| 1. |
- Dinasquet, Julie, et al.
(författare)
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Cascading effects of the ctenophore Mnemiopsis leidyi on the planktonic food web in a nutrient-limited estuarine system
- 2012
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Ingår i: Marine Ecology Progress Serie. - : Inter-Research Science Center. - 0171-8630 .- 1616-1599. ; 460, s. 49-61
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Tidskriftsartikel (refereegranskat)abstract
- Increasing biomasses of gelatinous zooplankton presumably have major implications for the structure and function of marine food webs at large; however, current data on lower trophic levels are scarce, as most studies have focused on the immediate effects on zooplankton and fish larvae only. We examined the short-term impact of larvae and adults of the invasive ctenophore Mnemiopsis leidyi on a summer planktonic food web in the estuarine southern Baltic Sea, with special emphasis on the microbial loop. Grazing by M. leidyi reduced the mesozooplankton biomass, followed by increased dinoflagellate biomass in treatments with M. leidyi. While chlorophyll a increased most in the treatments with M. leidyi, small phytoplankton and ciliates decreased in all treatments. M. leidyi had a slight effect on bacterial abundance, but not on bacterial production, ectoenzymatic activities, or community composition. Undetectable levels of phosphate and a gradual accumulation of dissolved organic carbon during the experiment suggested a malfunctioning microbial loop scenario. The experiment shows that direct and indirect short-term effects of M. leidyi on the estuarine food web are limited to higher trophic levels and indicates that top-down and bottom-up consequences of M. leidyi expansions on the microbial loop will likely depend on local nutrient conditions.
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| 2. |
- Peter, Christian, et al.
(författare)
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The AGNES System for Ambient Social Interaction
- 2012
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Ingår i: Proceedings of the 5th International Conference on PErvasive Technologies Related to Assistive Environments. - New York, NY, USA : ACM Digital Library. - 9781450313001
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Konferensbidrag (refereegranskat)abstract
- This paper describes the AGNES system, a technology for connecting people at home with their social network be means of off-the-shelf sensing devices and an Internet-based social network. The system provides the user with relevant information of the network by use of traditional information and communication technology as well as dedicated ambient and tangible devices. We describe briefly the requirements on such technology that were elaborated in the frame of the AGNES project, and give an overview of the system developed.
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