Rotifers due to their relatively short lifespan, high fecundity and high rate of population growth are ideal for chronic toxicity tests. The aim of this research was to determine the lethal concentrations (LC50 24 h) of deltamethrin and imidaclopride and their impacts on the reproduction and growth of the freshwater rotifer, Brachionus calyciflorus. Experiments were carried out based on the gui...

Semi-terrestrial brachyuran sesarmid crabs are the most diverse and important faunal components of mangrove forest temperate coastal communities worldwide. To establish a stable larval rearing method for understanding their developmental processes including molecular mechanisms molting metamorphosis, we examined effects diet on survival growth three crabs, Chiromantes haematocheir, Orisarma int...

Twenty rotifers (three Bdelloidea and 17 Monogononta, including new of Encentrum and Notholca) , a platyhelminth, two nematodes, two tardigrades, one cnchytraeid worm, four c1adoccrans, two copcpods and three species of mites were recovered from five small pools on Heard Island. The results indicate that the Heard Island fauna is closer to that of Signy Island and Macquarie Island than to that ...

Abstract Although studies on snow algae and macroinvertebrates have been frequently conducted patches, only few surveys focused microinvertebrates which reach high biomass play various trophic roles in other cold habitats. The aims of this study were (1) to search for seasonal surface patches located the slope Mt. Gassan, northern Japan, (2) identify factors determining their distribution assoc...

The uptake of resources from the environment is a vital process for all organisms. Many experimental studies have revealed that the rate at which this process occurs depends critically on the resource concentration, a relationship called ‘‘functional response.’’ However, whether the concentration of the consumer normally affects the functional response has been the subject of a long-standing, p...

A method was developed to allow direct measurements of predation exerted by metazooplankton on ciliates. The method relied on the use of ciliates labelled with fluorescent microparticles (FMP). Optimal labelling conditions were determined with ciliates from cultures (Tetrahymena pyriformis) and with natural ciliate assemblages sampled in a river. Labelled T. pyriformis were used as tracer food ...

In order to address the dearth of information on Rotifera in Vietnam, and especially on rotifers inhabiting freshwater psammon in Southeast Asia, we collected and examined twenty-five hygropsammon samples from Bau Thiem Lake, Thua Thien Hue Province, central Vietnam. A total of eighty-nine species-level rotifer taxa were identified, belonging to 21 genera and 13 families. Of these, 48 taxa (54%...