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53 results for “fish community structure”
Common barriers, but temporal dissonance: genomic tests suggest ecological and paleo-landscape sieves structure a coastal riverine fish community
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Structure of small tropical islands freshwater fish and crustacean communities: a niche- or dispersal-based process?
Determining the relative importance of niche- and dispersal-based processes in the structuring of animal communities is central in ecology. Freshwater fish and crustacean communities of small tropical islands can bring new insights for understanding these processes as all their species present a pelagic larval stage which gives them important dispersal capacities. Consequently, we hypothesized that dispersal-based process maybe preponderant for structuring these communities from the regional- to the local, i.e. survey site, scales. Gradient forest analyses allowed us to model the effect of 12 environmental variables on freshwater taxa abundances in two southwestern Indian Ocean islands: Mayotte (26 taxa) and Reunion (21). A total of 153 surveys in Mayotte and 266 in Reunion were used for building the models. Despite the strong heterogeneity of environmental conditions between the two islands, the main factors structuring freshwater fish and crustacean communities in both islands were the elevation and the slope of the sites. The observed structure appeared more pronounced for predatory species than for primary consumers and omnivores. As predators generally have limited locomotor capacities, it is concluded that dispersal-based process structures these communities not only at large geographical scales but also at the intra-watershed scale, by limiting the inland penetration (or dispersion) of species in relation to their locomotor capacities. However, more knowledge concerning ecological traits and taxonomic status of many species is needed to confirm this assumption.
Within-lake variation in fish predation risk shapes the spatio-temporal structure of the zooplankton community
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Data from: River network architecture, genetic effective size and distributional patterns predict differences in genetic structure across species in a dryland stream fish community
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Structure of small tropical islands freshwater fish and crustacean communities: a niche- or dispersal-based process?
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"Characteristics of demersal fish community structure during summer hypoxia in the Pearl River Estuary, China"
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FIGURE 5 in Habitat and community structure modulate fish interactions in a neotropical clearwater river
FIGURE 5 | Agonistic interactions between fishes in three habitats of the Olho d´Água River, upper Paraguay River basin, Brazil. Arrow thickness is proportional to agonistic interaction intensity in all three habitats; grey circles are proportional to the mean abundance of each species. Ast lac = Astyanax lacustris, Ast lin = Astyanax lineatus, Ast mar = Astyanax marionae, Bry mel = Bryconops melanurus, Cha spp = Characidium spp., Cre lep = Crenicichla lepidota, Cre vit = Crenicichla vittata, Hyp equ = Hyphessobrycon eques, Jup aca = Jupiaba acanthogaster, Lep vit = Leporellus vittatus, Moe bon = Moenkhausia bonita, Odo peq = Odontostilbe pequira, Par nas = Parodon nasus, Pro lin = Prochilodus lineatus, Ser cal = Serrapinnus calliurus.
FIGURE 4 in Habitat and community structure modulate fish interactions in a neotropical clearwater river
FIGURE 4 | Principal coordinate analysis (PCoA) and permutational analysis of variance (PERMANOVA) to demonstrate feeding pressure variation among habitats accounting for A. species and B. trophic groups, points sized according to the sum of the feeding pressure in the sample (logarithm scaled for better visualization). Red lines indicate significative variables (p <0.05) while black lines non-significative. Anc spp = Ancistrus spp., Ast lac = Astyanax lacustris, Ast lin = Astyanax lineatus, Ast mar = Astyanax marionae, Bry hil = Brycon hilarii, Cha spp = Characidium spp., Cic dim = Cichlasoma dimerus, Cre lep = Crenicichla lepidota, Hyp equ = Hyphessobrycon eques, Jup aca = Jupiaba acanthogaster, Lep fri = Leporinus friderici, Meg mac = Megaleporinus macrocephalus, Lep str = Leporinus striatus, Lep vit = Leporellus vittatus, Odo peq = Odontostilbe pequira, Par nas = Parodon nasus, Pro lin = Prochilodus lineatus, Ser cal = Serrapinnus calliurus.
Fig. 3 in Disentangling the influences of habitat structure and limnological predictors on stream fish communities of a coastal basin, southeastern Brazil
Fig. 3. Results of partial Redundant Analyses (pRDA) showing the patterns of correlation among species abundance with the pure limnological (a), and pure structural (b) predictors. The asterisks indicate environmental variables which were statistically correlated (p ≤ 0.05) with community composition. Only species with eigenvectors higher than 0.2 were identified by their abbreviated symbols. The others were identified by black dots. This limit was arbitrary but chosen to evidence only the species which were mostly correlated with environmental predictors.
Fig. 2 in Disentangling the influences of habitat structure and limnological predictors on stream fish communities of a coastal basin, southeastern Brazil
Fig. 2. Results of the Principal Component Analysis (PCA) showing the clearwater (open circles) and blackwater (black circles) sites.
Fig. 1 in Disentangling the influences of habitat structure and limnological predictors on stream fish communities of a coastal basin, southeastern Brazil
Fig. 1. Hydrography and location of the sampling sites (first to third-order streams) in the coastal plain of Itanhaém River basin, southeastern Brazil. Open circles: clearwater streams. Black circles: blackwater streams.
Data from: Strong effects of coral species on the diversity and structure of reef fish communities: a multi-scale analysis
While there is increasing evidence for habitat specialization in coral reef fishes, the extent to which different corals support different fish communities is not well understood. Here we quantitatively assess the relative importance of different coral species in structuring fish communities and evaluate whether sampling scale and coral colony size affect the perceived strength of fish-habitat relationships. Fish communities present on colonies of 8 coral species (Porites cylindrica, Echinopora horrida, Hydnophora rigida, Stylophora pistillata, Seriatopora hystrix, Acropora formosa, A. tenuis and A. millepora) were examined in the Lizard Island lagoon. Additionally, the differences in fish communities supported by 3 coral species (P. cylindrica, E. horrida, H. rigida) were investigated at 3 spatial scales of sampling (2x2 m, 1x1 m, 0.5x0.5 m). Substantial differences in fish communities were observed across the different coral species, with E. horrida and H. rigida supporting the most fish species and individuals. Coral species explained more of the variability in fish species richness (20.9-53.6%), than in fish abundance (0-15%). Most coral species supported distinctive fish communities, with dissimilarities ranging from 50 to 90%. For 3 focal coral species, a greater amount of total variation in fish species richness and fish abundance was evident at a larger scale of sampling. Together, these results indicate that the structure of reef fish communities is finely tuned to coral species. Loss of preferred coral species could have profound effects on reef fish biodiversity, more so than would be predicted on the basis of declining coral cover alone.
Data from: Strong effects of coral species on the diversity and structure of reef fish communities: a multi-scale analysis
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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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.