 2018
• Number of pages: 61 str.
• PID: 20.500.12556/RUL-102070
• UDC: 57(043.2)
• COBISS.SI-ID: 12052041
• Publication date in RUL: 31.08.2018

Secondary language

• Language: English
• Title: Establishing population size and endangerment of the Chapman's blue (Polyommatus thersites) at Sava river gravel near Ljubljana

Abstract

We studied the distributio of the Chapman's blue (Polyommatus thersites) in central Slovenia and its habitat choice was carried out in order to define conservation measures that will enable the long term survivour of this species in central Slovenia, but also wider in similar areas in Europe. We found that the population of the Chapman's blue is stable in the surveyed area at gravels of the Sava River. From 17. 5. to 8. 6.2017, we conducted 17 fieldwork days in the survey area. During this time, we marked 152 specimens, of which 75 were males and 77 were females, with MRR method. The daily sizes of the population, estimated with the Jolly Seber method, ranged between 80 to 190 specimens. The numbers are unusual for this species as they normally occur in low densities in central Slovenia. At the survey area were several separate habitats of The larval host plant sainfoin (Onobrychis spp.) was present in separate patches in the surveyed area and migrations among them was common. During the migrations, the specimens flew over the meadow areas and the dirt tracks. Chapman's blue was most often caught within host plant patches (77%), but several specimens were caught also outside them. The homerange of specimens caught more than once included larger part of the area included in the study. According to our estimation, the habitat of the Chapman's Blue at the survey area is in relatively good condition, although illegal waste dumps and overgrowing with invasive plant species are present. It is important that the measures for improving the larval habitat are continued, as for example, with removal of invasive plant species. Also monitoring of the abundance of this endangered species with transect counts is still required. It is important to raise public awareness regarding the significant role of butterflies in the environment. Contribution to this could be done with the introduction of the nature tourism in the area of Sava gravels. Carefully planned activities related to butterflies could be an advantage both for the conservation of the endangered species and for the local community and its touristic offer.

• Keywords: biology, biologija