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48 results for “Forage fish”
Tropical range extending herbivorous fishes gain foraging benefits by shoaling with native temperate species
<p>Data1.csv contains the data to analyze the abundance of fish herbivore individuals as a function of the species and the type of shoal. </p> <p>Data2.xlsx contains the data to analyze the foraging activity of the herbivorous fish found in our study. We explored the relationship between bite rates per fish min-1 and the species, shoal type and shoal size. </p> <p>Data3.xlslx contains the data to analyze the shoaling configurations based on species origin. </p> <p>Minguito-Frutos_etal.R contains the R reproducible code to run all the analyses carried out in this study. </p> <p>Species_coocurrence_based_associations.R contains the reproducible R code to run the analyses to explore the strength of mixed-species associations between herbivorous fish. </p> <p>-------------------------------------------------------------------------------------------------------------------------------------------</p> <p>Data1.csv, Data2.xlsx, Data3.xlslx, and Minguito-Frutos_etal.R contains the data and code used before submitting this work. </p> <p>-------------------------------------------------------------------------------------------------------------------------------------------<br><br>Minguito_Frutos_etal2025_SR_Rscript, Data_Rev_SR, and Data2_Rev_SR contain the data and code derived from the last submission to Scientific Reports. In this latest version, we modified our analyses of fish foraging activity that now evaluate: (i) the frequency and size of mixed-species shoals based on the origin of the species examined (using data in Data2_Rev_SR), (ii) the strength of pair-wise associations between native and range-expanding species (using Species_coocurrence_based_associations.R), and (iii) how the foraging activity of native and range-extending fishes was shaped by the composition and size of the shoals (using data in Data_Rev_SR). </p>
Data from: The role of fish predators and their foraging traits in shaping zooplankton community structure
<p><span>Differentiation of foraging traits among predator populations may help explain observed variation in the structure of prey communities. However, few studies have investigated the phenotypic effects of predators on their prey in natural communities. Here, we use a comparative analysis of 78 Greenlandic lakes to examine how foraging trait variation among threespine stickleback populations can help explain variation in zooplankton community composition among lakes. We find that landscape-scale variation in zooplankton composition was jointly explained by lake properties, such as size and water chemistry, and the presence and absence of both stickleback and arctic char. </span><span>Additional variation in zooplankton community structure can be explained by stickleback jaw protrusion, a trait with known utility for foraging on zooplankton, but only in lakes where stickleback co-occur with arctic char. Overall, our results illustrate how trait variation of consumers, alongside other ecosystem properties, can influence the composition of prey communities in nature.</span></p>
Figure 4 in Optimal FOraging OF NeOtrOpical Otters (CarnivOra: Mustelidae) in an urban river and predOminance OF generalist and sedentary fish in their diet
Figure 4. Results of the Ivlev's selectivity index for the dataset from: (A) May 2006 to September 2007; (B) September 2006 to January 2007 (wet season); (C) February to August 2007 (dry season).
Fig. 2 in Habitat simplification affects nuclear-follower foraging association among stream fishes
Fig. 2. General view of the altered (a) and unaltered (b) sites in the córrego Olho d'Água, Central-West Brazil. Photos: Renato M. Romero and Fabrício B. Teresa.
Fig. 1 in Habitat simplification affects nuclear-follower foraging association among stream fishes
Fig. 1. Location of the study area, indicating the córrego Olho d'Água in South America (black dot).
Fig. 1 in Turtle cleaners: reef fishes foraging on epibionts of sea turtles in the tropical Southwestern Atlantic, with a summary of this association type
Fig. 1. Reef fishes cleaning sea turtles' hard and soft parts in the Southwestern Atlantic. A porkfish (Anisotremus virginicus) and a group of blue tangs (Acanthurus coeruleus) feed on epibionts on the shell of a moving hawksbill turtle (Eretmochelys imbricata); a barely visible doctorfish (Acanthurus chirurgus) nibbles at the posterior portion of the turtle's shell, and two blue tangs nibble at the left hind limb (a). Photo by M. Granville. One Zelinda's parrotfish (Scarus zelindae) and three blue tangs feed on algae growth on the shell of a male loggerhead turtle (Caretta caretta) near a shipwreck; two Spanish hogfishes (Bodianus rufus) also inspect the turtle (b). Photo by Z. Matheus. Four Spanish hogfish inspect and forage on epibionts on the shell of the same loggerhead turtle; one blue tang and one Zelinda's parrotfish also "escort" the slowly moving turtle (c). Photo by Z. Matheus. A green turtle (Chelonia mydas) remain motionless on the bottom, while a Brazilian blenny (Ophioblennius trinitatis) forages on algae growth on the left lateral portion of the shell; a few smallmouth grunts (Haemulon chrysargyreum) also capitalize upon this situation, and nibble at the turtle's shell (d). Photo by C. Sazima. A sergeant major (Abudefduf saxatilis) nibbles at an algae patch on the anterior part of the shell of a posing and hovering green turtle (e). Photo by Z. Matheus. The herbivorous Rocas damselfish (Stegastes rocasensis) nibbles at the right hind limb of a green turtle posing near algae turfs tended by this damselfish (f). Photo by Z. Matheus.
