Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Corbicula fluminea ivasion in Lake Maggiore (Italy): population dynamics and comparison of dietary overlap with native mussels |
| Abstract | The Asian clam, Corbicula fluminea (Müller, 1774), was most likely introduced in 2007 in Lake Maggiore, the second largest and deepest lake in Italy. Spatial and temporal variations in abundance, biomass and population structure of C. fluminea at 5 sites, investigated since its first discovery in 2010, confirmed the well known ability of this species rapidly to spread in new recipient environments and to achieve densities of thousands per square meter. In few years Corbicula has colonized about one third of the lake littoral area and has become the dominant littoral benthic species in terms of abundance and biomass, creating the conditions for a competitive interaction for space and food with native mussels. Indeed, a comparison with previous data has evidenced a strong decline of the most abundant native mussel species (Unio mancus), whose actual density is reduced of about 75% after Corbicula invasion. Although native mussel depletion cannot be unequivocally attributed to Corbicula impact, the change in bivalve species dominance could lead to changes in the structure and function of the ecosystem. In spite of similar functional roles, unionids and C. fluminea are likely to differ in filtering efficiency and trophic niche. Therefore, understanding the role that both native and invasive species play in food-web structure and nutrient cycling is essential for predicting how the ecosystem might be altered. Our study aimed to: (i) explore the invasion dynamics of Corbicula in Lake Maggiore; (ii) compare the trophic roles of the native mussel U. mancus and C. fluminea through measurements of respective filtration rates and spectrum of food resources. Filtration rates were measured by the clearance method under different experimental conditions and over the whole diurnal cycle. Dietary composition and overlap were determined through the measurement of the elemental and stable isotopic compositions (?13C and ?15N) of the respective tissues. |
| Source | IMBCF - International Meeting Biology & Conservation of Freshwater Bivalves, Braganca, Portogallo, 4-7 settembre 2012 |
| Keywords | Freshwater BivalvesInvasive alien speciesDietary compositionClearance rates |
| Year | 2012 |
| Type | Abstract in atti di convegno |
| Authors | Nicoletta Riccardi; Rosaria Lauceri; Nicoletta Guerrieri; Lyudmila Kamburska; Irene Guarnieri; Alice Cardeccia; Paolo Ferin; Angela Boggero; Marina Manca |
| Text | 329684 2012 Freshwater Bivalves Invasive alien species Dietary composition Clearance rates Corbicula fluminea ivasion in Lake Maggiore Italy population dynamics and comparison of dietary overlap with native mussels Nicoletta Riccardi; Rosaria Lauceri; Nicoletta Guerrieri; Lyudmila Kamburska; Irene Guarnieri; Alice Cardeccia; Paolo Ferin; Angela Boggero; Marina Manca CNR ISE A. Teixeira, M. Lopes Lima, S. Varandas, R. Sousa, E. Froufe F. Teiga 978 972 745 139 5 Published version IMBCF International Meeting Biology Conservation of Freshwater Bivalves Braganca, Portogallo 4 7 settembre 2012 Internazionale Contributo The Asian clam, Corbicula fluminea Muller, 1774 , was most likely introduced in 2007 in Lake Maggiore, the second largest and deepest lake in Italy. Spatial and temporal variations in abundance, biomass and population structure of C. fluminea at 5 sites, investigated since its first discovery in 2010, confirmed the well known ability of this species rapidly to spread in new recipient environments and to achieve densities of thousands per square meter. In few years Corbicula has colonized about one third of the lake littoral area and has become the dominant littoral benthic species in terms of abundance and biomass, creating the conditions for a competitive interaction for space and food with native mussels. Indeed, a comparison with previous data has evidenced a strong decline of the most abundant native mussel species Unio mancus , whose actual density is reduced of about 75% after Corbicula invasion. Although native mussel depletion cannot be unequivocally attributed to Corbicula impact, the change in bivalve species dominance could lead to changes in the structure and function of the ecosystem. In spite of similar functional roles, unionids and C. fluminea are likely to differ in filtering efficiency and trophic niche. Therefore, understanding the role that both native and invasive species play in food web structure and nutrient cycling is essential for predicting how the ecosystem might be altered. Our study aimed to i explore the invasion dynamics of Corbicula in Lake Maggiore; ii compare the trophic roles of the native mussel U. mancus and C. fluminea through measurements of respective filtration rates and spectrum of food resources. Filtration rates were measured by the clearance method under different experimental conditions and over the whole diurnal cycle. Dietary composition and overlap were determined through the measurement of the elemental and stable isotopic compositions 13C and 15N of the respective tissues. Abstract 2012_Abstract_IMBCF_39.pdf Abstract in atti di convegno lyudmilatodorova.kamburska KAMBURSKA LYUDMILA TODOROVA angela.boggero BOGGERO ANGELA rosaria.lauceri LAUCERI ROSARIA nicolettarita.riccardi RICCARDI NICOLETTA RITA nicoletta.guerrieri GUERRIERI NICOLETTA marinamarcella.manca MANCA MARINA MARCELLA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |