• strict warning: Non-static method view::load() should not be called statically in /home/lesbisyg/public_html/sites/default/modules/views/views.module on line 906.
  • strict warning: Declaration of views_attach_plugin_display_node_content::options_submit() should be compatible with views_plugin_display::options_submit(&$form, &$form_state) in /home/lesbisyg/public_html/sites/default/modules/views_attach/views_attach_plugin_display_node_content.inc on line 7.
  • strict warning: Declaration of views_handler_argument::init() should be compatible with views_handler::init(&$view, $options) in /home/lesbisyg/public_html/sites/default/modules/views/handlers/views_handler_argument.inc on line 32.
  • strict warning: Declaration of views_handler_filter::options_validate() should be compatible with views_handler::options_validate($form, &$form_state) in /home/lesbisyg/public_html/sites/default/modules/views/handlers/views_handler_filter.inc on line 26.
  • strict warning: Declaration of views_handler_filter::options_submit() should be compatible with views_handler::options_submit($form, &$form_state) in /home/lesbisyg/public_html/sites/default/modules/views/handlers/views_handler_filter.inc on line 26.
  • strict warning: Declaration of views_plugin_row::options_validate() should be compatible with views_plugin::options_validate(&$form, &$form_state) in /home/lesbisyg/public_html/sites/default/modules/views/plugins/views_plugin_row.inc on line 24.
  • strict warning: Declaration of views_plugin_row::options_submit() should be compatible with views_plugin::options_submit(&$form, &$form_state) in /home/lesbisyg/public_html/sites/default/modules/views/plugins/views_plugin_row.inc on line 24.
  • strict warning: Non-static method view::load() should not be called statically in /home/lesbisyg/public_html/sites/default/modules/views/views.module on line 906.
  • strict warning: Declaration of views_plugin_style_default::options() should be compatible with views_object::options() in /home/lesbisyg/public_html/sites/default/modules/views/plugins/views_plugin_style_default.inc on line 13.
  • strict warning: Non-static method view::load() should not be called statically in /home/lesbisyg/public_html/sites/default/modules/views/views.module on line 906.
  • strict warning: Declaration of date_api_filter_handler::value_validate() should be compatible with views_handler_filter::value_validate($form, &$form_state) in /home/lesbisyg/public_html/sites/default/modules/date/includes/date_api_filter_handler.inc on line 15.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.
  • strict warning: Only variables should be passed by reference in /home/lesbisyg/public_html/sites/default/modules/date/date_api.module on line 866.

Flaggermustur

Konsentrert lytting etter flaggermuslyder. Flaggermusekspert Kari Rigstad fra Norsk Zoologisk Forening for anledningen i gips og rullestol. Foto: Rine G. Carlsen

Det var ti nysgjerrige damer som møttes ved Østensjøvannet ved solnedgang en kveld i september. Vi tuslet ut i mørket sammen med flaggermusekspert Kari Rigstad fra flaggermusgruppa i Norsk zoologisk forening. Etter en kort spasertur langs vannet, stoppet vi i mørket inne i småskogen. Ivrige lyttere spurte villig vekk om alt mulig knyttet til flaggermus, og eksperten snakket i vei. Riktig så hyggelig, der i mørket.

Så kom de som bestilt: Flaggermusene. Små dvergflaggermus dukket opp mellom trærne, og suste rundt på jakt etter insekter. Rundt omkring i mørket, og av og til innom lyset fra lyktene våre. Med tydelig flaggermussiluett var de lett å gjenkjenne. Og detektoren viste 30 kHz, altså dvergflaggermus. Jo høyere frekvens, jo mindre art. Detektoren ”oversetter” fra flaggermuslyd til hørbar lyd.

Ti meter ut av småskogen dukket det opp to andre arter mot himmelen; nordflaggermus og storflaggermus. Den ene fløy høyere enn den andre, de kunne skilles på atferd og ved hjelp av lyddetektoren til eksperten. Ofte kan en fjerde art ses ved Østensjøvannet: vannflaggermus. Den kjennes ved at den flyr lavt lavt over vannet på jakt etter insekter. Men ikke denne kvelden, da var det for mye tåke over vannet, og det liker de ikke.

Flaggermusdetektor. Tallet i displayet oppgir lydstyrken på flaggermusas "ekkolodd-lyd" i hz. Foto: Rine G. Carlsen

Etter et par timer, gikk vår lille gruppe fornøyd tilbake til bilene. Litt klokere om disse små hårete og bevingede skapningene som de fleste ikke vet noe særlig om. Kanskje var noen blitt inspirert til å bygge flaggermuskasser når de kom hjem? En morsom kveld!

De som var med: Rine, Nina, Ragnhild, Turid, Cathrine, Kari, Renate, Turid, Jannicke og Jorun.

Mer informasjon fra flaggermusgruppa i Norsk zoologisk forening.

2006

Bildegalleri

Klikk på et bilde for å forstørre. Bruk piltaster eller trykk i høyre/venstre del av bildet for å få opp hhv neste eller forrige bilde.

  • Konsentrert lytting etter flaggermuslyder. Flaggermusekspert Kari Rigstad.
  • Flaggermusdetektor. Tallet i displayet oppgir lydstyrken.