نتایج جستجو برای: rutilus rutilus caspius
تعداد نتایج: 1379 فیلتر نتایج به سال:
Population-ecological analysis of Aral roach ( Rutilus rutilus aralensis ) was conducted in Tuzkan lake Aydar-Arnasay system Uzbekistan. In the system, it analyzed age structure, body weight, 19 morphometric and 5 meristematic indicators 158 fish specimens caught Lake January February 2020. The main selected as a result statistical are: arithmetic mean; error rate; variability morpho-physiologi...
Quantifying the effects of human activity on the natural environment is dependent on credible estimates of reference conditions to define the state of the environment before the onset of adverse human impacts. In Europe, emission controls that aimed at restoring ecological status were based on hindcasts from process-based models or paleolimnological reconstructions. For instance, 1860 is used i...
Migration has evolved as a strategy to maximise individual fitness in response to seasonally changing ecological and environmental conditions. However, migration can also incur costs, and quantifying these costs can provide important clues to the ultimate ecological forces that underpin migratory behaviour. A key emerging model to explain migration in many systems posits that migration is drive...
By conveying information of disease resistance, sexual signals may be used as cues for adaptive mate choice. Here we report observations on survival of laboratory-maintained, wild-collected, sexually mature, ready-to-spawn cyprinid fish, Rutilus rutilus (roach), under accidental epidemic attributed to Flavobacterium psychrophilum, diagnosed using species-specific PCR. The fish were maintained i...
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