О влиянии некоторых параметров запаса и среды на численность поколений восточно-балтийской популяции трески
The relations of absolute and relative abundance of 13 year-classes (1966—1978) of the Eastern Baltic cod population with salinity and oxygen content in the Gotland Deep during spawning period and with spawning stock size (in all with 20 parameters of environment and stock) were considered using multiple regression analysis. In addition to the standard statistical parameters the influence of some terms in re-gression equation on the total sum of squares was estimated. The analysis of variants with the highest values of Fisher's criterion (P > 0.999) and the smallest values of standard error of regression showed, that year-class abundance is determined by a complex of environment and stock parameters, the influence of environmental factors and spawning stock size being approximately equal. All equations contain factors, related to abundance of parents, and their influence fluctuates from 36 to 74 %, the average is about 40 %. The dependence of year-class abundance on parents stock abundance suggests an explanation of relatively high level of cod stock recruitment in the Eastern Baltic during last years despite of rather unfavorable environmental conditions.
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
1984
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| Subjects: | Baltic cod, Year-class abundance, Spawning stock size, ASFA_2015::F::Fish stocks, ASFA_2015::E::Environmental conditions, ASFA_2015::R::Regression analysis, |
| Online Access: | http://hdl.handle.net/1834/15081 |
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