Diel feeding behaviour of krill in the Gerlache Strait, Antarctica

Autor:	C. Almeida, Santiago Hernández-León, A. Portillo-Hahnefeld, Isabel Morales Moreno, P. Bécognée
Rok vydání:	2001
Předmět:	Krill Ecology biology Euphausia Aquatic Science Plankton biology.organism_classification Predation Oceanography Abundance (ecology) Phytoplankton Diel vertical migration Ecology Evolution Behavior and Systematics Copepod
Zdroj:	Marine Ecology Progress Series. 223:235-242
ISSN:	1616-1599 0171-8630
DOI:	10.3354/meps223235
Popis:	Abundance, gut fluorescence and gut content of juvenile krill Euphausia superba (15 to 20 mm) were measured during a diel cycle in the Gerlache Strait (Antarctic Peninsula). Krill re- mained in the upper layers (0 to 100 m) during the day and migrated downward below this depth dur- ing the night, coinciding with the vertical ascent of the copepod Metridia gerlachei to shallower lay- ers. Krill fed on phytoplankton during the day (as deduced from gut fluorescence measurements), whereas they switched to carnivory during the night (as deduced from gut contents). The vertical migration and the feeding behaviour of krill agree with different observations in the literature and gives an additional explanation to the observed inverse relationship between krill and non-krill zoo- plankton. The fact that krill is able to prey on mesozooplankton suggests that euphausiids can exert a top-down effect which structures the plankton community of Antarctic waters.
Databáze:	OpenAIRE
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