Annales de Limnologie - International Journal of Limnology

We test the effects of leaf quality and incubation duration on E. berilloni. Resource quality was positively related to consumption. Body mass condition changed with diet. Consumption, mass body condition and RNA:BM significantly interacted with incubation duration. Special care should be taken when comparing experiments with different duration.

The concept of phytoplankton functional groups was well applicable in our study of Lake Fuxian and it was suggested that predominant assemblages succession were acting as T (October) to H1 (January) to H1 (April) to Lo (July). Furthermore, according to RDA analysis, it was indicated that WT and TN/TP might be key driving factors in the phytoplankton changes of Lake Fuxian.

Daphnia sp. feeding rate was affected by low NaCl concentrations and seston quality seems to be more important in their feeding rate performance than changes in water parameters. The here-obtained results showed that feeding inhibition tests has a sensible cost-effective methodology to assess the effects of abiotic stresses in freshwater ecosystems.

This study presents the first comprehensive investigation of water beetles in oligotrophic hydrosystems with tufa formation in southeastern Europe. Biological and ecological traits of so far poorly studied species are revealed.The results provide a basis for future investigations, and demonstrate the potential of Elmidae as water quality indicators in this region.

We intended to choose an indicator group to better represent the biodiversity in man-made tropical ponds. For these propose we tested the congruence pattern among several aquatic communities. Two explanations have been previously proposed for the congruence among different taxa: (i) that different taxa have the same responses to environmental gradients (Padial et al., 2012a); or (ii) that congruence occurs because of ecological interactions among different groups, for instance, the relationships between predators and prey (Larsen et al., 2012). We hypothesized that the communities that depend directly on both water and land are likely more congruent with each other (e.g., amphibians, Odonata (in part), and macrophytes) than those that live in only one of these habitats (e.g., phytoplankton, aquatic insects, and birds). Although the congruency found for them was weak, amphibians were able to partially represent patterns in the abundance of Coleoptera, Heteroptera, and macrophytes. In terms of richness, macrophytes were able to partially represent patterns in Odonata, Coleoptera and birds. In this way, at least for abundance, our results partially supported the hypothesis that the biotic communities that depend directly on both water and land (e.g., amphibians and macrophytes) are more congruent with each other than those living only in one of these environments.Ultimately, we do not recommend the use of a single surrogate taxon to measure biodiversity: weak overall congruence between taxa; limited biological knowledge about tropical artificial ponds; and numerous taxa whose diversity patterns could not be represented by any surrogate group (phytoplankton, Heteroptera, and birds) illustrate the unsuitability of this approach.

Benthic, vegetation and hyporheic invertebrates sampled in springs along an elevation gradient in the Chartreuse mountains decreased in taxonomic richness with elevation, while landscape and local characteristics had poor influence on their diversity but partly controlled their abundances.

This first radiotelemetric study comparing summer movement patterns of juvenile and adult noble crayfish (Astacusastacus) found substantial differences between the two groups during the 24-h cycle. In addition, juveniles moved over significantly longer distances, predominantly upstream.

Plastic carrier bags claimed as home compostable lost less than 5% of their initial mass after 11 weeks spent in a stream orits riparian area. Decomposers inhabiting natural environments proved inefficient in degrading such single-use plastic products made of biopolymers.

The concept of functional feeding groups was used to classify and reveal the seasonal variation of phytoplankton functional groups in relation to environmental parameters. Phytoplankton species were grouped into 17 functional groups that vary significant spatially and seasonally. The pattern of phytoplankton functional groups seasonal successions decided by the five predominant functional groups. Total nitrogen, ammonium nitrogen, nitrate nitrogen, N:P ratio, water depth and transparency were the major factor influencing phytoplankton community in this basin.

NO₂⁻–N and TN in Spring, SD and TP in Summer had significant difference between 8 lakes and 5 reservoirs located in the Yangtze River delta (P < 0.05). All 13 studied water bodies were dominated by cyanophyta, whose Microcystis may determine the dominance of Bosmina fatalis. Eutrophic level should be in relation to the significant difference of plankton between 8 lakes and 5 reservoirs (P < 0.05). Five factors (cyanophyta, SD, WT, pH and DO) were significantly correlated with crustacean zooplankton abundance (P < 0.05). This research provided basic data of the 13 water bodies and studied the relationship between zooplankton and physicochemical factors as well as phytoplankton, providing scientific basis for the monitoring of eutrophic waterbodies located in the Yangtze river delta.

