The nutritional quality of P‐limited algae for <i>Daphnia</i>

Boersma, Maarten

doi:10.4319/lo.2000.45.5.1157

Cited by 113 publications

(127 citation statements)

References 12 publications

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“…The laboratory temperature during both experiments was 16°C, which was the ambient temperature of the enclosures. For the laboratory experiment we used Daphnia magna, our standard test clone to test for food quality effects (Boersma, 2000). This clone was originally collected from a pond in Frankfurt and has been kept at the Max Planck Institute for Limnology for many years.…”

Section: Methodsmentioning

confidence: 99%

Differential Impacts of Copepods and Cladocerans on Lake Seston, and Resulting Effects on Zooplankton Growth

Becker

Feuchtmayr

Brepohl³

et al. 2004

Hydrobiologia

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In an enclosure study in Scho¨hsee, a small mesotrophic lake in Northern Germany, the impact of copepods and daphniids on the seston community was studied. In general, these two guilds differ in their feeding behaviour. Copepods actively select their food, with a preference for larger particles, whereas most cladocerans are unselective filter-feeders. In this study we investigate how the impact of the two different grazers affects zooplankton growth. We combine results obtained in the laboratory with results measured in situ in the enclosures. Copepods and cladocerans were cultured on seston from enclosures that were inhabited by density gradients of copepods or daphniids. We observed that Daphnia grew faster on seston that was pre-handled by copepods than on seston that was pre-handled by daphniids, and that somatic growth decreased with increasing densities of daphniids in the enclosures. In contrast, we observed no differences in development rates for copepods grown on the different media. The population growth rates of Daphnia in the Daphnia treatments were determined in the enclosures. Growth differences in both somaticand population growth of Daphnia were correlated to food quality aspects of the seston. In the laboratory we found that Daphnia growth was correlated with several fatty acids. The strongest regression was with the concentration of 20:4x3 (r 2 ¼ 0.37). This particular fatty acid also showed the highest correlation with growth after normalisation of the fatty acids to the carbon content of the enclosures (r 2 ¼ 0.33). On the other hand, in the enclosure the population growth correlated most to the particulate nitrogen content (r 2 ¼ 0.78) and only to the N:C ratio, when normalised to carbon (r 2 ¼ 0.51).

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Section: Methodsmentioning

confidence: 99%

Differential Impacts of Copepods and Cladocerans on Lake Seston, and Resulting Effects on Zooplankton Growth

Becker

Feuchtmayr

Brepohl³

et al. 2004

Hydrobiologia

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“…Berger-Parker index and density of large Daphnia are two indices for zooplankton. Daphnia had been introduced in the restoration area to graze algae and thus controlled eutrophication [35]. High density of large Daphnia was inverse to blue-green algae blooms.…”

Section: Metric Selectionmentioning

confidence: 99%

Assessing Aquatic Ecological Health for Lake Poyang, China: Part I Index Development

Huang

Gao

et al. 2018

Water

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Abstract:The development of an ecosystem health index to assess health status in freshwater lakes is urgently needed in China, especially in polluted lakes. This study developed a specific Ecosystem Health Index (LP-EHI) for Lake Poyang in China. LP-EHI quantified lake health from the perspectives of physical, chemical, biological integrity and social service. Physical integrity indices included hydrological conditions (water level and runoff), basic morphometric characteristics (lake area and shoreline), and tributary connectivity. Chemical integrity indices used water quality, nutrition, and toxicity to quantify chemical impairment. Biological integrity indicators covered six major components of the aquatic food chain, namely, phytoplankton, zooplankton, benthic macroinvertebrates, wetland plants, fish, and wintering birds. Social service indices included drinking water, pathogenic potential, flood storage capacity, sand mining, and dish-shaped sub-lake areas under management to measure whether the lake fulfilled the needs of human society. Reference and impaired conditions for each metric were defined by "historical" conditions, "least disturbed" conditions, national standards and expert opinions. The value of LP-EHI ranging from 0 to 1 was divided into five health conditions: excellent (≥0.8), good (0.6-0.8), fair (0.4-0.6), poor (0.2-0.4) and bad (<0.2). The metrics' reliability was further validated using a box-and-whisker plot test. The developed index (LP-EHI) is so far the most comprehensive index to evaluate ecosystem health for Lake Poyang, and is well reflected in the unique characteristics of Lake Poyang. It can enhance our understanding of lake health conditions and thus guide lake management to achieve better health conditions.

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“…Surplus carbon can be excreted through different mechanisms, ranging from increased activity (Plath and Boersma 2001) and respiration (Darchambeau et al 2003;Malzahn et al 2010) through changes in the digestion efficiency of carbon (DeMott and Tessier 2002). Whatever the mechanisms used, keeping homoeostasis and thus getting rid of excess carbon often comes at a cost to the herbivore and hence results in decreased growth and reproduction (Boersma 2000;Malzahn et al 2007). The pathways by which the consumers excrete the surplus carbon could have major consequences for the flow of energy and matter in the marine food web (Darchambeau et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Increased carbon dioxide availability alters phytoplankton stoichiometry and affects carbon cycling and growth of a marine planktonic herbivore

et al. 2012

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Rising levels of CO 2 in the atmosphere have led to increased CO 2 concentrations in the oceans. This enhanced carbon availability to the marine primary producers has the potential to change their nutrient stoichiometry, and higher carbon-to-nutrient ratios are expected. As a result, the quality of the primary producers as food for herbivores may change. Here, we present experimental work showing the effect of feeding Rhodomonas salina grown under different pCO 2 (200, 400 and 800 latm) on the copepod Acartia tonsa. The rate of development of copepodites decreased with increasing CO 2 availability to the algae. The surplus carbon in the algae was excreted by the copepods, with younger stages (copepodites) excreting most of their surplus carbon through respiration and adult copepods excreting surplus carbon mostly as DOC. We consider the possible consequences of different excretory pathways for the ecosystem. A continued increase in the CO 2 availability for primary production, together with changes in the nutrient loading of coastal ecosystems, may cause changes in the trophic links between primary producers and herbivores.

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The nutritional quality of P‐limited algae for Daphnia

Cited by 113 publications

References 12 publications

Differential Impacts of Copepods and Cladocerans on Lake Seston, and Resulting Effects on Zooplankton Growth

Differential Impacts of Copepods and Cladocerans on Lake Seston, and Resulting Effects on Zooplankton Growth

Assessing Aquatic Ecological Health for Lake Poyang, China: Part I Index Development

Increased carbon dioxide availability alters phytoplankton stoichiometry and affects carbon cycling and growth of a marine planktonic herbivore

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