Results 131 to 140 of about 9,122 (188)

Relatedness between contemporary cladoceran and surface sediment subfossil cladoceran assemblages in Turkish lakes

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, Tavşanoğlu, N, Levi, Eti, Davidson, Thomas Alexander; id_orcid 0000-0003-2326-1564, Bucak, Tuba, Özen, Arda, Akyıldız, G, Jeppesen, Erik, Beklioğlu, Meryem   +8 more
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Turbidity mitigates lead toxicity to cladocerans (Cladocera)

Ecotoxicology, 2006
To test the hypothesis that sediment would have a synergistic effect on the toxicity of lead to cladocerans, we performed life table demography experiments with two pelagic (Diaphanosoma birgei and Moina micrura) and one littoral (Alona rectangula) cladoceran species.
Gerardo, García-García, S, Nandini, S S S, Sarma   +2 more
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Egg‐Size Cycle of a Cladoceran

Ecology, 1974
The cladoceran Bosmina Longirostris undergoes a peculiar egg—size cycle in Frains Lake. Females carry small eggs during summer, then switch to large eggs in late fall, in the process more than doubling the enclosed yolk volume. Winter generations mature at larger sizes, then shift to small eggs in early spring.
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Variation in, and Causes of, Toxicity of Cigarette Butts to a Cladoceran and Microtox

Archives of Environmental Contamination and Toxicology, 2005
Cigarette butts are the most numerically frequent form of litter in the world. In Australia alone, 24-32 billion cigarette butts are littered annually. Despite this littering, few studies have been undertaken to explore the toxicity of cigarette butts in aquatic ecosystems. The acute toxicity of 19 filtered cigarette types to Ceriodaphnia cf. dubia (48-
Micevska, T., Warne, M. St J., Pablo, F., Patra, R.   +3 more
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Reproductive Biology of Marine Cladocerans

1997
Publisher 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, Paul W. Fofonoff, Takashi Onbé   +2 more
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Distribution of marine cladocerans in the Indian Ocean

Marine Biology, 1972
Cladocera of the Indian Ocean have been studied, on the basis of samples collected during the International Indian Ocean Expedition (IIOE). Out of a total of 1927 samples, 552 contained Cladocera. Although the distribution of this group is mainly coastal, one species, Evadne tergestina, has been found in oceanic waters also, where it may establish ...
N. Della Croce, P. Venugopal
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Miniature genomes and endopolyploidy in cladoceran crustaceans

Genome, 1989
The haploid genome sizes (0.37 and 0.47 pg) of two members of the cladoceran crustacean genus Daphnia rank among the smallest known for Crustacea. An examination of cladoceran somatic tissues by scanning microdensitometry revealed abundant endopolyploidy in both species.
Margaret J. Beaton, Paul D. N. Hebert
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Balancing Predation and Competition in Cladocerans

Ecology, 1974
A 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.
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CARDIAC PHARMACOLOGY OF THE CLADOCERAN, DAPHNIA

The Biological Bulletin, 1942
1. 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 ...
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Foraging Responses of Littoral Cladocerans

1979
Cette thèse consiste en deux manuscrits qui examinent les réponses de broutage de Sida crystallina, Chydorus sphaericus et Alona affinis en fonction des variations naturelles dans leurs ressources alimentaires (en suspension et périphytique). Le premier manuscrit introduit une méthode de mesure in situ des taux d'élimination des particules en ...
openaire   +1 more source