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Effects of the zebra mussel, an exotic freshwater species, on seston stoichiometry
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.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.ORCID-id: 0000-0002-8981-1453
2008 (Engelska)Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 53, nr 5, s. 1973-1987Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We examined the effect of the zebra mussel, Dreissena polymorpha, an exotic species, on seston stoichiometry by conducting laboratory experiments in which we varied nutrient composition of seston and mussels over time. Zebra mussels altered the stoichiometry of seston through removal of particulate organic nutrients and changed the stoichiometry of the dissolved nutrient pool through nutrient excretion. Grazers had stronger effects on carbon : phosphorus (C : P) and nitrogen (N) : P ratios than on the C:N ratio of seston. Elemental residence time in tissue and high mass-specific nutrient excretion by small mussels caused small mussels to be more efficient nutrient recyclers than larger mussels. Zebra mussels reduced P availability through enhancing C: P and N: P molar ratios of seston during the period extending from June to August, when P was limited in the lake, and increased the C:N molar ratio of seston in June, when N was at the minimum level in the lake. C: P and N: P molar ratios for zebra mussel tissue were higher in August and somewhat in September than in all other months. N was retained more efficiently than P in Dreissena tissue. Nutrient mass-specific uptake rate was higher than excretion rate by zebra mussels.

Ort, förlag, år, upplaga, sidor
American Society of Limnology and Oceanography, 2008. Vol. 53, nr 5, s. 1973-1987
Nationell ämneskategori
Ekologi Fisk- och akvakulturforskning
Identifikatorer
URN: urn:nbn:se:uu:diva-96408DOI: 10.4319/lo.2008.53.5.1973ISI: 000259356000024OAI: oai:DiVA.org:uu-96408DiVA, id: diva2:170973
Tillgänglig från: 2007-11-14 Skapad: 2007-11-14 Senast uppdaterad: 2024-04-25Bibliografiskt granskad
Ingår i avhandling
1. The Invasion of the Zebra Mussel - Effects on Phytoplankton Community Structure and Ecosystem Function
Öppna denna publikation i ny flik eller fönster >>The Invasion of the Zebra Mussel - Effects on Phytoplankton Community Structure and Ecosystem Function
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
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
Nyckelord
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
Nationell ämneskategori
Ekologi
Identifikatorer
urn:nbn:se:uu:diva-8301 (URN)978-91-554-7015-9 (ISBN)
Disputation
2007-12-06, Lindahlssalen, Kärnhuset, EBC, Norbyvägen, Uppsala, 13:00
Opponent
Handledare
Tillgänglig från: 2007-11-14 Skapad: 2007-11-14 Senast uppdaterad: 2022-01-28Bibliografiskt granskad

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Naddafi, RahmatPettersson, KurtEklöv, Peter

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