Publications by authors named "Andrei Sivkov"
Differences in spatial versus temporal reaction norms for spring and autumn phenological events.
Proc Natl Acad Sci U S A
December 2020
Article Synopsis
- - Species rely on environmental cues, like degree-days, to time their phenological events and exhibit varying responses based on their location and the season.
- - The study analyzed data from 91 taxa across 472 sites in the former Soviet Union, finding that spring phenological events advance more consistently with temperature cues (cogradient variation), while autumn events are less responsive (countergradient variation).
- - Despite some local adaptations, phenological events generally do not keep pace with environmental cues, particularly lagging further in earlier years, suggesting differing impacts of climate change on spring and autumn species responses.
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
View Article and Find Full Text PDFWe present an extensive, large-scale, long-term and multitaxon database on phenological and climatic variation, involving 506,186 observation dates acquired in 471 localities in Russian Federation, Ukraine, Uzbekistan, Belarus and Kyrgyzstan. The data cover the period 1890-2018, with 96% of the data being from 1960 onwards. The database is rich in plants, birds and climatic events, but also includes insects, amphibians, reptiles and fungi.
View Article and Find Full Text PDFPrognostic estimation of chemical composition of recurrent urinary stones.
Arch Ital Urol Androl
March 2011
We conducted a retrospective study of the course of recurrent urolithiasis in 127 patients (63 women, 64 men aged from 27 to 58) who were under close and regular outpatient follow-up for up to 15 years and who did not receive conservative prophylactic therapy due to different reasons. The group consisted of 33 patients with uric acid lithiasis, 52 patients with calcium oxalate lithiasis, 42 patients with magnesium-ammonium-phosphate lithiasis. By the start of follow-up not a single patient had had urinary stones detected by ultrasound and X-ray.
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