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212 results for “fish ecology”
Fig. 5 in Impact of ecotourism on the fish fauna of Bonito region (Mato Grosso do Sul State, Brazil): ecological, behavioural and physiological measures
Fig. 5. Variation of behaviour patterns between No Tourism and Tourism sites for Crenicichla lepidota (mean and SEM); (a) Feeding; (b) Agonistic activity; (c) Escape behaviour. Lighter bars = No Tourism site; darker bars = Tourism site. (Mann-Whitney U-test). N= 35; * p <0.05; ** p <0.01; ***p <0.0001.
Fig. 6 in Impact of ecotourism on the fish fauna of Bonito region (Mato Grosso do Sul State, Brazil): ecological, behavioural and physiological measures
Fig. 6. Variation of behaviour patterns between before (8h00) and after (9h00) the first disturbance of tourists in the river (mean and SEM) for Crenicichla lepidota. (a) Tourism; (b) No Tourism. Lighter bars = 8h00; darker bars = 9h00 (Mann-Whitney U-test). N = 35; *p <0.05; **p <0.01;***p <0.0001.
Fig. 7 in Impact of ecotourism on the fish fauna of Bonito region (Mato Grosso do Sul State, Brazil): ecological, behavioural and physiological measures
Fig. 7. Variation of behaviour patterns between No Tourism and Tourism site for M. bonita (mean and SEM); (a) Feeding; (b) Escape. Lighter bars = No Tourism; darker bars = Tourism. (Mann -Whitney U-test). N= 70; *p <0.05; **p <0.01; ***p <0.0001.
Fig. 4 in Impact of ecotourism on the fish fauna of Bonito region (Mato Grosso do Sul State, Brazil): ecological, behavioural and physiological measures
Fig. 4. Multidimensional scaling ordinations showing local differences in (a) No Tourism site and (b) Tourism site. Each individual point represents a replicate sample (census). Circles = No Tourism site; Triangles = Tourism site.
Fig. 4 in Influence of a large dam and importance of an undammed tributary on the reproductive ecology of the threatened fish matrinxã Brycon orthotaenia Günther, 1864 (Characiformes: Bryconidae) in southeastern Brazil
Fig. 4. Relative frequency of maturity stages of Brycon orthotaenia captured in two sites of the rio São Francisco, downstream from the Três Marias Dam. (a) females from site 1, (b) females from site 2, (c) males from site 1 and (d) males from site 2. Resting, light gray; maturing/mature, dark gray; spawning/spent, black.
Fig. 2 in Influence of a large dam and importance of an undammed tributary on the reproductive ecology of the threatened fish matrinxã Brycon orthotaenia Günther, 1864 (Characiformes: Bryconidae) in southeastern Brazil
Fig. 2. Histological sections of Brycon orthotaenia ovaries stained with Hematoxilin-eosin: (a) resting stage presenting early (O1) and late (O2) perinucleolar follicles, (b)(c) maturing/mature stage presenting O1, O2, previtellogenic follicles (O3) and vitellogenic follicles (O4), (d) vitellogenic follicles containing yolk globules (Y), zona radiata (ZR) and follicular cells (FC), (e) spawned stage from site 2 with postovulatory follicles (asterisk) and rare vitellogenic atretic follicles (AF), (f)(g)(h) ovaries of B. orthotaenia collected in site 1 possessing several vitellogenic atretic follicles triggered by the cold water released by the Três Marias Dam, (f) vitellogenic follicle in early atresia with fragmented zona radiata (arrows), (g) hypertrophy of follicular cells, fragmented zona radiata (arrows) and yolk being degraded in atretic follicle and (h) vitellogenic follicle in advanced atresia. Bar = (a), (b), (h) 70 µm, (c) 160 µm, (d) 40 µm, (e) 100 µm, (f) 120 µm and (g) 50 µm.
Data from: The ecological and genetic basis of convergent thick-lipped phenotypes in cichlid fishes
The evolution of convergent phenotypes is one of the most interesting outcomes of replicate adaptive radiations. Remarkable cases of convergence involve the thick-lipped phenotype found across cichlid species flocks in the East African Great Lakes. Unlike most other convergent forms in cichlids, which are restricted to East Africa, the thick-lipped phenotype also occurs elsewhere, e.g. in the Central American Midas Cichlid assemblage. Here we use an ecological genomic approach to study the function, the evolution and the genetic basis of this phenotype in two independent cichlid adaptive radiations on two continents. We applied phylogenetic, demographic, geometric morphometric and stomach-content analyses to an African (Lobochilotes labiatus) and a Central American (Amphilophus labiatus) thick-lipped species. We found that similar morphological adaptations occur in both thick-lipped species and that the 'fleshy' lips are associated with hard-shelled prey in the form of mollusks and invertebrates. We then used comparative Illumina RNA sequencing of thick versus normal lip tissue in East African cichlids and identified a set of 141 candidate genes that appear to be involved in the morphogenesis of this trait. A more detailed analysis of six of these genes led to three strong candidates: Actb, Cldn7 and Copb. The function of these genes can be linked to the loose connective tissue constituting the fleshy lips. Similar trends in gene expression between African and Central American thick-lipped species appear to indicate that an overlapping set of genes was independently recruited to build this particular phenotype in both lineages.
