Seasonal resighting histories of adult Eurasian spoonbills

The datafile contains seasonal resighting histories of 538 adult Eurasian spoonbills that breed in the Netherlands or Germany and winter in France, Iberia or Mauritania, resighted between October 2005 and September 2012. Resighting periods are defined as October-December and January-March in an individual's wintering area and April-June and July-September in the breeding areas in The Netherlands and Germany. The resighting history of an individual starts with the first resighting as an adult (3rd winter or older) in its wintering region, being France, Iberia or Mauritania (and indicated in the column "group" of the datafile). Further details can be found in the Supplementary Material associated with the manuscript

Regression analyses of the relationship between body components and body mass of <i>piersmai</i> red knots.

<p>Fuel deposition models are described with body mass as the independent variable and different body components as dependent variables, including fat mass (A), total lean dry mass (B), lean dry mass of flight muscles (C), gizzard (D), other nutrient organs (E) and leg muscles (F). Each point represents data from an individual bird. Significant regressions are presented with solid lines and insignificant regressions with dashed lines. The regression models were selected according to AIC_c in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0062551#pone.0062551.s001" target="_blank">Table S1</a>. The regression equations are listed in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0062551#pone.0062551.s003" target="_blank">Table S3</a>.</p

Body mass (mean ± SD) of red knots (<i>Calidris canutus piersmai</i>) captured on different dates.

<p>A total of 486 birds were sampled in 2008–2012 on the coast of the north Yellow Sea during northward migration. The solid line indicates least-square linear regression of total birds and the dashed lines indicate the linear regression of the females (red) and the males (blue).</p

Primary data used in Mathot, Dekinga and Piersma, Functional Ecology

The attached file includes three worksheets: 1) gizzard mass data, 2) ad libitum foraging trial data, and 3) diet choice trials. Complete descriptions of all column headings are provided on the first tab of the excel file. For details of the methodology, please refer to the original publication in Functional Ecology

Primary molt start and end date (A, B), and molt duration (C), in free-living and captive red knots.

<p>Symbols: closed symbols, males; open symbols, females. Group abbreviations: SYM, second-year males; SYF, second-year females; FAdM, free-living adult males; FAdF, free-living adult females; CAdM, captive adult males; CAdF, captive adult females.</p

The average temporal distribution of primary molt in free-living adult and second-year red knots, and captive adult red knots (sexes combined, grey blocks).

<p>The dashed vertical grey lines indicate when the knots had completed growth of primary 5. Also plotted are the estimated weekly maintenance costs for a red knot living in the Wadden Sea, calculated using the model of <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0053890#pone.0053890-Wiersma1" target="_blank">[63]</a> (equation 5; using mudflat conductances) from daily wind, ambient temperature and solar radiation data obtained over the same period as the molt data (1998–2006; data from the Royal Netherlands Meteorological Institute (KNMI) weather station at Hoorn on the island Terschelling in the Dutch Wadden Sea, 52°23′N 5°21′E). Note that basal and thermoregulatory costs are included in maintenance costs, but molt costs (feather synthesis and increased thermoregulation) are not. Maintenance costs are indicated with circles; open circles indicate the period during which adult red knots are migrating or in the breeding areas <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0053890#pone.0053890-Wiersma1" target="_blank">[63]</a>. In addition, daylength in the Wadden Sea is given (solid line, right Y-axis, data from KNMI, 2006). Arrows indicate the start of the rapid increase in number of peregrines in the Wadden Sea (P; <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0053890#pone.0053890-vandenHout2" target="_blank">[54]</a>), and when the diet of free-living knots changes from shellfish to less profitable mudsnails (D; <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0053890#pone.0053890-Piersma6" target="_blank">[56]</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0053890#pone.0053890-vanGils1" target="_blank">[58]</a>).</p

Mean bill length of bar-tailed godwits (Limosa lapponica)

Mean bill length of bar-tailed godwits (Limosa lapponica) captured and/or resighted in the Dutch Wadden Sea and the Wash (UK)

Percentage of energy (AFDM) in diet

Percentage of energy content (AFDM g) in diet of bar-tailed godwits (Limosa lapponica) per month based on observations and dropping analysis. Dataset includes mean burying depth of lugworms (cm), mean bill length (mm) of Dutch Wadden Sea birds only and the mean PEIR (predicted energy intake rate)

Bill lengths of first and consequent catches

Bill lengths of bar-tailed godwits (Limosa lapponica) at time of first capture and bill lenghts of birds recaptured (> 1 yr)

Predicted Energy Intake Rate (PEIR)

Prey burying depth per month and year, energy and density per m2, the predicted a (exp.a; area of discovery) and predicted handling time (Th) and the intake rate (PEIR)