Abstract
This paper describes spawning events of the white bream Blicca bjoerkna (Linnaeus, 1758 )in astronomical and biological time depending on seasonal patterns of climatic conditions. The research was conducted in the Dnipro-Orilskiy Nature Reserve (Ukraine) during the years 1997–2015 in four habitat types. The timing of the spawning event (start, end) was evaluated using astronomical time (number of days from January 1 each year), with correction for the lunar and the semilunar cycle, and using biological time (number of days from the end of spawning in the previous year to the beginning and end of spawning in the current year). The spawning phenology of the white bream was found to be dependent on the dynamics of weather conditions over time. Patterns of varying climatic regimes which are expressed by means of multivariate principal component are the most informative predictors of the spawning events. Evaluation of occurrence of spawning events in astronomic or biological time gives somewhat different models of the impact of climate regimes. The impact of the principal components indicating variability of rainfall during the year in which spawning occurs is statistically significant for almost all regression models. Models using the solar calendar are also more sensitive to the course of air temperatures within the year when spawning occurred. Correction of time based on the lunar cycle allows us to assess events which are sensitive also to the temperature and rainfall variation during the second half of the previous year. Biological time was shown to be sensitive to environmental influences over time from the end of spawning in the previous year to spawning in any given year.
Highlights
The modern doctrine of the biosphere is a largely empirical generalization of V.I. Vernadsky (1923, 1926), according to which the concept of biosphere includes the sphere of life, and other structures of the Earth, which are genetically related to living matter (Sokolov, 2010)
This paper describes spawning events of the white bream Blicca bjoerkna (Linnaeus, 1758 )in astronomical and biological time depending on seasonal patterns of climatic conditions
White bream spawning began between April 29 and May 23, and ended between 20 May and 12 June (Bondarev & Zhukov, 2017)
Summary
The modern doctrine of the biosphere is a largely empirical generalization of V.I. Vernadsky (1923, 1926), according to which the concept of biosphere includes the sphere of life, and other structures of the Earth, which are genetically related to living matter (Sokolov, 2010). Vernadsky (1923, 1926), according to which the concept of biosphere includes the sphere of life, and other structures of the Earth, which are genetically related to living matter (Sokolov, 2010). Geomerida is seen as the single organism of the Earth (Lyubishchev, 1982). Some general ideas in the field of philosophy and biology in the early twentieth century are important at a time when global climate change includes synchronous changes in living systems at different hierarchical levels. Understanding of the dynamics of phenological processes and seasonal timing in the context of global climate change is of particular relevance (Visser et al, 2010, Forrest & Miller-Rushing, 2010)
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