The impact of temporal patterns of temperature and precipitation on silver Prussian carp (Carassius gibelio) spawning events

Abstract

It was revealed that Gibel carp, Carassius gibelio (Bloch, 1782) spawning phenology is determined by regular patterns of variability in temperature and precipitation over the period of time after spawning in the previous year. The sensitivity to temperature of water as a stimulus to spawning was shown as being dependent on the characteristics of the environment and fish development trajectories over the previous year. Information about fish spawning was collected in the Dnipro-Orylskiy Nature Reserve in the following locations: Nikolayev system of water bodies, River Protoch system and the Obukhov floodplain, the channel of the River Dnipro, water bodies of the Taromske ledge. The materials that formed the basis of this research were collected from the waters of the reserve in the years 1997–2018. There are dependencies between the air and water temperatures that have their own characteristics depending on the type of water body. These dependencies are described by a logistic equation. The temperature regime in water bodies of the Taromske ledge is very similar to the temperature regime of Nikolayev system of water bodies. The difference is that the spring period of the temperature increase in water bodies of the Taromske ledge comes earlier – in late February – early March. The air temperature dynamics over the year is described by the fourth degree polynomial. The residuals of the polynomial regression for each year were subjected to principal component analysis. The principal component analysis allowed us to identify 8 principal components of the temperature regimes, which together describe 59.2% of the variation of the residual of the polynomial trend. Deviations from the linear trend of the precipitation are systematic throughout the year, reflecting the uneven nature of rainfall during the year. The residuals of linear trend regression models of cumulative precipitation can be used as indicators of the dynamics characteristic of precipitation during the year. The residuals were used for principal component analysis, which revealed that the dynamics of the precipitation can be divided into five orthogonal principal components. The first five principal components explain 82.6% of the feature space variation. The timing of the onset of C. gibelio spawning in 95% of cases occurs on the 113–139th days of the year (on average, it takes place on the 125th day). Regression analysis revealed that the climate principal components and types of the lake systems can explain 79% of the variation in the timing of the onset of C. gibelio spawning. The water temperature at the time of C. gibelio spawning was exposed to natural dynamics in year aspect. The local minimum of the onset of spawning temperatures occured in the mid 2000s. Total of 69% of the water temperature variation at which spawning begins can be described by climatic predictors and water biotope types. The variation explained by some temperature principal components may be increased considerably after including as covariates such variables as the precipitation principal component and the biotope type. This principal component which represents the high frequency variation of the air temperature regime with a characteristic period 20 and 45 days has the highest explanation ability of all the components and is a constant explanatory predictor for all considered spawning characteristics.

Phenology in freshwaters: a review and recommendations for future research

“…Knowledge of species' life history can inform biodiversity conservation and our literature review identified a number of applications in which phenology can benefit freshwater conservation. Phenology events can inform invasive species management to identify potential areas susceptible for expansion and methods to control the spread of established introduced species populations (Liang et al 2005, Dexter et al 2015, Gooding et al 2018, Bondarev et al 2019, O'Brien et al 2019, Suresh et al 2019, Giménez et al 2020). Detailed studies on the phenology of imperiled and declining species may also assist in species recovery plans (Gorman and Stone 1999, Joshi et al 2018, Watanabe et al 2020).…”

Annual course of temperature and precipitation as proximal predictors of birds’ responses to climatic changes on the species and community level

“…Therefore, the cumulative sum of precipitation can be considered as a fairly good approximation that characterizes the water balance. The cumulative precipitation indicator gives a smoothed representation of the moisture dynamics (Bondarev et al, 2019;Bondarev and Zhukov, 2017). This indicator also reflects the presence of phenomena of moisture accumulation in the soil and water bodies, which provides a basis for the summation of the precipitation over a period.…”

Is gynogenetic reproduction in gibel carp (Carassius gibelio) a major trait responsible for invasiveness?

“…It may impact the populations of a variety of native freshwater fish species by directly competing for food, i.e. pelagic zooplankton and benthic invertebrates , or alter the top-down control of zooplankton (Bondarev et al 2019). Specifically, due to competition for food and space, gibel carp are responsible for the disappearance of some native cyprinoid species in some areas, i.e.…”