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Changes in the elemental composition of the stomach contents of the opossum shrimp Mysis relicta during diel vertical migration

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Clear differences in the elemental composition of the stomachs of adult Mysis relicta Lovén captured on or near the lake bottom during the day and those captured at night in the water column were observed using laser ablation – inductively coupled plasma – mass spectrometry. The elemental composition of the stomachs of mysids captured at night indicated that they were feeding on zooplankton and algae, whereas the stomachs of those captured during the day indicated sediment feeding. These results suggest that lake sediments may be a significant part of the mysid diet and that sediments transported vertically as gut contents may contribute to the transport of elements into the water column.

Des analyses par spectrométrie de masse à source plasma couplée à un système d'ablation laser révèlent qu'il existe de nettes différences de composition en éléments des contenus stomacaux entre les adultes de Mysis relicta Lovén capturés le jour sur le fond ou près du fond du lac et ceux capturés la nuit dans la colonne d'eau. La composition en éléments des contenus stomacaux des mysidés capturés la nuit indique qu'ils se nourrissent de zooplancton et d'algues, alors que, chez ceux qui sont capturés le jour, elle montre qu'ils se nourrissent de sédiments. Ces observations indiquent que les sédiments lacustres peuvent constituer une partie significative du régime alimentaire des mysidés et que les sédiments lacustres transportés dans le contenu intestinal durant la migration verticale peuvent contribuer à l'apport d'éléments dans la colonne d'eau.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2004-03-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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