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68 results for “Food web structure”
A unified dataset of co-located sewage pollution, periphyton, and benthic macroinvertebrate community and food web structure from Lake Baikal (Siberia)
Sewage released from lakeside development can introduce nutrients and micropollutants that can restructure aquatic ecosystems. Lake Baikal, the world's most ancient, biodiverse, and voluminous lake, has been experiencing localized sewage pollution from lakeside settlements. Increasing filamentous algal abundance suggests benthic communities are responding to this localized pollution. We surveyed 40-km of Lake Baikal's southwestern shoreline 19-23 August 2015 for sewage indicators, including pharmaceuticals, personal care products, and microplastics with co-located periphyton, macroinvertebrate, stable isotope, and fatty acid sampling. Unique identifiers corresponding to sampling locations are retained throughout all data files to facilitate interoperability among the dataset's 150+ variables. The data are structured in a tidy format (a tabular arrangement familiar to limnologists) to encourage future reuse. For Lake Baikal studies, these data can support continued monitoring and research efforts. For global studies of lakes, these data can help characterize sewage prevalence and ecological consequences of anthropogenic disturbance across spatial scales.
Hydrology and trophic flexibility structure alpine stream food webs in the Teton Range, Wyoming, USA
<p>Data and code necessary to replicate the findings from the manuscript titled "Hydrology and trophic flexibility structure alpine stream food webs in the Teton Range, Wyoming, USA".</p> <p><span>Abstract:</span><strong><span> </span></strong><span>Understanding biotic interactions and how they vary across habitats is important for assessing the vulnerability of communities to climate change. Receding glaciers in high mountain areas can lead to the hydrologic homogenization of streams and reduce habitat heterogeneity, which are predicted to drive declines in regional diversity and imperil endemic species. However, little is known about food web structure in alpine stream habitats, particularly among streams fed by different hydrologic sources (e.g., glaciers or snowfields). We used gut content and stable isotope analyses to characterize food web structure of alpine macroinvertebrate communities in streams fed by glaciers, subterranean ice, and seasonal snowpack in the Teton Range, Wyoming, USA. Specifically, we sought to: (1) assess community resource use among streams fed by different hydrologic sources; (2) explore how variability in resource use relates to feeding strategies; and (3) identify which environmental variables influenced resource use within communities. Average taxa diet differed among all hydrologic sources, and food webs in subterranean ice-fed streams were largely supported by the gold alga <em>Hydrurus</em>. This finding bolsters a hypothesis that streams fed by subterranean ice may provide key habitat for cold-water species under climate change by maintaining a longer growing season for this high-quality food resource. While a range of environmental variables associated with hydrologic source (e.g., stream temperature) were related to diet composition, hydrologic source categories explained the most variation in diet composition models. Less variable diets within versus among streams suggests high trophic flexibility, which was further supported by high levels of omnivory. This inherent trophic flexibility may bolster alpine stream communities against future changes in resource availability as the mountain cryosphere fades. Ultimately, our results expand understanding of the habitat requirements for imperiled alpine taxa while empowering predictions of their vulnerability under climate change.</span></p>
Data for "Species richness and food-web structure jointly drive community biomass and its temporal stability in fish communities"
<p>Data for the paper "Species richness and food-web structure jointly drive community biomass and its temporal stability in fish communities" which is in minor revision in Ecology Letters (manuscript id:ELE-00589-2021.R1). A doi will be provided upon publication.</p> <p>Current citation: Danet, A., Mouchet, M., Bonnaffé, W., Thébault, E., & Fontaine, C. (In revision) Species<br> richness and food-web structure jointly drive total biomass and its temporal stability in<br> fish communities Minor revision in Ecology Letters.</p> <p>The repository constains data describing fish community monitoring across stream sections in metropolitan France over the period 1995-2018 by the French Office of Water and Aquatic Ecosystems (ONEMA) using electrofishing.</p> <p>The repository contains:</p> <ul> <li> description of fishing: fishing_protocol.csv <ul> <li>surface: sampled surface</li> <li>opcod: fishing operation code, a unique identifier for each sampling event</li> <li>station: unique identifier for each site</li> <li>nb_sp, nb_ind: number of species, number of individuals</li> </ul> </li> <li>geographical information: station_basin.csv <ul> <li>X, Y: spatial coordinates of the station, expressed in metres in Lambert93 (epsg:2154)</li> <li>basin: name of the hydrographic basin</li> </ul> </li> <li>environment: environment.csv ( _mean: mean, _med: median, _cv: coefficient of variation) <ul> <li>alt: altitude</li> <li>d_source: distance to source</li> <li>strahler: strahler order</li> <li>BOD: Biological Oxygen Demand</li> <li>temperature: water temperature</li> <li>flow: water flow</li> </ul> </li> <li>community data: community_data.csv <ul> <li>species: three digits code corresponding to a given species (see Table S1, Danet et al. in revision)</li> <li>nind: number of individuals</li> <li>biomass: biomass in gram</li> </ul> </li> <li>Length of each fish individual: fish_length.csv <ul> <li>length: length of the fish in millimeter</li> </ul> </li> <li>Inferred food-web: class_network.rda <ul> <li>data: <ul> <li>class_id: size class of a fish individual</li> </ul> </li> <li>network: these data.frame can be handled by igraph::graph_from_data_frame() <ul> <li>from, to: "to" eats "from"</li> </ul> </li> <li>composition: <ul> <li>sp_class: concatenation of species and class_id columns</li> <li>bm_std: biomass reported to the sampled surface</li> </ul> </li> </ul> </li> </ul> <p> </p> <p> </p>
Fig. 3 in Scientific note Preliminary examination of food web structure of Nicola Lake (Taim Hydrological System, south Brazil) using dual C and N stable isotope analyses
Fig. 3. Trophic position estimates of fishes collected at Nicola Lake, Taim Hydrological System. # symbols denotes different individuals of the same species.
