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ノーベル化学賞の吉野さん 理事長務める大阪の研究施設に出勤

ノーベル化学賞に選ばれた吉野彰さんが、受賞決定後初めて、自身が理事長を務める大阪府内のリチウムイオン電池の研究施設に出勤し、研究への変わらぬ意欲を示しました。

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Complex relationship between the diversity and stability of chironomid assemblages in the recent sediments of two large alpine lakes in SW China.

著者 Zheng W , Wang R , Zhang E , Chang J
Sci Total Environ.2019 May 24 ; 684():705-714.
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There is no doubt that the diversity and stability of freshwater ecosystems have suffered dramatic changes as a result of intensified human activities. However, the relationship between community diversity and stability is still debated. In this study, we used biological and geochemical records from the recent sediments of two lakes to test the hypothesis that different aspects of the diversity of the chironomid community have different relationships with community stability. Yangzong Lake (YZ) and Chenghai Lake (CH) are large and deep alpine lakes in SW China. We conducted a multi-proxy study of the sedimentary records spanning the last 200 years from the two lakes. Our focus was on subfossil chironomid remains, but analyses of chemical elements, total organic carbon (TOC) and total nitrogen (TN) were also conducted. The principal results are as follows: 1) Both nutrient and chironomid assemblages underwent a critical transition in 1990 at YZ and in 1998 at CH. 2) The response of species richness varied between the two lakes, but the trends of their respective β diversity indices are consistent, despite the fact that the contributors to β diversity are different. 3) The stability of the chironomid communities has decreased in both lakes since the mid-20th century. 4) The relationship between diversity and stability varies in relation to the type of diversity. Overall, our results emphasize the importance of considering the complex nature of diversity and stability when studying community assemblages.
PMID: 31174098 [PubMed - as supplied by publisher]
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