Особенности воспроизводства балтийского шпрота в 1971-1985 гг.
The article has first considered the regularities governing the Baltic sprat year classes' abundances at early stages of ontogenesis. The impact of variations in the heat-loving zooplankton productivity, the temperature regime and predators loading upon the sprat year classes' formation has been shown. The periods of a high sprat abundance are well related with warm years, the northward expansion of the spawning and feeding areas, the high amounts of eggs and larvae and the heat-loving zooplankton (Temora, Centropages, Bosmina), and with the low cod stock abundance. The low level of sprat reproduction is noted in cold years when the terms and spawning areas are shortened, the food availability of larvae and fingerlings is poor due to the decreased heat-loving zooplankton amount, as well as in the years of the intensified inflow of the North Sea water followed by an increased cod abundance. Predation-induced decline in the sprat amount is well expressed in the spawning areas. According to the regression analysis, the sprat year classes abundances in the years 1971-1985 were defined by the cod predation, 26.88 %, the spawning stock abundance, 20.69 %, the winter phosphorus concentration, 17.43 %, the sprat larvae abundance in May, 9.98 %, and by the amount of Nauplii in May, 4.67 %. The sum of these factors is 79.65 % at p ≥ 0.95.
Main Authors: | , , |
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Format: | Journal Contribution biblioteca |
Language: | Russian |
Published: |
1987
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Subjects: | Baltic sprat, Baltic cod, Year-class strength, ASFA_2015::P::Population abundance (in number), ASFA_2015::I::Ichthyoplankton, ASFA_2015::S::Spawning grounds, ASFA_2015::F::Fish larvae, ASFA_2015::F::Fish eggs, |
Online Access: | http://hdl.handle.net/1834/9894 |
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dig-aquadocs-1834-98942023-11-21T11:22:15Z Особенности воспроизводства балтийского шпрота в 1971-1985 гг. The Baltic sprat reproduction in 1971-1985 Grauman, G.B. Line, R. Sidrevits, L. Baltic sprat Baltic cod Year-class strength ASFA_2015::P::Population abundance (in number) ASFA_2015::I::Ichthyoplankton ASFA_2015::S::Spawning grounds ASFA_2015::F::Fish larvae ASFA_2015::F::Fish eggs The article has first considered the regularities governing the Baltic sprat year classes' abundances at early stages of ontogenesis. The impact of variations in the heat-loving zooplankton productivity, the temperature regime and predators loading upon the sprat year classes' formation has been shown. The periods of a high sprat abundance are well related with warm years, the northward expansion of the spawning and feeding areas, the high amounts of eggs and larvae and the heat-loving zooplankton (Temora, Centropages, Bosmina), and with the low cod stock abundance. The low level of sprat reproduction is noted in cold years when the terms and spawning areas are shortened, the food availability of larvae and fingerlings is poor due to the decreased heat-loving zooplankton amount, as well as in the years of the intensified inflow of the North Sea water followed by an increased cod abundance. Predation-induced decline in the sprat amount is well expressed in the spawning areas. According to the regression analysis, the sprat year classes abundances in the years 1971-1985 were defined by the cod predation, 26.88 %, the spawning stock abundance, 20.69 %, the winter phosphorus concentration, 17.43 %, the sprat larvae abundance in May, 9.98 %, and by the amount of Nauplii in May, 4.67 %. The sum of these factors is 79.65 % at p ≥ 0.95. В работе впервые описаны закономерности, регулирующие численность поколений балтийского шпрота на ранних стадиях онтогенеза. Показано значительное влияние изменений продуктивности тепловодного зоопланктона, термического режима и пресса хищников на формирование поколений шпрота. Периоды высокой численности шпрота хорошо увязываются с теплыми годами, расширением нерестовых и нагульных площадей в северном направлении, высокой численностью икры и личинок, тепловодного зоопланктона (теморы, центропагеса, босмины) и низким запасом трески (хищника). Низкий уровень воспроизводства шпрота отмечается в холодноводные годы при сокращении сроков и районов икрометания, при низкой обеспеченности пищей личинок и мальков в связи с уменьшением количества тепловодного комплекса зоопланктона, а также в годы интенсивных втоков североморских вод, что сопровождается увеличением численности трески. Убыль шпрота от хищников особенно ярко выражена в районах нереста. Согласно регрессионному анализу доля влияния отдельных факторов на урожайность поколений шпрота в 1975-1985 году следующая: выедание треской – 26,88%, величина нерестового стада – 20,69%, количество фосфора зимой – 17,43%, численность личинок шпрота в мае – 9,98%, количество науплиев в мае – 4,67%. Сумма влияния этих факторов составляет 79,65% при p ≥ 0.95. 