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• W2041910142 abstract "Virtually all species of Hyperiidea have a symbiotic relationship with gelatinous zooplankton. It has been theorized that hyperiid amphipods are descendants of benthic crustaceans that have developed a unique benthic-like existence on the pelagic substratum provided by gelatinous zooplankton. But does this strategy have hidden metabolic costs? Metabolism, in the form of both direct respiration and enzyme activities, and proximate composition of Phronima were compared to pelagic and benthic crustaceans. Although less energy is needed to remain in the water column since the gelatinous zooplankton makes the Phronima more buoyant than just Phronima alone, metabolicrates of Phronima are not lower than those of other pelagic crustaceans, possibly due to the energy needed to propel the barrel. However, Phronima have lower protein concentrations, indicating less energy is allocated to muscle production. The ratio of LDH (L-lactate dehydrogenase) activity to CS (citrate synthase) activity was >1, indicating that burst swimming is important in Phronima's metabolism. The symbiotic relationship provides the Phronima with food and a substrate for the brooding of young, but does not give them an energetic advantage over other pelagic crustaceans. Pratiquement toutes les especes d'Hyperiidea ont une association symbiotique avec du zooplancton gelatineux. Une theorie propose que les amphipodes hyperiides descendent de crustaces benthiques ayant developpe un mode de vie unique, proche d'une existence benthique, en utilisant le substrat pelagique constitue par le zooplancton gelatineux. Mais cette strategie a-t-elle des couts metaboliques caches? Le metabolisme de Phronima, evalue par l'ensemble respiration et activites enzymatiques et la composition du corps de cet amphipode ont ete compares a ceux de crustaces pelagiques et benthiques. Bien que moins d'energie soit necessaire pour rester dans la colonne d'eau puisque le zooplancton gelatineux augmente la flottabilite de Phronima, par comparaison avec des individus isoles, les taux metaboliques de Phronima ne sont pas inferieurs a ceux d'autres crustaces pelagiques, peut-etre a cause de l'energie necessaire a la propulsion du tonneau. Cependant Phronima a une plus faible concentration proteique ce qui montre que moins d'energie est alloue a la production de muscle. Le rapport entre l'activite de la LDH (L-lactate deshydrogenase) et l'activite de la CS (citrate synthase) etait >1, indiquant l'importance de la nage brusque dans le metabolisme de Phronima. L'association symbiotique fournit a Phronima de la nourriture et un substrat pour l'incubation des jeunes, mais il ne leur confere pas d'avantage energetique par rapport a d'autres crustaces pelagiques." @default.
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• W2041910142 date "2006-01-01" @default.
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• W2041910142 title "Phronima energetics: is there a bonus to the barrel?" @default.
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• W2041910142 doi "https://doi.org/10.1163/156854006778859669" @default.
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