Kukula n'kofunika: abakha okhala m'nyengo yozizira amakhala nthawi yayitali ndipo amakhala ndi malo ochepa okhala m'nyanja zazikulu kwambiri zaku China.

Magazini:Kafukufuku wa Avian, 10(1), tsamba 1-8.

Mitundu (ya mbalame):Nsomba ya ku Eurasian wigeon (Mareca penelope), Bakha wokhotakhota (Mareca falcata), Northern pintail (Anas acuta)

Chidule:

Umboni ukusonyeza kuti mbalame zam'madzi zomwe zimakhala m'nyengo yozizira zakhala zikuchulukirachulukira m'nyanja ziwiri zazikulu kwambiri za Mtsinje wa Yangtze, East Dong Ting Lake (Hunan Province, 29°20′N, 113°E) ndi Poyang Lake (Jiangxi Province, 29°N, 116°20′E), poyerekeza ndi nyanja zina, ngakhale kuti pali malo ena osungiramo nyama. Ngakhale kuti ubalewu mwina ukuchitika chifukwa cha malo ambiri osasokonezeka m'nyanja zazikulu, sitikumvetsa zambiri za zomwe zimayambitsa khalidwe la munthu aliyense zomwe zimayambitsa izi. Tinafufuza mayendedwe a mitundu itatu ya abakha m'nyengo yozizira (Eurasian Wigeon Mareca penelope, Falcated Duck M. falcata ndi Northern Pintail Anas acuta) pogwiritsa ntchito ma GPS transmitter, kuwunika kusiyana pakati pa nyanja ziwiri zazikulu ndi nyanja zina zazing'ono zomwe zimagwiritsidwa ntchito m'malo okhala abakha, nthawi yomwe amakhala panyanja iliyonse komanso mtunda watsiku ndi tsiku womwe mbalame zomwe zatchulidwazo zimasuntha pamalowa. Bakha wa ku Eurasian Wigeon ndi Falcated anakhala nthawi yayitali kasanu ndipo pafupifupi ankagwiritsa ntchito malo okhala zachilengedwe m'nyanja ziwiri zazikulu (91‒95% ya malo) poyerekeza ndi nthawi yomwe anakhala m'nyanja zazing'ono, komwe anakhala masiku 28‒33 pa avareji (kupatula malo omwe anagwidwa) ndipo ankagwiritsa ntchito malo okhala osiyanasiyana (kuphatikizapo pafupifupi 50% kunja kwa nyanja). Kafukufuku wathu ndi woyamba kusonyeza kuti nthawi yochepa yokhala ndi bakha komanso kugwiritsa ntchito malo okhala osiyanasiyana ndi bakha m'nyanja zazing'ono kungathandize kufotokoza kuchuluka kwa mitundu iyi ndi zina zomwe zilipo m'nyanja zazikulu kwambiri m'zaka zaposachedwa. Izi zikufanana ndi kuchepa kwa kuchuluka kwawo m'nyanja zazing'ono, komwe kutayika ndi kuwonongeka kwa malo okhala kwawonekera kwambiri kuposa m'nyanja zazikulu.