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The effect of seasonal variation in selective feeding by zebra mussels (Dreissena polymorpha) on phytoplankton community composition
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
2007 (engelsk)Inngår i: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 52, nr 5, s. 823-842Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

To investigate the impact of zebra mussels (Dreissena polymorpha) on phytoplankton community composition, temporal variability in selective feeding by the mussels was determined from April to November 2005 in a natural lake using Delayed Fluorescence (DF) excitation spectroscopy. Selective grazing by zebra mussels varied in relation to seasonal phytoplankton dynamics; mussels showed a consistent preference for cryptophytes and avoidance of chlorophytes and cyanobacteria. Diatoms, chrysophytes and dinoflagellates responded differentially to zebra mussel grazing depending on their size. Analysis of excreted products of the zebra mussels revealed that in addition to chlorophytes and cyanobacteria, phytoplankton >50 μm and very small phytoplankton (≤7 μm) were largely expelled in pseudofaeces. The zebra mussel is a selective filter-feeder that alters its feeding behaviour in relation to phytoplankton composition to capture and ingest high quality phytoplankton, especially when phytoplankton occur in preferred size ranges. Flexibility of zebra mussel feeding behaviour and variation in susceptibility among phytoplankton groups to mussel ingestion indicate that invading zebra mussels could alter phytoplankton community composition of lakes and have important ecosystem consequences.

sted, utgiver, år, opplag, sider
2007. Vol. 52, nr 5, s. 823-842
Emneord [en]
Delayed Fluorescence, Lake Erken, phytoplankton dynamics, selective feeding, Zebra mussel
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-96406DOI: 10.1111/j.1365-2427.2007.01732.xISI: 000245987200005OAI: oai:DiVA.org:uu-96406DiVA, id: diva2:170971
Tilgjengelig fra: 2007-11-14 Laget: 2007-11-14 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. The Invasion of the Zebra Mussel - Effects on Phytoplankton Community Structure and Ecosystem Function
Åpne denne publikasjonen i ny fane eller vindu >>The Invasion of the Zebra Mussel - Effects on Phytoplankton Community Structure and Ecosystem Function
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Biological invasion has become a major threat to economy, ecology, global biodiversity and ecosystem function of aquatic ecosystems. The main aim of the thesis was to study the effects of the zebra mussel (Dreissena polymorpha), a versatile invasive species, on phytoplankton dynamics and ecosystem function of lakes.

In a first attempt, I compared the density of Dreissena and the physicochemical data of ecosystems that it invaded among North American and European lakes to identify important factors in its invasion success. Secondly, I investigated the impact of zebra mussels on phytoplankton community composition in a natural lake. Thirdly, I evaluated whether zebra mussel feeding behavior were affected by the presence of predatory waterborne cues. Finally, I examined the effect of Dreissena on seston stoichiometry.

A Generalized Additive Model revealed that a joint effect of surface area, mean depth, total phosphorus and calcium concentrations can explain the variability in Dreissena density. Selective grazing by zebra mussels varied in relation to seasonal phytoplankton dynamics. Risk cues released by predators affected both feeding rate and prey selection of the mussels and had cascading indirect effects on phytoplankton biomass and community structure. I found that the flux in nutrients caused by differences in zebra mussel consumption lead to a variation in phytoplankton nutrient limitation.

The flexibility of zebra mussel feeding behavior and variation in susceptibility among phytoplankton groups to mussel ingestion indicate that invading zebra mussels could alter phytoplankton community composition of lakes and have important ecosystem consequences. The results of this thesis contribute to the growing evidence that predators indirectly affect resource dynamics and food web structure through their non-lethal effects on consumers. The results suggested that zebra mussel can indirectly both reduce and increase the energy transfer efficiency from primary producers to upper trophic levels in the pelagic and benthic food webs, respectively.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2007. s. 54
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 361
Emneord
Invasive species, Zebra mussel, Invasion success, Selective feeding, Non-lethal effects of predator, Seston stoichiometry, Delayed fluorescence excitation spectroscopy, Phytoplankton dynamics, Trait-mediated indirect interaction, Ecosystem function
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-8301 (URN)978-91-554-7015-9 (ISBN)
Disputas
2007-12-06, Lindahlssalen, Kärnhuset, EBC, Norbyvägen, Uppsala, 13:00
Opponent
Veileder
Tilgjengelig fra: 2007-11-14 Laget: 2007-11-14 Sist oppdatert: 2016-04-28bibliografisk kontrollert

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