Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | The relevance of life-history traits in the establishment of the invader Eudiaptomus gracilis and the extinction of Eudiaptomus padanus in Lake Candia (Northern Italy): evidence for competitive exclusion? |
| Abstract | The niches invaded by exotic species are generally not entirely vacant, and one possible factor affecting the success of the invader to establish a permanent large population may be the ability of the former to outcompete native species. Eudiaptomus gracilis, which was not present in Italy before the 1980s, is becoming established in an increasing number of Northern Italian lakes, ultimately replacing the endemic E. padanus. Coexistence of the two species in Lake Candia lasted only 7 months, suggesting that species replacement was determined either by environmental changes or by strong competition. To assess whether the potential for interspecific competition existed and to identify species' traits which could explain the competitive superiority of E. gracilis, we examined field seasonal patterns, reproductive parameters and body size of the two species. E. padanus abundance was probably reduced by predation and parasitism, which favoured the displacement of the species shortly after invasion by E. gracilis. The temporarily underexploited niche provided an opportunity for the successful establishment of the invader. The reproductive patterns of the two species were found to be similar in most of their features, with the exception of a markedly larger clutch size and a smaller egg volume in the resident species. By contrast, the invader showed a higher adult:egg ratio and a lower death rate. Thus, despite the greater fecundity of E. padanus, the competitive success of the invader might be attributable to interspecific differences in developmental rates and/or juvenile mortality. |
| Source | Aquatic ecology (Print) 41 (2), pp. 243–254 |
| Keywords | Copepodsinterspecific competitioninvasionslife-history strategyreproductive traits |
| Journal | Aquatic ecology (Print) |
| Editor | Kluwer Academic Publishers, Boston, Paesi Bassi |
| Year | 2007 |
| Type | Articolo in rivista |
| DOI | 10.1007/s10452-006-9061-3 |
| Authors | Riccardi N., Giussani G. |
| Text | 52925 2007 10.1007/s10452 006 9061 3 ISI Web of Science WOS 000248109100010 Scopus 2 s2.0 34447632635 Copepods interspecific competition invasions life history strategy reproductive traits The relevance of life history traits in the establishment of the invader Eudiaptomus gracilis and the extinction of Eudiaptomus padanus in Lake Candia Northern Italy evidence for competitive exclusion Riccardi N., Giussani G. CNR Institute of Ecosystem Study, Largo Tonolli 50, 28922 Verbania Pallanza, Italy The niches invaded by exotic species are generally not entirely vacant, and one possible factor affecting the success of the invader to establish a permanent large population may be the ability of the former to outcompete native species. Eudiaptomus gracilis, which was not present in Italy before the 1980s, is becoming established in an increasing number of Northern Italian lakes, ultimately replacing the endemic E. padanus. Coexistence of the two species in Lake Candia lasted only 7 months, suggesting that species replacement was determined either by environmental changes or by strong competition. To assess whether the potential for interspecific competition existed and to identify species traits which could explain the competitive superiority of E. gracilis, we examined field seasonal patterns, reproductive parameters and body size of the two species. E. padanus abundance was probably reduced by predation and parasitism, which favoured the displacement of the species shortly after invasion by E. gracilis. The temporarily underexploited niche provided an opportunity for the successful establishment of the invader. The reproductive patterns of the two species were found to be similar in most of their features, with the exception of a markedly larger clutch size and a smaller egg volume in the resident species. By contrast, the invader showed a higher adult egg ratio and a lower death rate. Thus, despite the greater fecundity of E. padanus, the competitive success of the invader might be attributable to interspecific differences in developmental rates and/or juvenile mortality. 41 The relevance of life history traits in the establishment of the invader Eudiaptomus gracilis and the extinction of Eudiaptomus padanus in Lake Candia Northern Italy evidence for competitive exclusion Articolo pubblicato Riccardi_Giussani_2007.pdf Articolo in rivista Kluwer Academic Publishers 1386 2588 Aquatic ecology Print Aquatic ecology Print Aquat. ecol. Print Aquatic ecology. Print nicolettarita.riccardi RICCARDI NICOLETTA gianluigi.giussani GIUSSANI GIANLUIGI TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |