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Varão Moura A, Aparecido Rosini Silva A, Domingos Santo da Silva J, Aleixo Leal Pedroza L, Bornhorst J, Stiboller M, Schwerdtle T, Gubert P. Determination of ions in Caenorhabditis elegans by ion chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2022; 1204:123312. [DOI: 10.1016/j.jchromb.2022.123312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 05/04/2022] [Accepted: 05/25/2022] [Indexed: 11/27/2022]
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van der Lee GH, Vonk JA, Verdonschot RCM, Kraak MHS, Verdonschot PFM, Huisman J. Eutrophication induces shifts in the trophic position of invertebrates in aquatic food webs. Ecology 2020; 102:e03275. [PMID: 33351184 PMCID: PMC7988625 DOI: 10.1002/ecy.3275] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 09/11/2020] [Accepted: 10/26/2020] [Indexed: 11/13/2022]
Abstract
Changes in the ecological stoichiometry of primary producers may have considerable implications for energy and matter transfer in food webs. We hypothesized that nutrient enrichment shifts the trophic position of omnivores towards herbivory, as the nutritional quality of primary producers increases. This hypothesis was tested by analyzing the ecological stoichiometry and stable isotope signature of primary producers and a wide range of aquatic macroinvertebrates, including primary consumers (herbivores) and secondary consumers (both potential omnivores and strict carnivores), along a eutrophication gradient in an agricultural landscape. Our results showed (1) that carbon : nutrient ratios of primary producers decreased along the eutrophication gradient, while the elemental composition of consumers remained homeostatic, and (2) that the trophic position of several omnivores and the generalist predator Notonecta decreased, while the trophic position of most other consumers remained constant. These findings suggest that shifts in the diets of aquatic invertebrates induced by increasing eutrophication may affect species interactions and food web structure in aquatic ecosystems.
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Affiliation(s)
- Gea H van der Lee
- Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94240, Amsterdam, 1090 GE, The Netherlands.,Wageningen Environmental Research, Wageningen UR, P.O. Box 47, Wageningen, 6700 AA, The Netherlands
| | - J Arie Vonk
- Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94240, Amsterdam, 1090 GE, The Netherlands
| | - Ralf C M Verdonschot
- Wageningen Environmental Research, Wageningen UR, P.O. Box 47, Wageningen, 6700 AA, The Netherlands
| | - Michiel H S Kraak
- Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94240, Amsterdam, 1090 GE, The Netherlands
| | - Piet F M Verdonschot
- Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94240, Amsterdam, 1090 GE, The Netherlands.,Wageningen Environmental Research, Wageningen UR, P.O. Box 47, Wageningen, 6700 AA, The Netherlands
| | - Jef Huisman
- Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94240, Amsterdam, 1090 GE, The Netherlands
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Patočka J, Krejčová A, Stojarová K, Hrdá K, Pouzar M. The ICP-OES method for determination of zinc in Enchytraeus crypticus and agarose gel from ecotoxicological tests. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0563-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Evaluation of three methods for biomass estimation in small invertebrates, using three large disparate parasite species as model organisms. Sci Rep 2018; 8:3897. [PMID: 29497143 PMCID: PMC5832816 DOI: 10.1038/s41598-018-22304-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 02/21/2018] [Indexed: 12/05/2022] Open
Abstract
Invertebrate biomass is considered one of the main factors driving processes in ecosystems. It can be measured directly, primarily by weighing individuals, but more often indirect estimators are used. We developed two indirect and non-destructive approaches to estimate biomass of small invertebrates in a simple manner. The first one was based on clay modelling and the second one was based on image analysis implemented with open-source software. Furthermore, we tested the accuracy of the widely used geometric approximation method (third method). We applied these three different methods to three morphologically disparate model species, an acanthocephalan worm, a crustacean and a flatworm. To validate our indirect estimations and to test their accuracy, we weighed specimens of the three species and calculated their tissue densities. Additionally, we propose an uncomplicated technique to estimate thickness of individuals under a microscope, a required measurement for two of the three indirect methods tested. The indirect methods proposed in this paper provided the best approximation to direct measurements. Despite its wide use, the geometric approximation method showed the lowest accuracy. The approaches developed herein are timely because the recently increasing number of studies requiring reliable biomass estimates for small invertebrates to explain crucial processes in ecosystems.
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