Izinga lamanzi lithinta ukutholakala kwezindawo zokudla ezifanele zezinyoni zasemanzini ezisengozini

Ijenali:I-Ecology and evolution, 7(23), pp.10440-10450.

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

Abstract:

Amaxhaphozi amaningi e-ephemeral e-Poyang Lake, adalwe izinguquko ezimangalisayo zesizini ezingeni lamanzi, akha indawo yasebusika eyinhloko ye-Anatidae efudukayo e-China. Ukwehliswa kwendawo engamaxhaphozi phakathi neminyaka eyi-15 edlule kuye kwaholela eziphakamisweni zokwakha Idamu lasePoyang ukuze kugcinwe amazinga aphezulu amanzi asebusika echibini. Ukushintsha uhlelo lwemvelo lokusebenzisa amanzi emanzini kuzothinta izinyoni zasemanzini okuncike ekushintsheni kwezinga lamanzi ngokutholakala kokudla nokufinyeleleka. Silandelele izinhlobo ezimbili zamahansi anendlela ehlukile yokudla (amahansi amakhulu amhlophe angaphambili ama-Anser albifrons [uhlobo lwamadlelo] kanye namahansi ama-Anser cygnoides [uhlobo lwe-tuber-feeding]) phakathi nobusika obubili obunamazinga amanzi ahlukene (ukwehla komnotho okuqhubekayo ngo-2015; ukusimama kwamanzi aphezulu ngo-2016, okufana naleyo miphumela ebikezelwe ye-Dam-Poyang yokushintsha kwendawo yase-Dam ezitshalweni nasekuphakameni. Ngo-2015, amahansi amhlophe ngaphambili axhaphaza kakhulu ama-mudflats adalwe ngokulandelana, edla ama-graminoid amafushane anomsoco, kuyilapho amahansi emba ama-substrates onqenqemeni lwamanzi ukuze athole izilimo eziyizigaxa. Le ecotone ebalulekile eguqukayo iveza ngokulandelana ukudla okusemanzini futhi isekela ukukhula kwe-graminoid kwesigaba sangaphambi kwesikhathi ngesikhathi sokwehla kwezinga lamanzi. Phakathi namazinga aphezulu amanzi aqhubekayo ngo-2016, zombili lezi zinhlobo zakhetha izindawo zokuhlala ezinodaka, kodwa futhi ngezinga elikhulu lezindawo zokuhlala ezinezinhlamvu ze-graminoid zesizini ngenxa yokuthi ukutholakala kwezilimo eziyizigaxa kanye nokukhula okusha kwe-graminoid kwakuvinjelwe ngaphansi kwezimo zamanzi aphezulu. Ama-graminoid sward asenesikhathi eside asungulwe anikeza ifolishi enenzuzo encane enamandla kuzo zombili lezi zinhlobo. Ukuncipha okukhulu kwendawo yokuhlala efanelekile kanye nokuvaleleka ekudleni okunenzuzo encane ngamazinga aphezulu amanzi kungenzeka kunciphise ikhono lamahansi lokuqongelela izitolo zamafutha ezanele ukuze zifuduke, kube nemithelela engase ibe khona ekusindeni nasekuzaleni okulandelayo. Imiphumela yethu iphakamisa ukuthi amazinga aphezulu amanzi e-Poyang Lake kufanele agcinwe ehlobo, kodwa avunyelwe ukuthi ehle kancane kancane, okuveza izindawo ezintsha phakathi nobusika bonke ukuze kuhlinzekwe ukufinyelela kwezinyoni zamanzi kuzo zonke izinhlangano eziphakelayo.