Cyclomorphosis in Daphnia magna and Ceriodaphnia reticulata (Cladocera) from northern Tunisian groundwater: influence of temperature and invertebrates?

Crustaceana ◽  
2015 ◽  
Vol 88 (10-11) ◽  
pp. 1139-1148
Author(s):  
H. Toumi ◽  
M. Bejaoui ◽  
M. Boumaiza
Keyword(s):  
Water Temperature ◽  
Daphnia Magna ◽  
Seasonal Distribution ◽  
Spine Length ◽  
Influence Of Temperature ◽  
Ceriodaphnia Reticulata ◽  
Groundwater Wells

In the present study, we investigated cyclomorphosis in two cladocerans, Daphnia magna and Ceriodaphnia reticulata, sampled from northern Tunisian groundwater (wells) during two seasons (spring and summer). Seasonal distribution of the two species was apparent, with dominance of D. magna only in spring and C. reticulata during the whole study period. Our results showed correlations between caudal spine length of D. magna and water temperature (, ), and between caudal spine length and the density of coleopteran larvae (Stictonectes escheri, Graptodytes sp., Gyrinus urinator, and Haliplus lineaticollis) (, ). In C. reticulata, we registered a correlation (, ) only between its size and the density of larvae of Ephemeroptera (Cloeon cognatum) but no correlation with water temperature was found.

Zooplankton dynamics during autumn circulation in a small, wind-sheltered, Mediterranean lake

2006 ◽  
Vol 57 (4) ◽  
pp. 441 ◽  
Author(s):  
M. Alvarez-Cobelas ◽  
A. Baltanás ◽  
J. L. Velasco ◽  
C. Rojo
Keyword(s):  
Water Temperature ◽  
Current Model ◽  
Fish Predation ◽  
Controlling Factors ◽  
Heterotrophic Nanoflagellates ◽  
Delayed Effects ◽  
Zooplankton Dynamics ◽  
Mediterranean Lake ◽  
Fish Abundances ◽  
Ceriodaphnia Reticulata

Few studies have been undertaken on zooplankton dynamics during the transition from late stratification to early mixing in lakes. The Plankton Ecology Group (PEG) model of plankton seasonality only considers water temperature, edible phytoplankton and fish predation as zooplankton-controlling factors during that period. The water-column edible algal and bacterial fractions, heterotrophic nanoflagellates, ciliates, rotifers, cladocerans and copepods were studied during 93 consecutive days of mixing-transition in a wind-sheltered, Mediterranean lake without planktivorous fish. Abundances of all zooplankton populations except ciliates, Daphnia longispina and copepodites, were related to water temperature. In addition to PEG controlling factors, time series analysis indicated competition between ciliates and Ceriodaphnia reticulata and Polyarthra dolichoptera and D. longispina, predation of Arctodiaptomus salinus on ciliates, herbivory of adult copepods on the 5–20 μm phytoplanktonic size and delayed effects shorter than one week. The remaining zooplankton populations did not show any edible size preference. Ceriodaphnia reticulata showed evidence of herbivory on bacteria and picoplankton and competition with Hexarthra fennica in shorter periods. Phyto- and zooplankton production were decoupled. These results, and others from warmer periods and latitudes, suggest that the current model of lake plankton seasonality must be reviewed.

Seasonal distribution of bdellovibrios at the mouth of the Patuxent River in the Chesapeake Bay

1982 ◽  
Vol 28 (1) ◽  
pp. 111-116 ◽  
Author(s):  
Henry N. Williams ◽  
William A. Falkler Jr. ◽  
Donald E. Shay
Keyword(s):  
Seasonal Variation ◽  
Water Sample ◽  
Water Temperature ◽  
Chesapeake Bay ◽  
Water Samples ◽  
Vibrio Parahaemolyticus ◽  
Seasonal Distribution ◽  
Bacterial Counts ◽  
Patuxent River

