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Kilham, Susan S.; Kreeger, Daniel A.; Lynn, Scott G.; Goulden, Clyde E.; Herrera, Lazaro

doi:10.1023/a:1003231628456

Cited by 751 publications

(217 citation statements)

References 21 publications

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“…brightwellii were obtained from wetting of dried sediment collected from a freshwater pond (39°57′N; 116°21′E) in Beijing, China, following the methods of previous studies 42, 46 . One newly hatched female Brachionus or Asplanchna was isolated and allowed to reproduce parthenogenetically in the COMBO medium 47 enriched with 40 ml L −1 soil water extract 40 (hereafter COMBO). Brachionus was cultured with the food alga Chlorella pyrenoidosa , which was also cultured in COMBO, at a concentration of 1.0 mg C L −1 .…”

Section: Methodsmentioning

confidence: 99%

Hidden defensive morphology in rotifers: benefits, costs, and fitness consequences

Yin

Jin

Zhou

et al. 2017

Sci Rep

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To cope with predation, many prey species have developed inducible defenses in terms of morphology, behavior, and life history. Rotifers were the first model organisms used to evaluate the ecology and evolution of inducible defenses in aquatic ecosystems. Since the middle of last century, only visible morphological defenses, such as spine development, have been found and only in a few rotifer species. Given the development of ultrastructural defenses is taxonomically widespread in aquatic ecosystems, we hypothesize that rotifer prey, particularly small-sized species, can develop such inducible defenses. We evaluated morphological response of two common Brachionus herbivores (B. calyciflorus and B. angularis) to predatory rotifer Asplanchna brightwellii. Results confirmed existence of predator-induced ultrastructural defenses, which are expressed as increased lorica thickness and enhanced lorica hardness. Such inducible defenses are more evident and effective in the smaller sized B. angularis, leading to higher fitness of B. angularis in predator-prey interactions. As anticipated, development of defenses has inevitable fitness costs manifested as decreased reproduction or reduced sex investment. Our results not only extend understanding of inducible ultrastructural defense to other planktonic taxa that were previously observed only in cladocerans, but also verify effective mechanical protection of such hidden defensive morphology.

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Section: Methodsmentioning

confidence: 99%

Hidden defensive morphology in rotifers: benefits, costs, and fitness consequences

Yin

Jin

Zhou

et al. 2017

Sci Rep

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“…The food algae, Pseudokirchneriella subcapitata Korschikov, was grown in continuous chemostats in sterile COMBO medium [51] as described by Wojewodzic et al . [52].…”

Section: Methodsmentioning

confidence: 99%

Phosphorus limitation enhances parasite impact: feedback effects at the population level

2014

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BackgroundNutrient deficiency affects the growth and population dynamics of consumers. Endoparasites can be seen as consumers that drain carbon (C) or energy from their host while simultaneously competing for limiting resources such as phosphorus (P). Depending on the relative demands of the host and the parasite for the limiting nutrient, intensified resource competition under nutrient limitation can either reduce the parasite’s effect on the host or further reduce the fitness of the nutrient-limited host. So far, knowledge of how nutrient limitation affects parasite performance at the host population level and how this affects the host populations is limited.ResultsWe followed the population growth of Daphnia magna that were uninfected or experimentally infected with a microsporidian, Glugoides intestinalis. The Daphnia were fed either P-sufficient or P-limited algae. The P-limited diet decreased the population density and biomass compared with the populations fed with the P-sufficient algae. In the P-sufficient populations, infection with the parasite reduced the population density but not the biomass of Daphnia, while in the P-limited populations, both the density and biomass of Daphnia decreased toward the end of the 32 day experiment compared with the uninfected controls. The infected animals from the P-limited populations had higher parasite spore cluster counts, while, in a separate experiment, host diet quality did not affect the number of parasites in individually kept Daphnia.ConclusionsBecause host diet quality did not affect parasite numbers at the individual level, we suggest that the higher parasite load in the P-limited populations is a result of feedback effects arising at the population level. Because of the density-dependent transmission of the parasite and the time lag between exposure and transmission, the lower host population density in the P-limited populations led to a higher spore:host ratio. This effect may have been further reinforced by decreases in filtration rates caused by crowding in the P-sufficient populations and/or increases in filtration rates as a response to poor food quality in the P-limited populations. The increases in exposure led to a higher parasite load and aggravated the negative effects of parasite infection at the population level.Electronic supplementary materialThe online version of this article (doi:10.1186/s12898-014-0029-1) contains supplementary material, which is available to authorized users.

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“…2), was collected from a fish pond in Northern Vietnam (Bui et al, 2016) and has been well maintained in the Laboratory of Environmental Toxicology, Institute for Environment and Resources, Vietnam National University -Hochiminh City, for more than 2 year. Daphnia lumholtzi was raised in COMBO medium (Kilham et al, 1998), at 27 ± 1 º C with a photoperiod of 12h light and 12h dark and under the light intensity of around 1000 Lux. The micro-crustacean was fed with a mixture of green alga (Chlorella sp.)…”

Section: Toxicity Testmentioning

confidence: 99%

“…Zinc at low concentrations should be an essential trace element for the living and growth of micro-crustacean (Kilham et al, 1998). However, the metals at high concentration could induce the impairment on the respiratory function of D. magna (Pane et al, 2003) and inhibit ISSN 2164-7682 2016 the sodium uptake leading to the osmotic imbalance in aquatic animals (Grosell et al, 2002) leading to the energy cost for maintain consequently fecundity reduction.…”

Section: Chronic Testmentioning

confidence: 99%

Toxicity of Zinc Dissolved In Saigon River to the Tropical Micro-Crustacean Daphnia Lumholtzi

Dao

Tran

et al. 2016

EMSD

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In this study we evaluated the responses of the tropical micro-crustacean, Daphnia lumholtzi, Environmental Management and Sustainable Development ISSN 2164-7682 2016 www.macrothink.org/emsd 171 to zinc (Zn). For a more environmentally realistic assessment on the Zn toxicity, water sample collected from Saigon River was used as medium for the daphnids and Zn was spiked into field water for exposures. River water was physically and chemically measured and analyzed, and the sufficient water quality was confirmed prior to be used for the acute and chronic experiments. Metal concentrations in the test water were determined with an inductively coupled plasma/ mass spectrometry (ICP/MS). In the acute test implementation, Zn concentrations were from 67 -360 µg/L. In the chronic experiments, the animals were incubated in control (filtered field water only) or filtered field water added with Zn (28, 46, and 75 µg/L) over the period of 14 days. The life history traits of daphnids including the survival, maturation, reproduction were daily observed. The results showed that the value of median lethal concentrations (48h-LC 50 ) was 136 µg Zn/L (95% CI = 107 -165 µg Zn/L). Chronic exposures revealed that Zn caused the survival reduction, delayed maturity age and reproduction decrease. Our study suggested D. lumholtzi as a very good freshwater aquatic zooplankton for assessment on the toxicity of metals in tropics. Besides, the Vietnam guideline values regarding Zn should be re-considered and adjusted for the aquatic ecological protection.

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Cited by 751 publications

References 21 publications

Hidden defensive morphology in rotifers: benefits, costs, and fitness consequences

Hidden defensive morphology in rotifers: benefits, costs, and fitness consequences

Phosphorus limitation enhances parasite impact: feedback effects at the population level

Toxicity of Zinc Dissolved In Saigon River to the Tropical Micro-Crustacean Daphnia Lumholtzi

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