Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | The population biology and life history traits of Eurasian ruffe [Gymnocephalus cernuus (L.), Pisces: Percidae] introduced into eutrophic and oligotrophic lakes in Northern Italy |
| Abstract | We describe the population biology and life-history traits of two Eurasian ruffe [Gymnocephalus cernuus (L.), Pisces: Percidae] populations which have recently colonised two small lakes in the lake Maggiore catchment of Northern Italy, the eutrophic lake (l.) Ghirla (ruffe first recorded in the early 1990s) and the oligotrophic l. Mergozzo (ruffe first recorded during the present sampling in 2010). Survey gill net catches revealed that ruffe has become one of the most abundant fish species in both lakes. Relative weight and weight-length relationships indicated better growth of ruffe in l. Mergozzo. Thus, gonad weight, adjusted for body size, was higher in l. Mergozzo, indicating a stronger individual reproductive potential in the more recently colonised lake. The stomach contents of ruffe were dominated by chironomid larvae and other benthic organisms, while pelagic microcrustaceans only occurred in small amounts. The ratio of benthic vs pelagic prey in the diet increased with ruffe size. Ruffe intraspecific food niche overlap (based on prey numbers) between age classes was slightly higher in oligotrophic l. Mergozzo than in eutrophic l. Ghirla and decreased with age in both lakes. |
| Source | Journal of limnology (Testo stamp.) 72 (2), pp. 280–290 |
| Keywords | Invasive alien speciesIntroductionsBiological pressuresPercidsDiets |
| Journal | Journal of limnology (Testo stamp.) |
| Editor | Istituto per lo Studio degli Ecosistemi., Verbania Pallanza, Italia |
| Year | 2013 |
| Type | Articolo in rivista |
| DOI | 10.4081/jlimnol.2013.e22 |
| Authors | Pietro Volta; Erik Jeppesen; Barbara Campi; Paolo Sala; Matthias Emmrich; Ian J. Winfield |
| Text | 288153 2013 10.4081/jlimnol.2013.e22 ISI Web of Science WOS 000324045100007 Invasive alien species Introductions Biological pressures Percids Diets The population biology and life history traits of Eurasian ruffe Gymnocephalus cernuus L. , Pisces Percidae introduced into eutrophic and oligotrophic lakes in Northern Italy Pietro Volta; Erik Jeppesen; Barbara Campi; Paolo Sala; Matthias Emmrich; Ian J. Winfield Pietro Volta; Barbara Campi; Paolo Sala CNR Inst Ecosyst Study; Erik Jeppesen Aarhus University; Matthias Emmrich Leibniz Inst Freshwater Ecol Inland Fisheries; Ian J. Winfield NERC Centre for Ecology Hydrology We describe the population biology and life history traits of two Eurasian ruffe Gymnocephalus cernuus L. , Pisces Percidae populations which have recently colonised two small lakes in the lake Maggiore catchment of Northern Italy, the eutrophic lake l. Ghirla ruffe first recorded in the early 1990s and the oligotrophic l. Mergozzo ruffe first recorded during the present sampling in 2010 . Survey gill net catches revealed that ruffe has become one of the most abundant fish species in both lakes. Relative weight and weight length relationships indicated better growth of ruffe in l. Mergozzo. Thus, gonad weight, adjusted for body size, was higher in l. Mergozzo, indicating a stronger individual reproductive potential in the more recently colonised lake. The stomach contents of ruffe were dominated by chironomid larvae and other benthic organisms, while pelagic microcrustaceans only occurred in small amounts. The ratio of benthic vs pelagic prey in the diet increased with ruffe size. Ruffe intraspecific food niche overlap based on prey numbers between age classes was slightly higher in oligotrophic l. Mergozzo than in eutrophic l. Ghirla and decreased with age in both lakes. 72 Published version Articolo 2013_Journal_of_Limnol_72_2_280_290.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. SALA PAOLO CAMPI BARBARA pietro.volta VOLTA PIETRO TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |