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Abstract <p>The peculiarities of ecology and biology of the damselfly <i>Enallagma cyathigerum</i> have been revealed as a result of long-term research in the Barabinsk forest steppe. The species lives in all permanent reservoirs (rivers, river channels, lakes, and ponds), where its most numerous populations have been identified. It also inhabits temporary reservoirs, surviving in them during periods of drying out due to the egg phase. Biotopic preferences in the choice of habitat have been found: larvae live only in nonreed hydrocenoses, which is associated with the ecological standards of the species. There has been a decrease in the number of <i>E. cyathigerum</i> during the last 20 years despite the increase in humidity in the region, which we explain by consequences of climate warming: weather disasters in summer and an increase in the temperature of air and, accordingly, of water in reservoirs, leading to deterioration of the hydrology of reservoirs and suffocation of aquatic organisms. The study of the development of <i>E. cyathigerum</i> in the Kargat River and Lake Fadikha in 2004–2006 has revealed a 1-year life cycle of the species, the population structure of which differs in the river and lake due to various hydrological and temperature regimes. The species population in the Kargat River was unified over all 3 years, while in Lake Fadikha it was unified in the high-water year of 2004, relatively unified in the low-water year of 2005, and divided into two seasonal groups (summer with wintering larvae and summer–autumn with wintering eggs) in the low-water year of 2006. This complicated population structure in Lake Fadikha in 2006 is a result of an increase in water temperature (due to an increase in the mean daily air temperature and a decrease in the water level in the lake) and is a kind of species adaptation to the deterioration of habitat conditions in the low-water period: eggs are present in the lake almost all year round (wintering and nonwintering), the age of larvae differs, and imagoes fly on land from spring to autumn. This adaptive feature of <i>E. cyathigerum</i> may partly explain its relatively high abundance, eurybiontness, and large range (almost the entire Palearctic).</p>

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Ecology and Biology of Enallagma cyathigerum (Charpentier, 1840) (Odonata) under Unstable Water Conditions in the South of Western Siberia

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • O. N. Popova,
  • A. Yu. Haritonov

摘要

Abstract

The peculiarities of ecology and biology of the damselfly Enallagma cyathigerum have been revealed as a result of long-term research in the Barabinsk forest steppe. The species lives in all permanent reservoirs (rivers, river channels, lakes, and ponds), where its most numerous populations have been identified. It also inhabits temporary reservoirs, surviving in them during periods of drying out due to the egg phase. Biotopic preferences in the choice of habitat have been found: larvae live only in nonreed hydrocenoses, which is associated with the ecological standards of the species. There has been a decrease in the number of E. cyathigerum during the last 20 years despite the increase in humidity in the region, which we explain by consequences of climate warming: weather disasters in summer and an increase in the temperature of air and, accordingly, of water in reservoirs, leading to deterioration of the hydrology of reservoirs and suffocation of aquatic organisms. The study of the development of E. cyathigerum in the Kargat River and Lake Fadikha in 2004–2006 has revealed a 1-year life cycle of the species, the population structure of which differs in the river and lake due to various hydrological and temperature regimes. The species population in the Kargat River was unified over all 3 years, while in Lake Fadikha it was unified in the high-water year of 2004, relatively unified in the low-water year of 2005, and divided into two seasonal groups (summer with wintering larvae and summer–autumn with wintering eggs) in the low-water year of 2006. This complicated population structure in Lake Fadikha in 2006 is a result of an increase in water temperature (due to an increase in the mean daily air temperature and a decrease in the water level in the lake) and is a kind of species adaptation to the deterioration of habitat conditions in the low-water period: eggs are present in the lake almost all year round (wintering and nonwintering), the age of larvae differs, and imagoes fly on land from spring to autumn. This adaptive feature of E. cyathigerum may partly explain its relatively high abundance, eurybiontness, and large range (almost the entire Palearctic).