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Titolo:
Interaction between coot (Fulica atra) and waterlily (Nymphaea alba) in a lake: the indirect impact of foraging
Autore:
Paillisson, JM; Marion, L;
Indirizzi:
Univ Rennes 1, Lab Evolut Syst Nat & Modifies, UMR Ecobio 6553, F-35042 Rennes, France Univ Rennes 1 Rennes France F-35042 Ecobio 6553, F-35042 Rennes, France
Titolo Testata:
AQUATIC BOTANY
fascicolo: 3, volume: 71, anno: 2001,
pagine: 209 - 216
SICI:
0304-3770(200111)71:3<209:IBC(AA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUBMERGED MACROPHYTES; EUTROPHIC LAKE; WATERFOWL; HERBIVORY;
Keywords:
waterplant-herbivore interactions; omnivory; indirect feeding effects; shallow lakes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Paillisson, JM Univ Rennes 1, Lab Evolut Syst Nat & Modifies, UMR Ecobio 6553, Campus Beaulieu, F-35042 Rennes, France Univ Rennes 1 Campus Beaulieu Rennes France F-35042 France
Citazione:
J.M. Paillisson e L. Marion, "Interaction between coot (Fulica atra) and waterlily (Nymphaea alba) in a lake: the indirect impact of foraging", AQUATIC BOT, 71(3), 2001, pp. 209-216

Abstract

A previously unrecorded indirect impact is described of coot (Fulica atra)on a floating-leaved species (Nymphaea alba) during the plant growing season in a shallow eutrophic natural freshwater ecosystem, Lake Grand-Lieu, western France. The bird population was counted, the proportion of petioles cut by bird was estimated and the density of the four main invertebrate groups on the leaves was measured just after the breeding season, in July and then in September 1997 in the whole N. alba area (739 ha divided into 15 sections). Up to 6 +/- 1% of leaves were cut in July, with differences betweensections (from 0.3 +/- 0.1 to 16 +/- 6%) when about 10,000 coots fed in this part of the lake. A positive relationship was recorded between the proportion of cut petioles and coot density during the first period (excluding sections where N. alba was mixed with another plant species, Trapa natans). In September, coot abundance fell to 5000 individuals and the impact decreased to 0.3 +/- 0.2% of leaves, new generations of leaves having meanwhile grown. The comparison of the mean density of invertebrates on cut and intactleaves showed a massive depletion of the beetle, Galerucella nymphaeae, present on the upper side of the leaves. The selection of this specific food item might explain this marked interaction, which was nevertheless insignificant in September because of high turn over rates of the plant. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:11:24