Fig. 1. A in Scientific Note The more stirring the better: cichlid fishes associate with foraging potamotrygonid rays
Fig. 1. A freshwater ray (Potamotrygon motoro) forages with use of "undulate the disc and stir substrate" tactic. Note fine clouds of sediment adjacent to the ray.
Fig. 2. Association between a in Scientific Note The more stirring the better: cichlid fishes associate with foraging potamotrygonid rays
Fig. 2. Association between a foraging freshwater ray (Potamotrygon falkneri) and two species of cichlid fishes (Crenicichla britskii on the left and Geophagus proximus on the right). The ray settles close to the bottom, begins to undulate the disc and stir the substrate, which cause the cichlid to approach (a); as the ray proceeds foraging and forms a fine sediment cloud, the cichlids hover head-down close to the disc and watches potential prey to be uncovered by the ray's movements (b).
Data from: Changes in movement characteristics in response to private and social information acquisition of socially foraging fish
<p>To overcome the cost of competition resulting from foraging socially, individuals may balance their use of private (i.e. acquired from personal sampling) and social (i.e. acquired by watching other individuals) information to adjust their foraging strategy accordingly. Reliability of private information about environmental characteristics, such as the spatial distribution of prey, is thus likely to affect individual movement and social interactions. We aimed to investigate how movement characteristics of foraging individuals changed as they acquired reliable information about the spatial occurrence of prey in a foraging context. We allowed guppies (<em>Poecilia reticulata</em>) to develop the reliability of their private knowledge about prey spatial occurrence by repeatedly testing shoals in a foraging task under three experimental distributions of prey: 1) aggregated prey forming three patches located in fixed locations, 2) scattered distribution of prey with random locations, or 3) no prey (used as control). Using individual time series of spatial coordinates, we computed a suite of movement variables reflecting search effort, social proximity and locomotion characteristics during foraging, to examine changes occurring over repeated trials. Over time, individuals foraging on either scattered or aggregated prey travelled greater distances, showed an increasing distance to their closest neighbour and became more stochastic in their acceleration profile, compared to control individuals. We found that behaviour changed as private information increased over time, with a behavioural shift and an increase of collective foraging efficiency occurring on the third testing day. Social proximity was the major predictor of foraging success in the absence of prior foraging information, while search effort became the most important predictors of foraging success as information increased. In conclusion, we show that individual movement patterns changed as they acquired private information. Contrary to our predictions, the spatial distribution of prey did not affect any of the movement variables of interest.</p>
Stable isotopes reveal intertidal fish and crabs use shellfish farms as foraging habitat in Puget Sound, Washington
<p>This is the dataset used for my second thesis chapter. The data consists of carbon and nitrogen stable isotope data collected in 3 locations in North Puget Sound in 2020-2022. Locations are Samish Bay, Padilla Bay, and Drayton Harbor. Stable isotope data is presented in standard permil format, with values referenced from the Vienna Pee Dee Belemnite and atmospheric nitrogen standards, which are the international reference standards commonly used as isotopic references for carbon and nitrogen. </p> <p>Primary productivity samples, snails, oysters, and clams were collected by hand at low tide. Fish and crabs were collected via beach seine and crab pots deployed concurrently with seining. </p> <p>Samples were collected either within bivalve farms, or within eelgrass meadow reference sites outside of farmed areas.</p> <p>All code and data necessary to reproduce the analysis is available via my Github page. </p> <p>The metadata spreadsheet contains descriptions of each column in the datasheet.</p> <p>For more information, see my chapter 2 thesis.</p>
Data from: The role of fish predators and their foraging traits in shaping zooplankton community structure
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Data from: Changes in movement characteristics in response to private and social information acquisition of socially foraging fish
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Data from: Diet reveals links between morphology and foraging in a cryptic temperate reef fish
Predators select prey so as to maximize energy and minimize manipulation time. In order to reduce prey detection and handling time, individuals must actively select their foraging space (microhabitat) and populations exhibit morphologies that are best suited for capturing locally available prey. We explored how variation in diet correlates with habitat type, and how these factors influence key morphological structures (mouth gape, eye diameter, fin length, fin area, and pectoral fin ratio) in a common microcarnivorous cryptic reef fish species, the triplefin Helcogrammoides cunninghami. In a mensurative experiment carried out at six kelp-dominated sites, we observed considerable differences in diet along 400 km of the Chilean coast coincident with variation in habitat availability and prey distributions. Triplefins preferred a single prey type (bivalves or barnacles) at northern sites, coincident with a low diversity of foraging habitats. In contrast, southern sites presented varied and heterogeneous habitats, where triplefin diets were more diverse and included amphipods, decapods, and cumaceans. Allometry-corrected results indicated that some morphological structures were consistently correlated with different prey items. Specifically, large mouth gape was associated with the capture of highly mobile prey such as decapods, while small mouth gape was more associated with cumaceans and copepods. In contrast, triplefins that capture sessile prey such as hydroids tend to have larger eyes. Therefore, morphological structures co-vary with habitat selection and prey usage in this species. Our study shows how an abundant generalist reef fish exhibits variable feeding morphologies in response to the distribution of potential habitats and prey throughout its range.
