Ijenali:Ibhayoloji yamanzi acocekileyo, 64(6), iphe.1183-1195.
Iintlobo (zeentaka):Ihansi yeembotyi (Anser fabalis), Ihansi emhlophe engaphantsi (Anser erythropus)
Isishwankathelo:
Izinga elikhawulezayo lotshintsho olubangelwa ngabantu lubangela umngeni omkhulu kwizilwanyana zasendle. Amandla ezilwanyana zasendle okuziqhelanisa notshintsho oluhambelana nokusingqongileyo anemiphumo ebalulekileyo empilweni yazo, ukusinda kwazo, kunye nokuzala kwazo. Ukuguquguquka kokuziphatha, ukulungiswa kwangoko kokuziphatha ngenxa yokuguquguquka kokusingqongileyo, kunokuba yinto ebalulekileyo ekuhlangabezaneni notshintsho oluvela kubantu. Injongo ephambili yolu phononongo yayikukulinganisa impendulo yeentlobo ezimbini zehashe zasebusika (ihashe leembotyi i-Anser fabalis kunye nehashe elimhlophe elingaphantsi elingaphantsi i-Anser erythropus) kwimeko embi yokuhlala kwinqanaba labemi ngokufunda ukuziphatha kokufuya. Ukongeza, sivavanye ukuba i-behavioral plasticity ingayitshintsha na i-trophic niche. Sichaze ukuziphatha kokufuya kwaye sabala uluhlu lwasekhaya lwemihla ngemihla (HR) lwamahashe sisebenzisa idatha yokulandelela inkqubo yokuma komhlaba jikelele. Sibale iindawo ezisemgangathweni ze-ellipse ukuze silinganise ububanzi be-niche sisebenzisa amaxabiso e-δ13C kunye ne-δ15N amahashe ngamanye. Sidibanise i-behavioral plasticity nomgangatho wendawo yokuhlala sisebenzisa iimodeli ze-ANCOVA (uhlalutyo lwe-covariance). Sikwavavanye unxibelelwano phakathi kweendawo ezisemgangathweni ze-ellipse kunye ne-HR sisebenzisa imodeli ye-ANCOVA. Sifumene umahluko omkhulu kwindlela amahansi aziphatha ngayo xa ekhangela ukutya phakathi kweminyaka kwindawo yawo yokutya yemihla ngemihla, umgama wokuhamba kunye nesantya, kunye ne-engile yokujika. Ngokukodwa, iintaka zandisa indawo yazo yokutya ukuze zanelise iimfuno zazo zamandla zemihla ngemihla ngenxa yeemeko ezimbi zokuhlala. Zazibhabha kakhulu kwaye zihamba imigama ekhawulezayo nemide imihla ngemihla. Kwihansi elimhlophe elisengozini yokuphela, zonke izinto eziguquguqukayo zokuziphatha zazinxulunyaniswa nomgangatho wendawo yokuhlala. Kwihansi leembotyi, yi-HR kuphela kunye ne-engile yokujika eyayinxulumene nomgangatho wendawo yokuhlala. Iintaka, ngakumbi ihansi elimhlophe elingaphantsi, zisenokuba zazikwindawo ephezulu ye-trophic phantsi kweemeko ezimbi. Iziphumo zethu zibonisa ukuba amahansi asebusika abonise izinga eliphezulu lokuziphatha. Nangona kunjalo, ukuziphatha okusebenzayo ngakumbi kwe-trophic phantsi kwemeko embi yokuhlala akuzange kukhokelele kwindawo ebanzi ye-trophic. Ukufumaneka kwendawo yokuhlala kunokuba noxanduva lweempendulo ezahlukeneyo ze-HR ye-trophic kunye ne-isotopic niche kutshintsho olubangelwa ngabantu kwindalo esingqongileyo. Ke ngoko, ukugcina iindlela zendalo zamanzi ngexesha elibalulekileyo (oko kukuthi, uSeptemba-Novemba) ukuqinisekisa ukuba izixhobo zokutya ezisemgangathweni ziyafumaneka kubalulekile kwikamva lamaqela amahansi ngaphakathi kwe-East Asian-Australasian Flyway.
IMPAPASHO IYAFUMANEKA KWI:
https://doi.org/10.1111/fwb.13294
