Daisuke Akaishi

Abstract Mountain streamwater chemistry is an effective indicator of forest condition. In 2022, we conducted a nationwide investigation of mountain streamwater chemistry in Japan, leveraging citizen‐participatory sampling. This approach involved 629 individuals with regular exposure to mountain and natural environments. Although our primary aim was to sample at locations from a 2003 study, we also welcomed samples from new sites. In total, 1414 streamwater samples were collected one time from each forested watershed at the baseflow condition. Our study focused on stream nitrate (NO₃⁻) concentration as a key indicator of anthropogenic nitrogen (N) loading impacts on forests. We compared NO₃⁻ concentrations in 2022 with those from 2003 at identical sampling points. After excluding 179 points with evident human‐created features upstream, the mean NO₃⁻ concentration in 2022 was 0.328 mg N L⁻¹ (n = 1236). Comparing data from 1088 points sampled in both years, the mean value in 2022 (0.324 mg N L⁻¹) was significantly lower than that in 2003 (0.359 mg N L⁻¹, p < 0.05). Notably, 88.5% of sampling points showed differences within ±0.25 mg N L⁻¹. The spatial distribution pattern of mountain stream NO₃⁻ concentrations in 2022 did not consistently align with large cities, industrial areas, or N deposition sources. This unique approach marked the first nationwide participatory survey for collecting mountain streamwater in Japan. Our success in ensuring sample quality through accessible explanations, manuals, and videos demonstrates the potential of citizen science. However, the quantitative evaluation of scientific accuracy remains a forthcoming challenge.

昨年度の金沢大学資料館紀要で、自然科学研究科の新校舎への移転に際して四高時代のきのこの蝋模型が発見され、角間の里記念館を経て金沢大学資料館に移管されることになった経緯を書いた。そして、蝋模型の多くが当時の皮膚科で教育用に作られた皮膚ムラージュと同様の技法で作られていること、東京大学医学部にも同じ標本が保存されていたこと、金沢大学への導入者はドクササコの新種記載を行った事で知られる理学部の市村塘であることが明らかになった。しかし、蝋模型の制作者と、それに続く金沢大学への流入経路が謎として残った。今回、引き続き全国的な調査を継続した中で、民間の教育標本制作者である山越長七郎が中心人物として浮かび上がり、東京大学医学部と密な接触があったことに加え、東大と四高のきのこ蝋模型の製作者であったことが明らかになったので、ここに報告する。

金沢大学医薬保健研究域保健学系

From 2001 to 2003, adults of Muscina angustifrons (Loew) were bred from 38 macrofungal species collected from a broad-leaved secondary forest, predominated with two oak species, Quercus serata and Q. variabilis, surrounding the campus of Kanazawa University, Kanazawa city, Ishikawa Prefecture, Japan. This fly species was reared most often from a macrofungal species belonging to the families of Russulaceae, Amanitaceae and Boletaceae that produce large fruit-bodies. The fly emerged from June to September with a peak in July, synchronizing its appearance period with that of the host macrofungi.