Data for: Long-wavelength-sensitive (lws) opsin gene expression, foraging and visual communication in coral reef fishes
<p>Coral reef fishes are diverse in ecology and behaviour and show remarkable colour variability. Investigating the visual pigment gene (opsin) expression in these fishes makes it possible to associate their visual genotype and phenotype (spectral sensitivities) to visual tasks, such as feeding strategy or conspecific detection. By studying all major damselfish clades (Pomacentridae) and representatives from five other coral reef fish families, we show that the long-wavelength-sensitive (<em>lws</em>) opsin is highly expressed in algivorous and less or not expressed in zooplanktivorous species. <em>Lws</em> is also upregulated in species with orange/red colours (reflectance >520 nm) and expression is highest in orange/red-coloured algivores. Visual models from the perspective of a typical damselfish indicate that sensitivity to longer wavelengths does enhance the ability to detect the red to far-red component of algae and orange/red-coloured conspecifics, possibly enabling social signalling. Character state reconstructions indicate that in the early evolutionary history of damselfishes, there was no <em>lws</em> expression and no orange/red coloration. Omnivory was most often the dominant state. Although herbivory was sometimes dominant, zooplanktivory was never dominant. Sensitivity to long wavelength (increased <em>lws</em> expression) only emerged in association with algivory but never with zooplanktivory. Higher <em>lws</em> expression is also exploited by social signalling in orange/red, which emerged after the transition to algivory. Although the relative timing of traits may deviate by different reconstructions and alternative explanations are possible, our results are consistent with sensory bias whereby social signals evolve as a correlated response to natural selection on sensory system properties in other contexts.</p>
Shipping alters the movement and behavior of Arctic cod (B. saida), a keystone forage fish in Arctic marine ecosystems
<p>Dataset for Ivanova et al. (2019): Shipping alters the movement and behavior of Arctic cod (B. saida), a keystone forage fish in Arctic marine ecosystems. Includes: arctic cod tagging metadata and vps locations files, and vessel activity in Resolute Bay, Nunavut, Canada for 2012. </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>
Shellfish aquaculture farms as foraging habitat for nearshore fishes and crabs
<p>This is the dataset used for the analysis in our paper. The file contains species counts and behavior classifications of nearshore fish and crabs taken from time-lapse underwater video. Also included are habitat transect data from each site. Presence/absence of zostera marina and zostera japonica eelgrass, algae, as well as eelgrass metrics were quantified in the transects.</p> <p>The metadata spreadsheet contains descriptions of each column in the datasheet.</p> <p>This data was collected at shellfish aquaculture farm sites across Puget Sound, Washington, USA in 2017, 2018, and 2019 using underwater timelapse video cameras and habitat transects.</p> <p>Transects were done with 1/4 meter^2 quadrat divided into 25 10x10cm^2 squares, each quadrat was measured 5 times along a 30 meter line parallel to shore.</p> <p>Video was recorded in 2 minute lengths every 10 minutes starting 1 hour before high tide, going to 1 hour after high tide, using cameras positioned approximately 18 inches off the substrate. PVC stakes were used to mark a 1 meter square of camera visibility and organisms observed within that 1 meter square were recorded. </p> <p>For more information, see my chapter 1 thesis.</p>
Data from: Diet reveals links between morphology and foraging in a cryptic temperate reef fish
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Global warming affects foraging efficiency of fish by influencing mutual interference
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Data from: The interplay of satiation and temptation affects cleaner fish foraging behavior and service quality
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