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131 results for “aquatic ecology”
Fig. 4 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 4: (Continued) for 3rd.
Fig. 1 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 1: Map of Singapore, showing locations of sampling sites.
Fig. 2 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 2: (Continued).
Fig. 4 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 4: Key to genera of Hydrophilidae of Singapore.
Fig. 2 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 2: Key to genera of Dytiscidae of Singapore.
Fig. 3 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 3: Key toNoteridae and Gyrinidae of Singapore.
Fig. 34 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 34. Distributionin temporary and/or permanent habitats.
Fig. 35 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 35. Number of Water Beetle Species recorded in and/or outside of Singapore Nature Reserves.
Fig. 33 in Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #
Fig. 33. Distributionin open and/or forested areas.
Data from: Antibiotics disrupt bacteria-phytoplankton symbioses: Unveiling ecological risks in aquatic ecosystems
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Data from: Extensive sympatry and frequent hybridization of ecologically divergent aquatic plants on the Qinghai-Tibetan Plateau
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Abiotic factors that prompt major ecological transitions: are fish on land to escape an intolerable aquatic environment?
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Data from: Addressing grand ecological challenges in aquatic ecosystems: How can mesocosms be used to advance solutions?
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Data from: How to characterize chemical exposure to predict ecologic effects on aquatic communities?
Reliable characterization of exposure is indispensable for ecological risk assessment of chemicals. To deal with mixtures, several approaches have been developed, but their relevance for predicting ecological effects on communities in the field has not been elucidated. In the present study, we compared nine metrics designed for estimating the total toxicity of mixtures regarding their relationship with an effect metric for stream macroinvertebrates. This was done using monitoring data of biota and organic chemicals, mainly pesticides, from five studies comprising 102 streams in several regions of Europe and South-East Australia. Mixtures of less than 10 pesticides per water sample were most common for concurrent exposure. Exposure metrics based on the 5% fraction of a species sensitivity distribution performed best, closely followed by metrics based on the most sensitive species and Daphnia magna as benchmark. Considering only the compound with the highest toxicity and ignoring mixture toxicity was sufficient to estimate toxicity in predominantly agricultural regions with pesticide exposure. The multisubstance Potentially Affected Fraction (msPAF) that combines concentration and response addition was advantageous in the study where further organic toxicants occurred. We give recommendations on exposure metric selection depending on data availability and the involved compounds.
Data from: Polar lakes may act as ecological islands to aquatic protists
A fundamental question in ecology is whether microorganisms follow the same patterns as multicellular organisms when it comes to population structure and levels of genetic diversity. Enormous population sizes, predominately asexual reproduction, and presumably high dispersal due to small body size could have profound implications on their genetic diversity and population structure. Here, we have analyzed the population genetic structure in a lake-dwelling microbial eukaryote (dinoflagellate) and tested the hypothesis that there is population genetic differentiation among nearby lake subpopulations. This dinoflagellate occurs in the marine-derived saline lakes of the Vestfold Hills, Antarctica, which are ice-covered most of the year. Clonal strains were isolated from four different lakes, and were genotyped using AFLP (Amplified Fragment Length Polymorphism). Our results show high genetic differentiation among lake populations despite their close geographical proximity (< 9 km). Moreover, genotype diversity was high within populations. Gene flow in this system is clearly limited, either due to physical or biological barriers. Our results discard the null hypothesis that there is free gene flow among protist lake populations. Instead, limnetic protist populations may differentiate genetically, and lakes act as ecological islands even on the microbial scale.
Data from: Phylogenetic signal in diatom ecology: perspectives for aquatic ecosystems biomonitoring
Diatoms include a great diversity of taxa and are recognized as powerful bioindicators in rivers. However using diatoms for monitoring programs is costly and time consuming because most of the methodologies necessitate species-level identification. This raises the question of the optimal tradeoff between taxonomic resolution and bioassessment quality. Phylogenetic tools may form the bases of new more efficient approaches for biomonitoring if relationships between ecology and phylogeny can be demonstrated. We estimated the ecological optima of 127 diatom species for 19 environmental parameters using count data from 2119 diatom communities sampled during 8 years in eastern France. Using uni- and multivariate analyses, we explored the relationships between freshwater diatom phylogeny and ecology (i.e. the phylogenetic signal). We found a significant phylogenetic signal for many of the ecological optima that were tested, but the strength of the signal varied significantly from one trait to another. Multivariate analysis also showed that the multidimensional ecological niche of diatoms can be strongly related to phylogeny. The presence of clades containing species that exhibit homogeneous ecology suggests that phylogenetic information can be useful for aquatic biomonitoring. This study highlights the presence of significant patterns of ecological optima for freshwater diatoms in relation to their phylogeny. These results suggest the presence of a signal above the species level, which is encouraging for the development of simplified methods for biomonitoring survey.
FIGURE 2. Trichodrilus strandi. A in Aquatic oligochaetes (Annelida: Clitellata) of the Czech Republic: check-list, new records, and ecological remarks
FIGURE 2. Trichodrilus strandi. A: Schematic drawing of reproductive organs in IX, X, XI segment, lateral view. mp: male pore on conical porophorus, sp: spermatheca, ov: ovarium. B: dorsal chaeta.
FIGURE 1 in Aquatic oligochaetes (Annelida: Clitellata) of the Czech Republic: check-list, new records, and ecological remarks
FIGURE 1. The distribution of Trichodrilus strandi, Pristina jenkinae, Pristina osborni, Rhyacodrilus subterraneus, Aulodrilus limnobius and A. pigueti in the Czech Republic.
FIGURES 39–42 in New Neotropical and Nearctic species of water beetles in the genera Hydraena Kugelann and Ochthebius Leach, a key to North American genera and subgenera of the family, new distribution records, and a synopsis of ecology, behavior and morphology related to aquatic life (Coleoptera: Hydraenidae)
FIGURES 39–42. Behavior and morphology of exocrine secretion delivery systems of Hydraena and Ochthebius. 39–40) Hydraena americana Jäch. 39) Schematic. a) Beetle balanced on edge, tibiae of the right legs resting on the surface of a wet leaf, the left legs performing secretion-grooming. b) Secretion-grooming movements of left tibiae (note pivotal role of middle leg). c) Locations of exocrine gland pore areas. 40) Venter of left side of prothorax, external and internal, showing components of exocrine secretion delivery system. 41) Ochthebius arenicolus Perkins, ventral aspect of head and prothorax. 42) Ochthebius glaber Montes & Soler, ventral aspect of left side of head and adjacent area of prothorax, showing external cuticular features of antennal pocket and internal end-apparatus and ductules. For more context and SEMs see Perkins (1997).
FIGURES 34–35. Habitus and male genitalia.34 in New Neotropical and Nearctic species of water beetles in the genera Hydraena Kugelann and Ochthebius Leach, a key to North American genera and subgenera of the family, new distribution records, and a synopsis of ecology, behavior and morphology related to aquatic life (Coleoptera: Hydraenidae)
FIGURES 34–35. Habitus and male genitalia.34. Ochthebius (Gymnochthebius) falli (Perkins).35. Ochthebius (Gymnochthebius) fossatus LeConte.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.