Long-term variations in the relationships between the main components of the Barents Sea ecosystem (cod and capelin) and ecological and physiological aspects of their interactions ...

• Main Authors: Orlova, Emma, Dolgov, A., Boitsov, V., Ushakov, N., Rudneva, G.
• Format: Conference Object
• Language: unknown
• Published: ASC 2006 - Theme session O 2024
• Subjects: Ecosystem observation, processes and dynamics; Pressures, impacts, conservation, and management; Barents Sea; polar cod
• Online Access: https://dx.doi.org/10.17895/ices.pub.25259164; https://ices-library.figshare.com/articles/conference_contribution/Long-term_variations_in_the_relationships_between_the_main_components_of_the_Barents_Sea_ecosystem_cod_and_capelin_and_ecological_and_physiological_aspects_of_their_interactions/25259164

No abstracts are to be cited without prior reference to the author.Main trends in the dynamics of the cod-capelin relationship were studied using long-term (starting from the 1970s) data and taking into account stock dynamics and climatic variations. The number of capelin per one cod was taken as an indicator of abundance of the main food which is related to such factors as fisheries on capelin, its consumption by predators, and overlap of cod and capelin distribution. Major trophic relationships of cod, diet switch to substitute objects (polar cod, herring, fish fry, crustaceans, benthos), seasonal and interannual fatness variations, and development of feeding patterns were studied for years with different availability of capelin. According to the first feeding pattern, characterised by high abundance and availability of capelin, cod is provided with good food supplies (and has large fat reserves) during the entire feeding period. This ensures stable conditions of wintering, growth and maturation. The ...