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30 Elo 2008 - 22:56:16

Lepakoiden yö

Pihamaallamme lentelevät lepakot innostivat meidät mukaan Seitsemisen luontokeskuksessa järjestettävään Lepakoiden yö tapahtumaan. Lepakkotutkija Emma Kosonen piti kahden tunnin alustuksen lepakoiden ihmeelliseen maailmaan. Lepakko on maailman ainoa lentävä nisäkäs, maailman 1200 lepakkolajista suomessa esiintyy 12. Pohjanlepakko on suomen yleisin lepakkolaji ja se saalistaa yöaikaan pihapiirien tuntumassa kaarellen puunlatvojen yläpuolella. Näitä veijareita meidänkin pihamaalla ilmeisesti lentelee.
Lepakot ovat pitkäikäisiä, on löydetty 41 vuotta vanha rengastettu lepakko Kaukasuksesta. Lepakoiden  rengastus ja kiinniottaminen on luvanvaraista toimintaa. Suomessa on yhdeksällä henkilöllä lupa rengastaa lepakoita. Lepakoiden kiinniottaminen ja lajimäärittely on melkoisen haastavaa toimintaa, Kosonen kertoo ongelmia mitä esim. eri siippalajien märittelyssä on. Lepakoiden lajimäärittelyssä käytetään hyväksi niiden tuottamaa ääntä. Ääntä ei ihmiskorva kykene kuulemaan, mutta tähän käytetään lepakkoilmaisinta, detektoria. Detektori on laite, joka vastaanottaa lepakoiden kaikuluotausäänet ja muuntaa ne ihmiskorvin kuultaviksi. Halvimmat versiot maksavat noin 200-300 euroa, joten ihan markettivempaimesta ei ole kyse.
Lepakot ovat olleet rauhoitettuja Suomessa vuodesta 1923 lähtien. Ne kuuluvat samaan luontodirektiivin liitteessä lueteltuihin lajeihin kuin liito-oravat.
Luennon jälkeen lähdimme maastoon tutustumaan lepakoihin ihan livenä. Suunnistimme Koveron perinnekylään. Koveron tila on perustettu 1850-luvulla. Nykyisen pihapiirin vanhin rakennus on pakari 1870-luvulta. Komean päärakennuksen rakennustyöt alkoivat vuonna 1881. Päärakennuksen järeät seinähirret ovat käsinveistetyt. Lepakot viihtyvät erinomaisesti kulttuurihistoriallisessa ympäristössä ja meidän kuulijoiden iloksi Kovero ei tuottanut pettymystä. Paikalla oli runsaasti lepakoita, niin viiksisiippojen kuin pohjanlepakonkin ääntelyä kuulimme detektorin kautta. Toki nämä nahkasiivet nähtiin myös viuhahtelevan pihamaalla. Viiksisiipat pyörivät lähellä maanpintaa kun taas pohjanlepakot pyörivät ylhäällä puidenlatvojen korkeudella.
Todella mielenkiintoinen ilta ja saimme samalla selville noiden omalla pihamaalla pyörivien lepakoiden todennäköisen lajimäärityksen  - Pohjanlepakoita ;)

Admin · 120 lukukertaa · 2 kommenttia

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