Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Morphological variation and life history changes of a Daphnia hyalina population exposed to Chaoborus flavicans predation (L. Candia, Northern Italy). |
| Abstract | The response of Daphnia populations to invertebrate predators involves morphological changes and can lead to a trade-off between growth- and reproduction-related traits. The effects of Chaoborus flavicans larvae on the Daphnia hyalina population in Lake Candia were investigated by comparing the morphometric characteristics and life history traits of the preys during one year with low predator density and one year with a ten fold higher predator density. The increase in Chaoborus density seems to have induced morphological changes in Daphnia hyalina which enabled the modified morph to coexist with the predator. The predator impact did not result in any apparent shift in body size pattern of the prey population, while an increase in average clutch size and a tendency towards a decrease in size at first reproduction suggests the possibility of a predator-mediated shift in life history traits. |
| Source | Journal of limnology (Online) 61 (1), pp. 41–48 |
| Keywords | DaphniaChaoborusLake Candiabody sizeclutch size |
| Journal | Journal of limnology (Online) |
| Editor | Istituto per lo Studio degli Ecosistemi, Pavia, Italia |
| Year | 2002 |
| Type | Articolo in rivista |
| Authors | Riccardi N., Giussani G., Lagorio L. (1) |
| Text | 224280 2002 Daphnia Chaoborus Lake Candia body size clutch size Morphological variation and life history changes of a Daphnia hyalina population exposed to Chaoborus flavicans predation L. Candia, Northern Italy . Riccardi N., Giussani G., Lagorio L. 1 CNR Istituto per lo Studio degli Ecosistemi, Largo Tonolli 50, 28922 Verbania Pallanza, Italy 1 Institut Universitaire de Technologie, Departement Genie Biologique, Universite de Toulon et du Var, BP 132, 83957 La Garde Cedex, France The response of Daphnia populations to invertebrate predators involves morphological changes and can lead to a trade off between growth and reproduction related traits. The effects of Chaoborus flavicans larvae on the Daphnia hyalina population in Lake Candia were investigated by comparing the morphometric characteristics and life history traits of the preys during one year with low predator density and one year with a ten fold higher predator density. The increase in Chaoborus density seems to have induced morphological changes in Daphnia hyalina which enabled the modified morph to coexist with the predator. The predator impact did not result in any apparent shift in body size pattern of the prey population, while an increase in average clutch size and a tendency towards a decrease in size at first reproduction suggests the possibility of a predator mediated shift in life history traits. 61 Morphological variation and life history changes of a Daphnia hyalina population exposed to Chaoborus flavicans predation L. Candia, Northern Italy . 04_Riccardi_Giussani_Lagorio.pdf Articolo in rivista Istituto per lo Studio degli Ecosistemi 1723 8633 Journal of limnology Online Journal of limnology Online J. limnol. Online Journal of limnology. Online gianluigi.giussani GIUSSANI GIANLUIGI nicolettarita.riccardi RICCARDI NICOLETTA RITA |