Matakan ruwa yana rinjayar samar da mafi kyawun wuraren ciyarwa don barazanar tsuntsayen ruwa masu ƙaura

Jarida:Ilimin halitta da juyin halitta, 7 (23), shafi 10440-10450.

Nau'o'i (Avian):Babban Goose mai farar fata (Anser albifrons), Goose Aswan (Anser cygnoides)

Takaitawa:

Filayen dausayi mai faɗi a tafkin Poyang, wanda aka ƙirƙira ta hanyar sauye-sauye na yanayi a matakin ruwa, ya zama babban wurin hunturu na Anatidae na ƙaura a China. Ragewar da aka samu a yankin dausayi a cikin shekaru 15 da suka gabata ya haifar da shawarwarin gina madatsar ruwa ta Poyang don kiyaye yawan ruwan sanyi a cikin tafkin. Canza tsarin yanayin ruwa na halitta zai shafi tsuntsayen ruwa wanda ya dogara da canjin matakin ruwa don samun abinci da samun dama. Mun bin diddigin nau'ikan Goose guda biyu tare da halaye daban-daban na ciyarwa (mafi girma farin gaban geese Anser albifrons [nau'in kiwo] da swan geese Anser cygnoides [jinin ciyar da tuber]) a lokacin hunturu biyu tare da daidaita matakan ruwa (ci gaba da koma bayan tattalin arziki a cikin 2015; ci gaba da ci gaba da ruwa a cikin 2016, ci gaba da babban ruwa a cikin 2016) zaɓin wurin zama bisa ciyayi da tsayi. A cikin 2015, geese masu farar fata da yawa sun yi amfani da su ta hanyar ƙirƙira laka, suna ciyar da gajerun swards na graminoid mai gina jiki, yayin da swan geese ke tono abubuwan da ke gefen ruwa don tubers. Wannan mahimmancin ecotone mai ƙarfi a jere yana fallasa abinci na cikin ruwa kuma yana tallafawa haɓakar matakin farko na graminoid yayin koma bayan matakin ruwa. A lokacin ci gaba da matakan ruwa masu tsayi a cikin 2016, duka nau'ikan sun zaɓi laka, amma kuma zuwa mafi girman matsayi na mazaunin tare da tsayin daka na graminoid swards saboda samun damar zuwa tubers da sabon ci gaban graminoid an iyakance shi ƙarƙashin yanayin ruwa mai girma. Tsawon kafa graminoid swards yana ba da abinci mai ƙarancin riba mai kuzari ga nau'ikan biyu. Matsakaicin raguwa a cikin mazaunin da ya dace da tsarewa zuwa ƙarancin fa'ida ta matakan ruwa mai yuwuwa zai iya rage ikon geese don tara isassun shagunan mai don ƙaura, tare da yuwuwar tasirin tasirin rayuwa da haifuwa na gaba. Sakamakonmu yana ba da shawarar cewa ya kamata a kiyaye manyan matakan ruwa a tafkin Poyang a lokacin bazara, amma a ba da izinin koma baya a hankali, yana fallasa sabbin wurare a duk lokacin hunturu don ba da dama ga tsuntsayen ruwa daga duk guilds masu ciyarwa.