Fig. 2 in Scientific note Preliminary examination of food web structure of Nicola Lake (Taim Hydrological System, south Brazil) using dual C and N stable isotope analyses
Fig. 2. Plot of δ15N and δ13C values for plants (), mollusks () and fishes () collected at Nicola Lake, Taim Hydrological System. Sources of carbon assimilated by consumers are indicated by the relative positions of taxa on the x-axis; trophic level is indicated by relative position on the y-axis. The dashed line distinguishes between producers and consumers. # symbols denotes different individuals of the same species.
Fig. 1 in Scientific note Preliminary examination of food web structure of Nicola Lake (Taim Hydrological System, south Brazil) using dual C and N stable isotope analyses
Fig. 1. Patos-Mirim Lagoon complex (ca. 14,000 Km2) (A) in southern Brazil showing the Taim Hydrological System (B) with the ecological reserve's limits (320.4 Km2) and Nicola Lake (2.45 Km2) (C).
Data for: Richness, food webs structures and ecosystem functioning
<p>This dataset has information on the spatial distribution of fish species from the middle Paraná River and the diet information of 15 fish-eating species. The objective of the paper was to evaluate the relationship between richness, the structure of food webs and standing biomass. In addition to the information on diet and spatial distribution, there is a readme file, two Rstudio scripts and an R environment (all the results of the work can be found in the latter).</p>
Changes in vertical and horizontal diversities mediated by the size structure of introduced fish collectively shape food-web stability
<p><span>Species introductions can alter local food-web structure by changing the vertical or horizontal diversity within communities, largely driven by their body size distributions. Increasing vertical and horizontal diversities is predicted to have opposing effects on stability. However, their interactive effects remain largely overlooked. We investigated the independent and collective effects of vertical and horizontal diversities on food-web stability</span><span> in alpine lakes stocked with variable body size distributions of introduced fish species. I</span><span>ntroduced predators destabilize food-webs by </span><span>increasing vertical diversity through food chain lengthening</span><span>. Alternatively, increasing horizontal diversity results in more </span><span>stable food-web topologies. A non-linear interaction between vertical and horizontal diversities </span>suggests that increasing vertical diversity is most destabilizing when horizontal diversity is low<span>.</span> <span>Our findings suggest </span>that the size structure of introduced predators drives their impacts on stability by modifying the structure of food-webs, and highlights the <span>interactive effects of vertical and horizontal diversities on stability.</span></p>
Data from: Changes in Invertebrate Food Web Structure Between High- and Low-productivity Environments are Driven by Intermediate but Not Top Predator Diet Shifts
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Data for: Richness, food webs structures and ecosystem functioning
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Invasive spread in meta-food-webs depends on landscape structure, fertilization and species characteristics
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Changes in vertical and horizontal diversities mediated by the size structure of introduced fish collectively shape food-web stability
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Lake food webs: Species invasion progressively disrupts the trophic structure of native food webs
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Arthropod food webs in the foreland of a retreating glacier: Gut content analysis and structural equation modeling (SEM)
<p>Below- and above-ground arthropod communities were explored at a glacier foreland area in low Arctic Southwest Greenland aiming for a better understanding of the mechanisms behind the arthropod succession driven by increasing temperatures in the context of an Arctic climate change scenario. Arthropods were sampled in 2015 and 2016 along a downslope transect where the microclimate became warmer downhill a chronosequence towards a climax vegetation. The arthropod data sets were analyzed in relation to an environmental data set. Bottom-up controlled population developments were important in the early phase of the vegetation development while top-down prevailed in the later phase of the vegetation development. The shift from bottom-up to top-down cascades between arthropod predators and their potential prey populations was mainly driven by increasing temperatures away from the glacier. Structural equation modeling (SEM) shows bottom-up and top-down controlled food chains as bottom-up control was important for spider and harvestman populations while top-down control was important for ground beetle populations. These mechanisms are closely related to the