DOI: 10.5061/dryad.m8s2r36
title: Data from: Context-dependent costs and benefits of a heterospecific nesting association

description: The costs and benefits of interactions among species can vary spatially or
 temporally, making them context-dependent. For example, benefits
 associated with nesting near species that deter predators may give way to
 costs if the association increases the risk of predation during other
 stages of reproduction. We examined the extent to which the costs and
 benefits of heterospecific aggregations between a declining shorebird, the
 Hudsonian Godwit (Limosa haemastica), and a potential protector and
 predator, the Mew Gull (Larus canus), varied with breeding stage.
 Specifically, we assessed the spatial distribution and fate of 43 godwit
 and 262 gull nests in Beluga, Alaska, from 2014 – 2016. We then evaluated
 the effect of habitat and proximity to gulls on daily survival rates of
 120 godwit nests from 2009 – 2016. We also examined the relationship
 between the proximity to gulls and survival of godwit chicks to five days
 old, the period when they are vulnerable to gull predation. Nests of
 godwits and gulls were significantly clustered across the landscape, a
 pattern that habitat heterogeneity failed to explain. Hatching success of
 godwit nests improved with proximity to the gull colony and increasing
 numbers of gull nests within 200m. In contrast, survival of godwit chicks
 to five days improved with increasing distance to the gull colony. The
 costs and benefits that godwits derived from associating with Mew Gulls
 were thus context-dependent, with benefits pre-hatch and costs post-hatch.
 Our results show how spatiotemporal variation in species interactions
 preclude simple generalizations about the nature of their outcomes.
description: Nest Locations for
 Hudsonian Godwits and Mew GullsNest locations (Latitude
 & Longitude, Easting & Northing both given) for two species (SPP:
 Hudsonian Godwit (HUGO) and Mew Gull (MEGU)) from 2009-2016 (godwits) and
 2014-2016 (gulls) in Beluga River, AK. Godwit nest fate (HATCH = nest
 successfully hatched, FAIL = nest did not hatch - usually predated) is
 also included.NorthPlot_Nests_HUGO_MEGU.csvHudsonian Godwit nest survival 2009-2016Hudsonian Godwit nest survival from 2009-2016. Data is organized for analysis in program MARK. Individual covariates: DIST_MEGUCOLONY: distance to the gull colony; DIST_H20: distance to pond; PER_30CM_1M: percent vegetation between 30cm and 1m tall; PER_BARE: percent circle bare ground (e.g., mud, water, or rocks); PER_SEDGE_GRASS: percent circle covered by grass and sedge species; PER_FORB: percent circle covered by herbaceous forb species; NUM_SPECIES: number of plant species within circle. All vegetation metrics taken within a 1m diameter circle-plot at nestHUGO_Nests_09-16_gull_habitat.csvHudsonian Godwit nest survival 2014-2016Hudsonian Godwit nest survival from 2014-2016. Data is organized for analysis in program MARK. Individual covariates: DIST_MEGU: distance to the closest Mew Gull nest; DIST_MEGUCOLONY: distance to the gull colony; DIST_H20: distance to pond; NUM_MEGU_NESTS: number of Mew Gull nests within 200m radius; PER_30CM_1M: percent vegetation between 30cm and 1m tall; PER_BARE: percent circle bare ground (e.g., mud, water, or rocks); PER_SEDGE_GRASS: percent circle covered by grass and sedge species; PER_FORB: percent circle covered by herbaceous forb species; NUM_SPECIES: number of plant species within circle. All vegetation metrics taken within a 1m diameter circle-plot at nestHUGO_Nests_14-16_gull_habitat.csvMoran's I all pointsData for use in Moran's I analysis. For each Hudsonian Godwit nest located between 2014-2016 and 25 associated random points, the locations (Latitude & Longitude, Easting & Northing) of the vegetation survey and the first two principal components (PC1 & PC2) of vegetation metrics (Distance to water, percent cover between 30cm and 1m tall, percent bare ground, percent covered by sedges and grasses, percent covered by herbaceous forbs, and number of plant species).MoransI_allpoints_PCs.csvMoran's I nests onlyData for use in Moran's I analysis. For each Hudsonian Godwit nest located between 2014-2016 only, the locations (Latitude & Longitude, Easting & Northing) of the vegetation survey and the first two principal components (PC1 & PC2) of vegetation metrics (Distance to water, percent cover between 30cm and 1m tall, percent bare ground, percent covered by sedges and grasses, percent covered by herbaceous forbs, and number of plant species).MoransI_nestsonly_PCs.csvHudsonian Godwit Chick SurvivalHudsonian Godwit chick survival from 2014-2016 in Beluga River, Alaska. Data consists of triangulated locations of 29 individuals from 25 broods during the first 5 days post-hatch (period when prone to Mew Gull predation). SURV_D5: survival of chick to day 5. DIST_COLONY: distance of triangulated location of chick to the Mew Gull colony. DIST_MEGU_NEST: distance of triangulated location of chick to the closest Mew Gull nest; NUM_MEGU_NESTS: number of Mew Gull nests within a 200m radius of triangulated location of chick. DIST_POND: distance to edge of closest pond of triangulated location of chick. DIST_NEST_COLONY: distance to the Mew Gull colony of the nest the chick hatched from.HUGO_Chick_gull.csv