Feeding of Themisto libellula (Amphipoda Crustacea) on natural copepods assemblages in an Arctic fjord (Kongsfjorden, Svalbard)

• Published in: Polar Biology
• Main Authors: Noyon, Margaux, Gasparini, Stephane, Mayzaud, Patrick
• Other Authors: Ocean Sciences & Marine Food Security Port Elizabeth, South Africa, Nelson Mandela Metropolitan University Port Elizabeth, South Africa, Laboratoire d'océanographie de Villefranche (LOV), Observatoire océanologique de Villefranche-sur-mer (OOVM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2009
• Subjects: [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; Arctic; Svalbard; Kongsfjord*; Kongsfjorden; Mesozooplankton; Polar Biology; Themisto; Themisto libellula; Copepods
• Online Access: https://hal.archives-ouvertes.fr/hal-03505005; https://doi.org/10.1007/s00300-009-0655-9

Ingestion rates and selectivity of the Arctic pelagic amphipod Themisto libellula were studied experimentally in Kongsfjorden (Svalbard, 78A degrees N) during the summer period. Feeding incubations were conducted on naturally occurring copepod communities at different concentrations ranging from 25 to 250 preys L-1. The ingestion rates increased with food availability from 1.3 to 17.7 preys ind(-1) day(-1), which corresponded to 0.3-11% of body carbon day(-1). Despite the high prey concentration used in the experiments the satiation level was not reached. We suggested that T. libellula is able to take the maximum benefit from dense patches of preys, which represent a good adaptation to the high variability in food supply characteristic of polar environment. Copepodids stage III of Calanus spp. appeared to be the preferred preys of T. libellula. Smaller copepods such as Oithona similis and Pseudocalanus spp., were also selected but only when their relative abundance exceeded 25% of the total prey available. The potential predation impact of T. libellula is discussed in relation to the mesozooplankton small-scale patchiness and predator abundance.