scholarly journals Assessment of predatory ability of native and non-native freshwater gammaridean species: A rapid test with water fleas as prey

2011 ◽  
Vol 57 (6) ◽  
pp. 836-843 ◽  
Author(s):  
B.E.M.W. Stoffels ◽  
J.S. Tummers ◽  
G. Van Der Velde ◽  
D. Platvoet ◽  
H.W.M. Hendriks ◽  
...  
Keyword(s):  
Daphnia Magna ◽  
Consumption Rate ◽  
Rapid Test ◽  
Predation Rate ◽  
Water Flea ◽  
Gammarus Fossarum ◽  
Temperature Regimes ◽  
Different Temperatures ◽  
Invasion Impacts ◽  
Daphnia Test

Abstract Predation rate with relation to species, sex and water temperature was tested among four different gammaridean species: Dikerogammarus villosus, Gammarus roeselii, Gammarus pulex and Gammarus fossarum. Tests were performed in microcosms in climate-controlled rooms at five different temperatures. Daphnia magna, a common water flea, served as prey. On average D. villosus showed the highest consumption rate of Daphnia magna over the entire temperature range, followed in decreasing order by G. p u le x , G. roeselii and G. fossarum. The predation rate of all species showed a distinct peak at 20°C. Correction of predation rates for body size gave somewhat different results. D. villosus is then still the most predatory of all gammaridean species tested followed by G. pulex, G. fossarum and G. roeselii. The outcome of the Daphnia tests is consistent with results of other studies with different prey. This supports that the Daphnia test is a good and quick indicator of the predatory abilities in gammaridean species at varying temperatures, and allows the prediction of how changing temperature regimes influence invasion impacts.

Prediction of acute toxicity of emerging contaminants on the water flea Daphnia magna by Ant Colony Optimization–Support Vector Machine QSTR models

2017 ◽  
Vol 19 (3) ◽  
pp. 438-448 ◽  
Author(s):  
Reza Aalizadeh ◽  
Peter C. von der Ohe ◽  
Nikolaos S. Thomaidis
Keyword(s):  
Support Vector Machine ◽  
Acute Toxicity ◽  
Ant Colony Optimization ◽  
Daphnia Magna ◽  
Emerging Contaminants ◽  
Ant Colony ◽  
Support Vector ◽  
Water Flea

Prediction of acute toxicity towardsDaphnia magnausing Ant Colony Optimization–Support Vector Machine QSTR models.

Comparative Evaluation of Effects of .GAMMA.-Rays and Heavy Metals on Mobility of the Water Flea Daphnia magna

RADIOISOTOPES ◽  
2003 ◽  
Vol 52 (7) ◽  
pp. 319-326 ◽  
Author(s):  
Shoichi FUMA ◽  
Nobuyoshi ISHII ◽  
Nobuyuki TANAKA ◽  
Hiroshi TAKEDA ◽  
Kiriko MIYAMOTO ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Daphnia Magna ◽  
Gamma Rays ◽  
Comparative Evaluation ◽  
Water Flea

The screening of chemicals for juvenoid-related endocrine activity using the water flea Daphnia magna

2005 ◽  
Vol 74 (3) ◽  
pp. 193-204 ◽  
Author(s):  
Helen Ying Wang ◽  
Allen W. Olmstead ◽  
Hong Li ◽  
Gerald A. LeBlanc
Keyword(s):  
Daphnia Magna ◽  
Water Flea ◽  
Endocrine Activity

Effect of the lipid regulator Gemfibrozil in the Cladocera Daphnia magna at different temperatures

2016 ◽  
Vol 52 (3) ◽  
pp. 228-234 ◽  
Author(s):  
Beatriz Salesa ◽  
María D. Ferrando ◽  
María J. Villarroel ◽  
Encarna Sancho
Keyword(s):  
Daphnia Magna ◽  
Different Temperatures

Temperature-dependent development and life table parameters of Schizotetranychus smirnovi (Acari: Tetranychidae) on Almond

2020 ◽  
Vol 25 (8) ◽  
pp. 1373-1383
Author(s):  
Zarir Saeidi ◽  
Alireza Nemati ◽  
Elham Riahi
Keyword(s):  
Life Table ◽  
Intrinsic Rate ◽  
Mite Species ◽  
Reproductive Rate ◽  
Intrinsic Rate Of Increase ◽  
Adult Longevity ◽  
Offspring Production ◽  
Temperature Regimes ◽  
Rate Of Increase ◽  
Different Temperatures

