Izinga lamanzi lithinta ukutholakala kwezindawo zokudla ezifanele zezinyoni zasemanzini ezisengozini yokufuduka

Ijenali:I-Ecology kanye nokuziphendukela kwemvelo, 7(23), amakhasi 10440-10450.

Izinhlobo (zezinyoni):Ihansi elimhlophe elingaphambili elikhulu (i-Anser albifrons), ihansi lase-Aswan (i-Anser cygnoides)

Isifinyezo:

Izindawo ezimanzi ezinde zesikhashana eLake Poyang, ezidalwe izinguquko ezinkulu zesizini ezingeni lamanzi, zakha indawo eyinhloko yobusika ye-Anatidae efudukayo eShayina. Ukuncipha kwendawo enamanzi eminyakeni eyi-15 edlule kuholele eziphakamisweni zokwakha iDamu lasePoyang ukuze kugcinwe amazinga aphezulu amanzi asebusika ngaphakathi kwechibi. Ukushintsha uhlelo lwemvelo lwamanzi kuzothinta izinyoni zamanzi ezincike ekushintsheni kwezinga lamanzi ngokutholakala kokudla nokufinyeleleka. Silandele izinhlobo ezimbili zamahansi ezinemikhuba ehlukene yokudla (amahansi amakhulu amhlophe angaphambili i-Anser albifrons [izinhlobo zegrazing] kanye namahansi e-swan i-Anser cygnoides [izinhlobo ze-tuber-feeding]) phakathi nobusika obubili obunamazinga amanzi ahlukene (ukwehla komnotho okuqhubekayo ngo-2015; amanzi aphezulu ngo-2016, afana nalawo abikezelwe ngemva kweDamu lasePoyang), siphenya ngemiphumela yokushintsha kwezinga lamanzi ekukhetheni kwawo indawo yokuhlala ngokusekelwe ezitshalweni nasekuphakameni. Ngo-2015, amahansi amhlophe asebenzisa kakhulu ama-mudflats ngokulandelana, edla ama-graminoid swards amafushane anomsoco, kuyilapho amahansi e-swan emba ama-substrate eceleni kwamanzi ukuze athole ama-tubers. Le ecotone ebalulekile eguquguqukayo iveza ukudla okungaphansi kwamanzi ngokulandelana futhi isekela ukukhula kwe-graminoid esigabeni sokuqala ngesikhathi sokwehla kwamandla amanzi. Ngesikhathi samazinga aphezulu amanzi ngo-2016, zombili izinhlobo zakhetha ama-mudflats, kodwa futhi nasezingeni elikhulu lezindawo zokuhlala ezinama-graminoid swards asezinkathini ezinde ngoba ukufinyelela kuma-tubers nokukhula okusha kwe-graminoid kwakuvinjelwe ngaphansi kwezimo zamanzi amaningi. Ama-graminoid swards asezinkathini ezinde anikeza ukudla okungenayo inzuzo enamandla kuzo zombili izinhlobo. Ukunciphisa okukhulu indawo yokuhlala efanele kanye nokuvalelwa ekudleni okungenayo inzuzo kakhulu ngamazinga aphezulu amanzi cishe kuzonciphisa ikhono lamahansi lokuqoqa izitolo zamafutha ezanele zokufuduka, kanye nemiphumela engaba khona ekusindeni nasekuzaleni okulandelayo. Imiphumela yethu iphakamisa ukuthi amazinga aphezulu amanzi eLake Poyang kufanele agcinwe ehlobo, kodwa avunyelwe ukuthi anciphe kancane kancane, okuveza izindawo ezintsha phakathi nobusika ukuze kutholakale ukufinyelela kwezinyoni zamanzi ezivela kuzo zonke izinhlangano zokudla.