title: Grazer diversity effects in an eelgrass-epiphyte-microphytobenthos system.
abstract: The dramatic loss of biodiversity and its consequences for ecosystem processes have been of considerable interest in recent ecological studies. However, the complex and interacting processes influencing diversity effects in multitrophic systems are still poorly understood. We used an experimental eelgrass system to study the effects of changing richness of three consumer species on the biomass, diversity and taxonomic composition of both epiphytic and benthic microalgal assemblages. After 1 week, consumer richness enhanced the grazing impact on epiphyte biomass relative to single consumer treatments and a positive effect of consumer richness on prey diversity was found. Moreover, strong effects of consumer species identity on taxonomic composition were found in both microalgal assemblages. However, the effects of consumer richness were not consistent over time. The consequences of high nutrient availability seemed to have masked consumer richness effects.
authors.affiliation: Experimental Ecology, IFM-GEOMAR Leibniz Institute of Marine Sciences, Düsternbrooker Weg 20, 24105 Kiel, Germany. sjaschinski@ifm-geomar.de
authors.forename: Sybill
authors.initials: S
authors.lastname: Jaschinski
authors.forename: Nicole
authors.initials: N
authors.lastname: Aberle
authors.forename: Sandra
authors.initials: S
authors.lastname: Gohse-Reimann
authors.forename: Heinz
authors.initials: H
authors.lastname: Brendelberger
authors.forename: Karen H
authors.initials: KH
authors.lastname: Wiltshire
authors.forename: Ulrich
authors.initials: U
authors.lastname: Sommer
mesh_terms: D044822:Biodiversity; D017753:Ecosystem; D056890:Eukaryota / Q000254:growth & development; D008386:Marine Biology; D006109:Poaceae