我有以下数据框：
>part_individual
AATGG
unit "AATGG"
human_female "980993"
human_male "1150320"
bonobo_female "2674508"
bonobo_male "3121386"
chimpanzee_female "642629"
chimpanzee_male "514293"
gorilla_female "4459693"
gorilla_male "3430239"
orangutan_female "2839394"
orangutan_male "3251095"
gibbon_female "106825.4"
gibbon_male "147886.3"
skewed_human "1.17"
skewed_bonobo "1.17"
skewed_chimpanzee "0.8"
skewed_gorilla "0.77"
skewed_orangutan "1.14"
skewed_gibbon "1.38"
如您所见，第一行是多余的。但是，我无法弄清楚如何在保持数据帧结构的同时将其删除。使用此命令删除第一行后：
part_individual = part_individual [-1，]
结构被破坏了：
human_female human_male bonobo_female bonobo_male chimpanzee_female chimpanzee_male
"980993" "1150320" "2674508" "3121386" "642629" "514293"
gorilla_female gorilla_male orangutan_female orangutan_male gibbon_female gibbon_male
"4459693" "3430239" "2839394" "3251095" "106825.4" "147886.3"
skewed_human skewed_bonobo skewed_chimpanzee skewed_gorilla skewed_orangutan skewed_gibbon
"1.17" "1.17" "0.8" "0.77" "1.14" "1.38"
我怎么能避免这种行为？