2026 年 18 巻 p. 10-
The present paper reports on the terms related to native, alien, endangered, and invasive species that appear in Unit 5, "Ecology and the Environment" of five currently used Advanced Biology textbooks as well as organisms, particularly endangered species and invasive alien species, that appear in the unit. There was a considerable variation in the treatment of these terms among the five textbooks surveyed. However, definitions and explanations of these terms were absent or generally insufficient. Regarding organisms’ names, a total of 39 extinct or endangered species were found in the unit in the five textbooks, of which 17 were native to Japan. The number of extinct or endangered species listed in each textbook varied considerably, ranging from one to 18. Furthermore, some species were covered in topics unrelated to species extinction or biodiversity conservation or were not explicitly stated as endangered. The organisms listed in these textbooks were mostly animal species, with a predominance of mammal, and most appeared in only one textbook. Invasive alien species relevant to biodiversity conservation, on the other hand, were only listed in two textbooks, with nine for Japan and three for overseas. Most of these species were also listed in Basic Biology textbooks.
