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Titolo:
Reversal of density dependence of juvenile Littorina littorea (Gastropoda)growth in response to periphyton nutrient status
Autore:
Sommer, U;
Indirizzi:
Inst Meereskunde, D-24105 Kiel, Germany Inst Meereskunde Kiel Germany D-24105 Meereskunde, D-24105 Kiel, Germany
Titolo Testata:
JOURNAL OF SEA RESEARCH
fascicolo: 2, volume: 45, anno: 2001,
pagine: 95 - 103
SICI:
1385-1101(200105)45:2<95:RODDOJ>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
DAPHNIA GROWTH; BALTIC SEA; LIMITATION; ZOOPLANKTON; COMPETITION; DIVERSITY; QUALITY;
Keywords:
herbivory; Littorina; periphyton; food quality; benthos;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Sommer, U Inst Meereskunde, Dusternbrooker Weg, D-24105 Kiel, Germany InstMeereskunde Dusternbrooker Weg Kiel Germany D-24105 ermany
Citazione:
U. Sommer, "Reversal of density dependence of juvenile Littorina littorea (Gastropoda)growth in response to periphyton nutrient status", J SEA RES, 45(2), 2001, pp. 95-103

Abstract

Experimental periphyton communities were frown in aquaria receiving media of differently enriched seawater (fully enriched, without Si enrichment, without N and P enrichment) and supplied differently with medium (batch and weekly replacement), Periphyton was subject to grazing by 1-6 individuals ofjuvenile Littorina littorea. Periphyton biomass was higher in the replacement aquaria than in the batch aquaria and higher in the full and the -Si medium than in the -NP medium. The N:C ratio of the periphyton increased withLittorina number in the batch aquaria and was unaffected by Littorina number in the replacement aquaria. Diatoms were most dominant in the -NP treatments and rarest in the -Si treatments. Chlorophytes were dominant in the -Si and the fully enriched treatments, but also Cyanobacteria contributed significantly to periphyton biomass in those treatments under nutrient replacement. Somatic growth of Littorina was negatively correlated to Littorina density in the replacement aquaria and positively density dependent in the batch aquaria. The latter is explained by improved food quality under stronger grazing pressure. (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 09/04/20 alle ore 05:46:54