Data from: Understanding spatial distributions: negative density-dependence in prey causes predators to trade-off prey quantity with quality

Bijleveld AI, MacCurdy RB, Chan Y, Penning E, Gabrielson RM, Cluderay J, Spaulding EL, Dekinga A, Holthuijsen S, ten Horn J, Brugge M, van Gils JA, Winkler DW, Piersma T

Date Published: August 4, 2016

DOI: http://dx.doi.org/10.5061/dryad.d75hq

 

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Title spatial raster with cockle densities corresponding to Fig3A
Downloaded 7 times
Description The coordinate reference system is EPSG:32631 - WGS 84 / UTM zone 31N, and cockle density is presented in numbers per square meter.
Download resource_landscape-Fig3A_cockle_density.tif (827.4 Kb)
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Title Spatial raster with relative AFDMflesh corresponding to Fig3B
Downloaded 6 times
Description The coordinate reference system is EPSG:32631 - WGS 84 / UTM zone 31N. Relative AFDMflesh is presented as the ratio of AFDMflesh to average AFDMflesh for cockles of identical length (see main article).
Download resource_landscape-Fig3B_relative_AFDMflesh.tif (784.8 Kb)
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Title spatial raster with predicted intake rates corresponding to Fig3C
Downloaded 3 times
Description The coordinate reference system is EPSG:32631 - WGS 84 / UTM zone 31N, and predicted intake rates are presented in mg AFDMflesh per second. These intake rates correspond to foragers without a digestive constraint.
Download resource_landscape-Fig3C_IR.tif (821.4 Kb)
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Title spatial raster with predicted intake rates for knots with an average gizzard mass corresponding to Fig3D
Downloaded 4 times
Description The coordinate reference system is EPSG:32631 - WGS 84 / UTM zone 31N, and predicted intake rates are presented in mg AFDMflesh per second. These intake rates are for digestively constraint red knots with an average gizzard mass (7g).
Download resource_landscape-Fig3D_IR_avg_gizzard_mass.tif (818.0 Kb)
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Title Spatial raster with prey quality that is used to calculate the digestive constraint
Downloaded 5 times
Description The coordinate reference system is EPSG:32631 - WGS 84 / UTM zone 31N, and prey quality is presented as the ratio of AFDMflesh to DMshell. A red knot's digestive constraint can be calculated as q × 0.05 × G^2, where q is prey quality and G is gizzard mass (see main article).
Download resource_landscape-prey_quality_for_calcu...nt.tif (786.6 Kb)
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Title Data file for resource selection analyses corresponding to Fig. 4 and Table S2 and S3
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Description This file contains data for the resource selection analyses. Each row represents a used or available residence patch. The different columns are: tagID (the bird's tag number), gizzard_mass (the measured gizzard mass in g), X (X-coordinate of residence patch in m), Y (Y-coordinate of residence patch in m), RT (duration of residence patch in h), present (1 indicates a used residence patch, and 0 indicates an available residence patch), density (cockle density at these coordinates in numbers per square meter), AFDMflesh (relative AFDMflesh at these coordinates), IR (predicted intake rate at these coordinates in mg AFDMflesh per second), IR_avg_gizzard (predicted intake rate at these coordinates with an average gizzard mass in mg AFDMflesh per second), IR_ind_gizzard (standardised predicted intake rates at these coordinates given an individual's measured gizzard mass), and weights (statistical weight in resource selection model).
Download resource_selection_of_knots.csv (775.9 Kb)
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Title Data for the analyses of density dependence in flesh and shell mass of cockles corresponding to Fig. 2A and Table S1
Downloaded 2 times
Description This file contains data for the analyses of density dependence in flesh and shell mass of cockles. Each row represents a measurement of relative flesh or shell mass. The different columns are: sampling_station (sampling station of cockle measurements), density (cockle density at this sampling station), relative_AFDMflesh (proportional deviation in AFDMflesh compared to the average of cockles with identical length), relative_DMshell (proportional deviation in DMshell compared to the average of cockles with identical length), length (length of the cockle in mm).
Download density_dependence_in_cockles.csv (25.52 Kb)
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When using this data, please cite the original publication:

Bijleveld AI, MacCurdy RB, Chan Y, Penning E, Gabrielson RM, Cluderay J, Spaulding EL, Dekinga A, Holthuijsen S, ten Horn J, Brugge M, van Gils JA, Winkler DW, Piersma T (2016) Understanding spatial distributions: negative density-dependence in prey causes predators to trade-off prey quantity with quality. Proceedings of the Royal Society B 283(1828): 20151557. http://dx.doi.org/10.1098/rspb.2015.1557

Additionally, please cite the Dryad data package:

Bijleveld AI, MacCurdy RB, Chan Y, Penning E, Gabrielson RM, Cluderay J, Spaulding EL, Dekinga A, Holthuijsen S, ten Horn J, Brugge M, van Gils JA, Winkler DW, Piersma T (2016) Data from: Understanding spatial distributions: negative density-dependence in prey causes predators to trade-off prey quantity with quality. Dryad Digital Repository. http://dx.doi.org/10.5061/dryad.d75hq
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