Results 161 to 170 of about 13,377 (210)
Some of the next articles are maybe not open access.
Toxicity of fluoroquinolones on the cladoceran Daphnia magna
Water Environment Research, 2021AbstractThis study evaluates the acute and chronic toxicological effects of six fluoroquinolones on the mortality and growth of Daphnia magna. The NOECs calculated with the multivariate Probit regression model for the chronic study were 56 μg/L ciprofloxacin, 63 μg/L enrofloxacin, 78 μg/L levofloxacin, 85 μg/L marbofloxacin, 69 μg/L norfloxacin, and ...
Dafna Eluk +4 more
openaire +3 more sources
2014
Cladocerans are valuable indicators of environmental change in lakes. Their fossils provide information on past changes in lake environments. However, few studies have quantitatively examined the relationships between contemporary and sub-fossil cladoceran assemblages and no investigations are available from Mediterranean lakes where salinity ...
Çakıroğlu, Idil +8 more
openaire +1 more source
Cladocerans are valuable indicators of environmental change in lakes. Their fossils provide information on past changes in lake environments. However, few studies have quantitatively examined the relationships between contemporary and sub-fossil cladoceran assemblages and no investigations are available from Mediterranean lakes where salinity ...
Çakıroğlu, Idil +8 more
openaire +1 more source
Reproductive Biology of Marine Cladocerans
1997Publisher Summary The chapter discusses the reproductive biology of marine cladocerans. Marine cladocerans are seasonally abundant and widely distributed in continental shelf waters, estuaries, the open ocean, the Baltic, the Mediterranean, and inland seas.
David A. Egloff +2 more
openaire +1 more source
STATISTICAL ANALYSIS OF THE CLADOCERAN REPRODUCTIVITY TEST
Environmental Toxicology and Chemistry, 1986AbstractThe data from a renewal toxicity test are awkward to interpret if some of the adult organisms die during the experiment. The usual summary statistic is the mean number of young produced per adult, but when some adults die, the mean can be defined in two different ways, the mean overall (MOA) and the mean ignoring mortality (MIM).
openaire +1 more source
Estimating food limitation in cladoceran populations1
Limnology and Oceanography, 1982Cladocerans store energy for reproduction and survival in the form of triglyceride droplets. The amount of storage in adults is lowest just after egg production and increases during the intermolt period. The bright orange‐yellow of the lipid droplets allows rapid visual indexing of an individual’s body reserves.
Alan J. Tessier, Clyde E. Goulden
openaire +1 more source
Cladoceran assemblages in a mineralization gradient
Hydrobiologia, 2001Cladoceran assemblages were studied in littoral samples from 44 water bodies in Central Spain, showing great differences in salinity and permanence of water. Principal component analyses (PCA) were performed with data on cladoceran relative abundances to identify the main groups of species. Five main groups of species were found, defining the following
Loles Boronat +2 more
openaire +1 more source
A SEVEN-DAY LIFE CYCLE CLADOCERAN TOXICITY TEST
Environmental Toxicology and Chemistry, 1984Abstract A three-brood life cycle test for Ceriodaphnia reticulata, using renewal techniques, that can be completed in 7 d is described. The test is convenient when samples to be tested are limited in volume or when time is especially important, such as in on-site effluent testing. The cladoceran C.
D. I. Mount, T. J. Norberg
openaire +1 more source
Cladoceran Diversity, Distribution and Ecological Significance
2016Cladocerans invariably constitute a dominant component of limnological and zooplankton systems. Cladocerans have a key role in aquatic food chain and contribute to secondary production in aquatic ecosystems. Substantially cladocerans represent a very old group of Palaeozoic origin and currently 620 species are reported globally.
M. Karuthapandi, D. V. Rao
openaire +1 more source
CARDIAC PHARMACOLOGY OF THE CLADOCERAN, DAPHNIA
The Biological Bulletin, 19421. Acetylcholine was found to have a depressing effect on the heart rate and strength of beat of the heart of Daphnia magna with the threshold at 10-9 and a depression of 25 per cent at 10-5 The effect is reversible.2. Atropine has a depressing effect on the heart rate with the threshold at 10-7 and an inhibition of 15 per cent at 10-4 The effect is ...
openaire +1 more source
Balancing Predation and Competition in Cladocerans
Ecology, 1974A graphic model is proposed relating the balance between predation and competition to size strategies and species richness in zooplankton communities. As decreasing survivorship, due to predation, and increasing food—collecting ability are arranged along the single dimension of body size, both may be specified clearly.
openaire +1 more source