Kiørboe, Thomas

Poulsen, Louise K.

Sediment trap studies have revealed that often only a minor fraction of the zooplankton fecal pellet production leave the upper ocean, and it has been suggested that copepod grazing on pellets (coprophagy) is the reason for this. A simple model is here used to estimate rate of coprophagy from lab and field observations. In the lab Acartia tonsa and Temora longicornis have coprophagous behavior and clear fecal pellets at a rate of 10-15 ml/female/d. Observations of fecal pellet production, sedimentation, and abundance collected during a 10-d late summer study in the North Sea revealed that less than 5 % of the fecal pellet production in the upper 50 m was lost as flux below 50 m depth. Estimates of coprophagy rates showed, however, that the zooplankton community &gt; 200 um could account for only a few percent of the fecal pellet loss. Thus, plankton organisms &lt; 200 �m must be responsible for the degradation of the fecal pellet

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Coprophagy in copepods and in a natural zooplankton community - DTU Orbit (08/08/2016) Coprophagy in copepods and in a natural zooplankton communitySediment trap studies have revealed that often only a minor fraction of the zooplankton fecal pellet production leave theupper ocean, and it has been suggested that copepod grazing on pellets (coprophagy) is the reason for this. A simplemodel is here used to estimate rate of coprophagy from lab and field observations. In the lab Acartia tonsa and Temoralongicornis have coprophagous behavior and clear fecal pellets at a rate of 10-15 ml/female/d. Observations of fecal pelletproduction, sedimentation, and abundance collected during a 10-d late summer study in the North Sea revealed that lessthan 5 % of the fecal pellet production in the upper 50 m was lost as flux below 50 m depth. Estimates of coprophagy ratesshowed, however, that the zooplankton community > 200 um could account for only a few percent of the fecal pellet loss.Thus, plankton organisms < 200 �m must be responsible for the degradation of the fecal pellets General informationState: PublishedOrganisations: National Institute of Aquatic Resources, Danish Shellfish Centre, Centre for Ocean LifeAuthors: Poulsen, L. K. (Intern), Kiørboe, T. (Intern)Publication date: 2004Event: Abstract from ASLO/TOS ocean research 2004 conference, Honolulu (US), 15-20 Feb, .Main Research Area: Technical/natural sciencesPublication: Research › Conference abstract for conference – Annual report year: 2004 

Coprophagy in copepods and in a natural zooplankton community

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Coprophagy in copepods and in a natural zooplankton community

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