Abstract
Knowledge on community structure oriented to describe energy flow during late summer season in Paso Ancho basin (Strait of Magellan) is scarce and particularly affected by vertical diel migration (VDM). The main aim of this work is to identify the VDM patterns of selected species and functional feeding groups of mesozooplankton, collected by the electronic multinet BIONESS in 1995. Detailed studies were carried out on keystone components of the community: 7 species of copepods (Ctenocalanus citer, Drepanopus forcipatus, Metridia lucens, Clausocalanus brevipes, Scolecithricella minor, Paraeuchaeta antarctica, Calanus simillimus), one ostracod (Discoconchoecia elegans), one chaetognath (Sagitta tasmanica), one euphausiid (Euphausia vallentini), and two polychaetes (Pelagobia longicirrata, Tomopteris planktonis). Unexpected deviations from the classic pattern reported in literature were uncovered. The shallow layer mesozooplankton at night, although dominated by exclusively or preferentially herbivores, particularly by E. vallentini, was not represented by several species known as herbivores that remained in the deep layer throughout the day cycle. The deep-layer zooplankton throughout the day cycle was well represented by carnivores, detritivores, and omnivores. It is suggested that during low-chlorophyll summer conditions, the composition of functional groups and diet, and VDM patterns changed to take advantage of sinking phytoplankton and picoplankton in deep layers. Pelagic-benthic coupling would be strengthened due to animals that suppressed their vertical daily rise to the shallow layer at nights but remained in the deep layers to feed on a rain of particulate organic matter and other non-migrant zooplankton.
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Logistical and financial support for this paper was given by the Italian National Program of Research in Antarctica (PNRA). Thanks go to Mrs Kristen Lee Ray for the English revision of the manuscript.
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This article belongs to a special topic: a number of articles coordinated by L. Guglielmo and V. Saggiomo appear in this issue of Polar Biology and are a result of two workshops on “The pelagic ecosystem of the Straits of Magellan” held in August 2008 and 2009 in Capo Calavà Village, Messina, Italy.
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Guglielmo, L., Minutoli, R., Bergamasco, A. et al. Short-term changes in zooplankton community in Paso Ancho basin (Strait of Magellan): functional trophic structure and diel vertical migration. Polar Biol 34, 1301–1317 (2011). https://doi.org/10.1007/s00300-011-1031-0
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DOI: https://doi.org/10.1007/s00300-011-1031-0