Water samples taken at monthly intervals from three sites in the mouth of the Patuxent River in the Chesapeake Bay were cultured for bdellovibrios lytic to Vibrio parahaemolyticus and for total viable bacterial counts. The number of bdellovibrios recovered decreased from the spring months (April, May, June (AMJ)) until very few were detected during the winter months (January, February, March (JFM)), which also coincided with the lowest water temperatures. During the AMJ season there was a significant increase as compared with the JFM season in the number of bdellovibrios for all sites. The highest number of bdellovibrios was recovered during each season from the shoreline water sample, with one exception. The seasonal variation in the number of bdellovibrios was observed to correlate statistically with the water temperature.

scholarly journals Historia de vida de Daphnia Magna y Ceriodaphnia Reticulata en condiciones de laboratorio: uso potencial como alimento para peces

2013 ◽  
Vol 5 (2) ◽  
pp. 340 ◽  
Author(s):  
MARIO GÁNDARA ◽  
ROSSEVAL LEITE ◽  
PEDRO CARABALLO
Keyword(s):  
Daphnia Magna ◽  
Colossoma Macropomum ◽  
San Marcos ◽  
Historia De Vida ◽  
Ceriodaphnia Reticulata

  Los cladóceros por su pequeña talla, rápido desarrollo y temprana reproducción, son utilizados como alimento vivo en piscicultura. Este trabajo tuvo como objetivo estudiar la historia de vida de Daphnia magna y Ceriodaphnia reticulata (Crustacea - Cladocera), bajo condiciones de laboratorio para definir su potencial como alimento en piscicultura. Fueron realizados cultivos experimentales de D. magna y C. reticulata manteniendo 12 individuos por especie en recipientes independientes de 100 ml. Como alimento se utilizó seston proveniente de la ciénaga de San Marcos – Sucre, filtrado con malla de 40 μm y mantenido en dos acuarios de 25 litros. Los parámetros poblacionales fueron medidos cada 12 horas a lo largo del periodo de vida de los especímenes. El tiempo del desarrollo embrionario fue de 16 horas para C. reticulata y 24 horas para D. magna. Se obtuvieron diferencias significativas (P≥0.05) en el crecimiento poblacional, siendo mejor el desempeño de C. reticulata (fecundidad media de 1.12 neonatos/hembra, edad y talla de la maduración de 5.9 días y 77.9 μm, respectivamente) que el de D. magna (fecundidad media de 0.71 neonatos/hembra, edad y talla de la maduración de 9 días y 256 μm, respectivamente). Los cladóceros estudiados mostraron diferencias en los parámetros poblacionales, lo que sugiere estrategias de adaptación diferentes con relación al recurso alimenticio ofrecido. En general se encontró que por su tamaño y rápido crecimiento son potencialmente útiles como alimento al inicio de la alimentación exógena de postlarvas de Prochilodus magdalenae, Brycon sinuensis y Colossoma macropomum, principales especies piscícolas en la región.

scholarly journals Daphnia magna fitness during low food supply under different water temperature and brownification scenarios

2016 ◽  
Author(s):  
Andrea Gall ◽  
Martin J. Kainz ◽  
Serena Rasconi
Keyword(s):  
Water Temperature ◽  
Daphnia Magna ◽  
Current Knowledge ◽  
Physiological Activity ◽  
Somatic Growth ◽  
Low Carbon ◽  
Carbon Supply ◽  
Food Quantity ◽  
Higher Temperature ◽  
Outdoor Mesocosms

<p class="BodyA">Much of our current knowledge about non-limiting dietary carbon supply for herbivorous zooplankton is based on experimental evidence and typically conducted at ~1 mg C L<sup>-1</sup> and ~20°C. Here we ask how low supply of dietary carbon affects somatic growth, reproduction, and survival of <em>Daphnia magna</em> and test effects of higher water temperature (+3 °C relative to ambient) and brownification (3X higher than natural water color; both predicted effects of climate change) during fall cooling. We predicted that even at very low carbon supply (~5µg C L<sup>-1</sup>), higher water temperature and brownification will allow <em>D. magna</em> to increase its fitness. Neonates (&lt;24 h old) were incubated with lake seston for 4 weeks (October-November 2013) in experimental bottles submerged in outdoor mesocosms to explore effects of warmer and darker water. Higher temperature and brownification did not significantly affect food quality, as assessed by its fatty acid composition. <em>Daphnia</em> exposed to both increased temperature and brownification had highest somatic growth and were the only that reproduced, and higher temperature caused the highest <em>Daphnia</em> survival success. These results suggest that even under low temperature and thus lower physiological activity, low food quantity is more important than its quality for <em>D. magna</em> fitness.</p>

scholarly journals Influence of temperature on microsporidia infections in a natural population of Simulium pertinax Kollar, 1832 (Diptera; Simuliidae)