According to indoor simulation experiments, we found that the morphology changes and growth of C. vulgaris affected by C. demersum methanol extracts were dependent of initial algal density (IAD) and the macrophyte biomass. However, the individual or combined effects of those active compounds played roles in the interaction require further investigation.

Interspecific allelopathic effects of B. calyciflorus and M. macrocopa were dependent on the origin and concentration of allelochemical, life history variable, temperature and food density. M. macrocopa had higher sensitivity to the allelochemicals from B. calyciflorus. The underlying mechanisms should be further investigated.

Our results showed theimportant diversity of Maghreb despite the scarcity of fresh waters and the weak knowledge on this area. We highlighted a very high rate of endemism with 52% of species occurring at on only 1 or 2 sites. We found enough data to discuss some hypotheses about the factors underlying this endemism and the biogeographical origin of species.

Except for the highest mixing intensity group (1.28 m s⁻¹), the colony sizes and growth rate of M. aeruginosa in mixing intensity groups (0.16, 0.32, 0.64 m s⁻¹) was significantly higher than those in controls. This study suggested that modest mixing can significantly influence colony size and the growth of M. aeruginosa in freshwater ecosystem.

Ecological characterizations of the sampling stations were introducedby TIT–Trophic Index Turkey, TI–Trophic Index, and EPI-D–Eutrophication and/or Pollution Index-Diatom. Trophic index Turkey tested in this study provides information about assessment of surface watersin the south-east of the Gaziantep catchment (Turkey). Comparedto EPI-D, TIT was more competitive and had significantpositive correlation with P-PO₄. Trophic Index Turkey could be a useful biological metricfor freshwater monitoring.

The impact of endocrine disrupting compounds (ECDs) on aquatic biota it is complex. In rotifersLH induces the production of males, whereas FSH does not; the abnormal cohort of rotifers descended from LH does not reproduce while that of FSH does, LH does produces cysts while FSH does not during 4-day exposure.

The modified Carlson trophic status index, Shannon diversity index, and phytoplankton functional group index were used to assess ecological condition of a drinking water reservoir in central China. Applying all three indices together yielded a comprehensive ecological assessment, which could do so for other similar reservoirs.

Overall sex ratio of T. swinhonis was 1.03:1, not significantly different from 1:1. T. swinhonis was a spring-summer (March–August) multiple spawner with indeterminate fecundity. Sizes at first maturity for female and male were 84.47 and 81.86 mm, respectively. To catch T. swinhonis or release its predator is proposed for population control.

Pascal Laffaille takes great interests in fish ecology, especially focusing on the responses of fish populations and communities to anthropogenic disturbance. His current studies are aimed to propose management action plans.

The study showed significant changes in the maximum annual water temperatures in post-glacial lakes located in Poland in the years 1971-2015. The highest rate of increase in monthly maximum water temperature was recorded in April and the lowest in January and February. The value of maximum water temperature trends was lower than annual air temperature trends.

Nitrate-copper mix within legal limits resulted on higher zooplankton abundance by the end of the experiment. It is explained by nutrient enhancement what may counterbalance the copper toxicity on zooplankton, most likely increasing phytoplankton availability. Consequently, studies on assumed safe toxicant mixtures are needed as subtle effects can have relevant consequences on communities.

This article relates to variability of the internal loading process, both seasonal and spatial in years 2011-2016, to determine the impact of sustainable restoration. It has been shown that the commencement of restoration intensifies the release of phosphorus from sediments. It was gradually reduced in subsequent years, even after limiting the treatments.

Eleven agrochemicals tested on a microalga included a safener added in specific agrochemical formulations. One molecule was 2-fold more toxic than the mixture of all compounds. The safener decreased the toxicity of this herbicide that contains a halogen atom.

At the low food level, Brachionus angularis outcompeted B. calyciflorus and vice versa at the high food level. At the intermediate food level, B. angularis was displaced by B. calyciflorus at nearly all the initial inoculation densities except for 75% B. angularis at which both species coexisted.

The environmental factors altitude, salinity, hydroperiod and depth of water body affect the distribution of aquatic beetles in Northern Western Ghats, India. Some congeners showed different affinity to the altitude while some groups of different body forms co-occurred.