hunting strategies of the predators as bottom-up mechanisms are connected to a sit-and-wait behavior while top-down mechanisms are related to active-search behavior. The SEM analyzes were supported by DNA metabarcoding as well as by the literature. A consequence of the strong top-down cascades in the later phase of the succession is high rates of intra-guild predation (IGP) among all arthropod predators. Particularly in the guts of the linyphiid spider, <em>Collinsia holmgreni </em>Thorell 1871, trophic linkages to other linyphiid and lycosid spiders were detected. The IGP ratio of <em>C. holmgreni</em> was negatively correlated with the activity density of available ground-living prey. Probably as a consequence of the high IGP among the linyphiid spiders, cold-adapted linyphiid species like <em>C. holmgreni</em> decreased in numbers downhill and became extinct in the warmer climax vegetation, where lycosid spiders dominated. SEM shows that the declining activity densities of the soil fauna, such as collembolans and mites, due to predation, are responsible for the increase in organic matter content in the topsoil.</p>
Changes in phytoplankton size-structure alter trophic-transfer in a temperate, coastal planktonic food-web
<p>Datasets, Metadata, Figures and Matlab codes used to produce the figures used in "Changes in phytoplankton size-structure alter trophic-transfer in a temperate, coastal planktonic food-web"</p>
The influence of food web structure and foraging behaviour on visual system traits in a predatory freshwater fish
<p>Dataset used in the manuscript titled "The influence of food web structure and foraging behaviour on visual system traits in a predatory freshwater fish" Dataset includes lake trout visual system traits, body size, and food web structural attributes sampled from four different lakes in Algonquin, ON, Canada.</p>
Nonnative fish facilitate nonnative snails and alter food web structure in experimental pond communities
<p>1. Contemporary ecosystems commonly support multiple nonnative species, which can alter community structure and interact with one another directly and indirectly. Novel interactions between invasive species can result in the facilitation or suppression of one or both invaders, making it important to understand the underlying mechanisms that affect invasion outcomes. </p> <p>2. Goldfish (<em>Carassius</em> <em>auratus</em>) and Chinese mystery snails (<em>Cipangopaludina</em> <em>chinensis</em>) are freshwater species that have been introduced widely through the aquarium trade and co-occur in their nonnative ranges. We used an outdoor mesocosm experiment to assess separate and combined effects of goldfish and mystery snails on pond community structure and to investigate whether goldfish and mystery snails affected one another positively, neutrally, or negatively. We predicted that the distinct trophic levels of each species and the anti-predator traits of mystery snails would lead to positive interactions between invaders and synergistic effects on the aquatic community. </p> <p>3. Goldfish directly increased turbidity and decreased floating filamentous algae, zooplankton, juvenile native snails, and survival of amphibians via consumptive effects. Goldfish indirectly increased attached periphyton, phytoplankton, and body size of surviving native green frogs (<em>Lithobates</em> <em>clamitans</em>) through trophic cascades and/or release from competition. Mystery snails had more subtle effects, including reducing growth rates of native gray tree frogs (<em>Hyla</em> <em>versicolor</em>), likely through competitive interactions. </p> <p>4. With goldfish present, mystery snails showed increased reproductive success (higher total biomass of juveniles), likely due to indirect competitive release from other herbivores. In contrast to their effects on native snails, goldfish did not consume juvenile mystery snails, likely due to their unique traits (e.g., large size and shell thickness). Mystery snails slightly reduced goldfish growth but did not affect their survival. </p> <p>5. These results suggest unidirectional facilitation between invaders via indirect changes in the food web. Overall, our study found strong direct and indirect effects of invasive aquarium species, particularly goldfish, and provides experimental support for the invasional meltdown hypothesis within urban waterbodies, which are especially prone to invasions.</p>
Data from: Predator kairomones change food web structure and function, regardless of cues from consumed prey
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Data from: Seasonal variations in planktonic food web structure affect stability by shifting the distribution of energy fluxes
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Interannual structure of the bathyal deep-sea food-web at South Sandwich Islands (Southern Ocean): Stable isotope values of 𝛅13C and 𝛅15N
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
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.