In the current Japanese Upper Secondary School National Curriculum Standard, biodiversity is one of the main learning topics in biological subjects, particularly in Basic Biology. As part of a study on teaching biodiversity in upper secondary school biology classes, we examined the treatment of biodiversity-related contents and terminology in currently used ten Basic Biology textbooks and five Advanced Biology textbooks. There were considerable differences in content about biodiversity, its frequency, and the terms used in these textbooks. In Basic Biology textbooks, 7 - 17% of the 150 - 240 text pages were allocated to biodiversity-related contents. Most textbooks covered all categories which Sakir and Kim (2021) proposed. The number of biodiversity-related terms in each textbook ranged from 41 - 71, of which 20 - 44 were listed in the index, and 8 - 18 were treated as key terms. Key terms common to most textbooks were biodiversity, species diversity, alien species, endangered species, extinction, ecosystem services, and environmental impact assessment. In the Advanced Biology textbooks, the pages allocated to biodiversity-related contents were only 2 - 5% of the 270 - 428 text pages. Some of these textbooks were missing some of Sakir and Kim's categories. The number of biodiversity-related terms in each textbook ranged from 33 - 56, of which 14 - 28 were listed in the index, and 7 - 13 were treated as key terms. Examples of major key terms used in Advanced Biology textbooks included biodiversity, genetic diversity, species diversity, ecosystem diversity, disturbance, Allee’s effect, inbreeding depression, vortex of extinction, and ecosystem services. Based on our findings, we argue that textbook editors/authors need to give more consideration to contents, terminology, and the arrangement of topics pertaining to biodiversity to help students fully understand the importance of biodiversity conservation.
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