Direktlänk till inlägg 26 januari 2011

Stajlade hem visar styrka hos glada

Av Lars Overmars - 26 januari 2011 09:22

Fågelforskare närstuderade fågelbon i ett område i Spanien där det lever gott om bruna glador.

De upptäckte att flagor av vit plast från påsar och annat skräp i bona var allmänt vedertagna signaler fåglarna emellan.

Av någon anledning gällde det bara den bruna gladan. Och bara de fåglar som var i medelåldern då de är som friskast och starkast. Yngre och äldre struntade i hemstajlning.

Forskarna undersökte 127 bon. De räknade antalet ungar, noterade hur stora respektive revir tycktes vara och hur mycket andra fåglar försökte närma sig bona.

De jämförde det med mängden vita plastbitar i respektive bo och fann klara samband.

Ju mer vit plast, desto vanligare var det med två tre ungar i boet, desto större tycktes reviren vara och desto färre oönskade besök dök upp (ner).

För att undersöka fenomenet närmare strödde forskarna ut plastremsor i landskapet. Gröna, genomskinliga och vita.

Av 33 fågelpar som nappade på erbjudandet och tog med sig plastremsor valde 29 enbart vita. De ger tydligast signal.

Och signalen är entydig: styrka. Mycket pynt visar att här finns en stark motståndare som det inte lönar sig att ge sig på.

Att paren får fler ungar beror förstås både på att de faktiskt är starkare och friskare och på att bona med ungarna attackeras av andra mer sällan, berättar den spanske ekologen Fabrizio Sergio i tidskriften Science.

Att fåglar pyntar bon på andra sätt är känt sedan tidigare. En nordafrikansk sångfågel stoppar till exempel in stenar i boets väggar för att visa sig musklig.

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    Kom ihåg mig



Av Lars Overmars - 26 januari 2011 09:24

Till helgen slår det privata företaget Carspect upp portarna för sin nya besiktningsstation vid Svågertorp i Malmö. Inom en månad öppnar företaget stationer även i Hässleholm, Kristianstad och i Fosie i Malmö. Därmed blir det för första gången konk...

Av Lars Overmars - 26 januari 2011 09:23

Vi har ett system för asylsökande, men jag tycker att man kan förvänta sig att alla ska ha den vård som vi andra får. Rent ekonomiskt tror jag att det blir en vinst för oss, säger Anders Åkesson. Han menar att det idag finns stora gränsdragningspro...

Av Lars Overmars - 26 januari 2011 09:22

Det är återigen den nordatlantiska oscillationen (NAO) som lämnar öppet för ny polarkyla att strömma ner över oss. Sedan någon vecka har den varit mer gynnsam för det skandinaviska vädret, vilket märks på den senaste tidens plusgrader. Men snart ...


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