Reversal of density dependence of juvenile Littorina littorea (Gastropoda) growth in response to periphyton nutrient status.

Sommer, Ulrich (2001) Reversal of density dependence of juvenile Littorina littorea (Gastropoda) growth in response to periphyton nutrient status. Journal of Sea Research, 45 (2). pp. 95-103. DOI 10.1016/S1385-1101(01)00051-X.

[img] Text
sommer.pdf - Published Version
Restricted to Registered users only

Download (422Kb) | Contact

Supplementary data:

Abstract

Experimental periphyton communities were grown 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 of juvenile 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 with Littorina 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.

Document Type: Article
Keywords: Food Webs; Herbivory; Littorina; Periphyton; Food quality; Benthos
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S1385-1101(01)00051-X
ISSN: 1385-1101
Date Deposited: 22 Mar 2012 14:05
Last Modified: 14 Jul 2017 11:04
URI: http://oceanrep.geomar.de/id/eprint/14084

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...