Investigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan

Abstract Climate warming is of concern as a key factor in the worldwide decline in insect populations. In Japan, numbers of a common dragonfly in rice paddy fields, Sympetrum frequens, decreased sharply in the 1990s. Because S. frequens migrates to cooler mountains in summer, climate warming has bee...

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Autores principales:	Kosuke Nakanishi, Dai Koide, Hiroyuki Yokomizo, Taku Kadoya, Takehiko I. Hayashi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f65d0754d5b54ddfa4e5b669b2a3d891
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spelling	oai:doaj.org-article:f65d0754d5b54ddfa4e5b669b2a3d8912021-12-02T16:06:39ZInvestigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan10.1038/s41598-020-69532-82045-2322https://doaj.org/article/f65d0754d5b54ddfa4e5b669b2a3d8912020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-69532-8https://doaj.org/toc/2045-2322Abstract Climate warming is of concern as a key factor in the worldwide decline in insect populations. In Japan, numbers of a common dragonfly in rice paddy fields, Sympetrum frequens, decreased sharply in the 1990s. Because S. frequens migrates to cooler mountains in summer, climate warming has been suggested as one of the main causes of the population decline in addition to agronomic factors. Here, we analysed the relation between summer temperatures and population densities of S. frequens and the related S. infuscatum, which does not migrate to mountains in summer, using published population monitoring data and temperature data from three regions (Toyama, Ishikawa, and Shizuoka) in Japan. Decadal differences in summer temperatures lay within the range of fluctuations among years, suggesting that an increase in summer temperatures cannot explain the past sharp population declines. However, regression analyses using monitoring data from Toyama showed that the population dynamics of both species in autumn are negatively correlated with summer temperatures in the same year. These results suggest that high temperatures in summer directly affect adult mortality to an extent that results in a decrease in population growth.Kosuke NakanishiDai KoideHiroyuki YokomizoTaku KadoyaTakehiko I. HayashiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-8 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kosuke Nakanishi Dai Koide Hiroyuki Yokomizo Taku Kadoya Takehiko I. Hayashi Investigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan
description	Abstract Climate warming is of concern as a key factor in the worldwide decline in insect populations. In Japan, numbers of a common dragonfly in rice paddy fields, Sympetrum frequens, decreased sharply in the 1990s. Because S. frequens migrates to cooler mountains in summer, climate warming has been suggested as one of the main causes of the population decline in addition to agronomic factors. Here, we analysed the relation between summer temperatures and population densities of S. frequens and the related S. infuscatum, which does not migrate to mountains in summer, using published population monitoring data and temperature data from three regions (Toyama, Ishikawa, and Shizuoka) in Japan. Decadal differences in summer temperatures lay within the range of fluctuations among years, suggesting that an increase in summer temperatures cannot explain the past sharp population declines. However, regression analyses using monitoring data from Toyama showed that the population dynamics of both species in autumn are negatively correlated with summer temperatures in the same year. These results suggest that high temperatures in summer directly affect adult mortality to an extent that results in a decrease in population growth.
format	article
author	Kosuke Nakanishi Dai Koide Hiroyuki Yokomizo Taku Kadoya Takehiko I. Hayashi
author_facet	Kosuke Nakanishi Dai Koide Hiroyuki Yokomizo Taku Kadoya Takehiko I. Hayashi
author_sort	Kosuke Nakanishi
title	Investigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan
title_short	Investigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan
title_full	Investigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan
title_fullStr	Investigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan
title_full_unstemmed	Investigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan
title_sort	investigating effect of climate warming on the population declines of sympetrum frequens during the 1990s in three regions in japan
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/f65d0754d5b54ddfa4e5b669b2a3d891
work_keys_str_mv	AT kosukenakanishi investigatingeffectofclimatewarmingonthepopulationdeclinesofsympetrumfrequensduringthe1990sinthreeregionsinjapan AT daikoide investigatingeffectofclimatewarmingonthepopulationdeclinesofsympetrumfrequensduringthe1990sinthreeregionsinjapan AT hiroyukiyokomizo investigatingeffectofclimatewarmingonthepopulationdeclinesofsympetrumfrequensduringthe1990sinthreeregionsinjapan AT takukadoya investigatingeffectofclimatewarmingonthepopulationdeclinesofsympetrumfrequensduringthe1990sinthreeregionsinjapan AT takehikoihayashi investigatingeffectofclimatewarmingonthepopulationdeclinesofsympetrumfrequensduringthe1990sinthreeregionsinjapan
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Investigating effect of climate warming on the population declines of Sympetrum frequens during the 1990s in three regions in Japan

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