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48 results for “Forage fish”
Data and code from: Chemical cues facilitate foraging across the water-land interface in a resident predatory fish
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Data from: Foraging environment determines the genetic architecture and evolutionary potential of trophic morphology in cichlid fishes
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Data for: Long-wavelength-sensitive (lws) opsin gene expression, foraging and visual communication in coral reef fishes
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Data for fish foraging and anti-predator escape behavior
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Data from: Life at the top: lake ecotype influences the foraging patterns, metabolic costs and life history of an apex fish predator
1.We used acoustic telemetry and acceleration sensors to compare population-specific measures of the metabolic costs of an apex fish predator living in four separate lakes. We chose our study species and populations to provide a strong test of recent theoretical predictions that optimal foraging by an apex fish predator in a typical aquatic environment would be consistent with feeding to satiation rather than continuous feeding. We chose four populations where the primary prey type differed along a body size gradient (from small invertebrates to large planktivorous fish) and along a thermal accessibility gradient (from easily accessible coldwater pelagic prey to less accessible warmwater epilimnetic and littoral prey). We expected that these gradients in prey type would evoke distinctly different activity gradients depending on whether predators fed to satiation (e.g. less frequent 'rest' detections where primary prey are smaller/less accessible) or fed continuously (e.g. fixed level of 'rest' detections under all prey conditions). 2. Our study organism was a fall spawning, coldwater visual apex predator (lake trout). Therefore, we focused our study on diel (early night, dawn, day, dusk, late night) changes in metabolic costs associated with summer feeding behaviour. The duration (~20 days) and fine temporal scale (~30 minutes) of our behavioural data provided a uniquely detailed picture of intra- and inter-population differences in activity patterns over a critical period in the annual growing season. 3. In all populations, diel shifts in activity were qualitatively consistent with that expected of a visual predator (e.g. resting state detections were most frequent at night). 4. Between-lake differences in daytime thermal experience were qualitatively consistent with between-lake differences in the location of primary prey (e.g. excursions to warm habitats were common in lakes with epilimnetic/littoral fish as primary prey and relatively rare in lakes with pelagic coldwater invertebrates/fish as primary prey). 5. Daytime activity patterns were consistent with feeding to satiation rather than continuous feeding: (a) individuals in all four populations exhibited clearly delineated bouts of resting behaviour and active behaviour; (b) the frequency of resting bouts and the resultant overall cost of daily activity were strongly associated with the size and accessibility of prey – in lakes with smaller and/or less accessible prey, predators rested less frequently, exhibited marginally higher costs when active and had higher overall daytime activity costs. Within each lake, similar changes in activity occurred concurrently with diel changes in prey accessibility/relative density.
Data from: Local forage fish abundance influences foraging effort and offspring condition in an Endangered marine predator
1. Understanding the functional relationship between marine predators and their prey is vital to inform ecosystem-based management. However, collecting concurrent data on predator behaviour and their prey at relevant scales is challenging. Moreover, opportunities to study these relationships in the absence of industrial fishing are extremely rare. 2. We took advantage of an experimental fisheries closure to study how local prey abundance influences foraging success and chick condition of Endangered African penguins Spheniscus demersus in the Benguela Ecosystem. 3. We tracked 75 chick-provisioning penguins with GPS-time-depth devices, measured body condition of 569 chicks, quantified the diet of 83 breeding penguins and conducted 12 forage fish hydro-acoustic surveys within a 20 km radius of Robben Island, South Africa, over three years (2011–2013). Commercial fishing for the penguins' main prey, sardine Sardinops sagax and anchovy Engraulis encrasicolus, was prohibited within this 20 km radius during the study period. 4. Local forage fish abundance explained 60% of the variation in time spent diving for 14 penguins at sea within 2 days of a hydro-acoustic survey. Penguin foraging effort (time spent diving, number of wiggles per trip, number of foraging dives and the maximum distance travelled) increased and offspring body condition decreased as forage fish abundance declined. In addition, quantile regression revealed that variation in foraging effort increased as prey abundance around the colony declined. 5. Policy implications. Our results demonstrate that local forage fish abundance influences seabird foraging and offspring fitness. They also highlight the potential for offspring condition and the mean-variance relationship in foraging behaviour to act as leading indicators of poor prey abundance. By rapidly indicating periods where forage resources are scarce, these metrics could help limit seabird-fisheries competition and aid the implementation of dynamic ocean management.