2007 ◽  
Vol 67 (3) ◽  
pp. 519-526 ◽  
Author(s):  
ES. Nascimento ◽  
R. Figueiró ◽  
JJ. Becnel ◽  
CJPC. Araújo-Coutinho
Keyword(s):  
Water Temperature ◽  
Breeding Site ◽  
Sampling Period ◽  
Environmental Water ◽  
Infection Prevalence ◽  
Infection Rates ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Blackfly Larvae ◽  
Second Period

During the studies involving the correlation between the water temperature of the breeding site of Simulium pertinax larvae and the infection prevalence by microsporidia, developed in the Andorinhas river, Magé, RJ, weekly samples of blackfly larvae were taken within a two-year period (2001-2002 and 2003-2004), and it was noticed that the infections by Amblyospora sp. were more prevalent when compared to infections by Polydispyrenia sp. in larvae. It was also observed that the infections do not follow the same pattern, since the genus Amblyospora was recorded almost every month during the study with the exception of December, 2001. In the results of correlation between the environmental water temperature and the microsporidia infection rates, it was observed that for the first period studied, there was a high negative correlation, while during the second period there was absence correlation. On the other hand, the Amblyospora sp. infection rates prove that the correlation was high and significant in the first period, but was not significant in the second sampling period and Polydispyrenia sp. showed absence correlation in both periods.

The occurrence, life cycle, and pathogenicity of Echinuria uncinata (Rudolphi, 1819) Soloviev, 1912 (Spirurida, Nematoda) in waterfowl at Delta, Manitoba

1972 ◽  
Vol 50 (4) ◽  
pp. 385-393 ◽  
Author(s):  
F. G. Austin ◽  
H. E. Welch
Keyword(s):  
Life Cycle ◽  
Daphnia Magna ◽  
Infective Stage ◽  
Gammarus Lacustris ◽  
Lesser Scaup ◽  
Common Eiders ◽  
Third Stage ◽  
Mucosal Layer ◽  
Ceriodaphnia Reticulata ◽  
Sexually Mature

In the Delta Marsh, third-stage Echinuria uncinata juveniles were found in Daphnia magna, D. pulex, Simocephalus vetulus, and Gammarus lacustris. Daphnia magna, the major host, were found infected from late May to early November with a peak of 108 parasites per 100 Daphnia in early August. Experimentally, D. magna, D. pulex, Ceriodaphnia reticulata, C. acanthina, S. vetulus, Moina macrocopa, Eurycercus lamellatus, G. lacustris, Hyallela azteca, Chirocephalopsis bundyi, and Lynceus brachyurus became infected when exposed to E. uncinata eggs. Parasites developed to the infective stage in D. magna and D. pulex in 30 days at 15 °C and in 10 days at 20–24 °C.In mallard ducks, E. uncinata completed the fourth molt 20 days after infection; male worms were sexually mature after 30 days and females oviposited 40 days after infection. Parasites grew faster in 1-week-old Delta mallards than in 2- and 3-month-old birds. Adult nematodes were located beneath the mucosal layer at the junction of the proventriculus and gizzard where granulomas formed after 30 days. The number of granulomas was correlated with the number of parasites. Mallards, pintails, gadwalls, lesser scaup, common eiders, and domestic geese were more susceptible to Echinuria infection than were shovellers, blue-winged teal, redheads, ruddy ducks, and American coots. Parasite eggs died when frozen but 50% survived 85 days when dried on filter paper. Echinuria uncinata can survive winter in resident mallards.

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