Ubungakanani bamanzi buchaphazela ukufumaneka kweendawo ezifanelekileyo zokutya kwiintaka zasemanzini ezisengozini yokufuduka

Ijenali:I-Ecology kunye nokuguquka kwezinto, 7(23), iphe.10440-10450.

Iintlobo (zeentaka):Ihansi enkulu emhlophe engaphambili (iAnser albifrons), ihansi yaseAswan (iAnser cygnoides)

Isishwankathelo:

Iindawo ezimanzi ezinde zexesha elifutshane kwiLake Poyang, ezidalwe lutshintsho olukhulu lwexesha lonyaka kwinqanaba lamanzi, zezona ndawo ziphambili zasebusika zeAnatidae ezifudukayo eTshayina. Ukuncipha kwendawo enamanzi kwiminyaka eli-15 edlulileyo kukhokelele kwiziphakamiso zokwakha iDama lasePoyang ukugcina amanqanaba aphezulu amanzi asebusika ngaphakathi kwechibi. Ukutshintsha inkqubo yendalo yamanzi kuya kuchaphazela iintaka zamanzi ezixhomekeke kutshintsho lwamanzi ngokufumaneka kokutya nokufikeleleka. Silandele iintlobo ezimbini zeehansi ezineendlela ezahlukeneyo zokutya (iihansi ezinkulu ezimhlophe eziphambi kwazo iiAnser albifrons [iintlobo zezilwanyana ezitya amadlelo] kunye neehansi ze-swan iiAnser cygnoides [iintlobo zezilwanyana ezitya amadlelo]) ngexesha lasebusika ezimbini ezinamanqanaba amanzi ahlukeneyo (ukwehla koqoqosho okuqhubekayo ngo-2015; amanzi ahlala ephezulu ngo-2016, afana nalawo aqikelelweyo emva kweDama lasePoyang), siphanda imiphumo yotshintsho lwamanzi ekukhetheni indawo yazo yokuhlala ngokusekelwe kwizityalo kunye nokuphakama. Ngowama-2015, iihansi ezimhlophe zasebenzisa kakhulu iindawo ezimdaka ngokulandelelana, zisitya ii-graminoid swards ezimfutshane ezinesondlo, ngelixa iihansi ze-swan zazigrumba iindawo ezingaphantsi kwamanzi ukuze zifumane ii-tubers. Le ecotone ibalulekileyo ibonakalisa ukutya okungaphantsi kwamanzi ngokulandelelana kwaye ixhasa ukukhula kwe-graminoid kwinqanaba lokuqala ngexesha lokwehla kwamandla amanzi. Ngexesha lamanqanaba aphezulu amanzi ngo-2016, zombini ezi ntlobo zakhetha iindawo ezimdaka, kodwa nakwinqanaba elikhulu leendawo zokuhlala ezine-graminoid swards zexesha elide ezisele zikho kuba ukufikelela kwii-tubers kunye nokukhula okutsha kwe-graminoid kwakuthintelwe phantsi kweemeko zamanzi aphezulu. Ii-graminoid swards ezisele zikho zibonelela nge-food enenzuzo encinci kuzo zombini ezi ntlobo. Ukunciphisa kakhulu indawo yokuhlala efanelekileyo kunye nokuvalelwa kwindawo enenzuzo encinci ngamanqanaba aphezulu amanzi kunokwenzeka ukuba kunciphise amandla eehansi okuqokelela amafutha aneleyo okufuduka, kunye nemiphumo enokubakho yokuthwala emva koko ekusindeni nasekuzaleni. Iziphumo zethu zibonisa ukuba amanqanaba aphezulu amanzi kwiLake Poyang kufuneka agcinwe ehlotyeni, kodwa avunyelwe ukuba anciphe kancinci kancinci, nto leyo eveza iindawo ezintsha ebusika ukuze iintaka zamanzi ezivela kuzo zonke iintlangano zokutya zikwazi ukufikelela.