In the current study, development, reproduction, and longevity of Schizotetranychus smirnovi Wainstein concerning seven different temperatures including 13±1, 15±1, 20± 1, 25±1, 27±1, 30 ±1 and 35 ±1°C, relative humidity 50 ± 10 % and a photoperiod of 14:10 (L:D) h. were investigated. Due to mite inability to settle on leaf disk, almond young branches were used for conducting life table experiments. Our results indicated that higher and lower temperatures caused a steeper decline in survivorship. The highest survival rate was observed at 25 and 27°C. The mean total development time was significantly decreased with increasing the temperatures; while adult longevity for both female and males significantly decreased. Furthermore, offspring production did not occur at 35°C. The highest values of the intrinsic rate of increase (r) and finite rate of increase (λ) were 0.2563 and 1.2922 d-1 at 27°C, while their lowest values were obtained at 13°C. Again high temperature (30°C) caused a decline in both the reproductive rate and growth rate of this mite species. The longest mean generation time (T) (58.55 d) was at 13 °C and it declined significantly with increasing temperature. The most striking result emerging from our data is that 27°C is the most desirable temperature for not only development but also the reproduction of S. smirnovi. Finally, our obtained information provides a better understanding of the life history of S. smirnovi and its ability to survive and reproduce under different temperature regimes which can be used in the management of this pest.

scholarly journals Performance of Three Isolates of Metarhizium Anisopliae and Their Virulence against Zeugodacus Cucurbitae under Different Temperature Regimes, with Global Extrapolation of Their Efficiency

Insects ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 270 ◽  
Author(s):  
Susan K. Onsongo ◽  
Bernard M. Gichimu ◽  
Komivi S. Akutse ◽  
Thomas Dubois ◽  
Samira A. Mohamed
Keyword(s):  
Metarhizium Anisopliae ◽  
Abiotic Factors ◽  
Quadratic Model ◽  
Percentage Mortality ◽  
Melon Fly ◽  
Temperature Regimes ◽  
Global Mapping ◽  
Different Temperatures ◽  
Data Layer ◽  
The Tropics

The performance of entomopathogenic fungi in pest control is usually affected by both biotic and abiotic factors. This study aimed to determine the effects of various temperatures (15, 20, 25 and 30 °C) on conidial germination, mycelial growth and conidial density and virulence to the melon fly Zeugodacus cucurbitae of three selected isolates of Metarhizium anisopliae. The three isolates, ICIPE 18, ICIPE 30 and ICIPE 69, had previously been selected in laboratory bioassays. Percentage mortality by the three isolates ranged between 16.25% and 100.0% across the different temperatures. The isolates ICIPE 69 and ICIPE 18 recorded the highest percentage mortality of 96.25% and 100% and the shortest LT50 values of 2.61 and 2.63 days, respectively, at 30 °C. However, at 30 °C, ICIPE 69 produced the highest number of conidia of 90.5 × 107 /mL and was therefore selected for global mapping to predict its efficacy against Z. cucurbitae using the geospatial temperature data layer and the best fitted quadratic model. The map showed that the isolate would be more effective in the tropics than in temperate climates.

scholarly journals MicroRNAs in Daphnia magna identified and characterized by deep sequencing, genome mapping and manual curation

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Dag H. Coucheron ◽  
Marcin W. Wojewodzic ◽  
Thomas Bøhn
Keyword(s):  
Daphnia Magna ◽  
Deep Sequencing ◽  
Rna Silencing ◽  
Genome Mapping ◽  
Regulation Of Gene Expression ◽  
Environmental Cues ◽  
Water Flea ◽  
Manual Curation ◽  
Non Coding Rnas ◽  
Post Transcriptional Regulation

Abstract MicroRNAs (miRNAs) are small non-coding RNAs that function in RNA silencing and post-transcriptional regulation of gene expression in most organisms. The water flea, Daphnia magna is a key model to study phenotypic, physiological and genomic responses to environmental cues and miRNAs can potentially mediate these responses. By using deep sequencing, genome mapping and manual curations, we have characterised the miRNAome of D. magna. We identified 66 conserved miRNAs and 13 novel miRNAs; all of these were found in the three studied life stages of D. magna (juveniles, subadults, adults), but with variation in expression levels between stages. Forty-one of the miRNAs were clustered into 13 genome clusters also present in the D. pulex genome. Most miRNAs contained sequence variants (isomiRs). The highest expressed isomiRs were 3′ template variants with one nucleotide deletion or 3′ non-template variants with addition of A or U at the 3′ end. We also identified offset RNAs (moRs) and loop RNAs (loRs). Our work extends the base for further work on all species (miRNA, isomiRs, moRNAs, loRNAs) of the miRNAome of Daphnia as biomarkers in response to chemical substances and environment cues, and underline age dependency.

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