ðɪs wʌz pɹˈɑːbəbli kˈɔːzd baɪ ˌoʊvɚpˈʌmpɪŋ ʌvðə ɡɹˈaʊnd wˈɔːɾɚ, wˌɪtʃ hɐz lˈɛd ðɪ ˈʌndɚɡɹˌaʊnd lˈeɪk tə ʃɹˈɪŋk, ænd wɪð ɪt ðə fˈuːd səplˈaɪ tə dwˈɪndəl.
This was probably caused by overpumping of the ground water, which has led the underground lake to shrink, and with it the food supply to dwindle.