Condition-dependent immune response in a migrating shorebird, the common snipe Gallinago gallinago

Bird migration, as an energy-demanding activity, is expected to generate allocation trade-offs between important biological processes, such as immune response. On one hand, long-distance migratory flights may require redirection of resources from immune response and promote temporal immunosuppression. On the other hand, individuals in high body conditions may have the capacity to cope with the costs of migration while maintaining adequate levels of immune activity. Here, we investigated the covariation of immune response and two measures of condition in a short-distance migratory shorebird, the common snipe Gallinago gallinago. We captured and experimentally induced immune response using phytohaemagglutinin (PHA) in 148 snipes during the autumn migration. We found a positive relationship between PHA-induced immune response with indices of body condition reflecting aerobic capacity (total blood haemoglobin concentration) and the level of accumulated energy reserves (size-corrected body m..., , , # Condition-dependent immune response in a migrating shorebird, the common snipe Gallinago gallinago

[https://doi.org/10.5061/dryad.9zw3r22rh](https://doi.org/10.5061/dryad.9zw3r22rh)

## Description of the data and file structure

The data were collected at the Jeziorsko reservoir (51°40′ N, 18°40′ E), central Poland, during two autumn migratory seasons (2018-2019, period 04 August -15 September). Files are stored in Excel file (.xlsx) format.

### Files and variables

#### File: DATA\_SET.xlsx

**Description:** The file contains the results of experiment conducted on 148 common snipe (*Gallinago gallinago*). It includes data on the induced immune responses and body condition indices for each individual.

##### Variables

* N: ordinal number
* Year: year of the sampling procedure
* Day: day of the year
* Bird_ID: individual bird number which is a metal ring number
* Age_class: one of the two possible values: 1- first-year bird; 2- adult bird
* LOG_PHA: log-transformed PHA-induced imm...