Fig. 1 in Feeding ecology of a stream fish assemblage in an Atlantic Forest remnant (Serra do Japi, SP, Brazil)
Fig. 1. Location of the Serra Japi in the APAs of Jundiaí, Cabreúva, Cajamar and in the municipality of Pirapora do Bom Jesus (SP), showing sampling sites in the different streams. Adapted from "Atlas das Unidades de Conservação Ambiental do Estado de São Paulo- Parte II-Interior, SMA, 1998".
Fig. 1 in Local ecological and taxonomic knowledge of snapper fish (Teleostei: Actinopterygii) held by fishermen in Ilhéus, Bahia, Brazil
Fig. 1. Map of Bahia State, Brazil, indicating the location of the fishing colonies Z19 and Z34, continental shelf and the municipality of Ilhéus.
Fig. 7 in Ecology and life history of an Amazon floodplain cichlid: the discus fish Symphysodon (Perciformes: Cichlidae)
Fig. 7. Length vs. weight plots for Symphysodon haraldi specimens parasitized with the isopod gill parasite Braga cichlae, and unparasitized specimens. All specimens are from a single colony of discus in Uxi Bay, lago Amanã.
Fig. 4 in Ecology and life history of an Amazon floodplain cichlid: the discus fish Symphysodon (Perciformes: Cichlidae)
Fig. 4. (right column) Testes and ovaries of Symphysodon haraldi at advancing stages of gonadal development. Photographs are from freshly sacrificed and dissected specimens, with the gonads outlined for clarity. The following modified version of Nikolsky's scale of reproductive maturity was utilized: 0. (immature): gonads thin and transparent; sex determination not possible (not illustrated). 1. (early development or resting): testes thin and translucent; ovaries thin and translucent-pink with transparent eggs. 2. (maturing): testes translucent white; ovaries enlarged with white eggs. 3. (mature): testes thick and white; ovaries enlarged with largest eggs yellow. 4. (pre-spawning): testes swollen and sperm-positor everted; ovaries swollen with largest eggs orange, swollen and approximately 1.4 mm in diameter, ovipositor everted. 5. (spent): testes flaccid; ovaries flac- cid with scattered eggs of various size classes (not illustrated).
Fig. 2 in Ecology and life history of an Amazon floodplain cichlid: the discus fish Symphysodon (Perciformes: Cichlidae)
Fig. 2. (a) Flood level and (b) electrical conductivity (EC) monitored in lago Amanã during the period 1995-1998. The timing of sampling in Uxi Bay is marked by A (1998) and B (1997). Dotted horizontal lines mark where shore-scrub (4m) and higher portions of blackwater igapó forest (10m) are inun- dated (Fig. 1). Dotted circles are speculated spawning events for the putative cohort groups 1a through 3 (refer to Fig. 8).
Figure 4 in A review of amphidromous freshwater fishes of the Chocó biogeographical region (Colombia and Ecuador): diversity, ecology, fisheries and conservation
Figure 4. – Some amphidromous species from the rivers of the Chocó Biogeographic Region. A: Eleotris picta; B: Gobiomorus maculatus; C: Awaous transandeanus; D: Hemieleotris latifasciata; E: Sicydium hildebrandi.
Data from: Ecological constraints coupled with deep-time habitat dynamics predict the latitudinal diversity gradient in reef fishes
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Data from: Genomic architecture of ecologically divergent body shape in a pair of sympatric crater lake cichlid fishes
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Data from: Unravelling the macro-evolutionary ecology of fish-jellyfish associations: life in the ‘gingerbread house’
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Data from: Exploring the nature of ecological specialization in a coral reef fish community: morphology, diet, and foraging microhabitat use
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Data from: The predictability and magnitude of life-history divergence to ecological agents of selection: a meta-analysis in livebearing fishes
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Data from: Heterospecific aggression and dominance in a guild of coral-feeding fishes: the roles of dietary ecology and phylogeny
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Data from: Species-specific differences in adaptive phenotypic plasticity in an ecologically relevant trophic trait: hypertrophic lips in Midas cichlid fishes
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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.