Impact of environmental deviations on the larval and year-class abundances in the spring spawning herring (Clupea harengus membras L.) of the Gulf of Riga (Baltic Sea) in 1947–2004

Autor:	Timo Arula, Heli Shpilev, Ain Lankov, E. Ojaveer
Rok vydání:	2011
Předmět:	education.field_of_study Larva geography geography.geographical_feature_category fungi Population Clupea Aquatic Science Biology biology.organism_classification Fishery Herring Baltic sea Abundance (ecology) Spring (hydrology) education Eutrophication
Zdroj:	Fisheries Research. 107:159-168
ISSN:	0165-7836
DOI:	10.1016/j.fishres.2010.11.001
Popis:	Regular weekly sampling of larvae with a Hensen net in the stationary stations on the main spawning grounds of the brackishwater herring population in the Gulf of Riga was carried out in 1947–2004. Probably due to the rapidly increasing anthropogenic eutrophication and the rising winter temperature the yearly abundance of herring larvae has significantly increased with a shift in the average abundance in 1972/1973. Correlation of the average number of herring larvae with the year-class strength was significant for the intermediate (10–16 mm, P P P P > 0.05). In the period of milder winters the importance of the SSB in determination of the abundance of year classes considerably increased and it significantly correlated with the abundance of year classes ( P
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e8ed7c2f657997cd382ed2d8f61fdf3d https://doi.org/10.1016/j.fishres.2010.11.001 Zobrazit plný text záznamu Full Text from ScienceDirect