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DatoValore
TitleTransfer of pollutants in lacustrine food webs: crustacean zooplankton as solely primary consumer?
AbstractCrustacean zooplankton have an important role in transfer of matter, energy, and pollutants through lacustrine food webs. In the open-water, crustacean zooplankters are a major link between phytoplankton primary producers and zooplanktivorous fish. The latter selectively feed on them, at least at the young stage. Despite being well-known as a non-homogeneous functional compartment, including both, primary and secondary consumers, zooplankters are often regarded, at least in ecotoxicological studies, as solely primary consumers. Regarding them as a single step in transfer of pollutants, however, may lead to temporary anomalies in estimates of concentration of pollutants. Such anomalies are often overlooked when annual means are applied resulting evident when seasonal changes in concentration of pollutants are measured. We provide results of a study on a deep subalpine lake, Lake Maggiore, in which distinction between zooplankton primary and secondary consumers was obtained by applying carbon and nitrogen stable isotopes analysis. In this lake, as in most deep, temperate, thermally stratified lakes, two phases in open water zooplankton seasonal succession can be identified: a first phase during which primary consumers prevail; a second phase in which secondary consumers prevail. Including the two steps of seasonal succession into conceptual ecotoxicological models is of crucial importance for reliable estimates of paths and mechanisms responsible in transferring persistent organic pollutants along the pelagic food web.
SourceSESF 8: VIII Symposium for European Freshwater Sciences, Muenster, Germania, 1-5 luglio 2013
KeywordsCrustacean zooplanktonPrimary and secondary consumersPersistent organic pollutantsStable isotope analysis
Year2013
TypePresentazione
AuthorsRoberta Piscia; Emanuela Boggio; Marina Manca; Silvana Galassi; Silvia Quadroni; Roberta Bettinetti
Text282553 2013 Crustacean zooplankton Primary and secondary consumers Persistent organic pollutants Stable isotope analysis Transfer of pollutants in lacustrine food webs crustacean zooplankton as solely primary consumer Roberta Piscia; Emanuela Boggio; Marina Manca; Silvana Galassi; Silvia Quadroni; Roberta Bettinetti Roberta Piscia; Emanuela Boggio; Marina Manca CNR ISE VB Silvana Galassi Universita degli Studi di Milano Silvia Quadroni; Roberta Bettinetti Universita degli Studi dell Insubria, Dipartimento di Scienze Chimiche e Ambientali, Como Crustacean zooplankton have an important role in transfer of matter, energy, and pollutants through lacustrine food webs. In the open water, crustacean zooplankters are a major link between phytoplankton primary producers and zooplanktivorous fish. The latter selectively feed on them, at least at the young stage. Despite being well known as a non homogeneous functional compartment, including both, primary and secondary consumers, zooplankters are often regarded, at least in ecotoxicological studies, as solely primary consumers. Regarding them as a single step in transfer of pollutants, however, may lead to temporary anomalies in estimates of concentration of pollutants. Such anomalies are often overlooked when annual means are applied resulting evident when seasonal changes in concentration of pollutants are measured. We provide results of a study on a deep subalpine lake, Lake Maggiore, in which distinction between zooplankton primary and secondary consumers was obtained by applying carbon and nitrogen stable isotopes analysis. In this lake, as in most deep, temperate, thermally stratified lakes, two phases in open water zooplankton seasonal succession can be identified a first phase during which primary consumers prevail; a second phase in which secondary consumers prevail. Including the two steps of seasonal succession into conceptual ecotoxicological models is of crucial importance for reliable estimates of paths and mechanisms responsible in transferring persistent organic pollutants along the pelagic food web. Published version In SEFS 8 VIII Symposium for European Freshwater Sciences Muenster, Germania, 1 5 luglio 2013 . SESF 8 VIII Symposium for European Freshwater Sciences Muenster, Germania 1 5 luglio 2013 Internazionale Contributo PPT PPT_SESF_Piscia_Transfer.pdf Presentazione BOGGIO EMANUELA roberta.piscia PISCIA ROBERTA marinamarcella.manca MANCA MARINA MARCELLA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici