Copepod Articles & Analysis
33 articles found
Xibalbanus cokei (Yager, 2013), a remipede, was discovered near Caye Chapel, Belize. A new genus of calanoid copepod was also discovered in Belize at Giant Cave, Caye Caulkner. Both species are endemic to a single cave. ...
In the present study, the acute toxicity of water‐soluble fractions (WSFs) from fresh and artificially weathered oil was followed over time in different life stages of the calanoid copepod Calanus finmarchicus, including adult males and females. The life stages differ in size but also in lipid content and physiology. ...
The bivalve Gaimardia trapesina and the copepod Harpacticus sp. were the most sensitive to copper, with 7 d LC50 values for both species ranging between 28 µg/L and 62 µg/L, while the copepod Tigriopus angulatus was the most tolerant of copper (7 d Cu LC50 1560 µg/L). ...
The most sensitive taxa were the snail Radix sp., the amphipod H. azteca, the water flea Daphnia magna, and copepods. Environmentally relevant concentrations had acute effects on D. magna and H. azteca (occurring 24 h after application), whereas lag times were more pronounced in Radix sp. snails and copepods, indicating chronic sublethal responses. ...
However, for the filter feeding calanoid copepods, Eurytemora affinis and Pseudodiaptomus forbesi, ingestion of pesticide‐bound particles could prove to be another route of exposure. ...
In order to compare responses to mechanically and chemically dispersed oil, the copepods were exposed to comparable dispersions of micron‐sized oil droplets made with and without the use of a chemical dispersant (similar oil droplet size range and oil concentrations) together with a constant supply of microalgae for a period of four days. ...
Microcrustaceans (e.g. daphnids, copepods) showed low potential vulnerability, particularly in lentic ecosystems. ...
For this reason, the epibenthic copepod, Tisbe battagliai, was selected for use in the investigations into acute and developmental effects of these compounds. ...
There are 1900 known freshwater species. B. Copepods: Meaning “oar feet”, are small crustaceans 1-2 mm in size with a tear drop shape and large antennae, most are “planktonic” (drift with water current), some other are “benthic” (live in muds). ...
Over the 42‐day experimental period, the time‐weighted average concentrations of azoxystrobin ranged from 93.5 to 99.3% of intended values. Zooplankton, especially copepods and Daphnia group longispina, were the most sensitive groups. ...
Nineteen species of zooplankton were observed, including 4 species of rotifers, 6 species of cladocerans and 9 species of copepods. Copepods were the dominant species, their abundance reaching 68%, whilst Cladocerans took second place with an abundance proportion of 28%. ...
Single‐species tests using abundant copepods Oncaea curvata, Oithona similis, and Stephos longipes allowed comparisons of sensitivity of key taxa and of sensitivity estimates obtained from traditional single‐species and more novel multi‐species tests. ...
Despite the observed negative effect of EE2 on roach and the positive indirect effect on zooplankton, these effects did not cascade to phytoplankton, possibly because only copepods, but not cladocerans—the major grazers in these systems—were released from fish predation. ...
Releases of the organophosphate insecticide chlorpyrifos and pyrethroid insecticides were examined to determine if they represented a threat to the copepods upon which delta smelt feed (Eurytemora affinis and Pseudodiaptomus forbesi) and aquatic life in general, represented by the standard testing organism, Hyalella azteca. ...
Thiram negatively affected rotifers and copepods suggesting more direct toxic effects. Our results show that the use of secondary production as an endpoint provide a more comprehensive assessment of potential direct and indirect effects of chemicals on community and support evidence of alteration on functional processes. ...
The acute toxicity of physically and chemically dispersed crude oil and the dispersant Corexit 9500 were evaluated for key Arctic species. The copepod Calanus glacialis, juvenile Arctic cod (Boreogadus saida), and larval sculpin (Myoxocephalus sp.) were tested under conditions representative of the Beaufort and Chukchi Seas during the ice‐free season. ...
In a four‐day single female reproduction test starting 13 days post exposure no significant differences in egg production rates or hatching success between reproducing control and exposed copepods were found. However, a significant lower portion of the surviving females from the highest exposure participated in egg production. The results indicate that although a short‐term ...
An atrazine concentration of 150 µg/L contributed to a 15% increase of the oscillation periods of both diatoms and copepods and a 52% reduction of oscillation amplitudes compared to the control situation. Although the amplitudes of copepods only increased 7% at 150 µg/L atrazine, the maximum and minimum copepod density at that concentration were ...
The influence of natural dissolved organic matter (DOM) on acute waterborne copper toxicity was evaluated in the euryhaline copepod Acartia tonsa at three different water salinities. Three sources of freshwater DOM (extracted by reverse osmosis) and two sources of marine DOM (extracted using a solid‐phase technique) were used. ...
Here we test whether feeding on ZnO‐exposed phytoplankton could cause toxic effects in a widespread and ecologically important marine grazer, the copepod Acartia tonsa. We exposed the diatom Thalassiosira weissflogii to ZnO NPs for 7 d and measured growth, zinc accumulation, and zinc distribution within the algal cells to elucidate bioavailability to grazing ...