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DatoValore
TitleResponse of rotifer functional groups to changing trophic state and crustacean community
AbstractInformation based on taxon-based indices is species-specific while information gained from function-based research can give a comprehensive view of ecosystem processes. We applied the guild-ratio, an index based on the proportion of functional groups of roofers (i.e. microphagous and raptorial species), on a long-term data set of Logo Maggiore. By applying seasonal trend decomposition based on smoothing techniques and non-metrical multidimensional scaling, we assessed the response of rotifer functional groups to changes in trophic state and climate. While the taxon-based indices showed smooth changes, the function-based index showed a dramatic shift from a raptorial to a microphagous dominance, with a back-shift to raptorial dominance starting in 2000. The seasonal peak of microphagous and raptorial dry weight was clearly separated in the pre-eutrophication period. When mesotrophic conditions prevailed both peaks overlapped Only to he separated again with re-oligotrophication. We attributed these alterations of rotifer functional groups to changes in competition with crustacean zooplankton and to decreased phytoplankton algal abundance and size while altered seasonality in functional groups could be related to inter-group competition fin. food. We hypothesise that the effects of trophic state (i.e. altered phytoplankton) and climate (i.e. altered cladoceran community) were transferred across trophic levels to rotifer functional groups. Our study highlights that functional groups are valid instruments for illustrating unifying principles in ecology through a better understanding of ecosystem processes and the interrelationship between trophic levels.
SourceJournal of limnology (Testo stamp.) 70 (2), pp. 231–238
KeywordsMicrophagous rotifersraptorial rotifersSTLDaphniadiversity
JournalJournal of limnology (Testo stamp.)
EditorIstituto per lo Studio degli Ecosistemi., Verbania Pallanza, Italia
Year2011
TypeArticolo in rivista
DOI10.3274/JL11-70-2-07
AuthorsObertegger, U (Obertegger, Ulrike)[ 1 ] ; Manca, M (Manca, Marina)[ 2 ]
Text203810 2011 10.3274/JL11 70 2 07 ISI Web of Science WOS 000294320400008 Microphagous rotifers raptorial rotifers STL Daphnia diversity Response of rotifer functional groups to changing trophic state and crustacean community Obertegger, U Obertegger, Ulrike 1 ; Manca, M Manca, Marina 2 1 IASMA Res Innovat Ctr, FEM, I 38010 San Michele All Adige, TN, Italy 2 Inst Ecosyst Studies, CNR, I 28922 Verbania, VB, Italy Information based on taxon based indices is species specific while information gained from function based research can give a comprehensive view of ecosystem processes. We applied the guild ratio, an index based on the proportion of functional groups of roofers i.e. microphagous and raptorial species , on a long term data set of Logo Maggiore. By applying seasonal trend decomposition based on smoothing techniques and non metrical multidimensional scaling, we assessed the response of rotifer functional groups to changes in trophic state and climate. While the taxon based indices showed smooth changes, the function based index showed a dramatic shift from a raptorial to a microphagous dominance, with a back shift to raptorial dominance starting in 2000. The seasonal peak of microphagous and raptorial dry weight was clearly separated in the pre eutrophication period. When mesotrophic conditions prevailed both peaks overlapped Only to he separated again with re oligotrophication. We attributed these alterations of rotifer functional groups to changes in competition with crustacean zooplankton and to decreased phytoplankton algal abundance and size while altered seasonality in functional groups could be related to inter group competition fin. food. We hypothesise that the effects of trophic state i.e. altered phytoplankton and climate i.e. altered cladoceran community were transferred across trophic levels to rotifer functional groups. Our study highlights that functional groups are valid instruments for illustrating unifying principles in ecology through a better understanding of ecosystem processes and the interrelationship between trophic levels. 70 ID_PUMA cnr.ise/2011 A0 033 Response of rotifer functional groups to changing trophic state and crustacean community Response_of_rotifer_functional_groups_to_changing_trophic_state_and_crustacean_community.pdf Articolo in rivista Istituto per lo Studio degli Ecosistemi. 1129 5767 Journal of limnology Testo stamp. Journal of limnology Testo stamp. J. limnol. Testo stamp. Journal of limnology. Testo stamp. marinamarcella.manca MANCA MARINA MARCELLA DG.RSTL.094.012 Evoluzione della biodiversita e valutazione della banca degli stadi duraturi di organismi acquatici di laghi remoti