Nutrient content of plants is low relative to that of herbivores. Dietary nutrients can limit the growth and reproduction of herbivores. We studied life history consequences and starvation resistance for a common planktonic rotifer, Keratella cochlearis, feeding on algae grown on nutrient-limited media. A strain of Cryptomonas was grown on three types of growth medium with nitrogen (N) and phos...

It is widely accepted that distributions of plants and animals are broadly constrained by their physiological tolerances to climatic factors (Woodward, 1987, 1990). This generalization is held to be true for species at a variety of spatial scales (Whittaker et al., 2001), although there is a wide recognition that the importance of climate is best expressed at large spatial scales (Rahbek & Grav...

Many trait-based plant investigations have neglected the intraspecific trait variations. A lot of ecologists consider that this is unreasonable, because intraspecific variation significantly affects various ecological dynamics. However, it is not feasible to record the traits of each plant individually at every community site. Therefore, the aim of this study was to determine in which circumsta...

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...

Kashmir traditionally known as heaven on earth for its beauty is gifted with water resources comprising rivers, lakes, streams and springs. Lakes provide a multitude of uses are prime regions human settlement habitat. One such body Khushalsar Lake located in the downtown area Srinagar city. It noticed that at present has fallen victim to extensive encroachment, garbage dumping release untreated...

BACKGROUND In spite of considerable efforts over past decades we still know relatively little regarding the biogeography of rotifers of inland waters in México. To help rectify this we undertook an extensive survey of the rotifer fauna of 48 water bodies in the Chihuahuan Desert of México. RESULTS Of the sites surveyed, 21 had salinities >or= 2000 microS cm-1 and in these we found 57 species ...

Juvenile hormone (JH) and serotonin (5-HT) were previously shown to enhance mictic (sexual) female production of the rotifer Brachionus plicatilis in batch cultures. To explore the basis of these effects, experiments were conducted on isolated individuals. JH treatment of maternal rotifers with 5 and 50 µgml(-1) (18.8 and 187.7 µM) resulted in significantly higher (P<0.05) mictic female product...