11. ausgabe des sonderheftes über fischereiliche untersuchungen der DDR und der UDSSR in der Ostsee. 11. выпуск совместного сборника научных статей по вопросам рыбохозяйственных исследований ГДР и СССР в Балтийском море. Published 2017-09-20T13:09:47Z 2017-09-20T13:09:47Z 1987 Journal Contribution Not Known 0428-4984 http://hdl.handle.net/1834/9894 ru pp. 48-52 Baltic Sea |
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Baltic sprat Baltic cod Year-class strength ASFA_2015::P::Population abundance (in number) ASFA_2015::I::Ichthyoplankton ASFA_2015::S::Spawning grounds ASFA_2015::F::Fish larvae ASFA_2015::F::Fish eggs Baltic sprat Baltic cod Year-class strength ASFA_2015::P::Population abundance (in number) ASFA_2015::I::Ichthyoplankton ASFA_2015::S::Spawning grounds ASFA_2015::F::Fish larvae ASFA_2015::F::Fish eggs |
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Baltic sprat Baltic cod Year-class strength ASFA_2015::P::Population abundance (in number) ASFA_2015::I::Ichthyoplankton ASFA_2015::S::Spawning grounds ASFA_2015::F::Fish larvae ASFA_2015::F::Fish eggs Baltic sprat Baltic cod Year-class strength ASFA_2015::P::Population abundance (in number) ASFA_2015::I::Ichthyoplankton ASFA_2015::S::Spawning grounds ASFA_2015::F::Fish larvae ASFA_2015::F::Fish eggs Grauman, G.B. Line, R. Sidrevits, L. Особенности воспроизводства балтийского шпрота в 1971-1985 гг. |
description |
The article has first considered the regularities governing the Baltic sprat year classes' abundances at early stages of ontogenesis. The impact of variations in the heat-loving zooplankton productivity, the temperature regime and predators loading upon the sprat year classes' formation has been shown.
The periods of a high sprat abundance are well related with warm years, the northward expansion of the spawning and feeding areas, the high amounts of eggs and larvae and the heat-loving zooplankton (Temora, Centropages, Bosmina), and with the low cod stock abundance. The low level of sprat reproduction is noted in cold years when the terms and spawning areas are shortened, the food availability of larvae and fingerlings is poor due to the decreased heat-loving zooplankton amount, as well as in the years of the intensified inflow of the North Sea water followed by an increased cod abundance. Predation-induced decline in the sprat amount is well expressed in the spawning areas. According to the regression analysis, the sprat year classes abundances in the years 1971-1985 were defined by the cod predation, 26.88 %, the spawning stock abundance, 20.69 %, the winter phosphorus concentration, 17.43 %, the sprat larvae abundance in May, 9.98 %, and by the amount of Nauplii in May, 4.67 %. The sum of these factors is 79.65 % at p ≥ 0.95. |
format |
Journal Contribution |
topic_facet |
Baltic sprat Baltic cod Year-class strength ASFA_2015::P::Population abundance (in number) ASFA_2015::I::Ichthyoplankton ASFA_2015::S::Spawning grounds ASFA_2015::F::Fish larvae ASFA_2015::F::Fish eggs |
author |
Grauman, G.B. Line, R. Sidrevits, L. |
author_facet |
Grauman, G.B. Line, R. Sidrevits, L. |
author_sort |
Grauman, G.B. |
title |
Особенности воспроизводства балтийского шпрота в 1971-1985 гг. |
title_short |
Особенности воспроизводства балтийского шпрота в 1971-1985 гг. |
title_full |
Особенности воспроизводства балтийского шпрота в 1971-1985 гг. |
title_fullStr |
Особенности воспроизводства балтийского шпрота в 1971-1985 гг. |
title_full_unstemmed |
Особенности воспроизводства балтийского шпрота в 1971-1985 гг. |
title_sort |
особенности воспроизводства балтийского шпрота в 1971-1985 гг. |
publishDate |
1987 |
url |
http://hdl.handle.net/1834/9894 |
work_keys_str_mv |
AT graumangb osobennostivosproizvodstvabaltijskogošprotav19711985gg AT liner osobennostivosproizvodstvabaltijskogošprotav19711985gg AT sidrevitsl osobennostivosproizvodstvabaltijskogošprotav19711985gg AT graumangb thebalticspratreproductionin19711985 AT liner thebalticspratreproductionin19711985 AT sidrevitsl thebalticspratreproductionin19711985 |
_version_ |
1787227837126672384 |