Seasonal variation of gelatinous plankton consumption by fish in the South-western Atlantic Ocean: a question of strategy

Autor:	Felisa Sánchez, Noemí R. Marí, Luciana Mabel Diaz Briz, Gabriel Genzano
Rok vydání:	2018
Předmět:	0106 biological sciences Fish species Zoology Aquatic Science Biology Oceanography 010603 evolutionary biology 01 natural sciences Diversity of fish Predation Ciencias Biológicas FISH PREDATION medicine Food resource Ecology Evolution Behavior and Systematics GELATINOUS PLANKTON 010604 marine biology & hydrobiology digestive oral and skin physiology fungi Biología Marina Limnología Seasonality Plankton medicine.disease SEASONALITY Fish Cold period STRATEGY OF CONSUMPTION CIENCIAS NATURALES Y EXACTAS
Zdroj:	Marine Biology Research. 14:739-751
ISSN:	1745-1019 1745-1000
Popis:	Gelatinous plankton is an important food resource for several species of fishes in theSouthwestern Atlantic Ocean. Some fish depend heavily on these organisms and arespecialized to feed on ctenophores, salps and medusae, while others only consumegelatinous plankton occasionally. We hypothesize that consumption of gelatinous planktonby fishes represents an alternative food resource when primary prey are not available duringcold periods in the study area. To determine seasonal variations of gelatinous planktonconsumption by fishes, data samples were grouped into cold and warm periods. A total of64,567 stomachs belonging to 106 species of fish were analysed, of which 32,943 (51%)contained food items. Of those containing food items, 2719 (8.2%), from 38 fish species,contained gelatinous items. Fourteen species ingested gelatinous in warm period, nine incold period, and 15 in both periods. The proportion of stomachs with gelatinous wassignificantly greater during the cold period. Ctenophores were the most predominant prey inboth periods, followed by salps and medusae. Consumption of ctenophores, salps andmedusae was unevenly distributed within the area during the different periods. Classificationmethods (group average sorting utilizing Bray?Curtis similarity measures based on log (X + 1)identified eight areas of consumption. SIMPER (similarity percentages) analyses revealed thatnine fish species contributed most to gelatinous plankton consumption. The seasonal andspatial variation of gelatinous consumption by fish would be related to the availability offood in each period. Strategies of gelatinous consumption, including survival, feedingopportunities and prey specialization, are discussed. Fil: Diaz Briz, Luciana Mabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Sanchez, Mariela Felisa. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales; Argentina Fil: Marí, Noemí. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina Fil: Genzano, Gabriel Nestor. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina
Databáze:	OpenAIRE
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