FIGURE 1 in The trophic niche of sculpins Cottus spp. in forage fish assemblages of boreal lakes
FIGURE 1 Biplots of trophic niche positions (total mass size-adjusted muscle δ15N vs δ13C) for individual small-bodied fishes sampled from representative Far North Lakes, (a) Goods and (b) Kapkichi and Near North Lakes, (c) Temagami and (d) Wanapitei, of Ontario, Canada. Trophic niches, represented by fitted 1 SD bivariate ellipses, of Cottus spp (,) and all other species (,); numbers beside ellipses correspond to the species index of Table 2
FIGURE 2 in The trophic niche of sculpins Cottus spp. in forage fish assemblages of boreal lakes
FIGURE 2 Boxplots (, median;, interquartile range;, 1.5 times the length of the box;, outliers) showing separation of trophic niche positions in δ13C–δ15N space (distance between centroids) between Cottus spp. and (a) all co-habiting small-bodied fish species and (b) Perca flavescens, for Far North and Near North Lakes of Ontario, Canada. Test results are for two-sample t-tests
Data from: Resource heterogeneity but not inbreeding affects growth and grouping behaviour in socially foraging juvenile cichlid fish
<p>1. Spatial food distribution determines resource profitability, defensibility and encounter rate of foragers. Clumped food distribution can promote aggressiveness and resource monopolisation, in turn increasing within-group variation in food intake and growth. However, the effects of food distribution may depend on foraging strategies. Little is known about the impact of spatial food heterogeneity on growth and grouping behaviour in social foragers in the absence of monopolisation.</p> <p>2. Social foraging is present in many fishes, particularly at early juvenile life stages when fish are especially sensitive to environmental variation. Here, a heterogeneous food distribution may impair foraging success and growth and juveniles may increase sociability to attain social information about food resources.</p> <p>3. We examined the impact of the spatial distribution of food as well as inbreeding on growth and social behaviour in juveniles of the cichlid fish <i>Pelvicachromis pulcher. </i>Inbred individuals often show poorer performance than outbred individuals (inbreeding depression), but inbreeding effects can be environment-dependent. In the experiment, in- and outbred fish were reared in a split-clutch design either under homogeneously distributed or spatially clumped food conditions for eight weeks starting one week after juveniles could actively feed. We documented growth and performed a shoaling assay and a sociality test (choice between a large vs. a small shoal) after six weeks.</p> <p>4. Spatial food distribution did not affect within-group body length variation, but individuals reared under clumped food conditions were smaller. Shoals of the different feeding conditions differed in social behaviour. Shoals of the clumped treatment group showed higher variation in inter-individual distances compared to shoals of the homogeneous treatment group. Furthermore, focal fish of the clumped treatment adjusted their association preference to the position of the groups' largest individual. We did not find significant inbreeding or environment-dependent inbreeding effects regarding growth or social behaviour.</p> <p>5. Our study suggests that a clumped food distribution can impede localisation of food resources and thus growth in juvenile social foragers. Accordingly, in heterogeneous environments, the use of social information may be highly relevant to increase individuals' foraging success potentially explaining orientation on successful foragers, i.e. large individuals. Inter-individual variation in juvenile social behaviour may precede variation in food monopolisation capability and in growth emerging at later life stages.</p>
Figure 2 in A treetop diner: camera trapping reveals novel arboreal foraging by fishing cats on colonial nesting birds in Bangladesh
Figure 2: Photo sequence of the arboreal predatory behaviour of the fishing cat captured on camera traps in northeast Bangladesh arranged in a clockwise sequence. (A–F) The first event on 03 August, 2022. (G–L) The second event on 02 October, 2022 (for descriptions see Table 1).
Figure 1 in A treetop diner: camera trapping reveals novel arboreal foraging by fishing cats on colonial nesting birds in Bangladesh
Figure 1: Location of the bird colony where the arboreal predatory behaviour of the fishing cat was captured on camera traps in northeast Bangladesh. (A) Fishing cat range in Bangladesh. (B) Northeast Bangladesh. (C) The Indian Oak/Hijal tree. Red circles denote the placement of the camera traps. The range map in Bangladesh is adapted from Mukherjee et al. (2016).
Data from: Predatory fish sounds can alter crab foraging behavior and influence bivalve abundance
The risk of predation can have large effects on ecological communities via changes in prey behaviour, morphology and reproduction. Although prey can use a variety of sensory signals to detect predation risk, relatively little is known regarding the effects of predator acoustic cues on prey foraging behaviour. Here we show that an ecologically important marine crab species can detect sound across a range of frequencies, probably in response to particle acceleration. Further, crabs suppress their resource consumption in the presence of experimental acoustic stimuli from multiple predatory fish species, and the sign and strength of this response is similar to that elicited by water-borne chemical cues. When acoustic and chemical cues were combined, consumption differed from expectations based on independent cue effects, suggesting redundancies among cue types. These results highlight that predator acoustic cues may influence prey behaviour across a range of vertebrate and invertebrate taxa, with the potential for cascading effects on resource abundance.
Data from: Resource heterogeneity but not inbreeding affects growth and grouping behaviour in socially foraging juvenile cichlid fish
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Data from: Life at the top: lake ecotype influences the foraging patterns, metabolic costs and life history of an apex fish predator
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Data from: Enhancing insights into foraging specialization in the world’s largest fish using a multi-tissue, multi-isotope approach
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Data from: Local forage fish abundance influences foraging effort and offspring condition in an Endangered marine predator
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Data from: Predatory fish sounds can alter crab foraging behavior and influence bivalve abundance
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Changes in foraging mode caused by a decline in prey size have major bioenergetic consequences for a small pelagic fish
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Figure 3 in Optimal FOraging OF NeOtrOpical Otters (CarnivOra: Mustelidae) in an urban river and predOminance OF generalist and sedentary fish in their diet
Figure 3. Randomized species accumulation curve (Coleman) for fecal samples of Lontra longicaudis collected during the wet and dry seasons in the Santa Lúcia Biological Station (SLBS) between May 2006 and September 2007.
Figure 2 in Optimal FOraging OF NeOtrOpical Otters (CarnivOra: Mustelidae) in an urban river and predOminance OF generalist and sedentary fish in their diet
Figure 2. Stretches of the Timbuí River in the Santa Lúcia Biological Station (SLBS) with environments conducive to the presence of otters: (A) rocky environments; (B) sandbanks covered by vegetation. Images captured on May 27, 2007.
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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.