Inkomba entsha esekwe kwisathelayithi yokuhlonza izindawo zokudla ze-spatiotemporal zezinyoni zasemanzini ezidla uhlaza.

Ijenali:I-Ecological Indicators, 99, pp.83-90.

Izinhlobo (Izinyoni):Ihansi elikhulu elingaphambili elimhlophe (Anser albifrons)

Abstract:

Ukusatshalaliswa kwemithombo yokudla kuyisici esibalulekile ekukhetheni indawo yokuhlala. Izinyoni zasemanzini ezidla uhlaza zithanda izitshalo ezikhula zikhula ngokushesha (kusukela ekuqaleni kokukhula kwezitshalo kuya esiqongweni se-nutrient biomass) njengoba lezi zinikeza amazinga aphezulu okudla amandla. Lesi sigaba sokuthuthukiswa kwezitshalo asithathwa ngokugcwele yizinkomba zezitshalo ezitholakala kwisathelayithi ezivame ukusetshenziswa, ezigxile ku-biomass yezitshalo (isb., I-Enhance Vegetation Index, i-EVI) noma ukukhula kwezitshalo okusebenzayo (isb, umehluko we-EVI phakathi kwedethi yamanje nedlule, i-diffEVI). Ukuthuthukisa ukumepha izindawo ezifanele zamadlelo ezinyoni zasemanzini ezidla uhlaza, siphakamisa inkomba entsha yokukhula kwezitshalo esekwe kusathelayithi yokukhula kwezitshalo zesigaba sangaphambi kwesikhathi (ESPG). Sicabanga ukuthi izinyoni zasemanzini ezidla uhlaza zithanda izitshalo ezisanda kukhula ngesikhathi sokukhula bese sikhetha izitshalo ezinokuphela kwesikhathi kwe-ESPG phakathi nenkathi engakhuli. Sisebenzisa idatha yokulandelela ngesathelayithi yamahansi amakhulu angu-20 angaphambili amhlophe (Anser albifrons) ebusika e-Yangtze River floodplain ukuze siqinisekise ukuqagela kwethu. Sakha amamodeli aqondile ajwayelekile okusabalalisa ihansi phakathi nezinkathi ezikhulayo nezingakhuli futhi siqhathanise ukusebenza kwe-ESPG nezikhombisi zokukhula kwezitshalo ezivame ukusetshenziswa (EVI kanye ne-diffEVI). Ngesikhathi sokukhula, i-ESPG ingachaza u-53% wokuhluka ekusabalaliseni ihansi, i-EVI esebenza kahle kakhulu (27%) kanye ne-diffEVI (34%). Phakathi nesizini engakhuli, ukuphela kwe-ESPG kuphela okuthonya kakhulu ukusatshalaliswa kwehansi, okuchaza u-25% wokuhluka (ESPG: AUC = 0.78; EVI: AUC = 0.58; diffEVI: AUC = 0.58). Inkomba esanda kuthuthukiswa yezitshalo i-ESPG ingase isetshenziselwe ukuthuthukisa izinhlobo zokusatshalaliswa kwezinyoni zamanzi ezidla uhlaza futhi ngaleyo ndlela kusekelwe imizamo yokongiwa kwezinyoni zasemanzini nokuphathwa kwamaxhaphozi.